/* ============================================================================
   CoCanvas 智能协同画布 —— 全局样式（设计系统）
   ----------------------------------------------------------------------------
   设计语言：
     · 深色玻璃拟态（glassmorphism）+ 蓝紫渐变主色
     · 统一 CSS 变量：颜色 / 圆角 / 阴影，便于整体换肤
     · 交互动效：hover 抬升、选中辉光、过渡 0.2s
   ============================================================================ */

:root {
  /* 背景层级 */
  --bg-deep: #0d0f21;                /* 页面最深背景 */
  --bg: #14162e;                     /* 页面背景 */
  --bg-soft: #1a1d3a;                /* 面板背景 */
  --bg-elev: rgba(255, 255, 255, 0.06);   /* 浮起元素 */
  --bg-elev-hover: rgba(255, 255, 255, 0.11);
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);

  /* 主色：蓝紫渐变 */
  --accent: #6c7cff;
  --accent-2: #a855f7;
  --accent-grad: linear-gradient(135deg, #6c7cff 0%, #a855f7 100%);
  --accent-soft: rgba(108, 124, 255, 0.16);
  --accent-glow: 0 4px 18px rgba(108, 124, 255, 0.35);

  /* 文本 */
  --text: #eef0ff;
  --text-dim: rgba(238, 240, 255, 0.55);
  --text-faint: rgba(238, 240, 255, 0.32);

  /* 状态色 */
  --green: #34d399;
  --red: #f87171;
  --amber: #fbbf24;

  /* 圆角与阴影 */
  --r-sm: 8px;
  --r: 12px;
  --r-lg: 16px;
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.45);
  --shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.3);
}

* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; -webkit-user-select: none; user-select: none; }
.hidden { display: none !important; }
/* 只对视觉隐藏、仍供读屏器读取的辅助文本。 */
.sr-only { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
html, body { width: 100%; height: 100%; overscroll-behavior: none; }
#app { width:100%; height:100%; min-height:0; overflow:hidden; }
body {
  font-family: -apple-system, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg-deep);
  color: var(--text);
  overflow: hidden;
}

/* 统一滚动条：细窄半透明 */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.14); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.26); }
::-webkit-scrollbar-track { background: transparent; }

/* 焦点可见性（键盘可达性） */
button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ============================================================================
   登录页 —— 动态渐变背景 + 玻璃卡片
   ============================================================================ */
#loginPage {
  position: relative;
  display: flex; align-items: center; justify-content: center;
  height: 100vh; height: 100dvh; min-height: 0; padding:20px 0;
  background:
    linear-gradient(rgba(125,145,205,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(125,145,205,.045) 1px,transparent 1px),
    radial-gradient(900px 540px at 14% 2%,rgba(94,234,212,.09),transparent 62%),
    radial-gradient(780px 520px at 92% 100%,rgba(129,140,248,.14),transparent 66%),
    #0a1020;
  background-size:28px 28px,28px 28px,auto,auto,auto;
  overflow-x: hidden; overflow-y: auto; overscroll-behavior-y: contain;
  -webkit-overflow-scrolling: touch;
}
/* 背景光斑：营造柔和氛围（纯 CSS，无外部资源） */
#loginPage::before, #loginPage::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.55;
  pointer-events: none;
}
#loginPage::before {
  width: 420px; height: 420px;
  background: radial-gradient(circle, rgba(108, 124, 255, 0.55), transparent 70%);
  top: -120px; left: -80px;
  animation: floatGlow 9s ease-in-out infinite alternate;
}
#loginPage::after {
  width: 380px; height: 380px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.5), transparent 70%);
  bottom: -100px; right: -60px;
  animation: floatGlow 11s ease-in-out infinite alternate-reverse;
}
@keyframes floatGlow {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(46px, 30px) scale(1.14); }
}

.login-container {
  position: relative;
  width: min(92%, 430px); max-width: 430px;
  flex:0 0 auto; margin:auto 0;
  padding: 40px 38px 34px;
  background: linear-gradient(155deg,rgba(22,31,55,.91),rgba(12,18,36,.94));
  border-radius: 24px;
  backdrop-filter: blur(24px) saturate(130%);
  -webkit-backdrop-filter: blur(24px) saturate(130%);
  border: 1px solid rgba(188,201,255,.16);
  box-shadow: 0 32px 90px rgba(1,5,18,.48),inset 0 1px rgba(255,255,255,.06);
}
.logo-area { text-align: center; margin-bottom: 27px; }
.logo-icon {
  width:60px; height:60px; margin:0 auto 15px;
  display:block; animation:logoBounce 5s ease-in-out infinite;
  filter:drop-shadow(0 14px 26px rgba(35,52,103,.42));
}
.logo-icon img { width:100%; height:100%; display:block; }
@keyframes logoBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}
.app-title {
  font-size: 29px; font-weight: 760; color: #fff; letter-spacing:-.8px;
  background: linear-gradient(120deg, #fff 30%, #b9c3ff 70%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.app-subtitle { margin-top:4px; color:#cbd5ea; font-size:12px; font-weight:650; letter-spacing:2px; }
.login-value-line { margin-top:9px; color:var(--text-faint); font-size:11px; line-height:1.55; }

.login-tabs { display: flex; gap: 4px; margin-bottom: 22px; background: rgba(0, 0, 0, 0.28); border-radius: 10px; padding: 4px; }
.tab-btn {
  flex: 1; padding: 10px; background: transparent; border: none;
  color: var(--text-dim); border-radius: 8px; cursor: pointer;
  font-size: 15px; font-weight: 500; transition: all 0.2s;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active { background: var(--accent-grad); color: #fff; box-shadow: var(--accent-glow); }

.login-form { display: flex; flex-direction: column; gap: 15px; }
.login-form.hidden { display: none; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 12.5px; color: var(--text-dim); padding-left: 2px; }
.form-group input {
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--border);
  border-radius: 11px;
  color: #fff; font-size: 15px; outline: none;
  transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
}
.form-group input:focus { border-color: var(--accent); background: rgba(108, 124, 255, 0.08); box-shadow: 0 0 0 3px rgba(108, 124, 255, 0.18); }
.submit-btn {
  padding: 14px; background: var(--accent-grad); border: none; border-radius: 11px;
  color: #fff; font-size: 16px; font-weight: 600; cursor: pointer;
  transition: transform 0.18s, box-shadow 0.18s;
  box-shadow: 0 6px 18px rgba(108, 124, 255, 0.28);
}
.submit-btn:hover { transform: translateY(-2px); box-shadow: 0 9px 24px rgba(108, 124, 255, 0.42); }
.submit-btn:active { transform: translateY(0); }
.error-msg { color: var(--red); font-size: 13px; text-align: center; min-height: 20px; }

/* ---- 服务器状态栏 & 配置弹窗 ---- */
.server-bar {
  display: flex; align-items: center; gap: 8px; margin-bottom: 20px;
  padding: 9px 13px; background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border); border-radius: 10px; font-size: 12px;
}
.server-status-dot { width: 9px; height: 9px; border-radius: 50%; background: #777; flex-shrink: 0; transition: all 0.3s; }
.server-status-dot.online { background: var(--green); box-shadow: 0 0 8px var(--green); }
.server-status-dot.offline { background: var(--red); box-shadow: 0 0 8px rgba(248, 113, 113, 0.5); }
.server-status-dot.checking { background: var(--amber); animation: pulse 1s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.35; } }
.server-status-text { flex: 1; color: var(--text-dim); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.server-setting-btn {
  width: 30px; height: 30px; background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text-dim); cursor: pointer; font-size: 14px; transition: all 0.2s;
}
.server-setting-btn:hover { background: var(--bg-elev-hover); color: #fff; transform: rotate(30deg); }

.server-modal { position: fixed; inset: 0; background: rgba(5, 6, 15, 0.72); backdrop-filter: blur(6px); display: flex; align-items: center; justify-content: center; z-index: 1000; padding: 20px; }
.server-modal.hidden { display: none; }
.server-modal-box {
  position: relative; width: 100%; max-width: 380px; padding: 28px 24px;
  background: linear-gradient(160deg, #232750, #1a1d3a);
  border-radius: var(--r-lg); border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-lg);
  animation: modalIn 0.22s ease;
}
@keyframes modalIn { from { opacity: 0; transform: translateY(14px) scale(0.98); } to { opacity: 1; transform: none; } }
.server-modal-title { font-size: 18px; font-weight: 600; color: #fff; margin-bottom: 8px; }
.server-modal-desc { font-size: 12px; color: var(--text-dim); margin-bottom: 20px; line-height: 1.6; }
.server-modal-actions { display: flex; gap: 8px; margin-top: 16px; }
.server-modal-btn { flex: 1; padding: 11px; border: none; border-radius: 9px; cursor: pointer; font-size: 14px; font-weight: 500; transition: all 0.2s; }
.server-modal-btn.primary { background: var(--accent-grad); color: #fff; box-shadow: 0 4px 14px rgba(108, 124, 255, 0.3); }
.server-modal-btn.secondary { background: var(--bg-elev); color: var(--text-dim); }
.server-modal-btn:hover { transform: translateY(-1px); filter: brightness(1.12); }
.server-modal-close {
  position: absolute; top: 12px; right: 14px; width: 28px; height: 28px;
  background: transparent; border: none; color: var(--text-faint);
  font-size: 22px; cursor: pointer; line-height: 1; transition: color 0.2s;
}
.server-modal-close:hover { color: #fff; }
.server-test-result { font-size: 12px; min-height: 18px; margin-top: 8px; }
.server-test-result.ok { color: var(--green); }
.server-test-result.err { color: var(--red); }

/* ============================================================================
   仪表盘
   ============================================================================ */
#dashboardPage {
  display:flex; flex-direction:column;
  height:100vh; height:100dvh; min-height:0; overflow:hidden;
  background:
    radial-gradient(600px 300px at 85% -5%, rgba(168, 85, 247, 0.16), transparent 70%),
    radial-gradient(500px 280px at 0% 0%, rgba(108, 124, 255, 0.16), transparent 70%),
    var(--bg-deep);
}
.dashboard-header {
  flex:0 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  min-height:70px; padding: 13px 24px;
  background: rgba(12,18,36,.78);
  backdrop-filter:blur(18px) saturate(125%); -webkit-backdrop-filter:blur(18px) saturate(125%);
  border-bottom: 1px solid var(--border);
}
.user-info { display: flex; align-items: center; gap: 13px; }
.avatar {
  width: 46px; height: 46px;
  background: var(--accent-grad); border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 19px; font-weight: 700;
  box-shadow: var(--accent-glow);
}
.user-name { font-size: 16px; font-weight: 600; color: #fff; }
.user-label { font-size: 12px; color: var(--text-faint); margin-top: 2px; }
.logout-btn {
  width: 42px; height: 42px; background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: 12px; color: var(--text-dim); cursor: pointer; font-size: 18px; transition: all 0.2s;
}
.logout-btn:hover { background: rgba(248, 113, 113, 0.15); border-color: rgba(248, 113, 113, 0.35); color: #fff; }

