/* ===== 基础样式 ===== */
:root {
    --primary: #2563eb;
    --primary-dark: #1e429f;
    --primary-light: #93c5fd;
    --secondary: #e1f0ff;
    --accent: #0ea5e9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-light: #94a3b8;
    --background: #ffffff;
    --background-alt: #f8fafc;
    --border: #e2e8f0;
    --border-focus: #bfdbfe;
    --success: #10b981;
    --error: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    --gradient-primary: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
    --gradient-secondary: linear-gradient(135deg, #0ea5e9 0%, #38bdf8 100%);
    --gradient-dark: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
    --shadow-glow: 0 0 15px rgba(37, 99, 235, 0.4);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-primary);
    background: var(--background);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    width: 100%;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

img {
    max-width: 100%;
    height: auto;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--primary-dark);
}

button {
    cursor: pointer;
    font-family: inherit;
    border: none;
    background: none;
}

/* ===== 标题样式 ===== */
.section-title {
    font-size: 2.25rem;
    text-align: center;
    margin-bottom: 2.5rem;
    position: relative;
    color: var(--text-primary);
    font-weight: 800;
}

.section-title i {
    margin-right: 0.5rem;
    color: var(--primary);
}

.section-title::after {
    content: "";
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--primary);
    border-radius: 2px;
}

/* ===== 头部导航 ===== */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-lg), 0 4px 20px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.7);
}

header.scrolled {
    padding: 0.75rem 5%;
    background-color: rgba(255, 255, 255, 0.98);
}

.logo-container {
    display: flex;
    align-items: center;
    transition: transform 0.3s ease;
}

.logo-container:hover {
    transform: translateY(-2px);
}

.logo-icon {
    width: 36px;
    height: 36px;
    color: var(--primary);
    margin-right: 0.75rem;
    filter: drop-shadow(0 0 8px rgba(37, 99, 235, 0.4));
    transition: transform 0.3s ease, filter 0.3s ease;
}

.logo-container:hover .logo-icon {
    transform: rotate(5deg) scale(1.05);
    filter: drop-shadow(0 0 12px rgba(37, 99, 235, 0.5));
}

.site-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    position: relative;
    transition: transform 0.3s ease;
}

.main-nav {
    transition: all 0.3s ease;
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 1.5rem;
}

.main-nav li {
    position: relative;
}

.main-nav a {
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0.75rem;
    display: flex;
    align-items: center;
    border-radius: var(--radius);
    transition: all 0.3s ease;
}

.main-nav a:hover {
    color: var(--primary);
    background-color: rgba(37, 99, 235, 0.05);
}

.main-nav a i {
    margin-right: 0.5rem;
    font-size: 1rem;
    transition: transform 0.3s ease;
}

.main-nav a:hover i {
    transform: translateY(-1px);
    color: var(--primary);
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: all 0.3s ease;
    transform: translateX(-50%);
    opacity: 0;
    border-radius: 2px;
}

.main-nav a:hover::after,
.main-nav a.active::after {
    width: 70%;
    opacity: 1;
}

.main-nav a.active {
    color: var(--primary);
    font-weight: 600;
}

.main-nav a.active i {
    color: var(--primary);
}

.mobile-toggle {
    display: none;
    font-size: 1.5rem;
    color: var(--text-primary);
    background: none;
    border: none;
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.mobile-toggle:hover {
    background-color: rgba(37, 99, 235, 0.1);
    color: var(--primary);
}

/* ===== 英雄区 ===== */
.hero {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4rem 5%;
    position: relative;
    background: linear-gradient(135deg, #f8fafc 0%, var(--secondary) 100%);
    overflow: hidden;
    min-height: 75vh;
}

.hero::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(37, 99, 235, 0.03) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(14, 165, 233, 0.03) 0%, transparent 20%),
        radial-gradient(circle at 50% 50%, rgba(37, 99, 235, 0.05) 0%, transparent 50%);
    z-index: 1;
}

.hero-content {
    flex: 1;
    max-width: 650px;
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-weight: 800;
    letter-spacing: -0.025em;
}

.text-highlight {
    color: var(--primary);
    position: relative;
    display: inline-block;
}

.text-highlight::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 8px;
    background-color: var(--primary-light);
    bottom: 5px;
    left: 0;
    z-index: -1;
    opacity: 0.5;
    border-radius: 4px;
}

.hero-desc {
    font-size: 1.35rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    font-weight: 400;
}

/* ===== 搜索工具区 ===== */
.search-container {
    width: 100%;
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: var(--radius-xl);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-lg), 0 0 30px rgba(37, 99, 235, 0.1);
    position: relative;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(226, 232, 240, 0.7);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    z-index: 5;
}

.search-container:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl), 0 0 40px rgba(37, 99, 235, 0.15);
}

.search-container::before {
    content: '';
    position: absolute;
    top: -10px;
    right: -10px;
    width: 80px;
    height: 80px;
    background: var(--primary-light);
    border-radius: 50%;
    opacity: 0.15;
    z-index: -1;
}

.search-container::after {
    content: '';
    position: absolute;
    bottom: -20px;
    left: -10px;
    width: 120px;
    height: 120px;
    background: var(--accent);
    border-radius: 50%;
    opacity: 0.1;
    z-index: -1;
}

