:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    --secondary-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --danger-gradient: linear-gradient(135deg, #ff416c 0%, #ff4b2b 100%);
    --success-gradient: linear-gradient(135deg, #4ecdc4 0%, #44a08d 100%);
    --dark-bg: #0a0a0a;
    --card-bg: rgba(255, 255, 255, 0.05);
    --glass-bg: rgba(255, 255, 255, 0.1);
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-light: 0 8px 32px rgba(102, 126, 234, 0.3);
    --shadow-heavy: 0 20px 60px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--dark-bg);
    min-height: 100vh;
    overflow-x: hidden;
    color: var(--text-primary);
    position: relative;
}

/* 动态背景 */
.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: radial-gradient(ellipse at top, #1a1a2e 0%, #16213e 50%, #0f0f23 100%);
}

.background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><defs><radialGradient id="a" cx="50%" cy="50%"><stop offset="0%" stop-color="%23667eea" stop-opacity="0.1"/><stop offset="100%" stop-color="%23667eea" stop-opacity="0"/></radialGradient></defs><circle cx="200" cy="200" r="100" fill="url(%23a)"><animate attributeName="cx" values="200;800;200" dur="20s" repeatCount="indefinite"/><animate attributeName="cy" values="200;600;200" dur="15s" repeatCount="indefinite"/></circle><circle cx="800" cy="400" r="150" fill="url(%23a)"><animate attributeName="cx" values="800;200;800" dur="25s" repeatCount="indefinite"/><animate attributeName="cy" values="400;800;400" dur="18s" repeatCount="indefinite"/></circle></svg>') center/cover;
    animation: float 30s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-20px) scale(1.1); }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
    position: relative;
    z-index: 1;
}

.header {
    text-align: center;
    margin-bottom: 60px;
    animation: slideDown 1s ease-out;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-50px); }
    to { opacity: 1; transform: translateY(0); }
}

.logo {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: var(--primary-gradient);
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    box-shadow: var(--shadow-light);
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); box-shadow: var(--shadow-light); }
    50% { transform: scale(1.05); box-shadow: 0 12px 40px rgba(102, 126, 234, 0.5); }
}

.title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
    letter-spacing: -2px;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    font-weight: 400;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.main-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    animation: slideUp 1s ease-out 0.3s both;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(50px); }
    to { opacity: 1; transform: translateY(0); }
}

.video-section {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-radius: 32px;
    border: 1px solid var(--border-color);
    padding: 40px;
    box-shadow: var(--shadow-heavy);
    position: relative;
    overflow: hidden;
}

.video-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--primary-gradient);
}

.video-container {
    position: relative;
    width: 100%;
    min-height: 400px;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 24px;
    overflow: hidden;
    margin-bottom: 30px;
    border: 2px solid rgba(255, 255, 255, 0.05);
    transition: all 0.3s ease;
}

.video-container:hover {
    border-color: rgba(102, 126, 234, 0.3);
    box-shadow: 0 0 30px rgba(102, 126, 234, 0.2);
}

video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 22px;
}

.placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-secondary);
    text-align: center;
    gap: 24px;
}

.placeholder-icon {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: var(--secondary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: white;
    animation: bounce 2s ease-in-out infinite;
    box-shadow: 0 10px 30px rgba(79, 172, 254, 0.3);
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.placeholder-text {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 8px;
}

.placeholder-hint {
    font-size: 1rem;
    opacity: 0.7;
}

.controls {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 30px;
}

.btn {
    position: relative;
    padding: 16px 32px;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 12px;
    min-width: 160px;
    justify-content: center;
    text-transform: uppercase;
    letter-spacing: 1px;
    overflow: hidden;
    font-family: inherit;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
    border: 2px solid transparent;
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 15px 35px rgba(102, 126, 234, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 2px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(102, 126, 234, 0.5);
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.btn:active {
    transform: translateY(-1px) scale(0.98);
}

.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s linear infinite;
}

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

.message {
    padding: 20px 24px;
    border-radius: 16px;
    margin: 20px 0;
    font-weight: 500;
    display: none;
    align-items: center;
    gap: 12px;
    animation: messageSlide 0.3s ease-out;
}

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

.error-message {
    background: rgba(255, 65, 108, 0.1);
    color: #ff6b8a;
    border: 1px solid rgba(255, 65, 108, 0.2);
}

.success-message {
    background: rgba(78, 205, 196, 0.1);
    color: #4ecdc4;
    border: 1px solid rgba(78, 205, 196, 0.2);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    margin-top: 30px;
}

.info-card {
    background: rgba(255, 255, 255, 0.03);
    border-radius: 20px;
    padding: 24px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.info-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(102, 126, 234, 0.3);
    transform: translateY(-2px);
}

.info-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.info-card-icon {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: var(--secondary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.info-card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.info-card-value {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.status-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-top: 30px;
    padding: 16px 24px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 50px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
}

.status-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    animation: statusPulse 2s ease-in-out infinite;
}

@keyframes statusPulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.status-online .status-indicator {
    background: #4ecdc4;
    box-shadow: 0 0 10px #4ecdc4;
}

.status-offline .status-indicator {
    background: #ff6b8a;
    box-shadow: 0 0 10px #ff6b8a;
}

.status-text {
    font-weight: 500;
    font-size: 0.95rem;
}

.hidden {
    display: none !important;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 20px 16px;
    }

    .video-section {
        padding: 24px;
        border-radius: 24px;
    }

    .video-container {
        min-height: 300px;
    }

    .controls {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
    }

    .info-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .title {
        font-size: 2.5rem;
    }

    .subtitle {
        font-size: 1.1rem;
    }
}

@media (max-width: 480px) {
    .header {
        margin-bottom: 40px;
    }

    .logo {
        width: 60px;
        height: 60px;
        font-size: 2rem;
    }

    .video-section {
        padding: 20px;
    }

    .placeholder-icon {
        width: 100px;
        height: 100px;
        font-size: 2.5rem;
    }

    .placeholder-text {
        font-size: 1.3rem;
    }
}

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

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
}

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

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-gradient);
}

/* 键盘导航提示 */
.keyboard-hint {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 0.8rem;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 1000;
}

.keyboard-hint.show {
    opacity: 1;
}