.dashboard-main {
  min-height:0; flex:1; padding:24px 22px 110px;
  overflow-x:hidden; overflow-y:auto; overscroll-behavior-y:contain;
  -webkit-overflow-scrolling:touch;
}
.empty-state { display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 58vh; text-align: center; }
.empty-icon {
  width: 128px; height: 108px; margin-bottom: 26px;
  padding: 18px; border-radius: 24px;
  background: var(--bg-elev); border: 1px dashed var(--border-strong);
}
.empty-svg { width: 100%; height: 100%; }
.empty-title { font-size: 20px; color: var(--text-dim); margin-bottom: 8px; }
.empty-desc { font-size: 14px; color: var(--text-faint); margin-bottom: 30px; }
.btn-primary {
  padding: 14px 42px; background: var(--accent-grad); border: none; border-radius: 14px;
  color: #fff; font-size: 16px; font-weight: 600; cursor: pointer;
  box-shadow: 0 8px 22px rgba(108, 124, 255, 0.35); transition: all 0.2s;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(108, 124, 255, 0.5); }
.btn-primary:active { transform: translateY(0); }

.records-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(168px, 1fr)); gap: 18px; }
.record-card {
  position: relative;
  background: linear-gradient(170deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.03));
  border: 1px solid var(--border); border-radius: var(--r-lg);
  overflow: hidden; cursor: pointer;
  transition: transform 0.22s, box-shadow 0.22s, border-color 0.22s;
}
.record-delete {
  position: absolute; top: 8px; right: 8px; z-index: 2;
  width: 28px; height: 28px; border-radius: 9px;
  color: rgba(255,255,255,0.78); background: rgba(12,14,30,0.72);
  border: 1px solid rgba(255,255,255,0.14); cursor: pointer; font-size: 18px;
  opacity: 0; transition: opacity 0.18s, background 0.18s;
}
.record-card:hover .record-delete, .record-delete:focus-visible { opacity: 1; }
.record-delete:hover { color: #fff; background: rgba(239,68,68,0.88); }
@media (hover: none), (pointer: coarse) { .record-delete { opacity: 1; } }
.record-card:hover { transform: translateY(-4px); border-color: rgba(108, 124, 255, 0.45); box-shadow: var(--shadow-lg); }
.record-open { width:100%; display:block; padding:0; color:inherit; background:transparent; border:0; cursor:pointer; font:inherit; text-align:left; }
.record-open:focus-visible { outline:3px solid rgba(108,124,255,.42); outline-offset:-3px; border-radius:inherit; }
/* 历史作品把“画布规格”和“像素”分行展示，避免 A4 毫米规格被无单位数字淹没。 */
.record-canvas-meta { display:grid; gap:3px; margin:6px 0; color:var(--text-dim); font-size:11px; line-height:1.35; }
.record-thumb {
  aspect-ratio: 1; display: flex; align-items: center; justify-content: center; font-size: 44px;
  background-size: cover;
  border-bottom: 1px solid var(--border);
}
.record-info { display:block; padding: 13px 14px; }
.record-title { display:block; font-size: 14px; font-weight: 600; color: #fff; margin-bottom: 5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.record-meta { font-size: 12px; color: var(--text-faint); }
.record-info .record-meta { display:block; }

/* ---- 底部导航 ---- */
.bottom-nav {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 50;
  display: flex; justify-content: space-around; align-items: center;
  padding: 10px 0 22px;
  background: rgba(13, 15, 33, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-top: 1px solid var(--border);
}
.nav-item { display: flex; flex-direction: column; align-items: center; gap: 4px; background: transparent; border: none; color: var(--text-faint); cursor: pointer; padding: 8px 22px; transition: color 0.2s; }
.nav-item.active { color: var(--accent); }
.nav-icon { font-size: 22px; }
.nav-label { font-size: 11px; }
.nav-center {
  margin-top: -32px; width: 66px; height: 66px;
  background: var(--accent-grad); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: #fff; border: 4px solid var(--bg-deep);
  box-shadow: 0 6px 24px rgba(108, 124, 255, 0.5);
  transition: transform 0.2s, box-shadow 0.2s;
}
.nav-center:hover { transform: scale(1.07); box-shadow: 0 9px 30px rgba(108, 124, 255, 0.65); }
.nav-plus { font-size: 32px; font-weight: 300; line-height: 1; }

/* ============================================================================
   创建页
   ============================================================================ */
#createPage {
  display:flex; flex-direction:column;
  height:100vh; height:100dvh; min-height:0; overflow:hidden;
  background:
    radial-gradient(560px 300px at 100% 0%, rgba(108, 124, 255, 0.14), transparent 70%),
    var(--bg-deep);
}
.create-header { flex:0 0 auto; display:flex; align-items:center; padding:16px 20px; gap:12px; border-bottom:1px solid var(--border); }
.back-btn {
  width: 38px; height: 38px; background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: 11px; color: #fff; font-size: 20px; cursor: pointer; transition: all 0.2s;
}
.back-btn:hover { background: var(--bg-elev-hover); transform: translateX(-2px); }
.create-header h1 { font-size: 18px; font-weight: 600; color: #fff; }
.create-header p { margin-top:3px; color:var(--text-faint); font-size:11px; line-height:1.4; }
.header-spacer { flex: 1; }
.create-main {
  min-height:0; flex:1; padding:0 20px 120px;
  overflow-x:hidden; overflow-y:auto; overscroll-behavior-y:contain;
  -webkit-overflow-scrolling:touch;
}
.section-title { font-size: 15px; font-weight: 600; color: var(--text-dim); margin: 26px 0 14px; letter-spacing: 1px; }
.preset-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.preset-card {
  position: relative;
  width: 100%; color: inherit; font: inherit; text-align: left;
  background: linear-gradient(170deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.03));
  border-radius: var(--r); padding: 14px; cursor: pointer;
  transition: all 0.2s; border: 1.5px solid var(--border);
  display: flex; align-items: center; gap: 14px;
}
.preset-card:hover { background: var(--bg-elev-hover); transform: translateY(-2px); }
.preset-card:focus-visible { outline: 3px solid rgba(108,124,255,.42); outline-offset: 2px; }
.preset-card.selected {
  border-color: var(--accent);
  background: linear-gradient(170deg, rgba(108, 124, 255, 0.18), rgba(168, 85, 247, 0.1));
  box-shadow: var(--accent-glow);
}
/* 选中勾标 */
.preset-card.selected::after {
  content: '✓';
  position: absolute; top: 8px; right: 10px;
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--accent-grad); color: #fff;
  font-size: 12px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--accent-glow);
}
.preset-preview { flex-shrink: 0; width: 62px; height: 62px; display: flex; align-items: center; justify-content: center; background: rgba(0, 0, 0, 0.32); border-radius: 10px; position: relative; overflow: hidden; }
.preset-thumb { background: linear-gradient(135deg, #cfd6ff, #e9c9ff); border-radius: 3px; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); box-shadow: 0 2px 8px rgba(0, 0, 0, 0.35); }
.preset-info { flex: 1; text-align: left; }
.preset-name { font-size: 15px; font-weight: 600; color: #fff; }
.preset-size { font-size: 12px; color: var(--text-dim); margin-top: 2px; }
.preset-meta { font-size: 11px; color: var(--text-faint); margin-top: 5px; }

.custom-section { margin-top: 34px; }
.room-input-area { display: flex; gap: 12px; align-items: center; }
.room-input-area input {
  flex: 1; padding: 15px 16px;
  background: rgba(255, 255, 255, 0.07); border: 1.5px solid var(--border);
  border-radius: 13px; color: #fff; font-size: 18px;
  letter-spacing: 8px; text-align: center; outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.room-input-area input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(108, 124, 255, 0.18); }
.btn-secondary {
  padding: 15px 20px; background: var(--bg-elev); border: 1.5px solid var(--border);
  border-radius: 13px; color: #fff; font-size: 14px; cursor: pointer; white-space: nowrap; transition: all 0.2s;
}
.btn-secondary:hover { background: var(--bg-elev-hover); border-color: var(--border-strong); }
.create-btn {
  display: block; width: 100%; margin-top: 34px; padding: 17px;
  background: var(--accent-grad); border: none; border-radius: 15px;
  color: #fff; font-size: 17px; font-weight: 600; cursor: pointer;
  box-shadow: 0 8px 24px rgba(108, 124, 255, 0.35); transition: all 0.2s;
}
.create-btn:hover { transform: translateY(-2px); box-shadow: 0 13px 30px rgba(108, 124, 255, 0.5); }
.create-btn:active { transform: translateY(0); }

/* ============================================================================
   白板页
   ============================================================================ */
#boardPage {
  display: grid;
  grid-template-rows: auto 1fr;
  grid-template-columns: 60px 1fr;
  grid-template-areas: "top top" "side main";
  height: 100vh; height: 100dvh; overflow: hidden;
  /* 双层环境光只作用于应用框架，画布纸张仍保持独立、清晰的工作区对比。 */
  background:
    radial-gradient(circle at 18% -20%, rgba(108,124,255,0.22), transparent 38%),
    radial-gradient(circle at 92% 12%, rgba(168,85,247,0.16), transparent 34%),
    var(--bg-deep);
}

