/* ===================================
   无界官网 - 核心样式
   清新明亮科技感主题，全端自适应
   =================================== */

/* ========== CSS Variables ========== */
:root {
    /* 主色调 - 明亮清新 */
    --color-bg: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-surface: #ffffff;
    --color-surface-hover: #f1f5f9;
    
    /* 强调色 - 充满活力的渐变 */
    --color-primary: #0ea5e9;
    --color-primary-light: #38bdf8;
    --color-primary-dark: #0284c7;
    --color-secondary: #8b5cf6;
    --color-accent: #f59e0b;
    
    /* 渐变 - 清新明亮 */
    --gradient-primary: linear-gradient(135deg, #0ea5e9 0%, #8b5cf6 100%);
    --gradient-hero: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 50%, #8b5cf6 100%);
    --gradient-card: linear-gradient(180deg, rgba(14,165,233,0.05) 0%, rgba(139,92,246,0.05) 100%);
    
    /* 文字 - 柔和清晰 */
    --color-text: #0f172a;
    --color-text-secondary: #475569;
    --color-text-muted: #94a3b8;
    
    /* 字体 */
    --font-display: 'Inter', 'Orbitron', sans-serif;
    --font-body: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* 间距 */
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 48px;
    --space-xl: 80px;
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 50px;
    
    /* 阴影 - 柔和清晰 */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.1);
    --shadow-glow: 0 0 30px rgba(14,165,233,0.2);
    
    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ========== Reset & Base ========== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
}

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

button {
    font-family: inherit;
    cursor: pointer;
}

ul, ol {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* ========== 粒子背景 ========== */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 0.6;
}

/* ========== 导航栏 ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-sm) 0;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    transition: var(--transition-normal);
}

.navbar.scrolled {
    padding: var(--space-xs) 0;
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-sm);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.logo-icon {
    color: var(--color-primary);
    font-size: 1.8rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-lg);
}

.nav-link {
    position: relative;
    padding: var(--space-xs) 0;
    color: var(--color-text-secondary);
    transition: var(--transition-fast);
    font-weight: 500;
    font-size: 0.95rem;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: 1px;
    transition: var(--transition-normal);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs);
    z-index: 1001;
}

.mobile-menu-btn span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 1px;
    transition: var(--transition-fast);
}

.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);
}

/* ========== Hero区域 ========== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: calc(80px + var(--space-xl)) 0 16px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, 
        rgba(14,165,233,0.08) 0%, 
        rgba(139,92,246,0.05) 50%,
        transparent 100%);
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(14,165,233,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(14,165,233,0.04) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove 25s linear infinite;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

.hero-glow {
    position: absolute;
    top: 20%;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(14,165,233,0.15) 0%, rgba(139,92,246,0.08) 40%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: var(--space-xl) 0;
    max-width: 800px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 6px 16px;
    background: rgba(14,165,233,0.08);
    border: 1px solid rgba(14,165,233,0.2);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 1.5px;
    color: var(--color-primary);
    margin-bottom: var(--space-lg);
}

.badge-dot {
    width: 6px;
    height: 6px;
    background: var(--color-primary);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.3); }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space-md);
    letter-spacing: -0.03em;
    color: var(--color-text);
}

.title-line {
    display: block;
}

.title-gradient {
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--space-lg);
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: 14px 28px;
    border-radius: var(--radius-full);
    font-weight: 600;
    transition: var(--transition-normal);
    cursor: pointer;
    border: none;
    font-size: 0.95rem;
    letter-spacing: 0.01em;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 4px 20px rgba(14,165,233,0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(14,165,233,0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text);
    border: 1.5px solid rgba(0,0,0,0.12);
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: rgba(14,165,233,0.04);
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--color-text-muted);
    font-size: 0.7rem;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.scroll-indicator {
    width: 24px;
    height: 38px;
    border: 2px solid rgba(0,0,0,0.15);
    border-radius: 12px;
    position: relative;
}

.scroll-indicator::after {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 10px;
    background: var(--color-primary);
    border-radius: 2px;
    animation: scrollDown 2s ease-in-out infinite;
}

@keyframes scrollDown {
    0% { opacity: 1; top: 8px; }
    100% { opacity: 0; top: 20px; }
}

/* ========== 通用 Section ========== */
section {
    position: relative;
    z-index: 1;
    padding: var(--space-lg) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.section-tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 800;
    margin-bottom: var(--space-sm);
    letter-spacing: -0.02em;
    color: var(--color-text);
}

