:root {
    --primary: #2D5F8A;
    --primary-dark: #1C3A5E;
    --primary-light: #4E79A7;
    --accent: #F28E2B;
    --success: #59A14F;
    --danger: #E15759;
    --warning: #EDC948;
    --info: #76B7B2;
    --text: #2E3440;
    --text-light: #6B7280;
    --bg: #F5F7FA;
    --card: #FFFFFF;
    --border: #E5E7EB;
    --shadow: 0 2px 12px rgba(0,0,0,0.08);
    --radius: 10px;
    --sidebar-width: 260px;
    --header-height: 60px;
}

* { 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: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ===== 侧边栏 ===== */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: linear-gradient(180deg, var(--primary-dark) 0%, var(--primary) 100%);
    color: #fff;
    z-index: 1000;
    transition: transform 0.3s ease;
    overflow-y: auto;
}

.sidebar-brand {
    padding: 20px 24px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-brand .logo {
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.2);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.sidebar-brand h2 {
    font-size: 18px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.sidebar-brand small {
    display: block;
    font-size: 11px;
    opacity: 0.7;
    margin-top: 2px;
}

.sidebar-nav {
    padding: 16px 12px;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    margin: 4px 0;
    border-radius: 8px;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 14px;
}

.nav-item:hover {
    background: rgba(255,255,255,0.1);
    color: #fff;
}

.nav-item.active {
    background: rgba(255,255,255,0.2);
    color: #fff;
    font-weight: 500;
}

.nav-item .icon {
    width: 24px;
    margin-right: 12px;
    text-align: center;
    font-size: 16px;
}

.nav-divider {
    height: 1px;
    background: rgba(255,255,255,0.1);
    margin: 12px 0;
}

.nav-label {
    padding: 8px 16px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.5;
}

/* ===== 主内容区 ===== */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    transition: margin-left 0.3s;
}

.header {
    height: var(--header-height);
    background: var(--card);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 20px;
    color: var(--text);
    cursor: pointer;
}

.header-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-badge {
    background: var(--accent);
    color: #fff;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.content {
    padding: 24px;
    max-width: 1400px;
    margin: 0 auto;
}

/* ===== 页面区块 ===== */
.page {
    display: none;
    animation: fadeIn 0.3s ease;
}

.page.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== 卡片 ===== */
.card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
    margin-bottom: 20px;
    border: 1px solid var(--border);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-title .icon {
    color: var(--primary);
}

/* ===== 表单元素 ===== */
.form-group {
    margin-bottom: 18px;
}

.form-label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-light);
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    color: var(--text);
    background: #fff;
    transition: border-color 0.2s, box-shadow 0.2s;
    font-family: inherit;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(45,95,138,0.1);
}

textarea.form-control {
    min-height: 120px;
    resize: vertical;
}

select.form-control {
    cursor: pointer;
}

.form-hint {
    font-size: 12px;
    color: var(--text-light);
    margin-top: 4px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    font-family: inherit;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(45,95,138,0.3);
}

.btn-success {
    background: var(--success);
    color: #fff;
}

.btn-success:hover:not(:disabled) {
    background: #4a8a3f;
}

.btn-danger {
    background: var(--danger);
    color: #fff;
}

.btn-danger:hover:not(:disabled) {
    background: #c94446;
}

.btn-warning {
    background: var(--warning);
    color: var(--text);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
}

.btn-outline:hover:not(:disabled) {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(45,95,138,0.05);
}

.btn-sm {
    padding: 6px 14px;
    font-size: 12px;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}

.btn-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

/* ===== 统计卡片 ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 16px;
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
}

.stat-icon.blue { background: rgba(45,95,138,0.1); color: var(--primary); }
.stat-icon.green { background: rgba(89,161,79,0.1); color: var(--success); }
.stat-icon.orange { background: rgba(242,142,43,0.1); color: var(--accent); }
.stat-icon.red { background: rgba(225,87,89,0.1); color: var(--danger); }

.stat-info h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text);
}

.stat-info p {
    font-size: 13px;
    color: var(--text-light);
}

/* ===== 录音区域 ===== */
.recording-area {
    text-align: center;
    padding: 40px 20px;
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    background: #fafbfc;
}

.recording-area.recording {
    border-color: var(--danger);
    background: rgba(225,87,89,0.05);
}

.recording-area .timer {
    font-size: 48px;
    font-weight: 700;
    color: var(--primary);
    margin: 20px 0;
    font-variant-numeric: tabular-nums;
}

.recording-area .timer.warning {
    color: var(--danger);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.recording-area .waveform {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 3px;
    height: 40px;
    margin: 16px 0;
}

.waveform .bar {
    width: 4px;
    height: 10px;
    background: var(--primary);
    border-radius: 2px;
    transition: height 0.1s;
}

.recording-area.recording .waveform .bar {
    animation: wave 0.5s ease-in-out infinite;
}

@keyframes wave {
    0%, 100% { height: 10px; }
    50% { height: 30px; }
}

.recording-area .waveform .bar:nth-child(1) { animation-delay: 0s; }
.recording-area .waveform .bar:nth-child(2) { animation-delay: 0.1s; }
.recording-area .waveform .bar:nth-child(3) { animation-delay: 0.2s; }
.recording-area .waveform .bar:nth-child(4) { animation-delay: 0.3s; }
.recording-area .waveform .bar:nth-child(5) { animation-delay: 0.4s; }
.recording-area .waveform .bar:nth-child(6) { animation-delay: 0.5s; }
.recording-area .waveform .bar:nth-child(7) { animation-delay: 0.6s; }
.recording-area .waveform .bar:nth-child(8) { animation-delay: 0.7s; }
.recording-area .waveform .bar:nth-child(9) { animation-delay: 0.8s; }
.recording-area .waveform .bar:nth-child(10) { animation-delay: 0.9s; }

