/* ----- 深色模式变量 (默认) ----- */
:root {
    --bg-color: #0c0f15;
    --sidebar-bg: #10131c;
    --card-bg: #1a1e2a;
    --card-hover: #252a38;
    --input-bg: #191e2a;
    --border-light: #2a2f3d;
    --text-main: #edf2f7;
    --text-sub: #a0aec0;
    --text-muted: #718096;
    --accent-blue: #7aa9ff;
    --accent-blue-hover: #5a89df;
    --sidebar-width: 300px;
    --sidebar-collapsed-width: 68px;
    --transition-smooth: cubic-bezier(0.05, 0.7, 0.1, 1);
}

/* 浅色模式变量 */
body.light {
    --bg-color: #f7f9fc;
    --sidebar-bg: #ffffff;
    --card-bg: #ffffff;
    --card-hover: #f1f5f9;
    --input-bg: #ffffff;
    --border-light: #e2e8f0;
    --text-main: #1e293b;
    --text-sub: #475569;
    --text-muted: #94a3b8;
    --accent-blue: #1a73e8;
    --accent-blue-hover: #1557b0;
}

@media (prefers-color-scheme: light) {
    body.system {
        --bg-color: #f7f9fc;
        --sidebar-bg: #ffffff;
        --card-bg: #ffffff;
        --card-hover: #f1f5f9;
        --input-bg: #ffffff;
        --border-light: #e2e8f0;
        --text-main: #1e293b;
        --text-sub: #475569;
        --text-muted: #94a3b8;
        --accent-blue: #1a73e8;
        --accent-blue-hover: #1557b0;
    }
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family:
        "Google Sans", "Noto Sans SC", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    height: 100vh;
    display: flex;
    overflow: hidden;
    transition:
        background 0.2s,
        color 0.2s;
}

/* 隐藏所有滚动条，但保留滚动功能 */
*::-webkit-scrollbar {
    display: none;
}
* {
    scrollbar-width: none;
    -ms-overflow-style: none;
}

/* Material Icons 样式覆盖 */
.material-icons-outlined {
    font-size: 20px;
}

/* 侧边栏 */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--sidebar-bg);
    height: 100%;
    display: flex;
    flex-direction: column;
    transition: width 0.3s var(--transition-smooth);
    overflow: hidden;
    z-index: 100;
    border-right: 1px solid var(--border-light);
}

.sidebar-header {
    position: relative;
    height: 64px;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 18px;
    font-weight: 500;
    transition: opacity 0.2s;
    cursor: pointer;
}

.logo-icon {
    width: 28px;
    height: 32px;
    flex-shrink: 0;
}

.brand-text {
    font-size: 18px;
    font-weight: 500;
    color: var(--text-main);
}

.collapse-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-sub);
}
.collapse-btn:hover {
    background-color: var(--card-hover);
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
}
.sidebar.collapsed .sidebar-header {
    justify-content: center;
    padding: 0;
}
.sidebar.collapsed .brand-text {
    display: none;
}
.sidebar.collapsed .collapse-btn {
    display: none;
}

.sidebar.collapsed .sidebar-header {
    cursor: pointer;
}
.sidebar.collapsed .sidebar-brand {
    position: relative;
}
.sidebar.collapsed .sidebar-brand .logo-icon {
    transition: opacity 0.15s;
}
.sidebar.collapsed .sidebar-header:hover .sidebar-brand .logo-icon {
    opacity: 0;
}
.sidebar.collapsed .sidebar-brand::after {
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23c4c7c5'%3E%3Cpath d='M3 18h18v-2H3v2zm0-5h18v-2H3v2zm0-7v2h18V6H3z'/%3E%3C/svg%3E");
    background-size: contain;
    background-repeat: no-repeat;
    opacity: 0;
    transition: opacity 0.15s;
    pointer-events: none;
}
.sidebar.collapsed .sidebar-header:hover .sidebar-brand::after {
    opacity: 1;
}
.sidebar.collapsed .sidebar-header:hover .sidebar-brand {
    background-color: var(--card-hover);
    padding: 10px;
    border-radius: 50%;
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: 16px 12px;
}
.sidebar.collapsed .sidebar-content {
    padding: 16px 8px;
}

.group-item {
    margin-bottom: 20px;
}
.group-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-sub);
    cursor: pointer;
    border-radius: 10px;
    white-space: nowrap;
}
.group-header:hover {
    background-color: var(--card-hover);
}
.group-title {
    display: flex;
    align-items: center;
    gap: 8px;
}
.group-count {
    font-size: 11px;
    color: var(--text-muted);
}
.group-items {
    padding-left: 12px;
    margin-top: 6px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.sidebar.collapsed .group-header {
    justify-content: center;
    padding: 8px 0;
}
.sidebar.collapsed .group-header .group-name,
.sidebar.collapsed .group-header .group-count,
.sidebar.collapsed .group-header .material-icons-outlined:last-child {
    display: none;
}
.sidebar.collapsed .group-header .group-title {
    margin: 0;
}
.sidebar.collapsed .group-items {
    display: none;
}