.section-desc {
    color: var(--color-text-secondary);
    font-size: 1.05rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ========== 产品展示 ========== */
.products {
    background: var(--color-bg-secondary);
    padding-top: 24px;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.product-card {
    position: relative;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition-normal);
    cursor: pointer;
    border: 1px solid rgba(0,0,0,0.06);
    text-decoration: none;
    color: inherit;
    display: block;
}

.product-card:hover {
    transform: translateY(-6px);
    border-color: rgba(14,165,233,0.2);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.card-glow {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), 
        rgba(14,165,233,0.08) 0%, 
        transparent 60%);
    opacity: 0;
    transition: var(--transition-normal);
}

.product-card:hover .card-glow {
    opacity: 1;
}

.card-icon {
    padding: var(--space-md) var(--space-md) 0;
    color: var(--color-primary);
    width: fit-content;
}

.card-icon svg {
    width: 48px;
    height: 48px;
    display: block;
    margin: 0 auto;
}

.card-content {
    padding: var(--space-md);
}

.card-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: var(--space-xs);
    color: var(--color-text);
}

.card-desc {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
    line-height: 1.7;
    font-size: 0.9rem;
}

.card-features {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: var(--space-md);
}

.feature-tag {
    padding: 4px 10px;
    background: rgba(14,165,233,0.08);
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--color-primary);
    letter-spacing: 0.02em;
}

.card-arrow {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--color-text-muted);
    font-size: 0.85rem;
    font-weight: 600;
    transition: var(--transition-fast);
}

.product-card:hover .card-arrow {
    color: var(--color-primary);
}

.product-card-placeholder {
    opacity: 0.7;
    border-style: dashed;
}

.product-card-placeholder:hover {
    opacity: 0.9;
}

/* ========== 关于区域 ========== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

.about-text {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
    line-height: 1.8;
    font-size: 1rem;
}

.about-stats {
    display: flex;
    gap: var(--space-lg);
    margin-top: var(--space-lg);
}

.stat-item {
    text-align: left;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

.about-visual {
    position: relative;
    height: 360px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.visual-ring {
    position: absolute;
    border: 2px solid rgba(14,165,233,0.15);
    border-radius: 50%;
    animation: rotate 18s linear infinite;
}

.visual-ring:nth-child(1) {
    width: 280px;
    height: 280px;
}

.visual-ring:nth-child(2) {
    width: 220px;
    height: 220px;
    animation-direction: reverse;
    animation-duration: 14s;
    border-color: rgba(139,92,246,0.2);
}

.visual-ring:nth-child(3) {
    width: 160px;
    height: 160px;
    animation-duration: 10s;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.visual-center {
    z-index: 1;
}

.visual-center .logo-icon.large {
    font-size: 3.5rem;
    animation: glow 3s ease-in-out infinite;
}

@keyframes glow {
    0%, 100% { filter: drop-shadow(0 0 15px rgba(14,165,233,0.4)); }
    50% { filter: drop-shadow(0 0 30px rgba(14,165,233,0.6)) drop-shadow(0 0 45px rgba(139,92,246,0.3)); }
}

/* ========== 联系区域 ========== */
.contact {
    background: var(--color-bg-secondary);
}

.contact-content {
    max-width: 560px;
    margin: 0 auto;
    text-align: center;
}

.contact-text {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    font-size: 1rem;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 12px 20px;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid rgba(0,0,0,0.06);
    transition: var(--transition-normal);
    font-weight: 500;
}

.contact-link:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.contact-link svg {
    color: var(--color-primary);
    flex-shrink: 0;
}

/* ========== Footer ========== */
.footer {
    padding: var(--space-xl) 0 var(--space-md);
    border-top: 1px solid rgba(0,0,0,0.06);
    background: var(--color-bg);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.footer-desc {
    color: var(--color-text-muted);
    margin-top: var(--space-sm);
    font-size: 0.9rem;
    line-height: 1.7;
}

.footer-links h4 {
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: var(--space-md);
    color: var(--color-text);
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.footer-links a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--space-md);
    border-top: 1px solid rgba(0,0,0,0.06);
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

/* ========== 产品详情页 ========== */
.product-hero {
    min-height: 60vh;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.feature-card {
    background: var(--color-surface);
    border: 1px solid rgba(0,0,0,0.06);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: rgba(14,165,233,0.2);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    font-size: 2.2rem;
    margin-bottom: var(--space-md);
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: var(--space-xs);
    color: var(--color-text);
}

.feature-card p {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
}

/* 下载区域 */
.download {
    background: var(--gradient-hero);
    color: #fff;
}

.download-content {
    text-align: center;
}

.download .section-tag {
    color: rgba(255,255,255,0.8);
}

.download .section-title {
    color: #fff;
}

.download-desc {
    color: rgba(255,255,255,0.85);
    margin-bottom: var(--space-lg);
    font-size: 1.05rem;
}

