/**
 * 讯淘IM聊天系统 - 首页样式
 * @author 极客通讯
 * @contact douyin 遥望侣途
 */

/* ===== CSS 变量 / Design Tokens ===== */
:root {
    --primary: #7c6aff;
    --primary-dark: #6a5acd;
    --primary-light: #a78bfa;
    --primary-glow: rgba(124, 106, 255, 0.35);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #7c6aff 100%);
    --gradient-card: linear-gradient(135deg, #667eea 0%, #7c6aff 100%);

    --text-primary: #1a1a2e;
    --text-secondary: #555770;
    --text-light: #8b8da3;

    --bg-white: #ffffff;
    --bg-light: #f7f8fc;
    --bg-section: #fafaff;
    --border: #e8e8ef;
    --border-light: #f0f0f5;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 24px 64px rgba(0, 0, 0, 0.12);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== 全局重置 ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
        'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    color: var(--text-primary);
    line-height: 1.6;
    background: var(--bg-white);
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

img {
    max-width: 100%;
    display: block;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid transparent;
    transition: all var(--transition-normal);
}

.navbar.navbar-scrolled {
    background: rgba(255, 255, 255, 0.95);
    border-bottom-color: var(--border-light);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 14px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-left .logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}

.nav-left .logo img {
    height: 32px;
    width: 32px;
}

.nav-center {
    display: flex;
    gap: 36px;
}

.nav-link {
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    position: relative;
    padding: 4px 0;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary);
    border-radius: 1px;
    transition: all var(--transition-normal);
    transform: translateX(-50%);
}

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

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

.nav-right {
    display: flex;
    gap: 12px;
    align-items: center;
}

.nav-btn-outline {
    padding: 8px 22px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.nav-btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(124, 106, 255, 0.04);
}

.nav-btn-primary {
    padding: 8px 22px;
    background: var(--primary);
    border: none;
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 600;
    color: white;
    transition: all var(--transition-fast);
}

.nav-btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px var(--primary-glow);
}

/* ===== 移动端菜单按钮 ===== */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    gap: 5px;
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

.mobile-menu-toggle:hover {
    background: var(--bg-light);
}

.mobile-menu-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 1px;
    transition: all var(--transition-fast);
}

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

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

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

/* ===== 移动端侧边菜单 ===== */
.mobile-menu-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 1001;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    opacity: 0;
    transition: opacity var(--transition-normal);
    pointer-events: none;
}

.mobile-menu-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 0;
    right: -300px;
    z-index: 1002;
    width: 280px;
    height: 100vh;
    background: var(--bg-white);
    padding: 24px;
    box-shadow: var(--shadow-xl);
    transition: right var(--transition-normal);
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu a {
    display: block;
    padding: 14px 16px;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.mobile-menu a:hover,
.mobile-menu a.active {
    color: var(--primary);
    background: rgba(124, 106, 255, 0.06);
}

.mobile-menu .mobile-actions {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.mobile-menu .mobile-actions a {
    text-align: center;
    padding: 12px;
    border-radius: var(--radius-full);
    font-weight: 600;
}

.mobile-menu .mobile-actions .nav-btn-primary {
    color: white;
    background: var(--primary);
}

.mobile-menu .mobile-actions .nav-btn-outline {
    border: 1.5px solid var(--border);
}

/* ===== Hero 区域 ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 70px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-hero);
    z-index: 0;
}

#particle-canvas {
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: auto;
}

/* Hero 底部波浪 */
.hero::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 100px;
    background: var(--bg-white);
    clip-path: ellipse(55% 100% at 50% 100%);
    z-index: 2;
}

.hero-container {
    position: relative;
    z-index: 3;
    text-align: center;
    padding: 80px 24px 120px;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 68px;
    font-weight: 800;
    line-height: 1.15;
    color: white;
    margin-bottom: 20px;
    letter-spacing: -1px;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.hero-subtitle {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 44px;
    letter-spacing: 3px;
    font-weight: 400;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 64px;
    flex-wrap: wrap;
}

.btn-hero-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 36px;
    background: white;
    color: var(--primary);
    border: none;
    border-radius: var(--radius-full);
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15);
}

.btn-hero-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.btn-hero-primary img {
    width: 20px;
    height: 20px;
}

.btn-hero-secondary {
    display: inline-flex;
    align-items: center;
    padding: 16px 36px;
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border: 1.5px solid rgba(255, 255, 255, 0.35);
    border-radius: var(--radius-full);
    font-size: 16px;
    font-weight: 600;
    backdrop-filter: blur(12px);
    transition: all var(--transition-normal);
}

.btn-hero-secondary:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

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

.hero-stat {
    text-align: center;
    color: white;
}

.stat-value {
    display: block;
    font-size: 40px;
    font-weight: 800;
    margin-bottom: 4px;
    letter-spacing: -0.5px;
}

