/* ===== 基础样式 ===== */
:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --secondary: #8b5cf6;
    --bg: #ffffff;
    --bg-secondary: #f8fafc;
    --text: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --radius-sm: 8px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
    font-size: 15px;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-ghost {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-ghost:hover {
    background: var(--bg-secondary);
}

.btn-outline {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
}

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

.btn-sm {
    padding: 8px 16px;
    font-size: 14px;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}

.btn .icon {
    width: 18px;
    height: 18px;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: all 0.3s;
}

.navbar.scrolled {
    border-bottom-color: var(--border);
    box-shadow: var(--shadow);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    font-weight: 700;
    font-size: 20px;
    color: var(--text);
}

.logo-img {
    width: 36px;
    height: 36px;
    border-radius: 8px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--primary);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: all 0.3s;
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: white;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.mobile-menu.active {
    display: block;
}

.mobile-menu a {
    display: block;
    padding: 12px 0;
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    border-bottom: 1px solid var(--border);
}

.mobile-menu a:last-child {
    border-bottom: none;
}

/* ===== Hero ===== */
.hero {
    padding: 140px 0 60px;
    background: linear-gradient(180deg, #f0f7ff 0%, #ffffff 100%);
}

.hero .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.hero-badge {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 20px;
}

.hero h1 {
    font-size: 48px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.7;
}

.hero-desc strong {
    color: var(--text);
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
    justify-content: center;
}

.hero-stats {
    display: flex;
    gap: 48px;
    justify-content: center;
    margin-bottom: 60px;
}

.stat {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.hero-image {
    position: relative;
    width: 100%;
    max-width: 1200px;
}

.hero-image-wrapper {
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.screenshot-main {
    width: 100%;
    display: block;
    border-radius: 16px;
}

.hero-image-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120%;
    height: 120%;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, transparent 70%);
    z-index: -1;
}


/* ===== 核心优势 ===== */
.advantages {
    padding: 80px 0;
    background: var(--bg);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.advantage-card {
    padding: 32px;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    transition: all 0.3s;
}

.advantage-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.advantage-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.advantage-icon svg {
    width: 28px;
    height: 28px;
}

.icon-blue {
    background: rgba(59, 130, 246, 0.1);
    color: #3b82f6;
}

.icon-green {
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
}

.icon-purple {
    background: rgba(139, 92, 246, 0.1);
    color: #8b5cf6;
}

.icon-orange {
    background: rgba(249, 115, 22, 0.1);
    color: #f97316;
}

.advantage-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
}

.advantage-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== 功能特性 ===== */
.features {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
}

.section-header p {
    font-size: 18px;
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    padding: 32px;
    background: white;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: all 0.3s;
}

.feature-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

.feature-large {
    grid-column: span 2;
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.feature-icon svg {
    width: 24px;
    height: 24px;
    color: var(--primary);
}

.feature-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.feature-list {
    margin-top: 16px;
    padding-left: 20px;
}

.feature-list li {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

/* ===== 支持格式 ===== */
.formats {
    padding: 80px 0;
    background: var(--bg);
}

.formats-grid {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 16px;
}

.format-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 24px 32px;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    min-width: 120px;
}

.format-ext {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.format-name {
    font-size: 13px;
    color: var(--text-secondary);
}

.format-more {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
}

/* ===== 界面预览 ===== */
.screenshots {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.screenshot-item {
    text-align: center;
}

.screenshot-item img {
    width: 100%;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 16px;
    background: #e2e8f0;
    aspect-ratio: 16/10;
    object-fit: cover;
}

.screenshot-item p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ===== 开发计划 ===== */
.roadmap {
    padding: 100px 0;
    background: var(--bg);
}

.roadmap-timeline {
    max-width: 700px;
    margin: 0 auto;
    position: relative;
}

.roadmap-timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border);
}

.roadmap-item {
    position: relative;
    padding-left: 50px;
    padding-bottom: 40px;
}

.roadmap-item:last-child {
    padding-bottom: 0;
}

.roadmap-marker {
    position: absolute;
    left: 6px;
    top: 4px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--border);
    border: 4px solid white;
}

.roadmap-item.done .roadmap-marker {
    background: #22c55e;
}

.roadmap-item.current .roadmap-marker {
    background: var(--primary);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.2);
}

.roadmap-item.future .roadmap-marker {
    background: var(--text-secondary);
}

.roadmap-content {
    background: var(--bg-secondary);
    padding: 24px;
    border-radius: var(--radius);
}

.roadmap-status {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
    margin-bottom: 12px;
}

