/* ── 基础 ─────────────────────────────────── */
:root {
    --primary: #4f46e5;
    --primary-light: #818cf8;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --bg: #f8fafc;
    --card: #ffffff;
    --text: #1e293b;
    --text-light: #64748b;
    --border: #e2e8f0;
    --radius: 12px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* ── 导航 ─────────────────────────────────── */
.navbar {
    background: var(--card);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}
.navbar .container { display: flex; align-items: center; justify-content: space-between; }
.logo { font-size: 1.3rem; font-weight: 700; color: var(--primary); text-decoration: none; }
.nav-links a {
    color: var(--text-light);
    text-decoration: none;
    margin-left: 24px;
    font-weight: 500;
    transition: color 0.2s;
}
.nav-links a:hover { color: var(--primary); }

/* ── 主内容 ─────────────────────────────────── */
main { flex: 1; padding: 30px 20px; }

/* ── Hero ─────────────────────────────────── */
.hero {
    text-align: center;
    padding: 40px 0 30px;
}
.hero h1 { font-size: 2.2rem; margin-bottom: 8px; }
.subtitle { color: var(--text-light); font-size: 1.1rem; }

/* ── 卡片 ─────────────────────────────────── */
.card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 30px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}
.card h2 { margin-bottom: 20px; font-size: 1.4rem; }

/* ── 表单 ─────────────────────────────────── */
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-weight: 600; margin-bottom: 6px; color: var(--text); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

select, input[type="text"], input[type="password"], input[type="email"], input[type="number"] {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    background: var(--card);
    transition: border-color 0.2s;
    -webkit-appearance: none;
    appearance: none;
}
select:focus, input:focus { outline: none; border-color: var(--primary); }

.hint { font-size: 0.85rem; color: var(--text-light); margin-top: 4px; }

/* ── 录音区 ─────────────────────────────────── */
.record-section { text-align: center; margin-bottom: 24px; }
.mic-area { padding: 20px 0; }

.mic-btn {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    border: 4px solid var(--primary);
    background: var(--card);
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    box-shadow: 0 4px 15px rgba(79, 70, 229, 0.15);
}
.mic-btn:hover { transform: scale(1.05); box-shadow: 0 6px 20px rgba(79, 70, 229, 0.25); }
.mic-btn.recording {
    border-color: var(--danger);
    background: #fee2e2;
    animation: pulse 1.5s infinite;
}
@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4); }
    50% { box-shadow: 0 0 0 15px rgba(239, 68, 68, 0); }
}
.mic-icon { font-size: 2.5rem; }
.mic-status { font-size: 0.95rem; color: var(--text-light); margin-bottom: 8px; }
.mic-timer { font-size: 1.8rem; font-weight: 700; font-variant-numeric: tabular-nums; color: var(--danger); }

/* 波形动画 */
.waveform {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    height: 40px;
    margin-top: 12px;
}
.wave-bar {
    width: 6px;
    height: 4px;
    background: var(--primary);
    border-radius: 3px;
    transition: height 0.1s;
}

/* 音频预览 */
.audio-preview {
    margin: 16px 0;
    padding: 16px;
    background: var(--bg);
    border-radius: 8px;
}
.audio-preview audio { width: 100%; margin-bottom: 12px; }
.preview-actions { text-align: center; }

.divider {
    text-align: center;
    margin: 24px 0;
    position: relative;
}
.divider::before {
    content: '';
    position: absolute;
    left: 0; right: 0; top: 50%;
    border-top: 1px solid var(--border);
}
.divider span {
    background: var(--card);
    padding: 0 16px;
    color: var(--text-light);
    font-size: 0.9rem;
    position: relative;
}

/* ── 文件拖拽区 ─────────────────────────────── */
.file-drop {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 30px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
}
.file-drop:hover, .file-drop.dragover {
    border-color: var(--primary);
    background: #f0f0ff;
}
.file-drop input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}
.file-drop-content .icon { font-size: 2rem; display: block; margin-bottom: 8px; }
.file-selected {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}
.file-selected .icon { font-size: 2rem; }

.checkbox-label {
    display: flex !important;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    cursor: pointer;
}
.checkbox-label input { width: 18px; height: 18px; }

/* ── 按钮 ─────────────────────────────────── */
.btn {
    display: inline-block;
    padding: 10px 24px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: #4338ca; }
.btn-primary:disabled { background: #a5a5f5; cursor: not-allowed; }
.btn-secondary { background: var(--bg); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: #eef2ff; }
.btn-danger { background: #fee2e2; color: var(--danger); }
.btn-danger:hover { background: #fecaca; }
.btn-block { display: block; width: 100%; padding: 14px; font-size: 1.1rem; }

