:root {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-main: #e0e0e0;
    --text-muted: #a0a0a0;
    --accent: #4a6bff;
    --accent-hover: #3a5bef;
    --border: #333;
    --success: #00d4aa;
    --danger: #ef4444;
}

/* 优化图片和视频显示 */
img, video {
    max-width: 100%;
    height: auto;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

h1 { 
    margin-bottom: 20px; 
    font-weight: 300; 
    margin-top: 20px;
    text-align: center;
    font-size: clamp(1.5rem, 4vw, 2.2rem);
}

.badge { 
    background: var(--success); 
    color: white; 
    padding: 3px 10px; 
    border-radius: 20px; 
    font-size: 0.6rem; 
    vertical-align: middle; 
    margin-left: 8px;
    font-weight: 600;
}

/* Layout */
.container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 20px;
    width: 100%;
    max-width: 1200px;
    margin-top: 30px;
}

@media (max-width: 768px) {
    .container { 
        grid-template-columns: 1fr; 
        gap: 15px;
    }
}

/* Cards */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
}

/* Video Area */
.video-wrapper {
    position: relative;
    width: 100%;
    background: #000;
    border-radius: 8px;
    overflow: hidden;
    aspect-ratio: 16/9;
    display: flex;
    justify-content: center;
    align-items: center;
}

video {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transform: scaleX(-1); /* Default Mirror */
}

video.no-mirror { 
    transform: scaleX(1); 
    transition: transform 0.3s ease;
}

.overlay-stats {
    position: absolute;
    top: 10px;
    left: 10px;
    background: rgba(0,0,0,0.6);
    padding: 5px 10px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 14px;
    pointer-events: none;
    z-index: 10;
}

/* Controls */
.controls-row {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.select-group {
    flex: 2;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.btn-group {
    flex: 1;
    display: flex;
    gap: 10px;
    align-items: flex-end;
}

label { 
    font-size: 12px; 
    color: var(--text-muted); 
    margin-bottom: 4px;
    display: block;
}

select, button {
    padding: 12px 15px;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: #2d2d2d;
    color: white;
    font-size: 14px;
    font-family: inherit;
}

button {
    cursor: pointer;
    background: var(--accent);
    border: none;
    font-weight: 600;
    transition: background 0.2s, transform 0.1s;
    white-space: nowrap;
}

button:hover { 
    background: var(--accent-hover); 
    transform: translateY(-1px);
}

button:active { 
    transform: translateY(0); 
}

button.secondary { 
    background: #4b5563; 
}

button.secondary:hover { 
    background: #5a6575; 
}

/* Info Panel */
.info-table { 
    width: 100%; 
    border-collapse: collapse; 
    font-size: 14px; 
}

.info-table td { 
    padding: 10px 0; 
    border-bottom: 1px solid var(--border); 
}

.info-table td:first-child { 
    color: var(--text-muted); 
    width: 40%; 
    font-weight: 500;
}

.info-table td:last-child { 
    font-family: 'Consolas', 'Monaco', monospace; 
    text-align: right; 
    font-weight: 600;
    color: var(--text-main);
}

.status-dot {
    height: 10px;
    width: 10px;
    background-color: #555;
    border-radius: 50%;
    display: inline-block;
    margin-right: 8px;
}

/* 调整按钮布局，当只有一个按钮时 */
.btn-group button:only-child {
    width: 100%;
}

.active .status-dot { 
    background-color: var(--success); 
    box-shadow: 0 0 8px var(--success); 
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(0, 212, 170, 0.7); }
    70% { box-shadow: 0 0 0 6px rgba(0, 212, 170, 0); }
    100% { box-shadow: 0 0 0 0 rgba(0, 212, 170, 0); }
}

.error .status-dot { 
    background-color: var(--danger); 
}

/* 引导性内容样式 */
.intro-section {
    background: linear-gradient(135deg, #1a1a1a 0%, #2a2a2a 100%);
    padding: 25px;
    border-radius: 12px;
    margin-bottom: 30px;
    border-left: 5px solid #4CAF50;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    width: 100%;
    max-width: 1200px;
}

.intro-section p {
    font-size: 1.1em;
    line-height: 1.6;
    color: #e0e0e0;
    margin-bottom: 20px;
}

.intro-section strong {
    color: #4CAF50;
    font-weight: 600;
}

.compatibility-note {
    margin-top: 15px;
    background: rgba(76, 175, 80, 0.1);
    padding: 12px 15px;
    border-radius: 6px;
    font-size: 0.95em;
    border-left: 3px solid #4CAF50;
}

.compatibility-note i {
    color: #4CAF50;
    margin-right: 8px;
}

.keyboard-types {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 15px;
}

.keyboard-type-tag {
    display: inline-block;
    background: rgba(76, 175, 80, 0.15);
    color: #4CAF50;
    padding: 8px 16px;
    border-radius: 25px;
    font-size: 0.9em;
    font-weight: 500;
    border: 1px solid rgba(76, 175, 80, 0.3);
    transition: all 0.3s ease;
}

.keyboard-type-tag:hover {
    background: rgba(76, 175, 80, 0.25);
    transform: translateY(-2px);
}

/* 核心优势展示 */
.stats-section {
    width: 100%;
    max-width: 1200px;
    margin: 40px 0 30px 0;
    padding: 25px;
    background: linear-gradient(135deg, #1e1e1e 0%, #2a2a2a 100%);
    border-radius: 12px;
    border: 1px solid var(--border);
}

.stats-section h2 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--text-main);
    font-weight: 300;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

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

.stat-item {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 5px;
}

.stat-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 10px;
}

.stat-item p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin: 0;
}

/* 响应式设计 */
@media (max-width: 768px) {
    body {
        padding: 15px;
    }
    
    .intro-section {
        padding: 20px;
    }
    
    .keyboard-types {
        justify-content: center;
    }
    
    .keyboard-type-tag {
        padding: 6px 12px;
        font-size: 0.85em;
    }
    
    .container {
        padding: 0 10px;
    }
    
    .card {
        padding: 15px;
    }
    
    .video-wrapper {
        aspect-ratio: 4/3; /* 移动端更适合4:3比例 */
    }
}

@media (max-width: 480px) {
    .intro-section {
        padding: 15px;
    }
    
    .keyboard-type-tag {
        padding: 5px 10px;
        font-size: 0.8em;
    }
    
    .controls-row {
        flex-direction: column;
    }
    
    .select-group, .btn-group {
        width: 100%;
    }
    
    select, button {
        width: 100%;
    }
    
    .overlay-stats {
        font-size: 12px;
        padding: 4px 8px;
    }
}

/* 打印样式 */
@media print {
    .language-switcher,
    .btn-group,
    .intro-section,
    .stats-section,
    .page-navigation-section,
    .instructions-section {
        display: none !important;
    }
    
    .card {
        break-inside: avoid;
        box-shadow: none !important;
        border: 1px solid #ccc !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
    
    .info-table td:first-child {
        color: #666 !important;
    }
}