/* ═══════════════════════════════════════════════════════════════════
   iTalk 视频会议系统 — 现代设计 v4
   风格：深邃暗色 + 微渐变 + 玻璃质感 + 现代圆角
   ═══════════════════════════════════════════════════════════════════ */

:root {
    /* ── 背景色阶 ── */
    --bg-primary:    #090b10;
    --bg-secondary:  #0e111a;
    --bg-tertiary:   #141824;
    --bg-card:       #161a26;
    --bg-hover:      #1c2132;
    --bg-glass:      rgba(14,17,26,0.78);

    /* ── 边框 ── */
    --border:        rgba(255,255,255,0.07);
    --border-light:  rgba(255,255,255,0.11);
    --border-accent: rgba(99,130,255,0.35);

    /* ── 文字 ── */
    --text-primary:  #eceef3;
    --text-secondary:#9aa0b8;
    --text-muted:    #5d6380;

    /* ── 主题色 ── */
    --accent:         #5b7cff;
    --accent-hover:   #7d96ff;
    --accent-bg:      rgba(91,124,255,0.1);
    --accent-bg-hover:rgba(91,124,255,0.18);
    --accent-glow:    rgba(91,124,255,0.25);

    --green:          #34d399;
    --green-bg:       rgba(52,211,153,0.1);
    --green-glow:     rgba(52,211,153,0.25);

    --red:            #f87171;
    --red-hover:      #fca5a5;
    --red-bg:         rgba(248,113,113,0.1);
    --red-glow:       rgba(248,113,113,0.3);

    --orange:         #fb923c;
    --violet:         #a78bfa;

    /* ── 圆角体系 ── */
    --radius-xs:      6px;
    --radius-sm:      10px;
    --radius-md:      14px;
    --radius-lg:      20px;
    --radius-xl:      28px;
    --radius-full:    9999px;

    /* ── 阴影 ── */
    --shadow-sm:      0 1px 3px rgba(0,0,0,0.35);
    --shadow-md:      0 4px 16px rgba(0,0,0,0.45);
    --shadow-lg:      0 8px 32px rgba(0,0,0,0.55);
    --shadow-xl:      0 16px 48px rgba(0,0,0,0.6);

    /* ── 动效 ── */
    --transition:     0.22s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow:0.35s cubic-bezier(0.4, 0, 0.2, 1);

    /* ── 尺寸 ── */
    --toolbar-h:      76px;
    --topbar-h:       44px;
}

/* ═══════════════════════════════════════════════════════════════════
   全局基础
   ═══════════════════════════════════════════════════════════════════ */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html, body {
    width:100%; height:100%; overflow:hidden;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    font-size: 14px;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}
::selection { background: var(--accent); color: #fff; }

/* Scrollbar */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.08); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.15); }

/* ═══════════════════════════════════════════════════════════════════
   SVG 图标库
   ═══════════════════════════════════════════════════════════════════ */
.toolbar-svg-icon {
    width: 22px; height: 22px; flex-shrink: 0;
    opacity: 0.85; transition: opacity var(--transition);
}
.toolbar-btn:hover .toolbar-svg-icon,
.toolbar-btn.on .toolbar-svg-icon,
.toolbar-btn.active-green .toolbar-svg-icon { opacity: 1; }