/* ---- 顶部工具条 ---- */
#topBar {
  grid-area: top;
  display: flex; align-items: center; justify-content: space-between;
  padding: 9px 18px;
  background: linear-gradient(180deg, rgba(27,30,61,0.9), rgba(16,18,39,0.88));
  backdrop-filter: blur(22px) saturate(135%); -webkit-backdrop-filter: blur(22px) saturate(135%);
  border-bottom: 1px solid rgba(156,164,255,0.16);
  z-index: 10;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}
.top-left { display: flex; align-items: center; gap: 12px; }
.top-right { display: flex; align-items: center; gap: 12px; }
.icon-btn {
  position: relative;
  width: 38px; height: 38px;
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: 12px; color: rgba(229,232,255,0.72);
  cursor: pointer; font: inherit; font-size: 16px;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s;
}
.icon-btn:hover { background: linear-gradient(145deg, rgba(255,255,255,0.14), rgba(108,124,255,0.11)); color: #fff; transform: translateY(-1px); border-color: rgba(160,170,255,0.34); box-shadow: 0 7px 22px rgba(3,5,20,0.28); }
.icon-btn:active { transform: translateY(0) scale(0.96); }
.icon-btn:disabled { opacity: .38; cursor: not-allowed; transform: none; filter: saturate(.45); box-shadow: none; }
/* 图标恢复直观表达后仍提供文字提示；键盘 focus 与鼠标 hover 使用同一层反馈。 */
.icon-btn[data-tooltip]::after {
  content: attr(data-tooltip); position: absolute; top: calc(100% + 9px); left: 50%;
  padding: 6px 9px; color: #f4f5ff; background: rgba(9,11,27,0.96);
  border: 1px solid rgba(139,149,255,0.26); border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.34); font: 11px/1.2 inherit;
  white-space: nowrap; pointer-events: none; opacity: 0; transform: translate(-50%,-4px);
  transition: opacity 0.15s, transform 0.15s; z-index: 90;
}
.icon-btn[data-tooltip]:hover::after, .icon-btn[data-tooltip]:focus-visible::after { opacity: 1; transform: translate(-50%,0); }
/* AI 排版按钮重点强调 */
#arrangeBtn { background: linear-gradient(145deg, rgba(108,124,255,0.28), rgba(168,85,247,0.2)); border-color: rgba(139,149,255,0.48); color: #d9ddff; }
#arrangeBtn:hover { background: var(--accent-grad); color: #fff; box-shadow: var(--accent-glow); }
/* 快捷操作按钮使用克制的描边，与主 AI 按钮区分层级。 */
#commandBtn { color: #cbd2ff; border-color: rgba(108, 124, 255, 0.28); font-size: 22px; }
/* 全局画布边界使用蓝绿色区分于背景/AI，图标仍随主题自动换色。 */
#canvasSizeBtn { color:#9ee8df; border-color:rgba(74,222,190,.24); background:linear-gradient(145deg,rgba(45,212,191,.12),rgba(108,124,255,.1)); }
#canvasSizeBtn:not(:disabled):hover { color:#effffc; border-color:rgba(94,234,212,.52); background:linear-gradient(145deg,rgba(45,212,191,.27),rgba(108,124,255,.18)); }
.board-name { font-size: 15px; font-weight: 600; color: #fff; max-width: 180px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.board-name::before { content: '◇'; margin-right: 8px; color: #9ca7ff; filter: drop-shadow(0 0 7px rgba(108,124,255,0.58)); }
.room-badge {
  padding: 4px 11px;
  background: var(--accent-soft);
  border: 1px solid rgba(108, 124, 255, 0.3);
  border-radius: 999px; font-size: 11px; color: #aab6ff;
}
.user-badge {
  padding: 4px 11px;
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: 999px; font-size: 12px; color: var(--text-dim);
}
.top-actions { display: flex; gap: 6px; }

/* ---- 左侧工具栏：悬浮圆角胶囊 ---- */
#sideToolbar {
  grid-area: side;
  display: flex; flex-direction: column; align-items: center;
  padding: 14px 0; gap: 10px;
  background: linear-gradient(90deg, rgba(23,26,54,0.94), rgba(17,19,41,0.9));
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  border-right: 1px solid rgba(156,164,255,0.13);
  z-index: 10;
}
.side-tool {
  position: relative;
  width: 42px; height: 42px;
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: 13px; color: var(--text-dim);
  cursor: pointer; font: inherit; font-size: 18px;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s;
}
.side-tool:hover { background: var(--bg-elev-hover); color: #fff; transform: translateX(2px); }
.side-tool.active {
  background: var(--accent-grad);
  border-color: transparent; color: #fff;
  box-shadow: var(--accent-glow);
}
.side-tool.active::after {
  content: ''; position: absolute; right: -10px; width: 3px; height: 19px;
  border-radius: 999px; background: #aeb6ff; box-shadow: 0 0 10px rgba(139,149,255,0.8);
}
/* 左侧工具提示放在按钮右侧，不占用画布；active 的 ::after 仍专用于选中指示条。 */
.side-tool[data-tooltip]::before {
  content: attr(data-tooltip); position: absolute; left: calc(100% + 13px); top: 50%;
  padding: 7px 10px; color: #f4f5ff; background: rgba(9,11,27,0.96);
  border: 1px solid rgba(139,149,255,0.28); border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.34); font: 11px/1.2 inherit;
  white-space: nowrap; pointer-events: none; opacity: 0; transform: translate(-4px,-50%);
  transition: opacity 0.15s, transform 0.15s; z-index: 90;
}
.side-tool[data-tooltip]:hover::before, .side-tool[data-tooltip]:focus-visible::before { opacity: 1; transform: translate(0,-50%); }

/* ---- 画布区 ---- */
#canvasArea { grid-area: main; position: relative; overflow: hidden; }
#canvasWrap {
  position: absolute; inset: 0;
  /* Canvas 首帧绘制前的回退色与运行时工作区一致，避免加载时先闪一块白屏。 */
  background: #cbd1dc;
}
#whiteboard { display: block; width: 100%; height: 100%; cursor: crosshair; touch-action: none; background: #fdfdfe; }

/* ---- 底部状态栏：胶囊 ---- */
#statusBar {
  position: absolute; bottom: 12px; left: 12px;
  display: flex; gap: 10px; padding: 7px 14px;
  background: rgba(13, 15, 33, 0.78);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: 999px; font-size: 12px; color: var(--text-dim); white-space: nowrap;
  z-index: 5;
}
.active-tool-status { padding-right: 10px; color: #f2f3ff; border-right: 1px solid var(--border-strong); font-weight: 650; }

/* ---- 缩放控件：固定在画布右下角，避免跟随 canvas 文档流跑到视口外 ---- */
#zoomControls {
  position: absolute; right: 14px; bottom: 12px; z-index: 8;
  display: flex; align-items: center; gap: 4px; padding: 5px;
  color: var(--text-dim); background: rgba(13, 15, 33, 0.82);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border); border-radius: 12px;
}
#zoomControls button {
  width: 31px; height: 31px; color: var(--text-dim); background: transparent;
  border: 0; border-radius: 8px; cursor: pointer; font-size: 16px;
}
#zoomControls button:hover { color: #fff; background: var(--bg-elev-hover); }
#zoomLevel { min-width: 48px !important; text-align: center; font-size: 11px !important; font-variant-numeric: tabular-nums; }

/* ---- Canvas 内联文本编辑器：定位由 whiteboard.js 写入 left/top ---- */
#textEditorWrap { position: absolute; z-index: 30; }
#textEditor {
  min-width:80px; max-width:min(520px,80vw); min-height:38px; max-height:min(360px,58vh);
  padding: 6px 8px; resize: both; overflow: auto;
  scrollbar-width:none; scrollbar-color:transparent transparent;
  color: #111827; background: rgba(255,255,255,0.96);
  border: 2px solid var(--accent); border-radius: 8px; outline: none;
  box-shadow: 0 8px 30px rgba(13, 15, 33, 0.3);
  font-family: inherit; line-height: 1.35; user-select: text; -webkit-user-select: text;
}

/* ---- AI 排版面板 & 导出菜单 ---- */
.ai-menu {
  position: absolute; top: 12px; right: 12px;
  display: flex; flex-direction: column; gap: 4px;
  padding: 13px; width: auto; min-width: 232px;
  background: linear-gradient(155deg, rgba(27,30,63,0.97), rgba(11,13,31,0.97));
  backdrop-filter: blur(22px) saturate(140%); -webkit-backdrop-filter: blur(22px) saturate(140%);
  border: 1px solid rgba(133,145,255,0.34);
  border-radius: 18px; z-index: 15;
  box-shadow: 0 22px 65px rgba(3,5,20,0.5), inset 0 1px rgba(255,255,255,0.06);
  animation: modalIn 0.18s ease;
}
.ai-menu.hidden { display: none; }
#aiMenu { width: min(352px,calc(100vw - 24px)); }
.ai-menu-title { font-size: 11px; font-weight: 700; color: #9facff; padding: 5px 7px 3px; letter-spacing: 1.5px; }
.ai-menu-heading { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.ai-scope-badge {
  padding: 4px 8px; color: #ffcc80; background: rgba(251,191,36,0.09);
  border: 1px solid rgba(251,191,36,0.22); border-radius: 999px; font-size: 10px;
}
.ai-scope-badge.ready { color: #83ecc8; background: rgba(52,211,153,0.09); border-color: rgba(52,211,153,0.24); }
.ai-menu-hint {
  max-width: none; padding: 5px 7px 9px;
  color: var(--text-faint); font-size: 11px; line-height: 1.55;
}
.ai-menu-divider { height: 1px; background: var(--border); margin: 5px 0; }
.ai-menu button {
  padding: 10px 13px;
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: 9px; color: var(--text);
  font-size: 13px; cursor: pointer; white-space: nowrap; text-align: left;
  transition: all 0.16s;
}
.ai-menu button:hover { background: var(--bg-elev-hover); border-color: var(--border-strong); transform: translateX(2px); }
.ai-menu button:disabled { opacity: 0.42; cursor: not-allowed; filter: saturate(0.45); transform: none; }
.ai-primary-actions { display: grid; gap: 6px; }
.ai-primary-actions button { display: flex; flex-direction: column; gap: 3px; white-space: normal; }
.ai-primary-actions button strong, .ai-full-board strong { font-size: 12px; font-weight: 700; }
.ai-primary-actions button small, .ai-full-board small { color: var(--text-faint); font-size: 10px; line-height: 1.35; }
.ai-menu button[data-ai] {
  background: linear-gradient(135deg, rgba(108, 124, 255, 0.24), rgba(168, 85, 247, 0.24));
  border-color: rgba(108, 124, 255, 0.42); font-weight: 600;
}
.ai-menu button[data-ai]:hover { background: var(--accent-grad); color: #fff; }
.ai-menu button[data-ai]:hover small { color: rgba(255,255,255,0.72); }
.ai-arrange-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 5px; }
.ai-arrange-grid button { padding: 8px 5px; font-size: 10px; text-align: center; white-space: normal; }
.ai-full-board {
  display: flex; align-items: flex-start; flex-direction: column; gap: 2px;
  color: #cfd5ff !important; background: rgba(108,124,255,0.07) !important;
  border-style: dashed !important; white-space: normal !important;
}
.ai-full-board:hover { background: rgba(108,124,255,0.15) !important; }

/* ---- AI 排版候选预览：先比较、再确认，避免一键改写带来的失控感 ---- */
.ai-preview-modal {
  position: fixed; inset: 0; z-index: 120;
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
  background: rgba(7, 9, 24, 0.72);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.ai-preview-modal.hidden { display: none; }
.ai-preview-dialog {
  width: min(960px, 94vw); max-height: min(760px, 90vh); overflow: auto;
  padding: 22px;
  background: linear-gradient(155deg, rgba(27, 30, 62, 0.99), rgba(13, 15, 35, 0.99));
  border: 1px solid rgba(124, 137, 255, 0.42); border-radius: 22px;
  box-shadow: 0 28px 90px rgba(0, 0, 0, 0.58);
  animation: modalIn 0.22s cubic-bezier(0.22, 1, 0.36, 1);
}
#textEditor::-webkit-scrollbar { width:7px; height:7px; }
#textEditor::-webkit-scrollbar-thumb { background:transparent; border-radius:999px; }
#textEditor::-webkit-scrollbar-track { background:transparent; }
#textEditor.is-scrolling { scrollbar-width:thin; scrollbar-color:rgba(91,107,137,.58) transparent; }
#textEditor.is-scrolling::-webkit-scrollbar-thumb { background:rgba(91,107,137,.58); }