.roadmap-item.done .roadmap-status {
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
}

.roadmap-item.current .roadmap-status {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary);
}

.roadmap-item.future .roadmap-status {
    background: rgba(100, 116, 139, 0.1);
    color: var(--text-secondary);
}

.roadmap-content h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
}

.roadmap-content ul {
    padding-left: 20px;
}

.roadmap-content li {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.roadmap-note {
    margin-top: 12px;
    font-size: 13px;
    color: var(--text-secondary);
    font-style: italic;
}

/* ===== 技术栈 ===== */
.tech-stack {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
    max-width: 800px;
    margin: 0 auto;
}

.tech-group h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-secondary);
}

.tech-items {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tech-item {
    padding: 8px 16px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
}


/* ===== 安装使用 ===== */
.install {
    padding: 100px 0;
    background: var(--bg);
}

.install-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.install-step {
    text-align: center;
    padding: 32px 24px;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    position: relative;
}

.install-step::after {
    content: '→';
    position: absolute;
    right: -18px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 24px;
    color: var(--border);
}

.install-step:last-child::after {
    display: none;
}

.step-number {
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    margin: 0 auto 16px;
}

.step-content h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.step-content p {
    font-size: 14px;
    color: var(--text-secondary);
}

.install-note {
    background: var(--bg-secondary);
    padding: 32px;
    border-radius: var(--radius);
}

.install-note h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
}

.install-note ul {
    list-style: none;
}

.install-note li {
    font-size: 14px;
    color: var(--text-secondary);
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
}

.install-note li:last-child {
    border-bottom: none;
}

.install-note li strong {
    color: var(--text);
}

/* ===== 数据存储 ===== */
.data-storage {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.storage-card {
    display: flex;
    gap: 40px;
    background: white;
    padding: 40px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.storage-icon {
    flex-shrink: 0;
    width: 64px;
    height: 64px;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.storage-icon svg {
    width: 32px;
    height: 32px;
    color: var(--primary);
}

.storage-content h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

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

.storage-content pre {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
}

.storage-content code {
    font-family: 'Monaco', 'Consolas', monospace;
    font-size: 13px;
    color: var(--text);
}

.storage-note {
    margin-top: 16px;
    font-size: 13px;
    color: var(--text-secondary);
}

/* ===== Footer ===== */
.footer {
    padding: 60px 0 30px;
    background: #1e293b;
    color: white;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 30px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
}

.footer-logo {
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

.footer-links {
    display: flex;
    gap: 32px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    padding-top: 30px;
    text-align: center;
}

.footer-bottom p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .feature-large {
        grid-column: span 2;
    }

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

    .install-step::after {
        display: none;
    }
}

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

    .mobile-menu-btn {
        display: flex;
    }

    .hero {
        padding: 120px 0 60px;
    }

    .hero h1 {
        font-size: 32px;
    }

    .hero-desc {
        font-size: 16px;
    }

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

    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }

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

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

    .feature-large {
        grid-column: span 1;
    }

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

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

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

    .storage-card {
        flex-direction: column;
        gap: 24px;
    }

    .footer-content {
        flex-direction: column;
        gap: 24px;
        text-align: center;
    }

    .section-header h2 {
        font-size: 28px;
    }
}

/* ===== 图片占位 ===== */
.screenshot-main,
.screenshot-item img,
.logo-img,
.footer-logo {
    background: linear-gradient(135deg, #e2e8f0 0%, #cbd5e1 100%);
}


/* ===== 滚动动画 ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }

/* ===== 悬浮效果增强 ===== */
.feature-card {
    transform: translateY(0);
}

.feature-card:hover {
    transform: translateY(-8px);
}

.advantage-card {
    transform: translateY(0);
}

.advantage-card:hover {
    transform: translateY(-8px);
    background: white;
}

/* ===== 按钮波纹效果 ===== */
.btn {
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::after {
    width: 300px;
    height: 300px;
}

/* ===== 数字计数动画 ===== */
.stat-value {
    display: inline-block;
}

/* ===== 格式卡片悬浮 ===== */
.format-item {
    transition: all 0.3s ease;
}

.format-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    background: white;
}

/* ===== 安装步骤动画 ===== */
.install-step {
    transition: all 0.3s ease;
}

.install-step:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}

.install-step:hover .step-number {
    transform: scale(1.1);
}

.step-number {
    transition: transform 0.3s ease;
}

/* ===== 技术标签悬浮 ===== */
.tech-item {
    transition: all 0.2s ease;
}

.tech-item:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-2px);
}

/* ===== 时间线动画 ===== */
.roadmap-item {
    transition: all 0.3s ease;
}

.roadmap-content:hover {
    transform: translateX(8px);
}

/* ===== 截图悬浮效果 ===== */
.screenshot-item img {
    transition: all 0.3s ease;
}

.screenshot-item:hover img {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}