/* ═══════════════════════════════════════════════════════════════════
   加入面板
   ═══════════════════════════════════════════════════════════════════ */
#join-overlay {
    position: fixed; inset: 0; z-index: 99999;
    display: flex; align-items: center; justify-content: center;
    background: radial-gradient(ellipse at 50% 0%, #111827 0%, #090b10 50%, #060810 100%);
}
#join-overlay::before {
    content: '';
    position: absolute; inset: 0;
    background:
        radial-gradient(ellipse at 35% 25%, rgba(91,124,255,0.06) 0%, transparent 55%),
        radial-gradient(ellipse at 65% 65%, rgba(52,211,153,0.04) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 80%, rgba(167,139,250,0.03) 0%, transparent 45%);
    pointer-events: none;
}
.join-wrapper {
    position: relative;
    animation: joinFadeIn 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}
@keyframes joinFadeIn {
    from { opacity: 0; transform: translateY(20px) scale(0.97); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}
.join-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 48px 44px 40px;
    width: 440px; max-width: 94vw;
    box-shadow: var(--shadow-xl), 0 0 0 1px rgba(255,255,255,0.03);
    text-align: center;
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
}
.join-logo {
    display: flex; align-items: center; justify-content: center;
    gap: 10px; margin-bottom: 2px;
}
.join-logo-icon {
    width: 40px; height: 40px;
    background: linear-gradient(135deg, #5b7cff, #a78bfa);
    border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    color: #fff; font-size: 22px;
    box-shadow: 0 4px 15px rgba(91,124,255,0.35);
}
.join-logo h1 {
    font-size: 34px; font-weight: 700; letter-spacing: -0.5px;
    background: linear-gradient(135deg, #8ba5ff 0%, #c4b5fd 50%, #8ba5ff 100%);
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    line-height: 1.1;
}
.join-desc {
    font-size: 16px; color: var(--text-muted);
    margin-bottom: 36px; letter-spacing: 0.2px;
}
.join-field { margin-bottom: 18px; text-align: left; }
.join-field label {
    display: block; font-size: 14px; color: var(--text-secondary);
    margin-bottom: 8px; font-weight: 600; letter-spacing: 0.5px;
    text-transform: uppercase;
}
.join-input-wrap {
    display: flex; align-items: center; gap: 10px;
    background: var(--bg-secondary);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm); padding: 0 14px;
    transition: all var(--transition);
}
.join-input-wrap:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-bg);
    background: var(--bg-tertiary);
}
.join-input-icon { font-size: 16px; flex-shrink: 0; opacity: 0.45; }
.join-input-wrap input {
    flex: 1; padding: 13px 0; border: none; background: transparent;
    color: var(--text-primary); font-size: 15px; outline: none;
    letter-spacing: 0.2px;
}
.join-input-wrap input::placeholder { color: var(--text-muted); }
.join-btn {
    width: 100%; padding: 14px; margin-top: 8px; border: none;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, #5b7cff, #6366f1);
    color: #fff; font-size: 16px;
    font-weight: 600; cursor: pointer; letter-spacing: 0.3px;
    transition: all var(--transition);
    box-shadow: 0 4px 18px rgba(91,124,255,0.35);
    position: relative; overflow: hidden;
}
.join-btn::after {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(135deg, transparent 30%, rgba(255,255,255,0.08) 50%, transparent 70%);
    transition: opacity var(--transition); opacity: 0;
}
.join-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 24px rgba(91,124,255,0.45); }
.join-btn:hover::after { opacity: 1; }
.join-btn:active { transform: translateY(0); box-shadow: 0 2px 10px rgba(91,124,255,0.3); }
.join-btn:disabled { opacity: 0.5; cursor: default; transform: none; box-shadow: none; }
.join-btn:disabled::after { opacity: 0; }
.join-error { color: var(--red); font-size: 13px; margin-top: 14px; min-height: 20px; }
.join-features { margin-top: 28px; display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }
.join-features span {
    font-size: 13px; color: var(--text-muted);
    padding: 5px 12px; border-radius: var(--radius-full);
    background: rgba(255,255,255,0.02);
    border: 1px solid rgba(255,255,255,0.05);
    letter-spacing: 0.2px;
}

/* 登录页底部公司 logo + 文字（logo 为外部 jpg 文件：/static/images/footer-logo.jpg） */
.join-footer-brand {
    display: flex; align-items: center; justify-content: center;
    gap: 12px; margin-top: 28px;
}
.join-footer-brand img {
    width: 45px; height: 45px; object-fit: contain;
    filter: drop-shadow(0 2px 5px rgba(0,0,0,0.25));
}
.join-footer-brand .brand-name {
    font-size: 25px; font-weight: 700; letter-spacing: -0.5px;
    background: linear-gradient(135deg, #8ba5ff 0%, #c4b5fd 50%, #8ba5ff 100%);
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    line-height: 1.1;
}

/* ═══════════════════════════════════════════════════════════════════
   会议主界面
   ═══════════════════════════════════════════════════════════════════ */
#meeting-app {
    position: fixed; inset: 0; display: none;
    flex-direction: column;
    background: var(--bg-primary);
}
#meeting-app.active { display: flex; animation: appFadeIn 0.35s ease; }
@keyframes appFadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