.download-links {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 14px 24px;
    background: rgba(255,255,255,0.15);
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: var(--radius-md);
    font-weight: 600;
    color: #fff;
    transition: var(--transition-normal);
    backdrop-filter: blur(10px);
}

.download-btn:hover {
    background: rgba(255,255,255,0.25);
    transform: translateY(-2px);
}

.download-btn svg {
    color: #fff;
}

/* 分类区域 */
.categories {
    background: var(--color-bg);
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
}

.category-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-lg) var(--space-md);
    background: var(--color-surface);
    border: 1px solid rgba(0,0,0,0.06);
    border-radius: var(--radius-lg);
    transition: var(--transition-normal);
    text-decoration: none;
    color: inherit;
}

.category-card:hover {
    border-color: rgba(14,165,233,0.2);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.category-icon {
    font-size: 2rem;
}

.category-name {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-text);
}

/* ========== 返回顶部按钮 ========== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.2rem;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition-normal);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

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

/* ========== 动画类 ========== */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* ========== 响应式 - 平板 ========== */
@media (max-width: 1024px) {
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .category-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1.5fr 1fr 1fr;
    }
}

/* ========== 响应式 - 小平板/大屏手机 ========== */
@media (max-width: 768px) {
    :root {
        --space-xl: 60px;
        --space-lg: 36px;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: var(--space-lg);
        transform: translateX(100%);
        transition: var(--transition-normal);
        z-index: 999;
    }
    
    .nav-menu.active {
        transform: translateX(0);
    }
    
    .nav-link {
        font-size: 1.2rem;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero {
        padding-top: 100px;
    }
    
    .hero-title {
        font-size: clamp(2rem, 8vw, 3rem);
    }
    
    .product-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .about-stats {
        justify-content: center;
    }
    
    .stat-item {
        text-align: center;
    }
    
    .about-visual {
        height: 280px;
        order: -1;
    }
    
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        text-align: center;
    }
    
    .footer-brand {
        grid-column: 1 / -1;
    }
    
    .footer-links ul {
        align-items: center;
    }
    
    .download-links {
        flex-direction: column;
        align-items: center;
    }
    
    .download-btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
}

/* ========== 响应式 - 手机 ========== */
@media (max-width: 480px) {
    :root {
        --space-xl: 48px;
        --space-lg: 28px;
        --space-md: 18px;
    }
    
    .container {
        padding: 0 var(--space-sm);
    }
    
    .hero-cta {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .contact-links {
        flex-direction: column;
    }
    
    .contact-link {
        justify-content: center;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-links ul {
        align-items: center;
    }
    
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-sm);
    }
    
    .category-card {
        padding: var(--space-md) var(--space-sm);
    }
    
    .hero-scroll {
        display: none;
    }
    
    .hero-badge {
        font-size: 0.65rem;
        padding: 5px 12px;
    }
}

/* ========== 横屏手机优化 ========== */
@media (max-width: 768px) and (orientation: landscape) {
    .hero {
        min-height: auto;
        padding: 100px 0 60px;
    }
    
    .hero-title {
        font-size: 2.2rem;
    }
    
    .about-visual {
        height: 200px;
    }
}

/* ========== 高对比度/深色模式支持 ========== */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #0f172a;
        --color-bg-secondary: #1e293b;
        --color-surface: #1e293b;
        --color-surface-hover: #334155;
        --color-text: #f8fafc;
        --color-text-secondary: #cbd5e1;
        --color-text-muted: #64748b;
    }
    
    .navbar {
        background: rgba(15, 23, 42, 0.85);
        border-bottom-color: rgba(255,255,255,0.06);
    }
    
    .navbar.scrolled {
        background: rgba(15, 23, 42, 0.95);
    }
    
    .btn-secondary {
        border-color: rgba(255,255,255,0.15);
    }
    
    .btn-secondary:hover {
        border-color: var(--color-primary);
        background: rgba(14,165,233,0.08);
    }
    
    .contact-link {
        background: var(--color-surface);
        border-color: rgba(255,255,255,0.06);
    }
    
    .download {
        background: linear-gradient(135deg, #0ea5e9 0%, #7c3aed 100%);
    }
    
    .footer {
        border-top-color: rgba(255,255,255,0.06);
    }
    
    .footer-bottom {
        border-top-color: rgba(255,255,255,0.06);
    }
}

/* ========== 打印样式 ========== */
@media print {
    .navbar, .particles, .hero-scroll {
        display: none;
    }
    
    body {
        background: #fff;
        color: #000;
    }
    
    section {
        padding: 20px 0;
    }
}

/* ========== 减少动画偏好 ========== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}