.search-title {
    font-size: 1.5rem;
    color: var(--text-primary);
    font-weight: 700;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.search-title i {
    color: var(--primary);
}

.input-container {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.input-group {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
}

.prefix-icon {
    position: absolute;
    left: 1rem;
    color: var(--primary);
    font-size: 1.1rem;
}

#video-url {
    width: 100%;
    padding: 1rem 2.5rem;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: all 0.3s ease;
    outline: none;
    background-color: var(--background);
    box-shadow: var(--shadow-inner);
}

#video-url:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

.clear-btn {
    position: absolute;
    right: 1rem;
    color: var(--text-light);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.input-group:focus-within .clear-btn,
.clear-btn.visible {
    opacity: 1;
    pointer-events: auto;
}

.parse-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: var(--gradient-primary);
    color: white;
    padding: 1rem 2rem;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: var(--shadow), var(--shadow-glow);
    text-align: center;
    width: 100%;
    position: relative;
    overflow: hidden;
}

.parse-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 0.7s ease;
}

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

.parse-btn.active {
    transform: scale(1.02);
}

.parse-btn.pulse {
    animation: pulse 1s ease-in-out;
}

@keyframes pulse {
    0% {
        transform: scale(1);
        box-shadow: var(--shadow), var(--shadow-glow);
    }
    50% {
        transform: scale(1.05);
        box-shadow: var(--shadow-lg), 0 0 25px rgba(37, 99, 235, 0.6);
    }
    100% {
        transform: scale(1);
        box-shadow: var(--shadow), var(--shadow-glow);
    }
}

.parse-btn.loading {
    background-image: linear-gradient(135deg, #1d4ed8 0%, #3b82f6 100%);
    cursor: not-allowed;
    opacity: 0.9;
}

.parse-btn.button-pressed {
    transform: scale(0.98);
    box-shadow: var(--shadow-sm), 0 0 10px rgba(37, 99, 235, 0.3);
}

.parse-btn:hover {
    background-image: linear-gradient(135deg, #1d4ed8 0%, #3b82f6 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 20px rgba(37, 99, 235, 0.5);
}

.parse-btn:active {
    transform: translateY(0);
}

.tips {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
    padding: 0.5rem;
    border-radius: var(--radius);
    background-color: rgba(226, 232, 240, 0.5);
}

.tips i {
    color: var(--primary);
    margin-right: 0.25rem;
}

/* 信任徽章 */
.trust-badges {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background-color: rgba(255, 255, 255, 0.7);
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease, background-color 0.3s ease;
    flex: 1;
    min-width: 120px;
    justify-content: center;
    border: 1px solid rgba(226, 232, 240, 0.7);
    position: relative;
    overflow: hidden;
}

.badge::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(37, 99, 235, 0.1),
        transparent
    );
    transition: left 0.7s ease;
}

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

.badge:hover {
    transform: translateY(-2px);
    background-color: rgba(255, 255, 255, 0.9);
}

.badge i {
    color: var(--primary);
    font-size: 1.1rem;
}

.badge span {
    font-weight: 500;
}

/* 装饰元素 */
.decoration-container {
    position: absolute;
    top: 0;
    right: 0;
    width: 300px;
    height: 300px;
    overflow: hidden;
    opacity: 0.2;
    z-index: 1;
}

.hero-decoration {
    width: 100%;
    height: 100%;
    opacity: 0.6;
}

/* 响应式样式 */
@media (max-width: 768px) {
    .hero {
        min-height: auto;
        padding: 2rem 1rem 3rem;
    }
    
    .hero-title {
        font-size: 2.2rem;
    }
    
    .hero-desc {
        font-size: 1.1rem;
    }
    
    .decoration-container {
        display: none;
    }
    
    .search-container {
        padding: 1.5rem;
    }
    
    .main-nav {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: rgba(255, 255, 255, 0.98);
        box-shadow: var(--shadow);
        padding: 1.5rem;
        z-index: 90;
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        transform: translateY(-10px);
        opacity: 0;
        transition: all 0.3s ease;
    }
    
    .main-nav.active {
        display: block;
        transform: translateY(0);
        opacity: 1;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 0;
    }
    
    .main-nav li {
        margin: 0;
        width: 100%;
    }
    
    .main-nav a {
        padding: 1rem 0.75rem;
        border-radius: var(--radius);
        width: 100%;
        border-bottom: 1px solid var(--border);
    }
    
    .main-nav a:hover {
        background-color: rgba(37, 99, 235, 0.05);
    }
    
    .main-nav a::after {
        display: none;
    }
    
    .main-nav li:last-child a {
        border-bottom: none;
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    .trust-badges {
        flex-wrap: wrap;
    }
    
    .badge {
        min-width: 100px;
        padding: 0.5rem;
    }
}

@media (max-width: 576px) {
    .hero-title {
        font-size: 1.8rem;
    }
    
    .hero-desc {
        font-size: 1rem;
    }
    
    .search-container {
        padding: 1.2rem;
    }
    
    .search-title {
        font-size: 1.25rem;
    }
    
    .input-group,
    .parse-btn {
        width: 100%;
    }
    
    .badge {
        flex: 1 0 45%;
        min-width: auto;
    }
}

@media (min-width: 769px) {
    .input-container {
        flex-direction: row;
        align-items: stretch;
    }
    