/* ---- 房主离开：三种房间级处置必须显式选择并等待服务端确认 ---- */
.owner-leave-modal {
  position:fixed; inset:0; z-index:5000; isolation:isolate;
  overflow-y:auto; overscroll-behavior:contain;
  padding:max(18px,env(safe-area-inset-top)) max(18px,env(safe-area-inset-right))
    max(18px,env(safe-area-inset-bottom)) max(18px,env(safe-area-inset-left));
}
.owner-leave-dialog {
  position:relative; z-index:1;
  width: min(480px,100%); max-width: 480px;
  max-height: calc(100vh - 48px); max-height: calc(100dvh - 48px);
  overflow-y: auto; overscroll-behavior: contain; box-sizing: border-box;
}
.owner-leave-options { display: grid; gap: 9px; }
.owner-leave-policy {
  width: 100%; min-height: 68px; display: flex; align-items: center; gap: 12px;
  padding: 12px 13px; color: inherit; background: var(--bg-elev);
  border: 1px solid var(--border); border-radius: 12px; cursor: pointer;
  text-align: left; transition: transform .16s, background .16s, border-color .16s, opacity .16s;
}
.owner-leave-policy:hover { transform: translateY(-1px); background: var(--bg-elev-hover); border-color: rgba(124,137,255,.54); }
.owner-leave-policy.danger { border-color: rgba(248,113,113,.34); }
.owner-leave-policy.danger:hover { background: rgba(248,113,113,.12); border-color: rgba(248,113,113,.62); }
.owner-leave-policy:disabled { opacity: .5; cursor: wait; transform: none; }
.owner-leave-policy.pending { opacity: 1; border-color: var(--accent); box-shadow: 0 0 0 2px rgba(108,124,255,.14); }
.owner-leave-policy-icon {
  width: 36px; height: 36px; flex: 0 0 36px; display: grid; place-items: center;
  color: #dce1ff; background: rgba(108,124,255,.18); border-radius: 10px; font-size: 18px;
}
.owner-leave-policy.danger .owner-leave-policy-icon { color: #ffc4ca; background: rgba(248,113,113,.14); }
.owner-leave-policy > span:last-child { min-width: 0; display: flex; flex-direction: column; gap: 3px; }
.owner-leave-policy strong { color: currentColor; font-size: 13px; }
.owner-leave-policy small { color: currentColor; opacity: .62; font-size: 10px; line-height: 1.45; }
.owner-leave-notice { margin: -7px 0 12px; padding: 9px 10px; color: #ffe3a3; background: rgba(251,191,36,.09); border: 1px solid rgba(251,191,36,.24); border-radius: 9px; font-size: 10px; line-height: 1.5; }
.owner-leave-error { min-height: 18px; padding-top: 8px; color: #ff9daa; font-size: 11px; line-height: 1.45; }
.owner-leave-actions { justify-content: flex-end; margin-top: 5px; }
.owner-leave-actions .server-modal-btn { flex: 0 1 auto; min-width: 132px; }

@media (max-width: 520px) {
  .owner-leave-modal { align-items: flex-end; padding: 9px; }
  .owner-leave-dialog {
    max-width: none; max-height: calc(100vh - 18px); max-height: calc(100dvh - 18px);
    padding: 23px 16px max(16px,env(safe-area-inset-bottom));
    border-radius: 20px 20px 10px 10px;
  }
  .owner-leave-policy { min-height: 64px; }
  .owner-leave-actions .server-modal-btn { width: 100%; flex: 1; }
}

/* ---- 逻辑画布尺寸：房主发起后经版本寄存器可靠同步到全部设备 ---- */
.canvas-size-modal {
  position:fixed; inset:0; z-index:125; padding:20px;
  display:flex; align-items:center; justify-content:center;
  background:rgba(5,8,24,.72); backdrop-filter:blur(13px) saturate(120%); -webkit-backdrop-filter:blur(13px) saturate(120%);
}
.canvas-size-modal.hidden { display:none; }
.canvas-size-dialog {
  width:min(620px,94vw); max-height:min(820px,92vh); overflow:auto; padding:24px;
  color:var(--text); background:
    radial-gradient(circle at 0 0,rgba(45,212,191,.13),transparent 36%),
    radial-gradient(circle at 100% 10%,rgba(108,124,255,.18),transparent 38%),
    linear-gradient(155deg,rgba(27,31,61,.985),rgba(12,15,34,.99));
  border:1px solid rgba(132,151,255,.4); border-radius:24px;
  box-shadow:0 32px 100px rgba(0,0,0,.62),inset 0 1px rgba(255,255,255,.07);
  animation:modalIn .22s cubic-bezier(.22,1,.36,1);
}
.canvas-size-header,.canvas-size-heading,.canvas-size-current,.canvas-size-options,.canvas-size-actions { display:flex; align-items:center; }
.canvas-size-header { justify-content:space-between; gap:16px; }
.canvas-size-heading { min-width:0; gap:13px; }
.canvas-size-mark { width:46px; height:46px; flex:0 0 46px; display:grid; place-items:center; color:#a8fff1; background:linear-gradient(145deg,rgba(45,212,191,.25),rgba(108,124,255,.22)); border:1px solid rgba(115,238,218,.32); border-radius:15px; box-shadow:0 10px 28px rgba(31,188,166,.18); }
.canvas-size-mark .ui-icon { width:25px; height:25px; }
.canvas-size-heading h2 { color:#fff; font-size:19px; line-height:1.3; }
.canvas-size-heading p { margin-top:3px; color:var(--text-dim); font-size:11px; line-height:1.45; }
.canvas-size-close { width:36px; height:36px; flex:0 0 36px; color:var(--text-dim); background:var(--bg-elev); border:1px solid var(--border); border-radius:11px; cursor:pointer; font-size:22px; line-height:1; }
.canvas-size-close:hover { color:#fff; background:var(--bg-elev-hover); }
.canvas-size-current { justify-content:space-between; margin:19px 0 17px; padding:12px 14px; background:rgba(5,8,24,.36); border:1px solid var(--border); border-radius:13px; }
.canvas-size-current span { color:var(--text-faint); font-size:10px; font-weight:700; letter-spacing:.8px; }
.canvas-size-current strong { color:#dce1ff; font-size:12px; font-variant-numeric:tabular-nums; }
.canvas-size-presets { min-width:0; display:grid; grid-template-columns:repeat(5,minmax(0,1fr)); gap:7px; border:0; }
.canvas-size-presets legend { grid-column:1/-1; margin-bottom:7px; color:#aab4ff; font-size:10px; font-weight:750; letter-spacing:1px; }
.canvas-size-presets button { min-width:0; padding:10px 7px; display:flex; flex-direction:column; align-items:flex-start; gap:3px; color:var(--text); background:var(--bg-elev); border:1px solid var(--border); border-radius:12px; cursor:pointer; text-align:left; transition:background .16s,border-color .16s,transform .16s; }
.canvas-size-presets button:hover { transform:translateY(-1px); background:var(--bg-elev-hover); border-color:rgba(146,158,255,.4); }
.canvas-size-presets button.active { background:linear-gradient(145deg,rgba(45,212,191,.2),rgba(108,124,255,.18)); border-color:rgba(94,234,212,.52); box-shadow:0 0 0 2px rgba(45,212,191,.07); }
.canvas-size-presets strong { overflow:hidden; width:100%; color:#eef0ff; font-size:10px; white-space:nowrap; text-overflow:ellipsis; }
.canvas-size-presets small { color:var(--text-faint); font-size:8px; font-variant-numeric:tabular-nums; white-space:nowrap; }
.canvas-size-editor { margin-top:18px; display:grid; grid-template-columns:minmax(0,1fr) 42px minmax(0,1fr); gap:9px; align-items:end; }
.canvas-size-editor label { min-width:0; display:flex; flex-direction:column; gap:7px; }
.canvas-size-editor label > span { color:var(--text-dim); font-size:11px; font-weight:650; }
.canvas-size-editor label small { margin-left:3px; color:var(--text-faint); font-weight:500; }
.canvas-size-editor input { width:100%; padding:13px 14px; color:#fff; background:rgba(5,8,24,.54); border:1px solid rgba(143,154,255,.25); border-radius:12px; outline:0; font:700 18px/1 inherit; font-variant-numeric:tabular-nums; user-select:text; -webkit-user-select:text; }
.canvas-size-editor input:focus { border-color:#8290ff; box-shadow:0 0 0 3px rgba(108,124,255,.12); }
.canvas-size-swap { width:42px; height:44px; color:#c8cfff; background:var(--bg-elev); border:1px solid var(--border); border-radius:12px; cursor:pointer; font-size:18px; }
.canvas-size-swap:hover { color:#fff; background:var(--bg-elev-hover); }
.canvas-size-options { justify-content:space-between; gap:12px; margin:13px 1px 0; }
.canvas-ratio-lock { display:flex; align-items:center; gap:8px; color:var(--text-dim); cursor:pointer; font-size:11px; }
.canvas-ratio-lock input { position:absolute; opacity:0; pointer-events:none; }
.canvas-ratio-lock > span { width:31px; height:18px; position:relative; flex:0 0 31px; background:rgba(255,255,255,.1); border:1px solid var(--border-strong); border-radius:999px; transition:.18s; }
.canvas-ratio-lock > span::after { content:''; position:absolute; top:2px; left:2px; width:12px; height:12px; background:#b9bfd8; border-radius:50%; transition:.18s; }
.canvas-ratio-lock input:checked + span { background:linear-gradient(90deg,#2dd4bf,#6c7cff); border-color:transparent; }
.canvas-ratio-lock input:checked + span::after { left:15px; background:#fff; }
.canvas-ratio-lock input:focus-visible + span { outline:2px solid var(--accent); outline-offset:2px; }
.canvas-size-ratio { color:#9eabff; font-size:10px; font-variant-numeric:tabular-nums; }
.canvas-size-warning { margin-top:15px; padding:11px 12px; color:#ffe3a3; background:rgba(251,191,36,.09); border:1px solid rgba(251,191,36,.25); border-radius:11px; font-size:10px; line-height:1.55; }
.canvas-size-error { min-height:18px; padding-top:7px; color:#ff9daa; font-size:10px; }

/* 升级前离线副本必须显眼但不冒充普通导出；点击仅下载，不会自动写入当前账号。 */
#exportMenu .recovery-export { color:#9a5b00; background:#fff8e8; border-top:1px solid #f0ddb7; }
#exportMenu .recovery-export:hover { color:#744300; background:#fff0c9; }
.canvas-size-actions { justify-content:flex-end; gap:9px; margin-top:5px; }
.canvas-size-actions button { min-height:42px; padding:0 18px; border-radius:12px; cursor:pointer; font:650 12px/1 inherit; }
.canvas-size-actions .secondary { color:var(--text-dim); background:var(--bg-elev); border:1px solid var(--border); }
.canvas-size-actions .primary { color:#fff; background:linear-gradient(135deg,#28bfae,#6c7cff); border:0; box-shadow:0 8px 24px rgba(54,169,183,.25); }
.canvas-size-actions button:disabled { opacity:.55; cursor:wait; box-shadow:none; }

