/* ============================================
   房地产英语对话 - 深色主题
   Real Estate English Dialogues - Dark Theme
   ============================================ */

/* 全局变量 */
:root {
    /* 深色背景色系 */
    --bg-primary: #1a1d23;
    --bg-secondary: #22262e;
    --bg-tertiary: #2a2f38;
    --bg-hover: #323943;

    /* 文字颜色 */
    --text-primary: #e4e7eb;
    --text-secondary: #a0a5b1;
    --text-muted: #6b7280;

    /* 边框与分隔线 */
    --border-color: #374151;
    --divider: #2d3340;

    /* 品牌色 - 柔和统一 */
    --color-a: #60a5fa;      /* Agent - 蓝色 (男声) */
    --color-b: #f472b6;      /* Guest - 粉色 (女声) */
    --color-accent: #34d399; /* 强调色 - 绿色 */
    --color-warning: #fbbf24;
    --color-error: #f87171;

    /* 尺寸 */
    --sidebar-width: 360px;
    --control-height: 56px;

    /* 圆角与阴影 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.15);
}

/* 重置与基础 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow: hidden;
    height: 100vh;
}

/* 主容器 */
.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* ---------- 左侧边栏 ---------- */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--divider);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid var(--divider);
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
}

.sidebar-header h1 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.sidebar-header .subtitle {
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* 区块样式 */
.section {
    padding: 16px;
    border-bottom: 1px solid var(--divider);
}

.section h2 {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

/* 场景列表 */
.scene-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
    max-height: 280px;
    overflow-y: auto;
}

.scene-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: var(--bg-tertiary);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
}

.scene-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-color);
}

.scene-btn.active {
    background: rgba(96, 165, 250, 0.15);
    border-color: var(--color-a);
    color: var(--color-a);
}

.scene-btn .scene-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 22px;
    height: 22px;
    padding: 0 6px;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    font-size: 11px;
    font-weight: 600;
    color: var(--text-muted);
}

.scene-btn.active .scene-num {
    background: var(--color-a);
    color: white;
}

.scene-btn .scene-title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* 词汇面板 */
.vocab-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border-bottom: none;
}

.vocab-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.vocab-header h2 {
    margin-bottom: 0;
}

.vocab-count {
    font-size: 12px;
    color: var(--text-muted);
    background: var(--bg-tertiary);
    padding: 2px 8px;
    border-radius: 10px;
}

.search-box {
    margin-bottom: 12px;
}

.search-box input {
    width: 100%;
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 13px;
    outline: none;
    transition: border-color 0.2s;
}

.search-box input:focus {
    border-color: var(--color-a);
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.vocab-list {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-content: flex-start;
}

.vocab-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--bg-tertiary);
    border-radius: 20px;
    font-size: 12px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.vocab-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.vocab-item .star {
    color: var(--color-warning);
    font-size: 10px;
    cursor: pointer;
}

/* ---------- 主内容区 ---------- */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* 控制栏 */
.control-bar {
    height: var(--control-height);
    min-height: var(--control-height);
    padding: 0 24px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--divider);
    display: flex;
    align-items: center;
    gap: 24px;
    flex-shrink: 0;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.control-group label {
    font-size: 13px;
    color: var(--text-secondary);
    white-space: nowrap;
}

.control-group select {
    padding: 6px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 13px;
    cursor: pointer;
    outline: none;
}

.control-group select:focus {
    border-color: var(--color-a);
}

.control-btn {
    padding: 8px 14px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.control-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--text-muted);
}

.control-btn.active {
    background: rgba(52, 211, 153, 0.15);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.control-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 说话者指示器 */
.speaker-indicator {
    margin-left: auto;
}

.speaker-badge {
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    transition: all 0.2s ease;
}

.speaker-badge.hidden {
    opacity: 0.2;
    transform: scale(0.9);
}

.speaker-a {
    background: rgba(96, 165, 250, 0.15);
    color: var(--color-a);
    border: 1px solid rgba(96, 165, 250, 0.3);
}