/* ── 顶部信息栏 ── */
#meeting-topbar {
    display: flex; align-items: center; justify-content: space-between;
    height: var(--topbar-h); padding: 0 20px;
    background: rgba(9,11,16,0.92);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0; z-index: 100;
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
}
.topbar-left, .topbar-center, .topbar-right {
    display: flex; align-items: center; gap: 8px;
}
.topbar-lock {
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--green);
    box-shadow: 0 0 6px var(--green-glow);
    flex-shrink: 0;
}
.topbar-title {
    font-size: 13px; font-weight: 600; color: var(--text-primary);
    max-width: 180px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
    opacity: 0.9;
}
.topbar-sep {
    width: 1px; height: 14px;
    background: var(--border-light); border-radius: 1px;
    margin: 0 2px;
}
.topbar-timer {
    font-size: 13px; color: var(--text-secondary);
    font-variant-numeric: tabular-nums; letter-spacing: 0.5px;
    font-weight: 500;
}
.topbar-count {
    font-size: 13px; color: var(--text-secondary);
    display: flex; align-items: center; gap: 5px;
    font-weight: 500;
}
.topbar-member-icon {
    width: 16px; height: 16px; opacity: 0.6;
}
.topbar-net {
    display: flex; align-items: center; gap: 4px;
    color: var(--green); font-size: 12px;
}

/* 布局切换按钮 */
.topbar-layout-btn {
    width: 34px; height: 32px;
    border: 1.5px solid transparent;
    border-radius: var(--radius-xs);
    background: transparent; color: var(--text-muted);
    font-size: 16px; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: all var(--transition);
}
.topbar-layout-btn:hover {
    background: var(--bg-hover); color: var(--text-primary);
    border-color: var(--border);
}
.topbar-layout-btn.active {
    background: var(--accent-bg); border-color: var(--accent);
    color: var(--accent);
    box-shadow: 0 0 8px rgba(91,124,255,0.15);
}

/* ── 主内容区 ── */
#meeting-main {
    flex: 1; position: relative; overflow: hidden;
    background: #070910;
    min-height: 0;
}
#videoPanel {
    position: absolute; inset: 0;
    transition: inset var(--transition-slow);
}

/* ── 视频网格 ── */
#video-grid {
    position: absolute;
    top: 6px; left: 6px; right: 6px; bottom: 6px;
    display: grid; gap: 8px;
    background: transparent;
    overflow: hidden;
    box-sizing: border-box;
    transition: all var(--transition-slow);
}
.video-tile {
    position: relative; background: #10131e;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 2px solid transparent;
    transition: border-color 0.2s, box-shadow 0.2s;
    width: 100%; height: 100%;
    min-width: 0; min-height: 0;
}
.video-tile:hover { border-color: rgba(255,255,255,0.1); }
.video-tile.speaking {
    border-color: var(--green);
    box-shadow: 0 0 0 3px var(--green-bg), 0 0 12px rgba(52,211,153,0.1);
}
.video-tile-video {
    width: 100%; height: 100%; object-fit: cover; display: block;
    background: #000;
}
.video-tile-avatar {
    display: none; position: absolute; inset: 0;
    align-items: center; justify-content: center;
    background: linear-gradient(135deg, #1a1f35 0%, #141824 100%);
}
.video-tile-avatar-icon {
    width: clamp(64px, 12vw, 96px);
    height: clamp(64px, 12vw, 96px);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 4px 20px rgba(0,0,0,0.35);
    overflow: hidden;
    transition: transform 0.2s ease;
}
.video-tile-avatar-icon svg {
    width: 55%; height: 55%;
}
.video-tile-avatar-icon img {
    width: 100%; height: 100%;
    object-fit: cover;
}
.video-tile-name {
    position: absolute; bottom: 10px; left: 10px;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: #fff; font-size: 12px; font-weight: 500;
    padding: 5px 12px; border-radius: var(--radius-full);
    pointer-events: none; max-width: 75%;
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
    border: 1px solid rgba(255,255,255,0.06);
}
.video-tile-mute {
    position: absolute; top: 10px; left: 10px;
    font-size: 14px;
    background: rgba(248,113,113,0.9);
    padding: 4px 10px; border-radius: var(--radius-xs);
    pointer-events: none; display: none; align-items: center;
    color: #fff;
}
.video-tile-you {
    position: absolute; top: 10px; right: 10px;
    background: rgba(91,124,255,0.85); color: #fff;
    font-size: 11px; font-weight: 600;
    padding: 4px 10px; border-radius: var(--radius-xs);
    pointer-events: none;
    letter-spacing: 0.3px;
}