@media (max-width:760px) {
  .canvas-size-modal { padding:9px; align-items:flex-end; }
  .canvas-size-dialog { width:100%; max-height:90vh; padding:18px 15px max(15px,env(safe-area-inset-bottom)); border-radius:22px 22px 10px 10px; }
  .canvas-size-presets { grid-template-columns:repeat(2,minmax(0,1fr)); }
  .canvas-size-presets button:last-child { grid-column:1/-1; }
  .canvas-size-heading p { max-width:250px; }
  .canvas-size-actions { position:sticky; bottom:calc(-1 * max(15px,env(safe-area-inset-bottom))); padding:10px 0 max(15px,env(safe-area-inset-bottom)); background:linear-gradient(180deg,rgba(12,15,34,0),rgba(12,15,34,.98) 24%); }
  .canvas-size-actions button { flex:1; min-height:46px; }
}
.ai-preview-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; margin-bottom: 18px; }
.ai-preview-title { color: #fff; font-size: 21px; font-weight: 750; }
.ai-preview-subtitle { margin-top: 5px; color: var(--text-dim); font-size: 12px; }
.ai-preview-close {
  width: 34px; height: 34px; flex: 0 0 auto;
  color: var(--text-dim); background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: 10px; cursor: pointer; font-size: 22px; line-height: 1;
}
.ai-candidate-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 13px; }
.ai-candidate-card {
  min-width: 0; padding: 11px; text-align: left; color: var(--text);
  background: rgba(255, 255, 255, 0.035); border: 1px solid var(--border);
  border-radius: 15px; cursor: pointer; transition: transform 0.18s, border-color 0.18s, background 0.18s;
}
.ai-candidate-card:hover { transform: translateY(-2px); border-color: rgba(124, 137, 255, 0.56); }
.ai-candidate-card.selected {
  background: linear-gradient(145deg, rgba(108, 124, 255, 0.17), rgba(168, 85, 247, 0.1));
  border-color: #7f8cff; box-shadow: 0 0 0 2px rgba(108, 124, 255, 0.14);
}
.ai-candidate-head { min-height: 24px; display: flex; align-items: center; justify-content: space-between; gap: 8px; font-weight: 700; }
.ai-recommended { padding: 3px 7px; color: #d9ddff; background: rgba(108, 124, 255, 0.28); border-radius: 999px; font-size: 10px; }
.ai-candidate-canvas { display: block; width: 100%; height: 154px; margin: 9px 0; border-radius: 9px; }
.ai-candidate-meta { color: var(--text-dim); font-size: 11px; }
.ai-candidate-meta strong { color: #b8c0ff; font-size: 16px; }
.ai-preview-detail {
  display: flex; flex-wrap: wrap; gap: 8px 16px; margin-top: 15px; padding: 12px 14px;
  color: var(--text-dim); background: rgba(0, 0, 0, 0.2); border: 1px solid var(--border);
  border-radius: 12px; font-size: 12px; line-height: 1.5;
}
.ai-preview-detail strong { color: #fff; }
.ai-preview-safe { color: #74e7a1; }
.ai-preview-warning { color: #f8c56b; }
.ai-preview-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 17px; }
.ai-preview-actions button { padding: 10px 17px; border-radius: 11px; cursor: pointer; font-size: 13px; font-weight: 650; }
.ai-preview-cancel { color: var(--text-dim); background: var(--bg-elev); border: 1px solid var(--border); }
.ai-preview-apply { color: #fff; background: var(--accent-grad); border: 0; box-shadow: var(--accent-glow); }
.ai-preview-apply:disabled { opacity: 0.45; cursor: not-allowed; box-shadow: none; }

/* ---- 全局快捷操作：搜索工具、图形、AI 与文件动作 ---- */
.command-palette {
  position: fixed; inset: 0; z-index: 140;
  display: flex; align-items: flex-start; justify-content: center;
  padding: min(15vh, 130px) 16px 24px;
  background: rgba(6, 8, 22, 0.58);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.command-dialog {
  width: min(640px, 96vw); overflow: hidden;
  background: linear-gradient(155deg, rgba(28, 31, 64, 0.99), rgba(12, 14, 33, 0.99));
  border: 1px solid rgba(132, 145, 255, 0.42); border-radius: 19px;
  box-shadow: 0 30px 100px rgba(0, 0, 0, 0.62), 0 0 0 1px rgba(255,255,255,0.025) inset;
  animation: modalIn 0.18s cubic-bezier(0.22, 1, 0.36, 1);
}
.command-search-wrap {
  display: flex; align-items: center; gap: 11px; padding: 13px 15px;
  border-bottom: 1px solid var(--border);
}
.command-search-icon { color: #aeb8ff; font-size: 25px; line-height: 1; }
#commandSearch {
  flex: 1; min-width: 0; padding: 8px 0; color: #fff; background: transparent;
  border: 0; outline: 0; font: 500 16px/1.3 inherit; user-select: text; -webkit-user-select: text;
}
#commandSearch::placeholder { color: var(--text-faint); }
.command-search-wrap kbd, .shape-search-wrap kbd, .command-item kbd {
  padding: 3px 7px; color: var(--text-faint); background: rgba(255,255,255,0.055);
  border: 1px solid var(--border); border-radius: 6px; font: 10px/1.35 inherit;
}
.command-results { max-height: min(54vh, 470px); overflow-y: auto; padding: 8px; }
.command-item {
  width: 100%; display: flex; align-items: center; gap: 11px; padding: 9px 10px;
  color: var(--text); background: transparent; border: 1px solid transparent; border-radius: 11px;
  cursor: pointer; text-align: left;
}
.command-item.active {
  background: linear-gradient(135deg, rgba(108,124,255,0.2), rgba(168,85,247,0.12));
  border-color: rgba(126,139,255,0.34);
}
.command-item-icon {
  width: 36px; height: 36px; flex: 0 0 auto; display: grid; place-items: center;
  color: #dfe3ff; background: rgba(255,255,255,0.07); border: 1px solid var(--border); border-radius: 10px;
  font-size: 18px;
}
.command-item-icon svg { width: 22px; height: 22px; overflow: visible; }
.command-item-main { min-width: 0; flex: 1; display: flex; flex-direction: column; gap: 2px; }
.command-item-label { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 13px; font-weight: 620; }
.command-item-group { color: var(--text-faint); font-size: 10px; }
.command-item kbd:empty { display: none; }
.command-empty { padding: 34px 16px; color: var(--text-faint); text-align: center; font-size: 13px; }
.command-footer { display: flex; gap: 16px; padding: 9px 14px; color: var(--text-faint); border-top: 1px solid var(--border); font-size: 10px; }

/* 窄屏把三个候选改为纵向，保留足够大的可点击区域。 */
@media (max-width: 760px) {
  .ai-preview-modal { padding: 10px; align-items: flex-end; }
  .ai-preview-dialog { width: 100%; max-height: 88vh; padding: 16px; border-radius: 20px 20px 10px 10px; }
  .ai-candidate-grid { grid-template-columns: 1fr; }
  .ai-candidate-canvas { height: 130px; }
  .ai-preview-actions { position: sticky; bottom: -16px; padding: 12px 0 16px; background: #11142e; }

  /* 手机采用“顶部操作 + 中间画布 + 底部横向工具栏”，避免窄屏被左栏挤占。 */
  #boardPage {
    grid-template-rows: auto minmax(0, 1fr) auto;
    grid-template-columns: 1fr;
    grid-template-areas: "top" "main" "side";
  }
  #topBar { padding: 7px 9px; flex-wrap: wrap; gap: 6px; }
  .top-left { min-width: 0; gap: 7px; }
  .top-right { width: 100%; gap: 0; }
  .top-actions { width: 100%; overflow-x: auto; justify-content: space-between; gap: 5px; scrollbar-width: none; }
  .top-actions::-webkit-scrollbar { display: none; }
  .user-badge { display: none; }
  .board-name { max-width: 42vw; font-size: 13px; }
  .room-badge { padding: 3px 7px; font-size: 10px; }
  .icon-btn { width: 36px; height: 36px; flex: 0 0 auto; }
  #sideToolbar {
    flex-direction: row; justify-content: flex-start; overflow-x: auto;
    padding: 7px max(8px, env(safe-area-inset-right)) max(7px, env(safe-area-inset-bottom)) max(8px, env(safe-area-inset-left));
    gap: 7px; border-right: 0; border-top: 1px solid var(--border);
  }
  .side-tool { width: 42px; height: 42px; flex: 0 0 auto; }
  .side-tool:hover { transform: translateY(-1px); }
  .side-tool.active::after { right: auto; bottom: -7px; width: 19px; height: 3px; }
  /* 触屏没有可靠 hover，文字由左下角“当前工具”状态承担，避免悬浮层遮挡画布。 */
  .icon-btn[data-tooltip]::after, .side-tool[data-tooltip]::before { display: none; }
  #bottomPanel { bottom: calc(57px + env(safe-area-inset-bottom)); max-height: 52vh; }
  #statusBar { bottom: 62px; left: 8px; max-width: calc(100% - 16px); gap: 6px; padding: 5px 9px; font-size: 10px; }
  #zoomControls { right: 8px; bottom: 98px; }
  .ai-menu { top: 8px; right: 8px; max-width: calc(100% - 16px); max-height: calc(100% - 80px); overflow-y: auto; }
  #aiMenu { width: min(352px,calc(100% - 16px)); }
}

@media (max-width: 520px) {
  /* 成员权限是核心入口，手机端不能隐藏；让较次要的当前工具标签为它腾出空间。 */
  #activeToolStatus { display:none; }
  #userCount { display:inline-flex; align-items:center; gap:4px; flex:0 0 auto; }
}

/* 系统要求减少动画时关闭装饰性运动，保留必要状态切换。 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; }
}

/* ---- 底部面板 ---- */
#bottomPanel {
  position: absolute; left: 0; right: 0; bottom: 0;
  max-height: 56vh;
  background: linear-gradient(180deg, rgba(26, 29, 58, 0.98), rgba(16, 18, 38, 0.98));
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--border-strong);
  border-radius: 18px 18px 0 0;
  z-index: 20;
  transform: translateY(calc(100% - 36px));
  transition: transform 0.32s cubic-bezier(0.22, 1, 0.36, 1);
  display: flex; flex-direction: column;
  box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.45);
}
#bottomPanel.expanded { transform: translateY(0); }
.panel-handle { width:100%; display: flex; justify-content: center; align-items: center; height: 36px; cursor: pointer; flex-shrink: 0; padding: 4px 0; gap: 10px; color:inherit; background:transparent; border:0; font:inherit; }
/* 手柄中间加一条抓握指示条 */
.panel-handle::before { content: ''; width: 44px; height: 4px; border-radius: 2px; background: rgba(255, 255, 255, 0.18); }
.handle-icon { font-size: 10px; color: var(--text-faint); transition: transform 0.3s; }
#bottomPanel.expanded .handle-icon { transform: rotate(180deg); }
.panel-content { overflow-y: auto; flex: 1; padding: 0 18px 18px; }