.playlist-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 12px;
    border-radius: 10px;
    cursor: pointer;
    color: var(--text-main);
    font-size: 13px;
    white-space: nowrap;
    transition: background 0.1s;
}
.playlist-item:hover {
    background-color: var(--card-hover);
}
.playlist-info {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
}
.playlist-actions {
    display: flex;
    gap: 6px;
}
.icon-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-sub);
}
.icon-btn:hover {
    background-color: var(--card-hover);
}
.empty-placeholder {
    color: var(--text-muted);
    font-size: 12px;
    text-align: center;
    padding: 20px 8px;
}

.sidebar-footer {
    padding: 12px;
    border-top: 1px solid var(--border-light);
}
.menu-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 10px 14px;
    border-radius: 24px;
    cursor: pointer;
    color: var(--text-main);
    font-size: 14px;
    white-space: nowrap;
}
.sidebar.collapsed .menu-item {
    justify-content: center;
    padding: 10px 0;
}
.sidebar.collapsed .menu-item .fade-text {
    display: none;
}
.menu-item:hover {
    background-color: var(--card-hover);
}

.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
    z-index: 99;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}
.sidebar-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}
.main-header {
    height: 56px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    border-bottom: 1px solid var(--border-light);
}
.mobile-header-left {
    display: none;
    align-items: center;
    gap: 8px;
}
.mobile-menu-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    border-radius: 50%;
    color: var(--text-sub);
}
.version-badge {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-sub);
    background: var(--card-hover);
    padding: 4px 12px;
    border-radius: 20px;
}
.twitter-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    transition: background 0.2s;
}
.twitter-link:hover {
    background-color: var(--card-hover);
}
.twitter-icon {
    width: 20px;
    height: 20px;
    fill: currentColor;
}
/* Twitter 颜色：深色模式白色，浅色模式黑色 */
body.dark .twitter-icon,
body.system .twitter-icon {
    fill: white;
}
body.light .twitter-icon {
    fill: black;
}

.welcome-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0 20px;
    text-align: center;
}
.welcome-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 20px;
}
.welcome-logo .logo-icon {
    width: 48px;
    height: 56px;
}
.welcome-logo .brand-text {
    font-size: 48px;
    font-weight: 700;
    background: linear-gradient(135deg, #7accff, var(--accent-blue), #ff9ebb);
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
}
.welcome-subtitle {
    font-size: 24px;
    font-weight: 500;
    color: var(--text-sub);
    margin-bottom: 48px;
}
.welcome-input-area {
    width: 100%;
    max-width: 660px;
    margin: 0 auto;
}
.welcome-input-row {
    display: flex;
    align-items: center;
    gap: 12px;
    background-color: var(--input-bg);
    border-radius: 30px;
    padding: 6px 6px 6px 20px;
    border: 1px solid var(--border-light);
}
.welcome-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-main);
    font-size: 16px;
    padding: 14px 0;
}
.welcome-send-btn,
.welcome-add-btn {
    background: none;
    border: none;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    cursor: pointer;
    color: var(--text-sub);
    display: flex;
    align-items: center;
    justify-content: center;
}
.welcome-add-btn:hover,
.welcome-send-btn:hover {
    background-color: var(--card-hover);
}

.chat-container {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 20px 0;
    display: none;
    scroll-behavior: smooth;
}
.chat-inner {
    max-width: 760px;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 24px;
    position: relative;
    margin-bottom: 32px;
}
.chat-turn {
    display: flex;
    flex-direction: column;
    gap: 12px;
    position: relative;
    scroll-margin-top: 20px;
}
.turn-marker {
    position: absolute;
    right: -40px;
    top: 20px;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background-color: var(--card-bg);
    border: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s;
    color: var(--text-sub);
}
.chat-turn:hover .turn-marker {
    opacity: 0.7;
}
.turn-marker:hover {
    opacity: 1 !important;
    background-color: var(--card-hover);
}
.turn-marker .material-icons-outlined {
    font-size: 16px;
}

.scroll-buttons {
    position: fixed;
    right: 24px;
    bottom: 100px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 50;
}
.scroll-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--card-bg);
    backdrop-filter: blur(4px);
    border: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-sub);
    transition: all 0.2s;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}
.scroll-btn:hover {
    background-color: var(--card-hover);
    transform: scale(1.05);
    color: var(--text-main);
}
.scroll-btn .material-icons-outlined {
    font-size: 20px;
}

.user-message {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 4px;
}
.user-content {
    background: var(--card-hover);
    padding: 10px 16px;
    border-radius: 18px;
    font-size: 14px;
    max-width: 540px;
    width: fit-content;
}
.assistant-message {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.assistant-label {
    font-size: 12px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}
.assistant-logo {
    width: 16px;
    height: 19px;
}