/* ── 特性卡片 ──────────────────────────────── */
.features {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-top: 30px;
}
.feature-card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
    box-shadow: var(--shadow);
}
.feature-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.feature-card p { color: var(--text-light); font-size: 0.9rem; }

/* ── 结果页 ─────────────────────────────────── */
.breadcrumb {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
}
.breadcrumb a { color: var(--primary); text-decoration: none; font-weight: 500; }
.breadcrumb a:hover { text-decoration: underline; }

.status-card h2 { margin-bottom: 16px; }
.result-header { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 24px; }

.tag {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    background: #eef2ff;
    color: var(--primary);
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    vertical-align: middle;
}

/* ── 对比区 ─────────────────────────────────── */
.compare-box {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 16px;
    align-items: start;
    margin-bottom: 24px;
}
.compare-arrow {
    font-size: 2rem;
    color: var(--primary);
    align-self: center;
    padding-top: 20px;
}
.text-box {
    padding: 16px;
    border-radius: 8px;
    font-size: 1.05rem;
    line-height: 1.7;
    min-height: 80px;
    overflow-wrap: break-word;
    word-break: break-word;
}
.text-box.original { background: #fef3c7; border: 1px solid #fde68a; }
.text-box.corrected { background: #d1fae5; border: 1px solid #6ee7b7; }
.compare-item .meta { font-size: 0.8rem; color: var(--text-light); margin-top: 6px; overflow-wrap: break-word; }

/* ── TTS 播放按钮 ─────────────────────────────── */
.tts-buttons { display: flex; gap: 8px; margin-top: 12px; }
.btn-tts {
    background: #eef2ff;
    color: var(--primary);
    border: 1px solid var(--primary-light);
    padding: 6px 14px;
    font-size: 0.85rem;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.2s;
}
.btn-tts:hover { background: var(--primary); color: #fff; }
.btn-tts.playing {
    background: var(--primary);
    color: #fff;
    animation: pulse 1.5s infinite;
}

/* ── 数据区 ─────────────────────────────────── */
.section { margin-bottom: 24px; }
.section h3 { margin-bottom: 12px; }
.intent-text {
    padding: 12px 16px;
    background: #f0f0ff;
    border-radius: 8px;
    font-size: 1.05rem;
    overflow-wrap: break-word;
    word-break: break-word;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}
.data-table th, .data-table td {
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
.data-table th { background: var(--bg); font-weight: 600; font-size: 0.85rem; color: var(--text-light); }
.data-table tr:hover { background: #f8fafc; }

.text-red { color: var(--danger); }
.text-green { color: var(--success); }
.text-truncate {
    max-width: 200px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.action-list { padding-left: 20px; }
.action-list li { padding: 6px 0; }

.actions-bar { display: flex; gap: 12px; margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--border); }

/* ── 历史表 ─────────────────────────────────── */
.history-table { font-size: 0.9rem; }
.clickable { cursor: pointer; }
.clickable:hover { background: #f0f0ff !important; }

.status { font-size: 1.2rem; }

.empty-state { text-align: center; padding: 40px; color: var(--text-light); }
.empty-state p { font-size: 1.2rem; margin-bottom: 16px; }

/* ── Footer ─────────────────────────────────── */
.footer {
    text-align: center;
    padding: 20px;
    color: var(--text-light);
    font-size: 0.85rem;
    border-top: 1px solid var(--border);
    margin-top: 40px;
}

/* ── 认证页 ─────────────────────────────────── */
.auth-page { display: flex; justify-content: center; padding: 40px 0; }
.auth-card { max-width: 420px; width: 100%; }
.auth-card h2 { text-align: center; margin-bottom: 24px; }
.auth-link { text-align: center; margin-top: 16px; color: var(--text-light); }
.auth-link a { color: var(--primary); font-weight: 600; }

/* 导航用户 */
.nav-user { color: var(--text-light); font-size: 0.9rem; margin-left: 24px; }
.lang-switch {
    display: inline-block;
    padding: 2px 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--primary);
    margin-left: 16px;
    text-decoration: none;
    transition: all 0.2s;
}
.lang-switch:hover { background: var(--primary); color: #fff; }

/* 提示框 */
.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; font-size: 0.95rem; }
.alert-error { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }
.alert-success { background: #d1fae5; color: #065f46; border: 1px solid #6ee7b7; }