    .parse-btn {
        width: auto;
        min-width: 160px;
    }
}

/* ===== 数据统计区域 ===== */
.stats-section {
    padding: 3rem 5%;
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
    color: white;
    position: relative;
    overflow: hidden;
    box-shadow: inset 0 4px 15px rgba(0, 0, 0, 0.1), inset 0 -4px 15px rgba(0, 0, 0, 0.1);
}

.stats-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.15) 0%, transparent 25%),
        radial-gradient(circle at 80% 70%, rgba(147, 197, 253, 0.15) 0%, transparent 35%);
    z-index: 1;
}

.stats-section::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
}

.stats-container {
    display: flex;
    justify-content: space-around;
    max-width: 1200px;
    margin: 0 auto;
    flex-wrap: wrap;
    gap: 2.5rem;
    position: relative;
    z-index: 2;
    padding: 1rem 0;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    position: relative;
    padding: 1.5rem 2rem;
    border-radius: var(--radius-lg);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    background-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    min-width: 240px;
    flex: 1;
    max-width: 350px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.stat-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.5);
    transition: all 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 15px 30px -5px rgba(0, 0, 0, 0.2);
    background-color: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.2);
}

.stat-item:hover::before {
    background-color: rgba(255, 255, 255, 0.8);
}

.stat-item::after {
    content: '';
    position: absolute;
    top: -100%;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        135deg,
        transparent,
        rgba(255, 255, 255, 0.2),
        transparent
    );
    transition: all 0.6s ease;
}

.stat-item:hover::after {
    top: 100%;
    left: 100%;
}

.stat-item i {
    font-size: 3rem;
    color: rgba(255, 255, 255, 0.9);
    background: rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.stat-item:hover i {
    transform: scale(1.1) rotate(5deg);
    background: rgba(255, 255, 255, 0.25);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
}

.stat-content {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.stat-number {
    font-size: 2.25rem;
    font-weight: 800;
    line-height: 1.1;
    text-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
    background: linear-gradient(135deg, #ffffff 0%, #e2e8f0 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    letter-spacing: -0.02em;
    position: relative;
}

.stat-number::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background-color: rgba(255, 255, 255, 0.5);
    border-radius: 3px;
}

.stat-title {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
}

/* 为统计数字添加计数动画效果 */
@keyframes countUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.stat-number {
    animation: countUp 1s cubic-bezier(0.215, 0.61, 0.355, 1) forwards;
    animation-delay: calc(var(--i, 0) * 0.2s);
}

/* 响应式优化 */
@media (max-width: 768px) {
    .stats-section {
        padding: 2rem 5%;
    }
    
    .stats-container {
        gap: 1.5rem;
    }
    
    .stat-item {
        min-width: 100%;
        padding: 1.25rem 1.5rem;
    }
    
    .stat-item i {
        font-size: 2.5rem;
        width: 60px;
        height: 60px;
    }
    
    .stat-number {
        font-size: 1.75rem;
    }
    
    .stat-title {
        font-size: 1rem;
    }
}

@media (max-width: 576px) {
    .stat-item {
        flex-direction: column;
        text-align: center;
        align-items: center;
        padding: 1.5rem 1rem;
        gap: 0.75rem;
    }
    
    .stat-item::before {
        width: 100%;
        height: 4px;
        top: 0;
        left: 0;
    }
    
    .stat-number::after {
        left: 50%;
        transform: translateX(-50%);
    }
}

/* ===== 结果区域 ===== */
.result-section {
    padding: 2rem 5%;
    display: none; /* 默认隐藏，解析后显示 */
    background-color: var(--background-alt);
}

.result-container {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--background);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    animation: fadeInUp 0.5s ease forwards;
    opacity: 0;
}

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

.result-container:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: var(--gradient-primary);
    color: white;
}

.result-header h3 {
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.1rem;
}

.close-btn {
    color: white;
    font-size: 1.25rem;
    opacity: 0.8;
    transition: opacity 0.2s ease;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
}

.close-btn:hover {
    opacity: 1;
    background-color: rgba(255, 255, 255, 0.2);
}

.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 1.5rem;
    display: none;
}

.spinner {
    width: 50px;
    height: 50px;
    animation: rotate 2s linear infinite;
    margin-bottom: 1rem;
}

.spinner .path {
    stroke: var(--primary);
    stroke-linecap: round;
    animation: dash 1.5s ease-in-out infinite;
}

@keyframes rotate {
    100% {
        transform: rotate(360deg);
    }
}

@keyframes dash {
    0% {
        stroke-dasharray: 1, 150;
        stroke-dashoffset: 0;
    }
    50% {
        stroke-dasharray: 90, 150;
        stroke-dashoffset: -35;
    }
    100% {
        stroke-dasharray: 90, 150;
        stroke-dashoffset: -124;
    }
}

.loading-spinner p {
    color: var(--text-secondary);
}

.result-content {
    padding: 1.5rem;
    display: none;
}

.video-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.video-thumbnail {
    flex-shrink: 0;
    border-radius: var(--radius);
    overflow: hidden;
    background-color: var(--background-alt);
    aspect-ratio: 16 / 9;
    box-shadow: var(--shadow);
    position: relative;
}