/* 视频占位容器样式 - 无边框 */
.video-placeholder-card {
    width: 100%;
    background: var(--card-bg);
    border-radius: 16px;
    overflow: hidden;
    cursor: pointer;
    transition: background 0.2s;
    border: none;
}
.video-placeholder-card:hover {
    background: var(--card-hover);
}
.video-placeholder-inner {
    aspect-ratio: 16 / 9;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    color: var(--text-sub);
}
.video-placeholder-inner .material-icons-outlined {
    font-size: 48px;
    color: var(--accent-blue);
}
.video-placeholder-title {
    font-size: 14px;
    font-weight: 500;
    text-align: center;
    padding: 0 16px 16px;
}

/* 全局播放器容器 - 无边框 */
.global-player-container {
    width: 100%;
    background: #000;
    border-radius: 16px;
    overflow: hidden;
    border: none;
}
.global-player-container .video-js,
.global-player-container .iframe-player {
    width: 100%;
    aspect-ratio: 16 / 9;
}
.video-card-info {
    padding: 12px;
    background: var(--card-bg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    border-top: 1px solid var(--border-light);
    gap: 12px;
    flex-wrap: wrap;
}
.video-actions {
    display: flex;
    gap: 8px;
}
.video-actions .material-icons-outlined {
    font-size: 18px;
}

.input-bar-container {
    flex-shrink: 0;
    background-color: var(--sidebar-bg);
    padding: 36px;
    display: flex;
    justify-content: center;
    display: none;
    border-top: none;
}
.input-box-wrapper {
    width: 100%;
    max-width: 660px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.input-row {
    display: flex;
    align-items: center;
    gap: 8px;
    background-color: var(--input-bg);
    border-radius: 30px;
    padding: 6px 6px 6px 20px;
    border: 1px solid var(--border-light);
}
.main-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-main);
    font-size: 16px;
    padding: 12px 0;
}
.send-btn,
.add-btn {
    background: none;
    border: none;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-sub);
}
.send-btn:hover,
.add-btn:hover {
    background-color: var(--card-hover);
}
.send-btn-active {
    color: var(--accent-blue);
}
.footer-tips {
    font-size: 12px;
    color: var(--text-muted);
    text-align: center;
}

/* 浮动播放器 (弹窗) - 彻底移除边框、阴影、轮廓 */
.floating-player,
.floating-backdrop {
    display: none;
}
.floating-player.active {
    display: flex;
}
.floating-backdrop.active {
    display: block;
}
.floating-player {
    position: fixed;
    width: 1280px;
    max-width: 90vw;
    background: #000;
    border-radius: 16px;
    z-index: 1000;
    flex-direction: column;
    overflow: hidden;
    opacity: 0;
    transform: scale(0.9);
    transition:
        transform 0.2s ease,
        opacity 0.2s ease;
    border: none; /* 无边框 */
    outline: none; /* 无外轮廓 */
    box-shadow: none; /* 无阴影 */
}
.floating-player.active {
    transform: scale(1);
    opacity: 1;
}
.floating-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: #000; /* 纯黑背景，与视频区域一致 */
    color: white;
}
.close-float {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
}
.floating-video {
    aspect-ratio: 16 / 9;
}
/* 确保视频播放器本身也没有边框 */
.floating-video .video-js,
.floating-video .iframe-player {
    border: none;
    outline: none;
}

#settingsMenu {
    position: fixed;
    bottom: 70px;
    left: 20px;
    background: var(--card-bg);
    border-radius: 24px;
    width: 260px;
    z-index: 200;
    display: none;
    flex-direction: column;
    border: 1px solid var(--border-light);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}
.settings-menu-item {
    padding: 12px 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: var(--text-main);
    transition: background 0.1s;
}
.settings-menu-item:hover {
    background-color: var(--card-hover);
}
.settings-divider {
    height: 1px;
    background: var(--border-light);
    margin: 4px 0;
}
.theme-submenu {
    padding-left: 32px;
    display: none;
    flex-direction: column;
    gap: 8px;
    background: var(--card-bg);
}
.theme-option {
    padding: 8px 12px;
    font-size: 13px;
    cursor: pointer;
    border-radius: 12px;
    color: var(--text-sub);
    display: flex;
    align-items: center;
    gap: 10px;
}
.theme-option:hover {
    background-color: var(--card-hover);
}
.theme-option.active {
    color: var(--accent-blue);
    font-weight: 500;
}

@media (max-width: 1024px) {
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        transform: translateX(-100%);
        transition: transform 0.3s;
        width: 280px !important;
        z-index: 101;
    }
    .sidebar.mobile-open {
        transform: translateX(0);
    }
    .mobile-header-left {
        display: flex;
    }
    .welcome-logo .logo-icon {
        width: 36px;
        height: 42px;
    }
    .welcome-logo .brand-text {
        font-size: 36px;
    }
    .welcome-subtitle {
        font-size: 18px;
    }
    .turn-marker {
        right: -30px;
        width: 24px;
        height: 24px;
    }
    .scroll-buttons {
        right: 16px;
        bottom: 80px;
    }
    .scroll-btn {
        width: 32px;
        height: 32px;
    }
    .input-bar-container {
        padding: 24px;
    }
    .floating-player {
        width: 95vw;
    }
}