.stat-text {
    font-size: 14px;
    opacity: 0.75;
    font-weight: 500;
    letter-spacing: 1px;
}

.hero-stat-divider {
    width: 1px;
    height: 50px;
    background: rgba(255, 255, 255, 0.25);
    align-self: center;
}

/* Hero 入场动画辅助类（JS 临时添加） */
.hero-animate-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease !important;
}

/* ===== 平台下载区域 ===== */
.platforms {
    padding: 100px 24px 120px;
    background: var(--bg-white);
    position: relative;
    z-index: 1;
}

.platforms-container {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.section-title {
    font-size: 44px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.section-subtitle {
    font-size: 17px;
    color: var(--text-secondary);
    margin-bottom: 64px;
    font-weight: 400;
}

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

.platform-card {
    position: relative;
    padding: 44px 28px 36px;
    border-radius: var(--radius-lg);
    background: var(--bg-light);
    border: 1px solid var(--border-light);
    transition: all var(--transition-normal);
    overflow: hidden;
    cursor: default;
}

/* 卡片悬停光效 */
.platform-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(
        300px circle at var(--glow-x, 50%) var(--glow-y, 50%),
        rgba(124, 106, 255, 0.06),
        transparent 60%
    );
    opacity: 0;
    transition: opacity var(--transition-normal);
    pointer-events: none;
}

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

.platform-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(124, 106, 255, 0.15);
}

.platform-card-web {
    background: var(--gradient-card);
    border: none;
}

.platform-card-web::before {
    display: none;
}

.platform-card-web:hover {
    transform: translateY(-8px);
    box-shadow: 0 16px 48px var(--primary-glow);
}

.platform-card-web:hover h3,
.platform-card-web:hover .platform-desc {
    color: white;
}

.platform-card-web:hover .platform-icon img {
    filter: brightness(0) invert(1);
}

.platform-card-web:hover .btn-platform {
    background: white;
    color: var(--primary);
}

.platform-icon {
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 56px;
}

.platform-icon img {
    height: 56px;
    width: 56px;
    transition: transform var(--transition-normal), filter var(--transition-normal);
}

.platform-card:hover .platform-icon img {
    transform: scale(1.08);
}

.platform-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    transition: color var(--transition-normal);
}

.platform-desc {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 24px;
    transition: color var(--transition-normal);
}

.btn-platform {
    display: block;
    width: 100%;
    padding: 12px 24px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
}

.btn-platform:hover {
    background: var(--primary-dark);
    box-shadow: 0 4px 16px var(--primary-glow);
}

.btn-platform-primary {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1.5px solid rgba(255, 255, 255, 0.4);
}

.platform-card-web:hover .btn-platform-primary:hover {
    background: white;
    color: var(--primary);
    border-color: white;
}

/* ===== 核心功能区 ===== */
.features {
    padding: 100px 24px 120px;
    background: var(--bg-section);
}

.features-container {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

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

.feature-item {
    padding: 40px 32px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    text-align: left;
    border: 1px solid var(--border-light);
    transition: all var(--transition-normal);
}

.feature-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(124, 106, 255, 0.12);
}

.feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    margin-bottom: 24px;
    border-radius: var(--radius-md);
    background: var(--gradient-card);
    transition: transform var(--transition-normal);
}

.feature-item:hover .feature-icon {
    transform: scale(1.08) rotate(-3deg);
}

.feature-icon img {
    width: 40px;
    height: 40px;
}

.feature-item h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.feature-item p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== 优势区域 ===== */
.advantages {
    padding: 100px 24px 120px;
    background: var(--bg-white);
}

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

.advantages-title {
    text-align: center;
    font-size: 44px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 64px;
    letter-spacing: -0.5px;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.advantage-item {
    text-align: center;
    padding: 32px 20px;
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
}

.advantage-item:hover {
    background: var(--bg-section);
}

.advantage-icon-wrapper {
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-card);
    border-radius: 20px;
    transition: transform var(--transition-normal);
    box-shadow: 0 8px 24px var(--primary-glow);
}

.advantage-item:hover .advantage-icon-wrapper {
    transform: scale(1.1) rotate(-5deg);
}

.advantage-icon-wrapper img {
    width: 48px;
    height: 48px;
}

.advantage-item h3 {
    font-size: 19px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.advantage-item p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== 下载提示模态框 ===== */
.download-modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(6px);
    opacity: 0;
    transition: opacity var(--transition-normal);
    pointer-events: none;
    align-items: center;
    justify-content: center;
}

.download-modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.download-modal {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    z-index: 2001;
    width: 420px;
    max-width: 90vw;
    background: var(--bg-white);
    border-radius: var(--radius-xl);
    padding: 40px 36px 32px;
    box-shadow: var(--shadow-xl);
    transform: translate(-50%, -50%) scale(0.9);
    opacity: 0;
    transition: all var(--transition-normal);
    text-align: center;
}