.video-thumbnail::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, transparent 80%, rgba(0, 0, 0, 0.2) 100%);
    pointer-events: none;
}

.video-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.video-thumbnail:hover img {
    transform: scale(1.05);
}

.video-details {
    flex: 1;
}

.video-details h4 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    line-height: 1.5;
    font-weight: 700;
}

.action-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.download-btn,
.play-btn,
.copy-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius);
    font-weight: 500;
    transition: all 0.3s ease;
    min-width: 130px;
    position: relative;
    overflow: hidden;
}

.download-btn::before,
.play-btn::before,
.copy-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 0.7s ease;
}

.download-btn:hover::before,
.play-btn:hover::before,
.copy-btn:hover::before {
    left: 100%;
}

.download-btn.button-pressed,
.play-btn.button-pressed,
.copy-btn.button-pressed {
    transform: scale(0.98);
}

.download-btn {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow);
}

.download-btn:hover {
    background-image: linear-gradient(135deg, #1d4ed8 0%, #3b82f6 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 15px rgba(37, 99, 235, 0.3);
}

.play-btn {
    background: var(--gradient-secondary);
    color: white;
    box-shadow: var(--shadow);
}

.play-btn:hover {
    background-image: linear-gradient(135deg, #0284c7 0%, #38bdf8 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 15px rgba(14, 165, 233, 0.3);
}

.copy-btn {
    background-color: var(--background-alt);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.copy-btn:hover {
    background-color: var(--border);
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.video-player-container {
    padding: 1.5rem;
    display: none;
}

.video-player-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.video-player-header h4 {
    font-size: 1.125rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
}

.video-player-header .close-btn {
    color: var(--text-primary);
    background-color: rgba(0, 0, 0, 0.05);
}

.video-wrapper {
    position: relative;
    width: 100%;
    padding-top: 56.25%; /* 16:9宽高比 */
    border-radius: var(--radius);
    overflow: hidden;
    background-color: black;
    box-shadow: var(--shadow-lg);
}

#video-player {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.error-message {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    text-align: center;
}

.error-message i {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

/* 重试按钮样式 */
.retry-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-top: 1.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 50px;
    background: linear-gradient(135deg, #2563eb, #3b82f6);
    color: #ffffff;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 10px rgba(59, 130, 246, 0.3);
}

.retry-btn:hover {
    background: linear-gradient(135deg, #1d4ed8, #2563eb);
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(59, 130, 246, 0.4);
}

.retry-btn i {
    margin-right: 0.5rem;
    font-size: 0.9rem;
}

.retry-btn:active {
    transform: translateY(1px);
    box-shadow: 0 2px 5px rgba(59, 130, 246, 0.4);
}

/* ===== 功能特点区域 ===== */
.features-section {
    padding: 6rem 5%;
    background-color: var(--background);
    position: relative;
    overflow: hidden;
    background-image: 
        linear-gradient(to right, rgba(241, 245, 249, 0.3) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(241, 245, 249, 0.3) 1px, transparent 1px);
    background-size: 20px 20px;
}

.features-section::before {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(147, 197, 253, 0.15) 0%, rgba(147, 197, 253, 0.05) 50%, transparent 70%);
    top: -200px;
    left: -150px;
    z-index: 0;
    filter: blur(20px);
}

.features-section::after {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(14, 165, 233, 0.1) 0%, rgba(14, 165, 233, 0.03) 50%, transparent 70%);
    bottom: -100px;
    right: -50px;
    z-index: 0;
    filter: blur(20px);
}

.features-section .section-title {
    position: relative;
    z-index: 2;
    margin-bottom: 3.5rem;
}

.features-section .section-title i {
    background: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 2px 10px rgba(239, 68, 68, 0.2);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
    perspective: 1000px;
}

.feature-card {
    padding: 3rem 2rem;
    background-color: var(--background);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
    text-align: center;
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
    z-index: 1;
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s cubic-bezier(0.23, 1, 0.32, 1);
}

.feature-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, 
        rgba(255, 255, 255, 0) 50%,
        rgba(247, 250, 252, 0.5) 100%);
    z-index: -1;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.feature-card:hover {
    transform: translateY(-15px) scale(1.02);
    box-shadow: 0 20px 30px -10px rgba(36, 99, 235, 0.15), 
                0 10px 20px -5px rgba(0, 0, 0, 0.05);
    border-color: rgba(37, 99, 235, 0.2);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card:hover::after {
    opacity: 1;
}

.feature-card.fade-in {
    opacity: 0;
    transform: translateY(30px);
    animation-delay: calc(var(--i, 0) * 0.15s);
}

.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    border-radius: 28%;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(59, 130, 246, 0.15) 100%);
    color: var(--primary);
    font-size: 2rem;
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
    transition: all 0.4s ease;
    box-shadow: 0 10px 15px -5px rgba(37, 99, 235, 0.2);
    transform: rotate(-5deg);
}

.feature-icon::after {
    content: '';
    position: absolute;
    width: 110%;
    height: 110%;
    border-radius: 28%;
    border: 1.5px dashed var(--primary-light);
    animation: spin 20s linear infinite;
    top: -5%;
    left: -5%;
    z-index: -1;
    transition: all 0.3s ease;
}