.panel-section { padding: 12px 0; }
.panel-title { font-size: 12px; font-weight: 700; color: var(--text-dim); margin-bottom: 10px; text-transform: uppercase; letter-spacing: 1.5px; }

/* ---- 画笔库 ---- */
.brush-cat-container { display: flex; gap: 5px; margin-bottom: 10px; flex-wrap: wrap; }
.cat-tab {
  padding: 6px 12px; background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: 999px; color: var(--text-dim); font-size: 11px; cursor: pointer;
  white-space: nowrap; transition: all 0.2s;
}
.cat-tab:hover { color: #fff; }
.cat-tab.active { background: var(--accent-grad); border-color: transparent; color: #fff; box-shadow: var(--accent-glow); }
.brush-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 7px; }
.brush-item {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 10px 4px;
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: 11px; color: var(--text-dim); cursor: pointer; transition: all 0.2s;
}
.brush-item:hover { background: var(--bg-elev-hover); color: #fff; transform: translateY(-1px); }
.brush-item.active { background: var(--accent-grad); border-color: transparent; color: #fff; box-shadow: var(--accent-glow); }
.brush-icon { font-size: 18px; }
.brush-name { font-size: 10px; }

.size-row { display: flex; align-items: center; gap: 10px; margin-top: 13px; font-size: 12px; color: var(--text-dim); }
.size-row label { white-space: nowrap; min-width: 62px; }
.size-row input[type=range] { flex: 1; accent-color: var(--accent); }
.size-row span { width: 30px; text-align: right; color: var(--text); font-weight: 600; }

/* ---- 图形库：精简分类 + 可见名称 + 搜索/最近使用 ---- */
.shape-panel-section { padding-top: 7px; }
.shape-panel-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; margin-bottom: 10px; }
.shape-panel-head .panel-title { margin-bottom: 3px; }
.shape-panel-hint { color: var(--text-faint); font-size: 10px; line-height: 1.5; }
.shape-count {
  flex: 0 0 auto; padding: 5px 9px; color: #aeb8ff; background: var(--accent-soft);
  border: 1px solid rgba(108,124,255,0.25); border-radius: 999px; font-size: 10px;
}
.shape-search-wrap {
  width: min(680px, 100%); display: flex; align-items: center; gap: 8px; margin-bottom: 12px; padding: 8px 11px;
  color: var(--text-faint); background: rgba(0,0,0,0.22); border: 1px solid var(--border); border-radius: 11px;
}
.shape-search-wrap:focus-within { border-color: rgba(108,124,255,0.6); box-shadow: 0 0 0 3px rgba(108,124,255,0.1); }
#shapeSearch {
  flex: 1; min-width: 0; color: #fff; background: transparent; border: 0; outline: 0;
  font: 12px/1.4 inherit; user-select: text; -webkit-user-select: text;
}
#shapeSearch::placeholder { color: var(--text-faint); }
.shape-filter-row {
  display: flex; gap: 6px; margin: 0 0 11px; padding-bottom: 2px;
  overflow-x: auto; scrollbar-width: none;
}
.shape-filter-row::-webkit-scrollbar { display: none; }
.shape-filter {
  flex: 0 0 auto; padding: 6px 11px; color: var(--text-faint);
  background: rgba(255,255,255,0.035); border: 1px solid var(--border);
  border-radius: 999px; cursor: pointer; font: 600 10px/1.2 inherit;
  transition: color 0.16s, background 0.16s, border-color 0.16s, transform 0.16s;
}
.shape-filter:hover { color: #fff; border-color: rgba(139,149,255,0.36); transform: translateY(-1px); }
.shape-filter.active {
  color: #fff; background: linear-gradient(135deg,rgba(108,124,255,0.76),rgba(168,85,247,0.7));
  border-color: transparent; box-shadow: 0 5px 15px rgba(79,91,209,0.28);
}
.shape-categories { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 13px 18px; }
.shape-filtered-cat { grid-column: 1 / -1; }
.shape-recent { grid-column: 1 / -1; padding-bottom: 10px; border-bottom: 1px solid var(--border); }
.shape-cat-label {
  display: flex; align-items: center; gap: 7px; margin-bottom: 7px;
  color: var(--text-dim); font-size: 11px; font-weight: 650; letter-spacing: 0.7px;
}
.shape-cat-label span { color: var(--text-faint); font-size: 9px; font-weight: 500; letter-spacing: 0; }
.shape-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(86px, 1fr)); gap: 6px; }
.shape-btn {
  min-width: 0; padding: 8px 6px;
  background: linear-gradient(145deg,rgba(255,255,255,0.065),rgba(255,255,255,0.025)); border: 1px solid var(--border);
  border-radius: 11px; color: var(--text-dim); cursor: pointer;
  display: flex; align-items: center; gap: 7px; transition: all 0.18s;
}
.shape-btn:hover { background: linear-gradient(145deg,rgba(121,134,255,0.18),rgba(168,85,247,0.1)); border-color: rgba(145,156,255,0.35); color: #fff; transform: translateY(-2px); box-shadow: 0 7px 20px rgba(4,6,22,0.22); }
.shape-btn.selected { background: var(--accent-grad); border-color: transparent; color: #fff; box-shadow: var(--accent-glow); }
.shape-icon { width: 25px; height: 25px; flex: 0 0 auto; display: grid; place-items: center; color: #dfe3ff; line-height: 1; }
.shape-icon svg { width: 23px; height: 23px; overflow: visible; transition: transform 0.18s, filter 0.18s; }
.shape-btn:hover .shape-icon svg { transform: scale(1.08); filter: drop-shadow(0 0 5px rgba(139,149,255,0.42)); }
.shape-name { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 10px; }
.shape-empty {
  grid-column: 1 / -1; display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 28px;
  color: var(--text-dim); background: rgba(255,255,255,0.025); border: 1px dashed var(--border-strong); border-radius: 12px; font-size: 13px;
}
.shape-empty small { color: var(--text-faint); font-size: 10px; }

@media (max-width: 760px) {
  /* 手机只显示一列分类，但每行保留 3 个带文字的大触控按钮。 */
  .shape-categories { grid-template-columns: 1fr; }
  .shape-recent { grid-column: auto; }
  .shape-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .shape-btn { min-height: 44px; }
  .shape-search-wrap kbd { display: none; }
  .command-palette { align-items: flex-start; padding: 9vh 9px 16px; }
  .command-dialog { width: 100%; border-radius: 17px; }
  .command-results { max-height: 60vh; }
  .command-footer { justify-content: space-between; gap: 5px; }
}

/* ---- 颜色面板 ---- */
.color-panel-section { padding-bottom: 8px; }
.color-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.color-previews { display: flex; gap: 6px; }
.color-preview-main { width: 38px; height: 26px; border-radius: 6px; border: 2px solid rgba(255, 255, 255, 0.35); }
.color-preview-sec { width: 26px; height: 26px; border-radius: 6px; border: 2px solid var(--border); }
.color-wheel-area { display: flex; align-items: center; justify-content: center; gap: 16px; margin-bottom: 12px; }
.hue-wheel-wrap { position: relative; width: 192px; height: 192px; }
#hueWheel { width:192px; height:192px; border-radius: 50%; display: block; box-shadow: 0 4px 16px rgba(0, 0, 0, 0.35); touch-action:none; }
.sv-overlay-wrap { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); }
#svSquare { width:104px; height:104px; border-radius: 8px; display: block; box-shadow: 0 2px 10px rgba(0, 0, 0, 0.42); touch-action:none; }
.color-actions { display: flex; flex-direction: column; gap: 8px; }
.color-action-btn {
  width: 34px; height: 34px; border-radius: 50%;
  background: var(--bg-elev); border: 1px solid var(--border);
  color: var(--text-dim); cursor: pointer; font-size: 16px;
  display: flex; align-items: center; justify-content: center; transition: all 0.15s;
}
.color-action-btn:hover { background: var(--accent-soft); border-color: var(--accent); color: #fff; }
.color-inputs { display: flex; gap: 12px; margin-bottom: 12px; }
.hsl-inputs { display: flex; flex-direction: column; gap: 5px; flex: 1; }
.hsl-row { display: flex; align-items: center; gap: 6px; font-size: 11px; color: var(--text-dim); }
.hsl-row label { width: 14px; font-weight: 700; }
.hsl-row input[type=range] { flex: 1; accent-color: var(--accent); }
.hsl-row span { width: 28px; text-align: right; }
.hex-row { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }
.hex-row input {
  width: 82px; padding: 7px;
  background: rgba(0, 0, 0, 0.35); border: 1px solid var(--border);
  border-radius: 8px; color: #fff; font-size: 12px; text-align: center;
}
.color-preview-sm { width: 30px; height: 30px; border-radius: 8px; border: 2px solid var(--border-strong); flex-shrink: 0; }
.color-preview { width: 32px; height: 32px; border-radius: 6px; border: 2px solid var(--border-strong); flex-shrink: 0; }
.color-bottom { display: flex; gap: 12px; }
.memory-section, .base-section { flex: 1; }
.memory-row { display: flex; align-items: center; justify-content: space-between; margin-bottom: 6px; }
.memory-title, .base-title { font-size: 11px; font-weight: 600; color: var(--text-faint); letter-spacing: 1px; }
.clear-memory-btn { background: none; border: none; color: var(--text-faint); font-size: 11px; cursor: pointer; padding: 0; transition: color 0.2s; }
.clear-memory-btn:hover { color: var(--red); }
.memory-colors, .base-colors { display: flex; gap: 5px; flex-wrap: wrap; }
.memory-swatch, .base-swatch {
  width: 23px; height: 23px; border-radius: 7px; cursor: pointer;
  border: 1px solid var(--border-strong); transition: transform 0.15s, box-shadow 0.15s;
}
.memory-swatch:hover, .base-swatch:hover { transform: scale(1.22); box-shadow: var(--shadow-sm); z-index: 2; }
.memory-empty { font-size: 11px; color: var(--text-faint); }

/* ---- 橡皮擦 / 文本 / 选择 面板 ---- */
.eraser-hint, .select-hint {
  font-size: 12.5px; color: var(--text-dim); line-height: 1.7;
  background: var(--bg-elev); border: 1px dashed var(--border);
  border-radius: 10px; padding: 10px 12px; margin-bottom: 4px;
}
.selected-info {
  margin-top: 10px; padding: 9px 12px;
  background: var(--accent-soft); border: 1px solid rgba(108, 124, 255, 0.3);
  border-radius: 10px; font-size: 12.5px; color: #b9c3ff;
}
.current-color-display {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 13px; font-size: 12px; color: var(--text-dim);
}
.color-preview-lg { width: 34px; height: 26px; border-radius: 7px; border: 2px solid var(--border-strong); }