/* ═══════════════════════════════════════════════════════════════════
   底部工具栏
   ═══════════════════════════════════════════════════════════════════ */
#meeting-toolbar {
    height: var(--toolbar-h); flex-shrink: 0;
    display: flex; flex-direction: column;
    background: rgba(9,11,16,0.94);
    border-top: 1px solid var(--border);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    z-index: 200;
}
.toolbar-inner {
    height: 100%; display: flex; align-items: center;
    padding: 0 20px;
}
.toolbar-left {
    flex: 1; display: flex; align-items: center; min-width: 0;
}
.toolbar-meeting-name {
    font-size: 12px; color: var(--text-muted); font-weight: 500;
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
    letter-spacing: 0.2px;
}
.toolbar-center {
    display: flex; align-items: center; gap: 2px; flex-shrink: 0;
}
.toolbar-right {
    flex: 1; display: flex; align-items: center; justify-content: flex-end;
    gap: 6px; min-width: 0;
}

/* 工具栏按钮 */
.toolbar-btn {
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    gap: 6px; padding: 10px 16px; min-width: 68px; height: 62px;
    border: none; border-radius: var(--radius-sm);
    background: transparent; color: var(--text-secondary);
    cursor: pointer; transition: all var(--transition);
    position: relative;
}
.toolbar-btn:hover { background: var(--bg-hover); color: var(--text-primary); }
.toolbar-btn-icon {
    font-size: 22px; line-height: 1;
    transition: transform 0.15s ease;
    display: flex; align-items: center; justify-content: center;
}
.toolbar-btn:hover .toolbar-btn-icon { transform: scale(1.08); }
.toolbar-btn-label { font-size: 12px; line-height: 1; white-space: nowrap; font-weight: 500; letter-spacing: 0.2px; }

/* 激活/危险状态 — 更精细的现代表达 */
.toolbar-btn.danger { color: var(--red); }
.toolbar-btn.danger:hover { background: var(--red-bg); }
.toolbar-btn.active {
    color: var(--red);
    background: var(--red-bg);
}
.toolbar-btn.active:hover { background: rgba(248,113,113,0.18); }
.toolbar-btn.active-green {
    color: var(--green);
}
.toolbar-btn.active-green:hover { background: var(--green-bg); }
.toolbar-btn.on {
    color: var(--accent);
}
.toolbar-btn.on:hover { background: var(--accent-bg); }

/* 按钮激活指示器（底部小点） */
.toolbar-btn.active::after,
.toolbar-btn.on::after,
.toolbar-btn.active-green::after {
    content: '';
    position: absolute; bottom: 6px; left: 50%;
    width: 4px; height: 4px; border-radius: 50%;
    transform: translateX(-50%);
}
.toolbar-btn.active::after       { background: var(--red); }
.toolbar-btn.on::after           { background: var(--accent); }
.toolbar-btn.active-green::after { background: var(--green); }

/* 结束按钮 */
.toolbar-btn-end {
    background: var(--red) !important; color: #fff !important;
    border-radius: var(--radius-full) !important;
    padding: 10px 22px !important; font-weight: 600; min-width: auto;
    box-shadow: 0 2px 12px var(--red-glow);
    letter-spacing: 0.3px;
}
.toolbar-btn-end:hover {
    background: var(--red-hover) !important;
    box-shadow: 0 4px 18px var(--red-glow);
    transform: translateY(-1px);
}
.toolbar-btn-end .toolbar-btn-icon { font-size: 18px; }

/* 更多按钮 */
.toolbar-btn-more {
    border-radius: var(--radius-sm); padding: 10px 12px; min-width: auto;
}