.feature-icon::before {
    content: '';
    position: absolute;
    width: 90%;
    height: 90%;
    border-radius: 24%;
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.8), transparent 70%);
    z-index: 1;
    opacity: 0.5;
    transition: opacity 0.3s ease;
}

.feature-card:hover .feature-icon {
    transform: rotate(0deg) scale(1.1);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.15) 0%, rgba(59, 130, 246, 0.25) 100%);
    box-shadow: 0 15px 25px -5px rgba(37, 99, 235, 0.25);
}

.feature-card:hover .feature-icon::after {
    border-color: var(--primary);
    animation-duration: 10s;
}

.feature-card:hover .feature-icon::before {
    opacity: 0.7;
}

.feature-card:hover .feature-icon i {
    transform: scale(1.1);
}

.feature-icon i {
    position: relative;
    z-index: 2;
    transition: transform 0.3s ease;
    background: linear-gradient(135deg, var(--primary) 0%, #1d4ed8 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.feature-card h3 {
    font-size: 1.6rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-weight: 700;
    position: relative;
    display: inline-block;
    transition: all 0.3s ease;
}

.feature-card:hover h3 {
    transform: translateY(-3px);
    color: var(--primary);
}

.feature-card h3::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: -5px;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
    transform: translateX(-50%);
    transition: width 0.3s ease;
    opacity: 0;
}

.feature-card:hover h3::after {
    width: 70%;
    opacity: 1;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    transition: all 0.3s ease;
    max-width: 90%;
    margin: 0 auto;
}

.feature-card:hover p {
    color: var(--text-primary);
}

/* 响应式优化 */
@media (max-width: 768px) {
    .features-section {
        padding: 4rem 5%;
    }
    
    .features-grid {
        gap: 1.5rem;
    }
    
    .feature-card {
        padding: 2rem 1.5rem;
    }
    
    .feature-icon {
        width: 70px;
        height: 70px;
        font-size: 1.75rem;
    }
    
    .feature-card h3 {
        font-size: 1.4rem;
    }
}

@media (max-width: 576px) {
    .features-grid {
        grid-template-columns: 1fr;
        max-width: 350px;
    }
    
    .feature-card {
        padding: 2.5rem 1.5rem;
    }
}

/* ===== 新增动画类 ===== */
.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

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

/* Toast 提示框 */
.toast {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 1rem;
    z-index: 1000;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.3s ease, transform 0.3s ease;
    pointer-events: none;
    display: flex;
    align-items: center;
    min-width: 300px;
}

.toast.visible {
    opacity: 1;
    transform: translateY(0);
}

.toast.success {
    border-left: 4px solid var(--success);
}

.toast.success .success {
    display: inline-block;
}

.toast.success .error {
    display: none;
}

.toast.error {
    border-left: 4px solid var(--error);
}

.toast.error .success {
    display: none;
}

.toast.error .error {
    display: inline-block;
}

.toast-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.toast-icon {
    font-size: 1.5rem;
}

.toast-icon.success {
    color: var(--success);
}

.toast-icon.error {
    color: var(--error);
}

.toast-message {
    font-weight: 500;
    color: var(--text-primary);
}

/* 统计区域背景元素 */
.stats-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    opacity: 0.3;
    z-index: 1;
    pointer-events: none;
}

.stats-circle {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    animation: floatingCircle 10s infinite ease-in-out;
}

.stats-circle-1 {
    width: 200px;
    height: 200px;
    left: -50px;
    top: -50px;
    animation-delay: 0s;
}

.stats-circle-2 {
    width: 120px;
    height: 120px;
    right: 15%;
    top: 30%;
    animation-delay: 2s;
}

.stats-circle-3 {
    width: 160px;
    height: 160px;
    right: -40px;
    bottom: -40px;
    animation-delay: 4s;
}

@keyframes floatingCircle {
    0% {
        transform: translateY(0) scale(1);
    }
    50% {
        transform: translateY(-20px) scale(1.05);
    }
    100% {
        transform: translateY(0) scale(1);
    }
}

.feature-number {
    position: absolute;
    bottom: 1.5rem;
    right: 1.5rem;
    font-size: 2.5rem;
    font-weight: 800;
    opacity: 0.1;
    color: var(--primary);
    transition: all 0.3s ease;
    z-index: 0;
}

.feature-card:hover .feature-number {
    opacity: 0.15;
    transform: scale(1.1);
}

.feature-shape {
    position: absolute;
    bottom: 10px;
    right: 10px;
    width: 90px;
    height: 90px;
    opacity: 0.06;
    z-index: 0;
    transform: rotate(15deg);
    transition: all 0.5s ease;
}

.feature-shape svg {
    width: 100%;
    height: 100%;
    color: var(--primary);
}

.feature-card:hover .feature-shape {
    transform: rotate(0deg) scale(1.1);
    opacity: 0.08;
}

.features-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.grid-line {
    position: absolute;
    width: 100%;
    height: 100%;
    background-size: 30px 30px;
    opacity: 0.4;
}