/* ---- 选区附近的就地操作栏 ---- */
.selection-toolbar {
  position:absolute; z-index:14; display:flex; align-items:stretch; justify-content:center; flex-wrap:wrap;
  max-width:calc(100% - 16px); padding:5px;
  color:#eef0ff; background:rgba(20,22,32,.94); border:1px solid rgba(255,255,255,.13);
  border-radius:13px; box-shadow:0 12px 34px rgba(5,7,18,.38);
  backdrop-filter:blur(14px); -webkit-backdrop-filter:blur(14px);
  transform:translate(-50%,-100%); transform-origin:center bottom;
}
.selection-toolbar.hidden { display:none; }
.selection-toolbar [hidden] { display:none !important; }
.selection-toolbar.below { transform:translate(-50%,0); transform-origin:center top; }
.selection-toolbar::after {
  content:''; position:absolute; left:50%; top:100%; transform:translateX(-50%);
  border:7px solid transparent; border-top-color:rgba(20,22,32,.94);
}
.selection-toolbar.below::after { top:auto; bottom:100%; border-top-color:transparent; border-bottom-color:rgba(20,22,32,.94); }
.selection-toolbar-btn {
  min-height:42px; padding:8px 12px; display:inline-flex; align-items:center; justify-content:center; gap:6px;
  color:#e6e8f4; background:transparent; border:0; border-right:1px solid rgba(255,255,255,.1);
  cursor:pointer; touch-action:manipulation; font:600 12px/1 inherit; white-space:nowrap; transition:background .15s,color .15s;
}
.selection-toolbar-btn .ui-icon { width:15px; height:15px; }
.selection-toolbar-btn:hover, .selection-toolbar-btn:focus-visible { color:#fff; background:rgba(108,124,255,.2); outline:0; }
.selection-toolbar-btn.active { color:#fff; background:rgba(108,124,255,.16); }
.selection-toolbar-btn.danger { color:#ffb4c0; border-right:0; }
.selection-toolbar-btn.danger:hover, .selection-toolbar-btn.danger:focus-visible { color:#fff; background:rgba(244,63,94,.25); }
.selection-toolbar-btn:disabled { opacity:.38; cursor:not-allowed; background:transparent; }
.selection-color-dot { width:12px; height:12px; flex:0 0 auto; background:var(--selection-color,#8b95b8); border:2px solid rgba(255,255,255,.62); border-radius:50%; }
.selection-color-control { position:relative; display:flex; }
.selection-color-popover {
  position:absolute; left:0; top:calc(100% + 10px); z-index:2;
  width:204px; padding:10px; display:grid; grid-template-columns:repeat(5,30px); gap:8px;
  background:rgba(17,19,31,.98); border:1px solid rgba(255,255,255,.14); border-radius:13px;
  box-shadow:0 12px 30px rgba(3,5,15,.42);
}
.selection-color-popover.hidden { display:none; }
.selection-toolbar-swatch, .selection-custom-color {
  width:30px; height:30px; padding:0; display:grid; place-items:center; background:var(--swatch,#fff);
  border:2px solid rgba(255,255,255,.24); border-radius:8px; cursor:pointer; color:#fff;
}
.selection-toolbar-swatch:hover, .selection-toolbar-swatch:focus-visible, .selection-toolbar-swatch.active {
  outline:0; transform:scale(1.08); box-shadow:0 0 0 2px #11131f,0 0 0 4px #8a96ff;
}
.selection-custom-color { position:relative; overflow:hidden; background:linear-gradient(135deg,#f43f5e,#f59e0b,#22c55e,#06b6d4,#8b5cf6); font-size:18px; }
.selection-custom-color input { position:absolute; inset:0; width:100%; height:100%; opacity:0; cursor:pointer; }

@media (max-width:560px) {
  .selection-toolbar { padding:4px; border-radius:12px; }
  .selection-toolbar-btn { min-height:44px; padding:8px; font-size:10px; }
}

/* ---- 全局轻提示 ---- */
.toast {
  position: fixed; left: 50%; bottom: 96px; transform: translateX(-50%);
  padding: 11px 20px;
  background: rgba(13, 15, 33, 0.94);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(108, 124, 255, 0.45);
  border-radius: 999px; color: #fff; font-size: 13px;
  z-index: 100; max-width: 88vw;
  box-shadow: var(--shadow-lg);
  transition: opacity 0.3s, transform 0.3s;
  animation: toastIn 0.28s cubic-bezier(0.22, 1, 0.36, 1);
}
@keyframes toastIn { from { opacity: 0; transform: translate(-50%, 14px); } to { opacity: 1; transform: translate(-50%, 0); } }
.toast.hidden { opacity: 0; pointer-events: none; transform: translate(-50%, 8px); }

/* ============================================================================
   2026 体验升级：房间大厅 / 可见底部检查器 / 更清晰的视觉层级
   ============================================================================ */

.invite-auth-notice {
  margin: -10px 0 18px; padding: 10px 12px;
  color: #dce2ff; background: rgba(108,124,255,0.12);
  border: 1px solid rgba(139,149,255,0.28); border-radius: 11px;
  font-size: 12px; line-height: 1.55;
}

/* 仪表盘使用品牌区 + 用户区，信息层级比单独头像更完整。 */
.dashboard-brand { display: flex; align-items: center; gap: 11px; }
.dashboard-brand-mark {
  width:42px; height:42px; display:block; flex:0 0 42px; border-radius:13px;
  filter:drop-shadow(0 8px 15px rgba(17,32,68,.3));
  transition:transform .22s ease,filter .22s ease;
}
.dashboard-brand-mark img { width:100%; height:100%; display:block; border-radius:inherit; }
.dashboard-brand:hover .dashboard-brand-mark { transform:translateY(-1px); filter:drop-shadow(0 11px 19px rgba(17,32,68,.38)); }
.dashboard-brand > span:last-child { display: flex; flex-direction: column; gap: 2px; }
.dashboard-brand strong { color:#fff; font-size:16px; font-weight:760; letter-spacing:-.25px; }
.dashboard-brand small { color:var(--text-faint); font-size:9px; font-weight:650; letter-spacing:.8px; }
.dashboard-main::before { display: none; }
.dashboard-hero {
  max-width: 1180px; margin: 0 auto 28px; padding: clamp(22px,4vw,42px);
  display: grid; grid-template-columns: minmax(0,1fr) minmax(300px,440px); gap: 30px; align-items: center;
  background:
    radial-gradient(circle at 12% 15%,rgba(119,135,255,.2),transparent 36%),
    linear-gradient(145deg,rgba(32,37,78,.9),rgba(17,20,45,.88));
  border: 1px solid rgba(148,157,255,.2); border-radius: 26px;
  box-shadow: 0 25px 70px rgba(2,5,21,.28), inset 0 1px rgba(255,255,255,.05);
}
.eyebrow { color: #9eabff; font-size: 10px; font-weight: 750; letter-spacing: 2px; }
.dashboard-hero h1 { margin: 9px 0 8px; color: #fff; font-size: clamp(24px,3vw,38px); line-height: 1.18; letter-spacing: -.5px; }
.dashboard-hero p { color: var(--text-dim); font-size: 14px; line-height: 1.7; }
.dashboard-hero-note {
  min-width:280px; padding:18px 20px; display:flex; flex-direction:column; gap:6px;
  color:#eef1ff; background:rgba(7,10,29,.34); border:1px solid rgba(151,161,255,.22);
  border-radius:17px; box-shadow:inset 0 1px rgba(255,255,255,.04);
}
.dashboard-hero-note strong { font-size:13px; }
.dashboard-hero-note span { color:var(--text-dim); font-size:11px; line-height:1.55; }
.dashboard-hero-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.hero-action {
  min-width: 0; padding: 17px 15px; display: grid; grid-template-columns: auto 1fr; gap: 2px 10px; align-items: center;
  color: var(--text); background: rgba(255,255,255,.055); border: 1px solid var(--border-strong);
  border-radius: 16px; cursor: pointer; text-align: left; transition: transform .2s,background .2s,border-color .2s;
}
.hero-action:hover { transform: translateY(-3px); background: rgba(255,255,255,.1); border-color: rgba(151,161,255,.5); }
.hero-action.primary { background: linear-gradient(145deg,rgba(108,124,255,.38),rgba(168,85,247,.25)); border-color: rgba(148,159,255,.48); }
.hero-action > span { grid-row: 1 / 3; font-size: 24px; color: #dfe3ff; }
.hero-action strong { color: #fff; font-size: 13px; }
.hero-action small { color: var(--text-faint); font-size: 10px; white-space: normal; }
.dashboard-section-heading { max-width: 1180px; margin: 0 auto 13px; display: flex; align-items: center; justify-content: space-between; }
.dashboard-section-heading span,.dashboard-section-heading h2 { margin:0; color: #fff; font-size: 14px; font-weight: 700; }
.dashboard-section-heading small { color: var(--text-faint); font-size: 11px; }
.history-disclosure-section { width:min(1180px,100%); margin:0 auto; }
.history-disclosure-heading { max-width:none; gap:14px; margin-bottom:0; }
.history-disclosure-toggle {
  min-height:42px; padding:9px 12px 9px 15px; display:inline-flex; align-items:center; gap:8px;
  color:var(--text); background:var(--bg-elev); border:1px solid var(--border); border-radius:12px;
  cursor:pointer; font:inherit; box-shadow:0 5px 16px rgba(4,7,24,.12);
  transition:background .18s,border-color .18s,box-shadow .18s;
}
.dashboard-section-heading .history-disclosure-toggle span { color:inherit; font-size:12px; }
.dashboard-section-heading .history-disclosure-toggle small { padding:2px 7px; color:var(--text-dim); background:var(--bg-soft); border-radius:999px; }
.history-disclosure-toggle i { color:var(--accent); font:800 17px/1 inherit; transform:rotate(0); transition:transform .18s; }
.history-disclosure-toggle:hover { background:var(--bg-elev-hover); border-color:rgba(142,153,255,.42); box-shadow:0 8px 22px rgba(4,7,24,.17); }
.history-disclosure-toggle:focus-visible { outline:3px solid rgba(108,124,255,.34); outline-offset:2px; }
.history-disclosure-toggle[aria-expanded="true"] i { transform:rotate(180deg); }
.history-disclosure-panel { margin-top:13px; }
.history-disclosure-panel[hidden] { display:none!important; }
.records-grid { max-width: 1180px; margin: 0 auto; }
.empty-state { min-height: 34vh; }