/* 聊天未读红点 */
.chat-unread-dot {
    position: absolute; top: 6px; right: 10px;
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--red);
    box-shadow: 0 0 0 3px rgba(9,11,16,0.9);
    animation: dotPulse 2s ease infinite;
}
@keyframes dotPulse {
    0%, 100% { transform: scale(1); }
    50%      { transform: scale(1.3); }
}

/* ═══════════════════════════════════════════════════════════════════
   侧边面板通用
   ═══════════════════════════════════════════════════════════════════ */
.side-panel {
    position: fixed; top: var(--topbar-h); bottom: var(--toolbar-h);
    background: var(--bg-secondary);
    border-left: 1px solid var(--border);
    z-index: 300; display: none; flex-direction: column;
    box-shadow: var(--shadow-lg);
    animation: panelSlideIn 0.26s cubic-bezier(0.22, 1, 0.36, 1);
}
@keyframes panelSlideIn {
    from { transform: translateX(16px); opacity: 0; }
    to   { transform: translateX(0); opacity: 1; }
}
.side-panel.closing {
    animation: panelSlideOut 0.18s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}
@keyframes panelSlideOut {
    from { transform: translateX(0); opacity: 1; }
    to   { transform: translateX(16px); opacity: 0; }
}

.side-panel-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 14px 18px; border-bottom: 1px solid var(--border);
    font-size: 14px; font-weight: 600; flex-shrink: 0;
    color: var(--text-primary);
    letter-spacing: 0.2px;
}
.side-panel-header .side-panel-close {
    width: 30px; height: 30px; border-radius: var(--radius-xs);
    border: none; background: transparent;
    color: var(--text-muted); font-size: 16px;
    cursor: pointer; display: flex; align-items: center;
    justify-content: center; transition: all var(--transition);
}
.side-panel-header .side-panel-close:hover {
    background: var(--bg-hover); color: var(--text-primary);
}
.side-panel-body {
    flex: 1; overflow-y: auto; padding: 8px; min-height: 0;
}
.side-panel-body::-webkit-scrollbar { width: 4px; }
.side-panel-body::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.06); border-radius: 4px; }
.side-panel-footer {
    padding: 12px; border-top: 1px solid var(--border); flex-shrink: 0;
}

/* ── 参与者面板 ── */
#participants-panel { width: 280px; right: 0; }
#participants-panel .participant-item {
    display: flex; align-items: center; gap: 12px;
    padding: 10px 10px; border-radius: var(--radius-sm);
    margin-bottom: 2px; transition: background var(--transition);
    cursor: default;
}
#participants-panel .participant-item:hover { background: var(--bg-hover); }
#participants-panel .participant-avatar {
    width: 40px; height: 40px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 16px; font-weight: 700; color: #fff; flex-shrink: 0;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}
#participants-panel .participant-avatar svg {
    width: 55%; height: 55%;
}
#participants-panel .participant-avatar img {
    width: 100%; height: 100%;
    object-fit: cover;
}
#participants-panel .participant-info { flex: 1; min-width: 0; }
#participants-panel .participant-name {
    font-size: 13px; font-weight: 500;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
#participants-panel .participant-status {
    font-size: 11px; color: var(--text-muted); margin-top: 1px;
}
#participants-panel .participant-icons { font-size: 14px; display: flex; gap: 4px; flex-shrink: 0; }