@keyframes featureCardAppear {
    0% {
        opacity: 0;
        transform: translateY(30px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-card.animated {
    animation: featureCardAppear 0.6s ease forwards;
    opacity: 0;
}

.feature-card:nth-child(1) {
    animation-delay: 0.1s;
}

.feature-card:nth-child(2) {
    animation-delay: 0.25s;
}

.feature-card:nth-child(3) {
    animation-delay: 0.4s;
}

.feature-card:nth-child(4) {
    animation-delay: 0.55s;
}

/* ===== 使用教程区域 ===== */
.tutorial-section {
    padding: 6rem 5%;
    background-color: var(--background);
    position: relative;
    overflow: hidden;
}

.tutorial-section::before {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.04) 0%, transparent 70%);
    top: -100px;
    right: -100px;
    z-index: 0;
}

.tutorial-section::after {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(14, 165, 233, 0.05) 0%, transparent 60%);
    bottom: -50px;
    left: -50px;
    z-index: 0;
}

.steps-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2.5rem;
    max-width: 1200px;
    margin: 2rem auto 0;
    position: relative;
    z-index: 1;
}

.step-card {
    flex: 1;
    min-width: 300px;
    max-width: 350px;
    background-color: var(--background);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
    padding: 2.5rem;
    position: relative;
    border: 1px solid var(--border);
    overflow: hidden;
}

.step-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(14, 165, 233, 0.03) 0%, rgba(37, 99, 235, 0.03) 100%);
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: -1;
}

.step-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(37, 99, 235, 0.15);
}

.step-number {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    width: 3rem;
    height: 3rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 1.5rem;
    z-index: 1;
    box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3);
    transition: all 0.3s ease;
}

.step-card:hover .step-number {
    transform: scale(1.1) rotate(10deg);
    box-shadow: 0 6px 15px rgba(37, 99, 235, 0.4);
}

.step-content {
    position: relative;
    z-index: 1;
}

.step-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-weight: 700;
    padding-right: 2.5rem;
    transition: color 0.3s ease;
}

.step-card:hover h3 {
    color: var(--primary);
}

.step-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.5rem;
    transition: color 0.3s ease;
}

.step-card:hover p {
    color: var(--text-primary);
}

.step-image {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(14, 165, 233, 0.1) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 1.5rem;
    transition: all 0.3s ease;
    position: relative;
}

.step-image::after {
    content: '';
    position: absolute;
    width: 110%;
    height: 110%;
    border-radius: 50%;
    border: 2px dashed var(--primary-light);
    top: -5%;
    left: -5%;
    animation: spin 20s linear infinite;
    opacity: 0.7;
    z-index: -1;
}

.step-card:hover .step-image {
    transform: scale(1.1);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.15) 0%, rgba(14, 165, 233, 0.15) 100%);
}

.tutorial-icon {
    font-size: 2.5rem;
    color: var(--primary);
    transition: all 0.3s ease;
}

.step-card:hover .tutorial-icon {
    transform: scale(1.1);
}

.step-card.fade-in {
    opacity: 0;
    transform: translateY(30px);
    animation-delay: calc(var(--i, 0) * 0.15s);
}

.step-card:nth-child(1) {
    border-top: 4px solid var(--primary);
}

.step-card:nth-child(2) {
    border-top: 4px solid var(--accent);
}

.step-card:nth-child(3) {
    border-top: 4px solid var(--success);
}

@media (max-width: 768px) {
    .tutorial-section {
        padding: 4rem 5%;
    }
    
    .steps-container {
        flex-direction: column;
        align-items: center;
        gap: 2rem;
    }
    
    .step-card {
        width: 100%;
        min-width: 0;
        max-width: 450px;
        padding: 2rem;
    }
    
    .step-number {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1.2rem;
    }
    
    .step-card h3 {
        font-size: 1.3rem;
    }
}

/* ===== 支持平台区域 ===== */
.platforms-section {
    padding: 5rem 5%;
    background-color: var(--background-alt);
    position: relative;
    overflow: hidden;
    background-image: 
        radial-gradient(circle at 10% 10%, rgba(147, 197, 253, 0.1) 0%, transparent 70%),
        radial-gradient(circle at 90% 90%, rgba(14, 165, 233, 0.08) 0%, transparent 70%);
}

.platforms-section::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(to right, rgba(226, 232, 240, 0.6) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(226, 232, 240, 0.6) 1px, transparent 1px);
    background-size: 40px 40px;
    opacity: 0.4;
    top: 0;
    left: 0;
    z-index: 0;
}

.platforms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.platform-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem 1.5rem;
    background-color: var(--background);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    text-align: center;
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
    gap: 1rem;
    cursor: pointer;
    z-index: 1;
}

.platform-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(14, 165, 233, 0.05) 0%, rgba(37, 99, 235, 0.05) 100%);
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: -1;
}

.platform-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 25px -10px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    border-color: rgba(37, 99, 235, 0.2);
}

.platform-card:hover::before {
    opacity: 1;
}

.platform-icon {
    font-size: 2.5rem;
    color: var(--primary);
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    display: inline-block;
    margin-bottom: 0.5rem;
    transition: all 0.3s ease;
    position: relative;
}