/* 房间大厅 */
#lobbyPage {
  height:100vh; height:100dvh; min-height:0;
  overflow-x:hidden; overflow-y:auto; overscroll-behavior-y:contain;
  -webkit-overflow-scrolling:touch;
  background:
    radial-gradient(600px 360px at 10% 0,rgba(108,124,255,.18),transparent 72%),
    radial-gradient(520px 340px at 100% 20%,rgba(168,85,247,.14),transparent 72%),var(--bg-deep);
}
.lobby-header p { margin-top: 3px; color: var(--text-faint); font-size: 11px; }
.lobby-brand-mark { width:34px; height:34px; display:block; flex:0 0 34px; border-radius:10px; }
.lobby-brand-mark img { width:100%; height:100%; display:block; }
.lobby-header-copy { min-width:0; }
.lobby-account { padding: 7px 11px; color: var(--text-dim); background: var(--bg-elev); border: 1px solid var(--border); border-radius: 999px; font-size: 11px; }
.lobby-main { width: min(920px,calc(100% - 32px)); margin: 0 auto; padding: clamp(32px,7vh,72px) 0 70px; }
.lobby-card {
  position: relative; overflow: hidden; padding: clamp(26px,5vw,48px);
  background: linear-gradient(150deg,rgba(31,35,76,.94),rgba(14,17,39,.94));
  border: 1px solid rgba(143,154,255,.27); border-radius: 28px;
  box-shadow: 0 28px 80px rgba(2,4,18,.42), inset 0 1px rgba(255,255,255,.055);
}
.lobby-card h2 { margin: 9px 0 8px; color: #fff; font-size: clamp(26px,4vw,40px); }
.lobby-card > p { max-width: 590px; color: var(--text-dim); font-size: 13px; line-height: 1.75; }
.lobby-mode-switch { width:max-content; margin-top:22px; padding:4px; display:flex; gap:3px; background:rgba(4,7,22,.42); border:1px solid rgba(145,156,255,.18); border-radius:12px; }
.lobby-mode-switch button { min-height:38px; padding:8px 14px; color:var(--text-faint); background:transparent; border:1px solid transparent; border-radius:9px; cursor:pointer; font:650 11px/1 inherit; }
.lobby-mode-switch button:hover { color:var(--text); }
.lobby-mode-switch button.active { color:#fff; background:rgba(112,128,244,.24); border-color:rgba(145,156,255,.3); box-shadow:0 4px 12px rgba(4,7,24,.18); }
.lobby-orbit { position: absolute; right: 7%; top: 27px; width: 132px; height: 132px; border: 1px solid rgba(140,151,255,.18); border-radius: 50%; opacity: .75; }
.lobby-orbit::before { content:''; position:absolute; inset:22px; border:1px solid rgba(175,116,255,.22); border-radius:50%; }
.lobby-orbit span { position:absolute; inset:0; display:grid; place-items:center; color:#cdd3ff; font-size:42px; filter:drop-shadow(0 0 14px rgba(108,124,255,.7)); }
.lobby-orbit i { position:absolute; width:7px; height:7px; border-radius:50%; background:#8c9aff; box-shadow:0 0 10px #7887ff; }
.lobby-orbit i:nth-child(1){left:9px;top:32px}.lobby-orbit i:nth-child(2){right:17px;bottom:20px}.lobby-orbit i:nth-child(3){left:45px;bottom:-3px;background:#b36eff}
.lobby-join-form { margin-top: 30px; max-width: 660px; }
.lobby-join-form > label { display:block; margin-bottom:8px; color:var(--text-faint); font-size:11px; font-weight:650; letter-spacing:.7px; }
.lobby-input-row { display: flex; gap: 10px; }
#lobbyRoomCode {
  min-width:0; flex:1; padding:16px 18px; color:#fff; background:rgba(5,7,22,.55);
  border:1px solid rgba(145,156,255,.28); border-radius:14px; outline:0;
  font:700 22px/1 inherit; letter-spacing:10px; text-align:center; user-select:text; -webkit-user-select:text;
}
#lobbyRoomCode:focus { border-color:#8190ff; box-shadow:0 0 0 4px rgba(108,124,255,.13); }
#joinRoomBtn { padding:0 24px; color:#fff; background:var(--accent-grad); border:0; border-radius:14px; cursor:pointer; font-weight:700; box-shadow:var(--accent-glow); }
#joinRoomBtn:disabled { opacity:.6; cursor:wait; box-shadow:none; }
.lobby-error { min-height:20px; padding-top:8px; color:#ff9aa8; font-size:12px; }
.recent-room-section { margin-top:28px; }
.recent-room-grid { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:10px; }
.recent-room-card { min-width:0; display:flex; align-items:center; gap:12px; padding:14px; color:var(--text); background:var(--bg-elev); border:1px solid var(--border); border-radius:15px; cursor:pointer; text-align:left; }
.recent-room-card:hover { background:var(--bg-elev-hover); border-color:rgba(142,153,255,.38); transform:translateY(-1px); }
.recent-room-preview { width:66px; height:52px; flex:0 0 66px; display:grid; place-items:center; background:var(--bg-soft); border:1px solid var(--border); border-radius:10px; overflow:hidden; }
.recent-room-paper { display:block; flex:0 0 auto; background:var(--paper,#fdfdfe); border:1px solid rgba(70,80,94,.34); border-radius:2px; box-shadow:0 4px 10px rgba(20,28,40,.16); }
.recent-room-paper.dot { background-color:var(--paper,#fdfdfe); background-image:radial-gradient(#aeb8cb 1px,transparent 1px); background-size:5px 5px; }
.recent-room-paper.grid { background-color:var(--paper,#fdfdfe); background-image:linear-gradient(#d5dbe5 1px,transparent 1px),linear-gradient(90deg,#d5dbe5 1px,transparent 1px); background-size:6px 6px; }
.recent-room-paper.dark.dot { background-image:radial-gradient(rgba(218,224,244,.28) 1px,transparent 1px); }
.recent-room-paper.dark.grid { background-image:linear-gradient(rgba(218,224,244,.2) 1px,transparent 1px),linear-gradient(90deg,rgba(218,224,244,.2) 1px,transparent 1px); }
.recent-room-copy { min-width:0; flex:1; display:flex; flex-direction:column; gap:3px; }
.recent-room-card strong { overflow:hidden; text-overflow:ellipsis; white-space:nowrap; font-size:12px; }
.recent-room-card small { color:var(--text-faint); font-size:10px; }
.recent-room-card em { display:grid; gap:2px; color:var(--text-dim); font-size:11px; line-height:1.35; font-style:normal; }
.recent-room-card em span:last-child { color:var(--text-faint); }
.recent-room-card b { color:#8f9cff; }
.recent-room-empty { grid-column:1/-1; padding:22px; color:var(--text-faint); background:rgba(255,255,255,.025); border:1px dashed var(--border); border-radius:15px; text-align:center; font-size:12px; }

/* 橡皮擦模式选择 */
.eraser-mode-switch { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:8px; margin-bottom:10px; }
.eraser-mode { min-width:0; padding:10px 12px; display:flex; flex-direction:column; gap:3px; color:var(--text-dim); background:var(--bg-elev); border:1px solid var(--border); border-radius:11px; cursor:pointer; text-align:left; }
.eraser-mode strong { color:#eef0ff; font-size:12px; }.eraser-mode small { color:var(--text-faint); font-size:10px; }
.eraser-mode.active { background:linear-gradient(145deg,rgba(108,124,255,.25),rgba(168,85,247,.15)); border-color:rgba(137,149,255,.52); box-shadow:0 0 0 2px rgba(108,124,255,.08); }

/*
 * 底部参数面板成为真正的 Grid 行，不再 absolute 覆盖画布。桌面端与移动端都能
 * 看见完整手柄；展开时画布自动缩小，状态栏和缩放按钮不会被面板遮住。
 */
#boardPage { grid-template-rows:auto minmax(0,1fr) auto; grid-template-areas:"top top" "side main" "side panel"; }
#bottomPanel {
  grid-area:panel; position:relative; left:auto; right:auto; bottom:auto; max-height:none;
  transform:none; border-radius:18px 18px 0 0; overflow:hidden;
}
#bottomPanel.expanded { transform:none; }
.panel-handle { justify-content:center; min-height:36px; }
.panel-peek-label { color:var(--text-faint); font-size:10px; font-weight:650; letter-spacing:.6px; }
.panel-content { min-height:0; max-height:0; padding:0 18px; opacity:0; overflow-y:auto; transition:max-height .3s cubic-bezier(.22,1,.36,1),opacity .18s,padding .3s; }
#bottomPanel.expanded .panel-content { max-height:min(48vh,520px); padding:0 18px 18px; opacity:1; }
#bottomPanel.panel-instant .panel-content { transition:none !important; }
.panel-handle:hover { background:rgba(108,124,255,.06); }
.panel-section { min-width:0; }
@media (min-width:1100px) {
  .brush-grid { grid-template-columns:repeat(auto-fit,minmax(105px,1fr)); }
  .shape-categories { grid-template-columns:repeat(3,minmax(0,1fr)); }
}

@media (max-width:760px) {
  .dashboard-header { padding:12px; }.dashboard-user .user-detail { display:none; }
  .dashboard-main { padding:16px 14px 110px; }
  .dashboard-hero { grid-template-columns:1fr; padding:24px 20px; border-radius:21px; }
  .dashboard-hero-note { min-width:0; }
  .dashboard-hero-actions { grid-template-columns:1fr; }
  .lobby-main { width:min(100% - 22px,920px); padding-top:24px; }
  .lobby-card { padding:25px 18px; border-radius:22px; }.lobby-orbit { opacity:.3; right:-38px; }
  .lobby-input-row { flex-direction:column; }#joinRoomBtn { min-height:50px; }.recent-room-grid { grid-template-columns:1fr; }
  .lobby-mode-switch { width:100%; }.lobby-mode-switch button { min-height:44px; flex:1; }
  .lobby-account { display:none; }
  .lobby-header { padding-inline:11px; gap:8px; }
  .lobby-brand-mark { width:32px; height:32px; flex-basis:32px; }
  .lobby-header-copy h1 { overflow:hidden; font-size:16px; text-overflow:ellipsis; white-space:nowrap; }
  .lobby-header-copy p { overflow:hidden; max-width:44vw; text-overflow:ellipsis; white-space:nowrap; }
  #boardPage { grid-template-rows:auto minmax(0,1fr) auto auto; grid-template-columns:1fr; grid-template-areas:"top" "main" "panel" "side"; }
  #bottomPanel { bottom:auto; max-height:none; }
  #bottomPanel.expanded .panel-content { max-height:min(42vh,430px); }
  #statusBar { bottom:8px; }
  #zoomControls { bottom:8px; }
  .eraser-mode-switch { grid-template-columns:1fr 1fr; }
}

@media (max-width:480px) {
  .dashboard-brand small { display:none; }.dashboard-brand-mark { width:38px;height:38px; }
  .dashboard-hero h1 { font-size:24px; }.dashboard-hero p { font-size:12px; }
  .history-disclosure-heading { align-items:flex-start; flex-direction:column; }
  .history-disclosure-toggle { width:100%; justify-content:center; }
  #lobbyRoomCode { letter-spacing:7px; }
}