/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --success-color: #00c853;
    --danger-color: #ff5252;
    --warning-color: #ffc107;
    --dark-color: #2c3e50;
    --light-color: #f8f9fa;
    --text-color: #333;
    --border-radius: 12px;
    --box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: bold;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo i {
    font-size: 28px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav {
    display: flex;
    gap: 30px;
}

.nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    transition: var(--transition);
}

.nav a:hover::after {
    width: 100%;
}

/* 主内容区 */
.main-content {
    padding: 40px 0;
    min-height: calc(100vh - 200px);
}

/* 标题区 */
.hero-section {
    text-align: center;
    color: white;
    margin-bottom: 40px;
}

.hero-section h1 {
    font-size: 48px;
    margin-bottom: 15px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    animation: fadeInDown 0.8s ease;
}

.subtitle {
    font-size: 20px;
    margin-bottom: 20px;
    opacity: 0.95;
    animation: fadeInUp 0.8s ease;
}

.tips {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    padding: 12px 24px;
    border-radius: 50px;
    font-size: 14px;
    animation: fadeIn 1s ease;
}

/* 解析功能区 */
.parse-section {
    margin-bottom: 60px;
}

.parse-card {
    background: white;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 30px;
    animation: fadeInUp 0.8s ease;
}

.form-group {
    margin-bottom: 25px;
    position: relative;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--dark-color);
    font-size: 16px;
}

.form-group label i {
    color: var(--primary-color);
    margin-right: 5px;
}

.form-control {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid #e0e0e0;
    border-radius: var(--border-radius);
    font-size: 16px;
    transition: var(--transition);
    background: #f8f9fa;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    background: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.quick-clear {
    position: absolute;
    right: 15px;
    top: 45px;
    cursor: pointer;
    color: #999;
    font-size: 20px;
    transition: var(--transition);
}

.quick-clear:hover {
    color: var(--danger-color);
}

/* 按钮组 */
.button-group {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.btn {
    padding: 15px 30px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    flex: 1;
    justify-content: center;
    min-width: 150px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: linear-gradient(135deg, #ff6b6b, #ee5a6f);
    color: white;
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
}

.btn-outline {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* 视频播放区 */
.video-container {
    background: #000;
    border-radius: var(--border-radius);
    overflow: hidden;
    position: relative;
    min-height: 500px;
    box-shadow: var(--box-shadow);
    animation: fadeInUp 1s ease;
}

.placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.6);
    z-index: 1;
}

.placeholder i {
    font-size: 80px;
    margin-bottom: 20px;
    opacity: 0.5;
}

.placeholder p {
    font-size: 18px;
    margin: 5px 0;
}

.placeholder-tip {
    font-size: 14px;
    opacity: 0.7;
}

#video-player {
    width: 100%;
    height: 500px;
    display: none;
    position: relative;
    z-index: 2;
}

#video-player.active {
    display: block;
}

/* 快捷入口 */
.quick-links {
    background: white;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 60px;
    animation: fadeInUp 1.2s ease;
}

.quick-links h3 {
    margin-bottom: 30px;
    color: var(--dark-color);
    font-size: 24px;
}

.quick-links h3 i {
    color: var(--primary-color);
    margin-right: 10px;
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 20px;
}

.platform-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    background: #f8f9fa;
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--text-color);
    transition: var(--transition);
}

.platform-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.platform-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
    font-size: 24px;
    color: white;
}

.platform-card span {
    font-weight: 600;
    font-size: 14px;
}

/* 使用教程 */
.tutorial-section {
    background: white;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 60px;
    animation: fadeInUp 1.4s ease;
}

.tutorial-section h2 {
    margin-bottom: 30px;
    color: var(--dark-color);
    font-size: 28px;
}

.tutorial-section h2 i {
    color: var(--primary-color);
    margin-right: 10px;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.step-card {
    display: flex;
    gap: 20px;
    padding: 25px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.step-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.step-number {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: bold;
    flex-shrink: 0;
}

.step-content h3 {
    margin-bottom: 10px;
    color: var(--dark-color);
}

.step-content p {
    color: #666;
    font-size: 14px;
    line-height: 1.6;
}

/* 常见问题 */
.faq-section {
    background: white;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    animation: fadeInUp 1.6s ease;
}

.faq-section h2 {
    margin-bottom: 30px;
    color: var(--dark-color);
    font-size: 28px;
}

.faq-section h2 i {
    color: var(--primary-color);
    margin-right: 10px;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.faq-card {
    padding: 25px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.faq-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.faq-card h3 {
    margin-bottom: 15px;
    color: var(--dark-color);
    font-size: 16px;
}

.faq-card h3 i {
    color: var(--primary-color);
    margin-right: 8px;
}

.faq-card p {
    color: #666;
    font-size: 14px;
    line-height: 1.6;
}

/* 页脚 */
.footer {
    background: rgba(0, 0, 0, 0.9);
    color: rgba(255, 255, 255, 0.8);
    padding: 40px 0 20px;
    margin-top: 60px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 30px;
}

.footer-section h4 {
    color: white;
    margin-bottom: 15px;
    font-size: 18px;
}

.footer-section p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 10px;
}

.footer-section i {
    margin-right: 8px;
    color: var(--primary-color);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-color);
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    font-size: 14px;
    opacity: 0.7;
}

/* 动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-section h1 {
        font-size: 32px;
    }

    .subtitle {
        font-size: 16px;
    }

    .parse-card {
        padding: 25px;
    }

    .button-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .nav {
        gap: 15px;
    }

    .nav a {
        font-size: 14px;
    }

    .platform-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
        gap: 15px;
    }

    .steps {
        grid-template-columns: 1fr;
    }

    .faq-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    #video-player {
        height: 300px;
    }

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

@media (max-width: 480px) {
    .header .container {
        flex-direction: column;
        gap: 15px;
    }

    .hero-section h1 {
        font-size: 24px;
    }

    .parse-card {
        padding: 20px;
    }
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

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