.download-modal.active {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
}

.download-modal .modal-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    background: var(--gradient-card);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.download-modal .modal-icon img {
    width: 32px;
    height: 32px;
    filter: brightness(0) invert(1);
}

.download-modal h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.download-modal p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 28px;
}

.download-modal .modal-actions {
    display: flex;
    gap: 12px;
}

.download-modal .btn-modal-primary {
    flex: 1;
    padding: 12px 20px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
    display: block;
}

.download-modal .btn-modal-primary:hover {
    background: var(--primary-dark);
}

.download-modal .btn-modal-secondary {
    flex: 1;
    padding: 12px 20px;
    background: var(--bg-light);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
    display: block;
}

.download-modal .btn-modal-secondary:hover {
    background: var(--border-light);
}

/* ===== 页脚 ===== */
.footer {
    padding: 64px 24px 28px;
    background: #16162a;
    color: white;
}

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

.footer-content {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 64px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand {
    padding-top: 4px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
    font-weight: 700;
    color: white;
    margin-bottom: 12px;
}

.footer-logo img {
    height: 28px;
    width: 28px;
}

.footer-tagline {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
    line-height: 1.6;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.footer-column h4 {
    font-size: 15px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 18px;
    letter-spacing: 0.5px;
}

.footer-column a,
.footer-column p {
    display: block;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.45);
    margin-bottom: 10px;
    line-height: 1.7;
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: rgba(255, 255, 255, 0.85);
}

.footer-bottom {
    padding-top: 24px;
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.3);
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.35);
    transition: color var(--transition-fast);
}

.footer-bottom a:hover {
    color: rgba(255, 255, 255, 0.7);
}

/* ===== 滚动渐入动画（JS增强，默认可见） ===== */
/* JS 会为 [data-reveal] 添加 .reveal-ready 类来启动动画 */
/* 无 JS 时内容始终可见 */
[data-reveal] {
    opacity: 1;
    transform: none;
    transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
        transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-reveal].reveal-ready {
    opacity: 0;
    transform: translateY(32px);
}

[data-reveal].revealed {
    opacity: 1;
    transform: translateY(0);
}

/* 子元素交错延迟（JS增强） */
[data-reveal-children] > * {
    opacity: 1;
    transform: none;
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
        transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-reveal-children].reveal-ready > * {
    opacity: 0;
    transform: translateY(24px);
}

[data-reveal-children].revealed > *:nth-child(1) { transition-delay: 0s; opacity: 1; transform: translateY(0); }
[data-reveal-children].revealed > *:nth-child(2) { transition-delay: 0.08s; opacity: 1; transform: translateY(0); }
[data-reveal-children].revealed > *:nth-child(3) { transition-delay: 0.16s; opacity: 1; transform: translateY(0); }
[data-reveal-children].revealed > *:nth-child(4) { transition-delay: 0.24s; opacity: 1; transform: translateY(0); }
[data-reveal-children].revealed > *:nth-child(5) { transition-delay: 0.32s; opacity: 1; transform: translateY(0); }
[data-reveal-children].revealed > *:nth-child(6) { transition-delay: 0.40s; opacity: 1; transform: translateY(0); }

/* 无 JS 时确保一切可见 */
noscript + * [data-reveal],
noscript + * [data-reveal-children] > * {
    opacity: 1 !important;
    transform: none !important;
}

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

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

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

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

    .mobile-menu-toggle,
    .mobile-menu-overlay,
    .mobile-menu {
        display: block;
    }

    .hero-title {
        font-size: 44px;
    }

    .hero-subtitle {
        font-size: 16px;
        letter-spacing: 2px;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
        gap: 14px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }

    .hero-stat-divider {
        display: none;
    }

    .stat-value {
        font-size: 32px;
    }

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

    .platforms-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .advantages-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 36px;
    }

    .footer-links {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .platforms,
    .features,
    .advantages {
        padding: 80px 20px 100px;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 12px 16px;
    }

    .hero-container {
        padding: 60px 16px 100px;
    }

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

    .hero-subtitle {
        font-size: 14px;
    }

    .btn-hero-primary,
    .btn-hero-secondary {
        padding: 14px 28px;
        font-size: 15px;
        width: 100%;
        justify-content: center;
    }

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

    .feature-item,
    .platform-card {
        padding: 28px 20px;
    }

    .advantages-grid {
        gap: 8px;
    }

    .advantage-item {
        padding: 20px 16px;
    }

    .download-modal {
        padding: 32px 24px 24px;
    }
}

/* ===== 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;
    }

    [data-reveal],
    [data-reveal-children] > * {
        opacity: 1 !important;
        transform: none !important;
    }
}