.speaker-b {
    background: rgba(244, 114, 182, 0.15);
    color: var(--color-b);
    border: 1px solid rgba(244, 114, 182, 0.3);
}

/* 对话容器 */
.dialog-container {
    flex: 1;
    overflow-y: auto;
    padding: 32px 48px 64px;
    scroll-behavior: smooth;
}

.scene-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.scene-roles {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 32px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--divider);
}

.scene-roles .role-a {
    color: var(--color-a);
    font-weight: 600;
}

.scene-roles .role-b {
    color: var(--color-b);
    font-weight: 600;
}

/* 对话行 */
.dialog-line {
    display: flex;
    margin-bottom: 16px;
    padding: 14px 18px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--divider);
    transition: all 0.2s ease;
    cursor: pointer;
}

.dialog-line:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-color);
    transform: translateX(4px);
}

.dialog-line.playing {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(52, 211, 153, 0.1);
}

.dialog-line.speaker-a {
    border-left: 3px solid var(--color-a);
}

.dialog-line.speaker-b {
    border-left: 3px solid var(--color-b);
}

.dialog-line.current {
    background: var(--bg-tertiary);
    box-shadow: var(--shadow);
}

.dialog-line.current.speaker-a {
    border-color: var(--color-a);
    background: linear-gradient(90deg, rgba(96, 165, 250, 0.08) 0%, var(--bg-secondary) 100%);
}

.dialog-line.current.speaker-b {
    border-color: var(--color-b);
    background: linear-gradient(90deg, rgba(244, 114, 182, 0.08) 0%, var(--bg-secondary) 100%);
}

.line-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    margin-right: 14px;
    flex-shrink: 0;
}

.dialog-line.speaker-a .line-number {
    background: rgba(96, 165, 250, 0.15);
    color: var(--color-a);
}

.dialog-line.speaker-b .line-number {
    background: rgba(244, 114, 182, 0.15);
    color: var(--color-b);
}

.line-content {
    flex: 1;
}

.line-speaker {
    display: inline-block;
    font-size: 14px;
    font-weight: 700;
    margin-right: 8px;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
}

.line-speaker.a {
    color: var(--color-a);
    background: rgba(96, 165, 250, 0.1);
}

.line-speaker.b {
    color: var(--color-b);
    background: rgba(244, 114, 182, 0.1);
}

.line-text {
    display: inline;
    font-size: 16px;
    color: var(--text-primary);
    line-height: 1.7;
}

.line-translation {
    display: block;
    margin-top: 6px;
    font-size: 14px;
    color: var(--text-muted);
    padding-left: 60px;
    border-left: 2px solid var(--divider);
}

/* 隐藏英文模式 */
.hide-english .line-text {
    visibility: hidden;
}

.hide-english .line-translation {
    border-left: none;
    padding-left: 0;
}

/* 播放动画 */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.dialog-line.playing .line-text {
    animation: pulse 1.5s ease-in-out infinite;
}

/* 滚动条 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .sidebar {
        width: 300px;
        min-width: 300px;
    }

    .dialog-container {
        padding: 24px;
    }

    .control-bar {
        padding: 0 16px;
        gap: 16px;
    }
}

@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        max-height: 40vh;
        border-right: none;
        border-bottom: 1px solid var(--divider);
    }

    .scene-list {
        max-height: 120px;
    }

    .vocab-section {
        max-height: 30vh;
    }

    .dialog-container {
        padding: 16px;
    }

    .control-bar {
        flex-wrap: wrap;
        height: auto;
        padding: 12px 16px;
    }

    .control-group.buttons {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
    }

    .speaker-indicator {
        width: 100%;
        justify-content: center;
        margin-top: 8px;
    }
}

/* 空状态 */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
    text-align: center;
    padding: 40px;
}

.empty-state .icon {
    font-size: 64px;
    margin-bottom: 20px;
    opacity: 0.5;
}

.empty-state p {
    font-size: 16px;
    line-height: 1.6;
}