/* ===== 文件上传区域 ===== */
.upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    background: #fafbfc;
}

.upload-area:hover, .upload-area.dragover {
    border-color: var(--primary);
    background: rgba(45,95,138,0.05);
}

.upload-area .icon {
    font-size: 48px;
    color: var(--primary);
    margin-bottom: 12px;
}

.upload-area p {
    color: var(--text-light);
    font-size: 14px;
}

/* ===== 音频播放器 ===== */
.audio-player {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: var(--radius);
    padding: 20px;
    color: #fff;
    margin-top: 16px;
}

.audio-player .controls {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-top: 12px;
}

.audio-player .play-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(255,255,255,0.2);
    border: none;
    color: #fff;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.audio-player .play-btn:hover {
    background: rgba(255,255,255,0.3);
    transform: scale(1.05);
}

.audio-player .progress-bar {
    flex: 1;
    height: 6px;
    background: rgba(255,255,255,0.3);
    border-radius: 3px;
    overflow: hidden;
    cursor: pointer;
}

.audio-player .progress-fill {
    height: 100%;
    background: #fff;
    border-radius: 3px;
    width: 0%;
    transition: width 0.1s;
}

.audio-player .time {
    font-size: 12px;
    opacity: 0.8;
    font-variant-numeric: tabular-nums;
}

/* ===== 音色列表 ===== */
.voice-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
}

.voice-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    text-align: center;
    transition: all 0.2s;
    cursor: pointer;
}

.voice-card:hover {
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(45,95,138,0.15);
    transform: translateY(-2px);
}

.voice-card.selected {
    border-color: var(--primary);
    background: rgba(45,95,138,0.05);
}

.voice-avatar {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    margin: 0 auto 12px;
}

.voice-card h4 {
    font-size: 14px;
    margin-bottom: 4px;
}

.voice-card .meta {
    font-size: 12px;
    color: var(--text-light);
}

.voice-card .badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
    margin-top: 6px;
}

.voice-card .badge.custom {
    background: rgba(242,142,43,0.1);
    color: var(--accent);
}

.voice-card .badge.predefined {
    background: rgba(89,161,79,0.1);
    color: var(--success);
}

/* ===== 表格 ===== */
.table-wrapper {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

table th, table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
}

table th {
    background: var(--bg);
    font-weight: 600;
    color: var(--text-light);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

table tr:hover {
    background: rgba(45,95,138,0.02);
}

/* ===== 标签/徽章 ===== */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success { background: rgba(89,161,79,0.1); color: var(--success); }
.badge-warning { background: rgba(242,142,43,0.1); color: var(--accent); }
.badge-danger { background: rgba(225,87,89,0.1); color: var(--danger); }
.badge-info { background: rgba(118,183,178,0.1); color: var(--info); }

/* ===== 提示框 ===== */
.toast {
    position: fixed;
    top: 80px;
    right: 24px;
    padding: 14px 24px;
    border-radius: 8px;
    color: #fff;
    font-size: 14px;
    z-index: 9999;
    transform: translateX(120%);
    transition: transform 0.3s ease;
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
    max-width: 400px;
}

.toast.show {
    transform: translateX(0);
}

.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
.toast.warning { background: var(--accent); }
.toast.info { background: var(--info); }

/* ===== 加载动画 ===== */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.spinner.dark {
    border-color: rgba(45,95,138,0.3);
    border-top-color: var(--primary);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===== 费用提示 ===== */
.cost-estimate {
    background: linear-gradient(135deg, #fff8e1 0%, #fff3e0 100%);
    border: 1px solid var(--warning);
    border-radius: var(--radius);
    padding: 14px 20px;
    margin-top: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.cost-estimate .amount {
    font-size: 20px;
    font-weight: 700;
    color: var(--accent);
}

.cost-estimate .detail {
    font-size: 13px;
    color: var(--text-light);
}

/* ===== 文案生成区 ===== */
.copywriting-result {
    background: #fafbfc;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    margin-top: 16px;
    white-space: pre-wrap;
    line-height: 1.8;
    max-height: 500px;
    overflow-y: auto;
}

/* ===== 空状态 ===== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
}

.empty-state .icon {
    font-size: 64px;
    margin-bottom: 16px;
    opacity: 0.3;
}

.empty-state h3 {
    font-size: 18px;
    margin-bottom: 8px;
    color: var(--text);
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .main-content {
        margin-left: 0;
    }
    .menu-toggle {
        display: block;
    }
    .form-row {
        grid-template-columns: 1fr;
    }
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
    .voice-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    .voice-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== 滚动条美化 ===== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: #a1a1a1;
}

/* ===== 模态框 ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-overlay.show {
    display: flex;
}

.modal {
    background: var(--card);
    border-radius: var(--radius);
    max-width: 600px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* ===== 字符计数器 ===== */
.char-counter {
    text-align: right;
    font-size: 12px;
    color: var(--text-light);
    margin-top: 4px;
}

.char-counter.warning {
    color: var(--accent);
}

.char-counter.danger {
    color: var(--danger);
}