/* ===== 存储卡片效果 ===== */
.storage-card {
    transition: all 0.3s ease;
}

.storage-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

/* ===== 代码块样式增强 ===== */
.storage-content pre {
    position: relative;
}

.storage-content pre::before {
    content: '文件结构';
    position: absolute;
    top: -10px;
    left: 16px;
    background: var(--bg-secondary);
    padding: 0 8px;
    font-size: 12px;
    color: var(--text-secondary);
}

/* ===== 导航链接下划线动画 ===== */
.nav-links a:not(.btn) {
    position: relative;
}

.nav-links a:not(.btn)::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width 0.3s ease;
}

.nav-links a:not(.btn):hover::after {
    width: 100%;
}

/* ===== Hero 背景动画 ===== */
.hero {
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.05) 0%, transparent 50%);
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(-5%, 5%) rotate(5deg); }
    50% { transform: translate(5%, -5%) rotate(-5deg); }
    75% { transform: translate(-3%, -3%) rotate(3deg); }
}

/* ===== 加载状态 ===== */
.loading {
    position: relative;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    animation: shimmer 1.5s infinite;
}

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

/* ===== 回到顶部按钮 ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
    z-index: 99;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-4px);
}

.back-to-top svg {
    width: 24px;
    height: 24px;
}

/* ===== 选择高亮 ===== */
::selection {
    background: rgba(59, 130, 246, 0.2);
    color: var(--text);
}

/* ===== 滚动条美化 ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

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

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


/* ===== 文件格式分类样式 ===== */
.formats-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.format-category {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 24px;
    transition: all 0.3s ease;
}

.format-category:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}

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

.category-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.category-icon svg {
    width: 20px;
    height: 20px;
}

.icon-pink {
    background: rgba(236, 72, 153, 0.1);
    color: #ec4899;
}

.category-header h3 {
    font-size: 16px;
    font-weight: 600;
    margin: 0;
}

.format-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.format-tags span {
    padding: 4px 10px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.format-tags span:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* ===== 使用说明卡片样式 ===== */
.usage-guide {
    margin-top: 60px;
    padding-top: 60px;
    border-top: 1px solid var(--border);
}

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

.usage-card {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
    transition: all 0.3s ease;
}

.usage-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    background: white;
}

.usage-icon {
    width: 48px;
    height: 48px;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}

.usage-icon svg {
    width: 24px;
    height: 24px;
    color: var(--primary);
}

.usage-card h4 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 8px;
}

.usage-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ===== 数据存储可视化样式 ===== */
.storage-visual {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}

.storage-diagram {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 32px;
}

.folder-tree {
    font-family: 'Monaco', 'Consolas', monospace;
    font-size: 14px;
}

.tree-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
}

.tree-item:last-child {
    border-bottom: none;
}

.tree-item.root {
    font-weight: 600;
}

.tree-item.sub {
    padding-left: 24px;
}

.folder-icon {
    font-size: 16px;
}

.folder-name {
    color: var(--text);
}

.folder-name.highlight {
    color: var(--primary);
    font-weight: 600;
}

.folder-desc {
    font-size: 12px;
    color: var(--text-secondary);
    margin-left: auto;
}

.storage-info {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.info-card {
    display: flex;
    gap: 16px;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    transition: all 0.3s ease;
}

.info-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

.info-icon {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.info-icon svg {
    width: 22px;
    height: 22px;
}

.info-content h4 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 4px;
}

.info-content p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ===== 响应式调整 ===== */
@media (max-width: 1024px) {
    .usage-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .storage-visual {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .usage-grid {
        grid-template-columns: 1fr;
    }
    
    .formats-categories {
        grid-template-columns: 1fr;
    }
}


/* ===== 文件格式新样式 ===== */
.formats-main {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 32px;
    margin-bottom: 24px;
}

.formats-main-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.main-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.main-icon svg {
    width: 24px;
    height: 24px;
}

.formats-main-header h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 4px;
}

.formats-main-header p {
    font-size: 14px;
    color: var(--text-secondary);
}

.formats-grid-main {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.formats-grid-main .format-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 16px 24px;
    background: white;
    border-radius: var(--radius-sm);
    min-width: 90px;
    transition: all 0.2s;
}

