/* ===== 全局变量 ===== */
:root {
    --primary-color: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --accent-color: #06b6d4;
    --accent-pink: #ec4899;
    --bg-dark: #0f0f1a;
    --bg-card: #1a1a2e;
    --bg-card-hover: #252542;
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --gradient-main: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #d946ef 100%);
    --gradient-glow: linear-gradient(135deg, rgba(99, 102, 241, 0.5) 0%, rgba(139, 92, 246, 0.3) 100%);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
}

/* ===== 基础重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(6, 182, 212, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(15, 15, 26, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    padding: 16px 0;
    transition: all 0.3s ease;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.nav-brand img {
    width: 40px;
    height: 40px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 12px;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.nav-menu a::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-main);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.nav-menu a:hover {
    color: var(--text-primary);
    background: var(--glass-bg);
}

.btn-download {
    background: var(--gradient-main);
    color: white;
    border: none;
    padding: 12px 28px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5);
}

/* ===== Hero 区域 ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: var(--gradient-main);
    filter: blur(150px);
    opacity: 0.3;
    border-radius: 50%;
    animation: float 8s ease-in-out infinite;
}

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

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    animation: fadeInUp 0.8s ease-out;
}

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

.hero h1 {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 22px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.btn-primary {
    background: var(--gradient-main);
    color: white;
    padding: 16px 36px;
    border-radius: 16px;
    font-weight: 600;
    font-size: 16px;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    padding: 16px 36px;
    border-radius: 16px;
    font-weight: 600;
    font-size: 16px;
    border: 2px solid var(--glass-border);
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background: var(--glass-bg);
    border-color: var(--primary-color);
}

.hero-version {
    color: var(--text-muted);
    font-size: 14px;
}

.hero-image {
    animation: fadeInRight 0.8s ease-out 0.2s both;
}

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

.browser-preview {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    overflow: hidden;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5),
                0 0 100px rgba(99, 102, 241, 0.2);
}

.preview-header {
    background: var(--bg-card-hover);
    padding: 16px 20px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.preview-dots {
    display: flex;
    gap: 8px;
}

.preview-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.preview-dots span:nth-child(1) {
    background: #ef4444;
}

.preview-dots span:nth-child(2) {
    background: #f59e0b;
}

.preview-dots span:nth-child(3) {
    background: #10b981;
}

.preview-content {
    padding: 30px;
}

.preview-banner {
    height: 180px;
    background: var(--gradient-main);
    border-radius: 16px;
    margin-bottom: 20px;
    position: relative;
    overflow: hidden;
}

.preview-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(45deg, transparent 40%, rgba(255,255,255,0.1) 50%, transparent 60%);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.preview-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.preview-card {
    height: 100px;
    background: var(--bg-card-hover);
    border-radius: 12px;
    animation: pulse 2s infinite;
}

.preview-card:nth-child(1) { animation-delay: 0s; }
.preview-card:nth-child(2) { animation-delay: 0.3s; }
.preview-card:nth-child(3) { animation-delay: 0.6s; }

@keyframes pulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* ===== 特色功能 ===== */
.features {
    padding: 100px 0;
    position: relative;
}

.section-title {
    font-size: 42px;
    font-weight: 800;
    text-align: center;
    margin-bottom: 16px;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 18px;
    margin-bottom: 60px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.feature-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 36px;
    text-align: center;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-main);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.feature-card:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: var(--primary-light);
    box-shadow: 0 20px 40px rgba(99, 102, 241, 0.3);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-main);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 36px;
    position: relative;
    z-index: 1;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    position: relative;
    z-index: 1;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
    position: relative;
    z-index: 1;
}

/* ===== 下载区域 ===== */
.download-section {
    padding: 100px 0;
    background: var(--bg-card);
}

.download-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    max-width: 1000px;
    margin: 0 auto;
}

.download-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 40px 30px;
    text-align: center;
    transition: all 0.4s ease;
}

.download-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary-light);
    box-shadow: 0 20px 40px rgba(99, 102, 241, 0.2);
}

.download-icon {
    font-size: 56px;
    margin-bottom: 20px;
}

.download-card h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 12px;
}

.download-card > p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.btn-download-card {
    background: var(--gradient-main);
    color: white;
    border: none;
    padding: 14px 32px;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
}

.btn-download-card:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
}

/* ===== 使用指南 ===== */
.guides {
    padding: 100px 0;
}

.guides-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.guide-item {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 28px;
    transition: all 0.3s ease;
}

.guide-item:hover {
    background: var(--bg-card-hover);
    transform: translateX(8px);
    border-color: var(--primary-light);
}

.guide-item h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.guide-item > p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 16px;
}

.read-more {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap 0.3s ease;
}

.read-more:hover {
    gap: 8px;
}

/* ===== FAQ ===== */
.faq-section {
    padding: 100px 0;
    background: var(--bg-card);
}

.faq-accordion {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    margin-bottom: 12px;
    overflow: hidden;
}

.faq-question {
    padding: 20px 24px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    transition: all 0.3s ease;
}

.faq-question:hover {
    background: var(--bg-card-hover);
}

.faq-icon {
    width: 28px;
    height: 28px;
    background: var(--gradient-main);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 200px;
    padding: 0 24px 20px;
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--bg-dark);
    border-top: 1px solid var(--glass-border);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 12px;
}

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 14px;
}

.footer-section a:hover {
    color: var(--primary-light);
}

.social-links {
    display: flex;
    gap: 12px;
}

.social-links a {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 10px 18px;
    border-radius: 10px;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--glass-border);
    color: var(--text-muted);
    font-size: 14px;
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-cta {
        justify-content: center;
    }

    .hero h1 {
        font-size: 42px;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .hero h1 {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .features-grid,
    .download-cards,
    .guides-list {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }

    .section-title {
        font-size: 32px;
    }
}

@media (max-width: 480px) {
    .hero-cta {
        flex-direction: column;
    }

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

    .container {
        padding: 0 16px;
    }
}

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

::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

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

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}