/* ── 加载动画 ─────────────────────────────────── */
.loading-bar {
    width: 100%;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    margin: 16px 0;
    overflow: hidden;
}
.loading-bar-inner {
    width: 30%;
    height: 100%;
    background: var(--primary);
    border-radius: 2px;
    animation: loading-slide 1.5s ease-in-out infinite;
}
@keyframes loading-slide {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(400%); }
}

/* ── 响应式 ─────────────────────────────────── */
@media (max-width: 768px) {
    .container { padding: 0 16px; max-width: 100%; overflow-x: hidden; }
    main { padding: 16px; }

    /* 导航：改为纵向排列 */
    .navbar { padding: 12px 0; }
    .navbar .container { flex-wrap: wrap; gap: 8px; }
    .nav-links {
        display: flex;
        flex-wrap: wrap;
        gap: 4px 12px;
        width: 100%;
        justify-content: center;
    }
    .nav-links a { margin-left: 0; font-size: 0.85rem; }
    .nav-user { margin-left: 0; font-size: 0.85rem; }
    .lang-switch { margin-left: 0; }

    /* Hero */
    .hero { padding: 24px 0 16px; }
    .hero h1 { font-size: 1.6rem; }
    .subtitle { font-size: 0.95rem; }

    /* 卡片 */
    .card { padding: 20px 16px; max-width: 100%; box-sizing: border-box; }
    .card h2 { font-size: 1.2rem; }

    /* 表单 */
    .form-row { grid-template-columns: 1fr; gap: 12px; }
    .form-group { margin-bottom: 16px; }

    /* 录音 */
    .mic-btn { width: 80px; height: 80px; }
    .mic-icon { font-size: 2rem; }
    .mic-timer { font-size: 1.4rem; }

    /* 文件拖拽 */
    .file-drop { padding: 20px 16px; }

    /* 特性卡片 */
    .features { grid-template-columns: 1fr 1fr; gap: 12px; }
    .feature-card { padding: 16px; }
    .feature-card h3 { font-size: 0.95rem; }
    .feature-card p { font-size: 0.8rem; }

    /* 结果页 */
    .result-header { gap: 6px; margin-bottom: 16px; }
    .result-header .tag { font-size: 0.7rem; max-width: 120px; }

    /* 对比区 */
    .compare-box { grid-template-columns: 1fr; gap: 12px; }
    .compare-arrow { transform: rotate(90deg); padding: 0; font-size: 1.5rem; }
    .compare-item { width: 100%; overflow: hidden; }
    .text-box { font-size: 0.95rem; padding: 12px; }
    .compare-item h3 { font-size: 0.95rem; }
    .compare-item .meta { font-size: 0.75rem; word-break: break-all; }

    /* 数据区 */
    .section h3 { font-size: 1rem; }
    .intent-text { font-size: 0.95rem; padding: 10px 12px; }

    /* 数据表格：横向滚动 */
    .data-table-wrap {
        width: 100%;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        margin: 0 -16px;
        padding: 0 16px;
        scrollbar-width: thin;
    }
    .data-table { width: 100%; min-width: 0; border-collapse: collapse; }
    .data-table th, .data-table td { padding: 6px 8px; font-size: 0.8rem; word-break: break-word; }

    /* 历史表格：隐藏次要列，压缩宽度 */
    .history-table { font-size: 0.75rem; }
    .history-table th:nth-child(1),
    .history-table td:nth-child(1) { display: none; }
    .history-table th:nth-child(5),
    .history-table td:nth-child(5),
    .history-table th:nth-child(6),
    .history-table td:nth-child(6) { display: none; }
    .history-table td { max-width: 80px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

    /* 认证页 */
    .auth-page { padding: 20px 0; }
    .auth-card { padding: 20px 16px; }

    /* 按钮 */
    .btn-block { padding: 12px; font-size: 1rem; }

    /* 面包屑 */
    .breadcrumb { gap: 12px; font-size: 0.9rem; }

    /* 操作栏 */
    .actions-bar { flex-wrap: wrap; gap: 8px; }
    .actions-bar .btn { flex: 1; min-width: 100px; text-align: center; font-size: 0.9rem; padding: 10px 12px; }
}

/* 小屏手机 */
@media (max-width: 400px) {
    .features { grid-template-columns: 1fr; }
    .hero h1 { font-size: 1.4rem; }
    .mic-btn { width: 70px; height: 70px; }
    .mic-icon { font-size: 1.8rem; }
}