.formats-grid-main .format-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.formats-grid-main .format-ext {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.formats-grid-main .format-name {
    font-size: 12px;
    color: var(--text-secondary);
}

/* 其他格式样式 */
.formats-other {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 24px;
}

.formats-other-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.formats-other-header svg {
    width: 20px;
    height: 20px;
    color: var(--text-secondary);
}

.formats-other-header > span:first-of-type {
    font-weight: 600;
    color: var(--text);
}

.formats-other-note {
    font-size: 13px;
    color: var(--text-secondary);
    margin-left: auto;
    background: rgba(59, 130, 246, 0.1);
    padding: 4px 12px;
    border-radius: 20px;
}

.formats-other-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.other-category {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: white;
    border-radius: var(--radius-sm);
}

.category-label {
    font-size: 12px;
    font-weight: 600;
    color: white;
    background: var(--text-secondary);
    padding: 4px 10px;
    border-radius: 4px;
    min-width: 48px;
    text-align: center;
}

.category-formats {
    font-size: 13px;
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .formats-other-list {
        grid-template-columns: 1fr;
    }
    
    .formats-other-note {
        display: none;
    }
    
    .formats-grid-main {
        justify-content: center;
    }
}


/* ===== 全宽截图展示样式 ===== */
.screenshots-full {
    padding: 100px 0 0;
    background: var(--bg-secondary);
}

.screenshot-showcase {
    margin-top: 60px;
}

.screenshot-full-item {
    position: relative;
    padding: 60px 0;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, #f1f5f9 100%);
}

.screenshot-full-item.dark {
    background: linear-gradient(180deg, #1e293b 0%, #0f172a 100%);
}

.screenshot-label {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: white;
    border-radius: 30px;
    box-shadow: var(--shadow);
    font-weight: 600;
    font-size: 14px;
    z-index: 10;
}

.screenshot-full-item.dark .screenshot-label {
    background: #334155;
    color: white;
}

.label-icon {
    font-size: 16px;
}

.screenshot-full-wrapper {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
}

.screenshot-full-wrapper img {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    display: block;
}

.screenshot-full-item.dark .screenshot-full-wrapper img {
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

/* 移动端截图可选展示 */
@media (max-width: 768px) {
    .screenshot-full-item {
        padding: 50px 0;
    }
    
    .screenshot-full-wrapper {
        padding: 0 16px;
    }
    
    .screenshot-label {
        padding: 6px 16px;
        font-size: 13px;
    }
}


/* ===== 界面预览选项卡样式 ===== */
.screenshots-section {
    padding: 100px 0;
    background: var(--bg-secondary);
}

/* 桌面端预览 */
.desktop-preview {
    margin-bottom: 80px;
}

.preview-tabs {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 32px;
    position: relative;
}

.preview-tab {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: white;
    border: 2px solid var(--border);
    border-radius: 30px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    z-index: 1;
}

.preview-tab:hover {
    border-color: var(--primary);
}

.preview-tab.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.tab-icon {
    font-size: 18px;
}

.auto-play-hint {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: 16px;
    font-size: 13px;
    color: var(--text-secondary);
}

.auto-play-hint .dot {
    width: 8px;
    height: 8px;
    background: #22c55e;
    border-radius: 50%;
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.8); }
}

.preview-content {
    position: relative;
    background: white;
    border-radius: 16px;
    padding: 24px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.preview-panel {
    display: none;
    animation: fadeIn 0.5s ease;
}

.preview-panel.active {
    display: block;
}

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

.preview-panel img {
    width: 100%;
    border-radius: 8px;
    display: block;
}

/* 移动端预览 */
.mobile-preview {
    text-align: center;
}

.mobile-preview-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 12px;
}

.title-icon {
    font-size: 28px;
}

.mobile-preview-desc {
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.mobile-screens {
    display: flex;
    justify-content: center;
    gap: 32px;
}

.mobile-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.phone-frame {
    width: 220px;
    height: 440px;
    background: #1a1a1a;
    border-radius: 32px;
    padding: 12px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
}

.phone-frame::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 24px;
    background: #000;
    border-radius: 12px;
    z-index: 10;
}

.phone-frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 20px;
}

.screen-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

/* 响应式 */
@media (max-width: 768px) {
    .mobile-screens {
        flex-direction: column;
        align-items: center;
        gap: 40px;
    }
    
    .phone-frame {
        width: 200px;
        height: 400px;
    }
    
    .preview-tabs {
        flex-wrap: wrap;
    }
    
    .auto-play-hint {
        width: 100%;
        justify-content: center;
        margin-left: 0;
        margin-top: 12px;
    }
}