.platform-icon::after {
    content: '';
    position: absolute;
    width: 120%;
    height: 120%;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.2) 0%, transparent 70%);
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.platform-card:hover .platform-icon {
    transform: scale(1.1) rotate(5deg);
}

.platform-card:hover .platform-icon::after {
    opacity: 1;
}

.platform-card span {
    font-weight: 500;
    color: var(--text-primary);
    transition: color 0.3s ease;
}

.platform-card:hover span {
    color: var(--primary);
}

.platform-card.fade-in {
    opacity: 0;
    transform: translateY(30px);
    animation-delay: calc(var(--i, 0) * 0.1s);
}

@media (max-width: 768px) {
    .platforms-section {
        padding: 4rem 5%;
    }
    
    .platforms-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 1.5rem;
    }
    
    .platform-card {
        padding: 1.5rem 1rem;
    }
    
    .platform-icon {
        font-size: 2rem;
    }
}

@media (max-width: 576px) {
    .platforms-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: 1rem;
    }
    
    .platform-card {
        padding: 1.25rem 0.75rem;
    }
    
    .platform-icon {
        font-size: 1.75rem;
    }
}

/* ===== 用户评价区域 ===== */
.testimonials-section {
    padding: 6rem 5%;
    background-color: var(--background-alt);
    position: relative;
    overflow: hidden;
}

.testimonials-section::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%232563eb' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.4;
    z-index: 0;
}

.testimonials-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2.5rem;
    max-width: 1200px;
    margin: 2rem auto 0;
    position: relative;
    z-index: 1;
}

.testimonial-card {
    flex: 1;
    min-width: 300px;
    max-width: 500px;
    background-color: var(--background);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 2rem;
    position: relative;
    border: 1px solid var(--border);
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
    overflow: hidden;
}

.testimonial-card::before {
    content: '"';
    position: absolute;
    top: -20px;
    right: 20px;
    font-size: 10rem;
    font-family: Georgia, serif;
    color: rgba(37, 99, 235, 0.07);
    line-height: 1;
    z-index: 0;
}

.testimonial-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(37, 99, 235, 0.15);
}

.testimonial-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.testimonial-avatar i {
    font-size: 2rem;
    color: white;
}

.testimonial-card:hover .testimonial-avatar {
    transform: scale(1.1);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
}

.testimonial-content {
    position: relative;
    z-index: 1;
}

.testimonial-rating {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 1rem;
}

.testimonial-rating i {
    color: var(--warning);
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.testimonial-card:hover .testimonial-rating i {
    transform: scale(1.1);
    animation: starPulse 1.5s infinite alternate;
    animation-delay: calc(var(--i, 0) * 0.1s);
}

@keyframes starPulse {
    0% {
        transform: scale(1);
    }
    100% {
        transform: scale(1.2);
    }
}

.testimonial-text {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-style: italic;
    position: relative;
    z-index: 1;
}

.testimonial-author {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-align: right;
}

.testimonial-card.fade-in {
    opacity: 0;
    transform: translateY(30px);
    animation-delay: calc(var(--i, 0) * 0.15s);
}

@media (max-width: 768px) {
    .testimonials-section {
        padding: 4rem 5%;
    }
    
    .testimonials-container {
        flex-direction: column;
        align-items: center;
        gap: 2rem;
    }
    
    .testimonial-card {
        width: 100%;
        min-width: 0;
        max-width: 500px;
    }
}

/* ===== FAQ部分样式 ===== */
.faq-section {
    padding: 5rem 5%;
    background-color: var(--background);
    position: relative;
    overflow: hidden;
}

.faq-section::before, 
.faq-section::after {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.07) 0%, rgba(37, 99, 235, 0) 70%);
    z-index: 0;
}

.faq-section::before {
    top: -100px;
    left: -100px;
}

.faq-section::after {
    bottom: -100px;
    right: -100px;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.section-title-container.centered {
    text-align: center;
    margin-bottom: 3rem;
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.faq-item {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all 0.3s ease;
    border: 1px solid var(--border);
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.5s ease forwards;
    animation-delay: calc(var(--index) * 0.1s);
}

.faq-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.faq-item.active {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.faq-question {
    padding: 1.25rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.faq-question:hover {
    color: var(--primary);
}

.faq-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--background-alt);
    color: var(--primary);
    transition: all 0.3s ease;
    position: relative;
}

.faq-toggle::before,
.faq-toggle::after {
    content: '';
    position: absolute;
    background-color: var(--primary);
    border-radius: 1px;
    transition: all 0.3s ease;
}

.faq-toggle::before {
    width: 12px;
    height: 2px;
}

.faq-toggle::after {
    width: 2px;
    height: 12px;
}

.faq-item.active .faq-toggle {
    background-color: var(--primary);
}

.faq-item.active .faq-toggle::before,
.faq-item.active .faq-toggle::after {
    background-color: white;
}

.faq-item.active .faq-toggle::after {
    transform: rotate(90deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    padding: 0 1.25rem;
    color: var(--text-secondary);
    line-height: 1.6;
    transition: all 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 1000px;
    padding-bottom: 1.25rem;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    .faq-section {
        padding: 4rem 5%;
    }
    