/* ── 聊天面板 ── */
#chat-panel { width: 320px; right: 0; }

/* ═══════════════════════════════════════════════════════════════════
   共享空间面板
   ═══════════════════════════════════════════════════════════════════ */
#model-viewer-panel {
    position: fixed; left: 50px; top: 60px;
    width: 640px; height: 480px;
    min-width: 320px; min-height: 260px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    z-index: 400;
    display: none;
    flex-direction: column;
    box-shadow: 0 16px 48px rgba(0,0,0,0.6), 0 0 0 1px rgba(255,255,255,0.03);
    /* [切换闪烁修复] 移除入场淡入动画 mvFadeIn：
       原动画从 opacity:0 开始，面板显示时前 0.3s 半透明，
       会露出底层视频页面造成闪烁。改为直接显示，不透明。 */
}
#model-viewer-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 10px 16px;
    background: linear-gradient(180deg, rgba(255,255,255,0.03) 0%, transparent 100%);
    background-color: var(--bg-tertiary);
    cursor: move; color: var(--text-primary);
    font-size: 13px; font-weight: 600;
    user-select: none; flex-shrink: 0;
    border-bottom: 1px solid var(--border);
    letter-spacing: 0.2px;
}
#model-viewer-body {
    flex: 1; position: relative;
    background: radial-gradient(ellipse at 50% 50%, #0f131e 0%, #070910 100%);
    display: flex; align-items: center; justify-content: center;
    color: var(--text-muted); font-size: 13px;
    min-height: 0; overflow: hidden;
}
#mv-friend-bar {
    display: flex; align-items: center; gap: 8px;
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border);
    overflow-x: auto; flex-shrink: 0; min-height: 56px;
}
#mv-friend-bar::-webkit-scrollbar { height: 3px; }
#mv-friend-bar::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.08); border-radius: 2px; }
#mv-friend-bar::-webkit-scrollbar-track { background: transparent; }
.mv-resize { position: absolute; z-index: 10; }

/* 共享空间入口按钮 */
#model-viewer-entry-btn {
    position: fixed; left: 50%; bottom: 92px;
    transform: translateX(-50%);
    z-index: 500; padding: 8px 22px;
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    background: var(--bg-card); color: var(--text-primary);
    cursor: pointer; font-size: 13px; font-weight: 600;
    box-shadow: var(--shadow-md);
    display: none; align-items: center; gap: 8px;
    transition: all var(--transition);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    letter-spacing: 0.2px;
}
#model-viewer-entry-btn:hover {
    background: var(--bg-hover); border-color: var(--accent);
    box-shadow: var(--shadow-lg), 0 0 16px rgba(91,124,255,0.12);
    transform: translateX(-50%) translateY(-2px);
}

/* ═══════════════════════════════════════════════════════════════════
   问AI / AI角色 左侧面板
   ═══════════════════════════════════════════════════════════════════ */
#ask-ai-panel, #ai-chat-panel {
    position: fixed; top: var(--topbar-h); bottom: var(--toolbar-h);
    z-index: 91500; display: none; flex-direction: column;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    animation: panelSlideInLeft 0.26s cubic-bezier(0.22, 1, 0.36, 1);
}
#ask-ai-panel  { left: 0; width: 340px; }
#ai-chat-panel { left: 340px; width: 340px; }
@keyframes panelSlideInLeft {
    from { transform: translateX(-16px); opacity: 0; }
    to   { transform: translateX(0); opacity: 1; }
}

/* ═══════════════════════════════════════════════════════════════════
   画中画悬浮条
   ═══════════════════════════════════════════════════════════════════ */
#pip-floating-bar {
    position: fixed; right: 24px; top: var(--topbar-h);
    transform: translateY(8px);
    z-index: 500;
}

/* ═══════════════════════════════════════════════════════════════════
   Toast 通知
   ═══════════════════════════════════════════════════════════════════ */
#toast-container {
    position: fixed; top: 54px; right: 20px; z-index: 999999;
    display: flex; flex-direction: column; gap: 8px; pointer-events: none;
}
.toast-item {
    padding: 14px 22px; border-radius: var(--radius-sm);
    font-size: 13px; font-weight: 500; color: #fff;
    box-shadow: var(--shadow-md);
    pointer-events: auto; max-width: 360px;
    animation: toastSlideIn 0.3s cubic-bezier(0.22, 1, 0.36, 1);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    letter-spacing: 0.2px;
    border: 1px solid rgba(255,255,255,0.08);
}
@keyframes toastSlideIn {
    from { opacity: 0; transform: translateX(32px); }
    to   { opacity: 1; transform: translateX(0); }
}
.toast-info    { background: rgba(91,124,255,0.88); }
.toast-success { background: rgba(52,211,153,0.88); }
.toast-warning { background: rgba(251,146,60,0.88); }
.toast-error   { background: rgba(248,113,113,0.88); }

/* ═══════════════════════════════════════════════════════════════════
   好友列表 / 浮动控制栏 占位
   ═══════════════════════════════════════════════════════════════════ */
#friend-list-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
}
#floating-control-bar {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}