    .faq-question {
        padding: 1rem;
        font-size: 0.95rem;
    }
    
    .faq-answer {
        padding: 0 1rem;
        font-size: 0.9rem;
    }
    
    .faq-item.active .faq-answer {
        padding-bottom: 1rem;
    }
}

/* ===== 底部导航 ===== */
.footer-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 3rem 5%;
    background-color: rgba(247, 250, 252, 0.7);
    border-bottom: 1px solid var(--border);
    position: relative;
    z-index: 1;
}

.footer-links {
    display: flex;
    justify-content: space-between;
    gap: 2rem;
    width: 100%;
}

.footer-column {
    min-width: 140px;
    flex: 1;
}

.footer-column a {
    color: var(--text-primary);
    text-decoration: none;
    transition: all 0.3s ease;
    position: relative;
}

.footer-column a::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--gradient-primary);
    transition: width 0.3s ease;
    opacity: 0;
}

.footer-column a:hover {
    color: var(--primary);
    transform: translateX(3px);
}

.footer-column a:hover::before {
    width: 100%;
    opacity: 1;
}

.footer-column a i {
    font-size: 1rem;
    color: var(--primary-light);
    transition: all 0.3s ease;
}

.footer-column a:hover i {
    color: var(--primary);
    transform: scale(1.1);
}

.footer-bottom {
    text-align: center;
    padding: 1.5rem 5%;
    background-color: rgba(247, 250, 252, 0.7);
    border-top: 1px solid var(--border);
    position: relative;
    z-index: 1;
}

.footer-bottom p {
    margin: 0.5rem 0;
    font-size: 0.9rem;
    color: var(--text-light);
}

.footer-bottom i {
    color: var(--primary-light);
}

.footer-link {
    color: var(--primary);
    text-decoration: none;
    transition: all 0.3s ease;
    position: relative;
}

.footer-link::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 1px;
    background-color: var(--primary);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s ease;
}

.footer-link:hover {
    color: var(--primary-dark);
}

.footer-link:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* ===== 页脚部分样式 ===== */
footer {
    background-color: var(--background-alt);
    color: var(--text-secondary);
    position: relative;
    overflow: hidden;
    border-top: 1px solid var(--border);
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%232563eb' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.7;
    z-index: 0;
}

.footer-top {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 3rem;
    padding: 4rem 5%;
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.logo-icon.small {
    width: 32px;
    height: 32px;
    color: var(--primary);
    transition: all 0.3s ease;
}

.footer-logo span {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.footer-logo:hover .logo-icon.small {
    transform: rotate(10deg) scale(1.1);
    color: var(--primary-dark);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 3rem;
    flex: 1;
    justify-content: flex-end;
}

.footer-column {
    min-width: 160px;
}

.footer-column h4 {
    color: var(--text-primary);
    font-size: 1.1rem;
    margin-bottom: 1.25rem;
    font-weight: 600;
    position: relative;
    display: inline-block;
}

.footer-column h4::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.footer-column ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-column li {
    margin-bottom: 0.75rem;
}

.footer-column a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    position: relative;
}

.footer-column a::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--gradient-primary);
    transition: width 0.3s ease;
    opacity: 0;
}

.footer-column a:hover {
    color: var(--primary);
    transform: translateX(3px);
}

.footer-column a:hover::before {
    width: 100%;
    opacity: 1;
}

.footer-column a i {
    font-size: 1rem;
    color: var(--primary-light);
    transition: all 0.3s ease;
}

.footer-column a:hover i {
    color: var(--primary);
    transform: scale(1.1);
}

.footer-bottom {
    text-align: center;
    padding: 1.5rem 5%;
    background-color: rgba(247, 250, 252, 0.7);
    border-top: 1px solid var(--border);
    position: relative;
    z-index: 1;
}

.footer-bottom p {
    margin: 0.5rem 0;
    font-size: 0.9rem;
    color: var(--text-light);
}

.footer-bottom i {
    color: var(--primary-light);
}

.footer-link {
    color: var(--primary);
    text-decoration: none;
    transition: all 0.3s ease;
    position: relative;
}

.footer-link::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 1px;
    background-color: var(--primary);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s ease;
}

.footer-link:hover {
    color: var(--primary-dark);
}

.footer-link:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

@media (max-width: 768px) {
    .footer-top {
        padding: 3rem 5%;
        flex-direction: column;
        gap: 2rem;
    }
    
    .footer-links {
        justify-content: flex-start;
        gap: 2rem;
        width: 100%;
    }
    
    .footer-column {
        min-width: 140px;
        flex: 1;
    }
}

@media (max-width: 576px) {
    .footer-links {
        flex-direction: column;
        gap: 2rem;
    }
    
    .footer-column {
        width: 100%;
    }
}

/* 视频播放受限样式 */
.restriction-notice {
    padding: 10px;
    margin-bottom: 15px;
    background-color: #fff3cd;
    color: #856404;
    border-radius: 6px;
    font-size: 14px;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid #ffeeba;
}

.restriction-notice i {
    margin-right: 8px;
    font-size: 16px;
    color: #e0a800;
}

.play-btn.restricted {
    background-color: #f8d7da;
    border-color: #f5c6cb;
    color: #721c24;
    cursor: not-allowed;
}

.play-btn.restricted:hover {
    background-color: #f1b0b7;
    transform: none;
    box-shadow: none;
}