/* ===== 全局变量与重置 ===== */
:root {
    --color-bg: #0A1628;
    --color-bg-2: #0F1F3A;
    --color-bg-3: #142B4C;
    --color-primary: #0D7377;
    --color-primary-2: #14B8A6;
    --color-secondary: #0EA5E9;
    --color-secondary-2: #0369A1;
    --color-accent: #22D3EE;
    --color-text: #FFFFFF;
    --color-text-muted: #8BB4D4;
    --color-text-dim: #5E8BAE;
    --color-card: rgba(255, 255, 255, 0.04);
    --color-card-hover: rgba(255, 255, 255, 0.08);
    --color-border: rgba(20, 184, 166, 0.18);
    --gradient-primary: linear-gradient(135deg, #0D7377 0%, #0EA5E9 100%);
    --gradient-primary-2: linear-gradient(135deg, #14B8A6 0%, #22D3EE 100%);
    --gradient-bg: linear-gradient(135deg, #0A1628 0%, #0F1F3A 50%, #142B4C 100%);
    --gradient-text: linear-gradient(90deg, #14B8A6, #22D3EE, #0EA5E9);
    --shadow-glow: 0 10px 40px rgba(20, 184, 166, 0.35);
    --shadow-card: 0 20px 60px rgba(0, 0, 0, 0.4);
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

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

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 100px 0;
    position: relative;
}

/* ===== 顶部导航 ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: var(--transition);
    padding: 20px 0;
}

.header.scrolled {
    padding: 12px 0;
    background: rgba(10, 22, 40, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 20px;
}

.logo-img {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    object-fit: cover;
    background: var(--gradient-primary);
}

.logo-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: 0.5px;
}

.nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    font-size: 15px;
    color: var(--color-text-muted);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--color-text);
    background: var(--color-card);
}

.nav-link.current {
    color: var(--color-primary-2);
}

.nav-cta {
    background: var(--gradient-primary);
    color: #fff;
    font-weight: 600;
    box-shadow: 0 4px 20px rgba(20, 184, 166, 0.4);
}

.nav-cta:hover {
    background: var(--gradient-primary-2);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 28px rgba(20, 184, 166, 0.55);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: var(--transition);
}

.menu-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

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

.menu-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

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

.hero-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-bg);
    z-index: -2;
}

.hero-bg::before,
.hero-bg::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.5;
}

.hero-bg::before {
    width: 500px;
    height: 500px;
    background: var(--color-primary);
    top: -100px;
    left: -100px;
    animation: floatBlob 12s ease-in-out infinite;
}

.hero-bg::after {
    width: 600px;
    height: 600px;
    background: var(--color-secondary);
    bottom: -200px;
    right: -150px;
    animation: floatBlob 14s ease-in-out infinite reverse;
}

@keyframes floatBlob {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(50px, 30px) 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 1s ease;
}

.hero-badge {
    display: inline-block;
    padding: 8px 18px;
    background: rgba(20, 184, 166, 0.12);
    border: 1px solid var(--color-border);
    border-radius: 50px;
    font-size: 13px;
    color: var(--color-primary-2);
    margin-bottom: 24px;
    letter-spacing: 1px;
}

.hero-title {
    font-size: clamp(38px, 5.5vw, 64px);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    background-size: 200% auto;
    animation: shimmer 4s linear infinite;
}

@keyframes shimmer {
    0% { background-position: 0% center; }
    100% { background-position: 200% center; }
}

.hero-desc {
    font-size: 17px;
    color: var(--color-text-muted);
    margin-bottom: 32px;
    max-width: 520px;
    line-height: 1.8;
}

.hero-meta {
    display: flex;
    align-items: center;
    gap: 24px;
    margin-bottom: 36px;
    padding: 18px 24px;
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    backdrop-filter: blur(10px);
    width: fit-content;
}

.meta-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.meta-label {
    font-size: 12px;
    color: var(--color-text-dim);
    letter-spacing: 0.5px;
}

.meta-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text);
}

.meta-divider {
    width: 1px;
    height: 36px;
    background: var(--color-border);
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 50px rgba(20, 184, 166, 0.55);
    background: var(--gradient-primary-2);
}

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

.btn-ghost:hover {
    background: var(--color-card-hover);
    border-color: var(--color-primary);
    transform: translateY(-3px);
}

/* ===== Hero 视觉 - 手机堆叠 ===== */
.hero-visual {
    position: relative;
    height: 560px;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 1.2s ease 0.2s both;
}

.glow-orb {
    position: absolute;
    width: 380px;
    height: 380px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(20, 184, 166, 0.4) 0%, transparent 70%);
    filter: blur(40px);
    z-index: -1;
    animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.6; }
    50% { transform: scale(1.15); opacity: 0.9; }
}

.phone-stack {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    transform-style: preserve-3d;
}

.phone {
    position: absolute;
    width: 240px;
    height: 480px;
    border-radius: 32px;
    overflow: hidden;
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6),
                0 0 0 2px rgba(255, 255, 255, 0.08),
                inset 0 0 0 8px rgba(255, 255, 255, 0.03);
    transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
    background: var(--color-bg-2);
}

.phone img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.phone::before {
    content: '';
    position: absolute;
    top: 12px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 6px;
    background: rgba(0, 0, 0, 0.4);
    border-radius: 4px;
    z-index: 2;
}

.phone-1 {
    transform: translate(calc(0px + var(--mx, 0px)), calc(-20px + var(--my, 0px))) rotate(-2deg);
    z-index: 3;
    animation: floatPhone 6s ease-in-out infinite;
}

.phone-2 {
    transform: translate(calc(-90px + var(--mx, 0px)), calc(20px + var(--my, 0px))) rotate(-8deg) scale(0.92);
    z-index: 2;
    animation: floatPhone 7s ease-in-out infinite 0.5s;
    opacity: 0.95;
}

.phone-3 {
    transform: translate(calc(90px + var(--mx, 0px)), calc(30px + var(--my, 0px))) rotate(8deg) scale(0.85);
    z-index: 1;
    animation: floatPhone 8s ease-in-out infinite 1s;
    opacity: 0.9;
}

@keyframes floatPhone {
    0%, 100% { translate: 0 0; }
    50% { translate: 0 -15px; }
}

.phone-stack:hover .phone-1 {
    transform: translate(0, -30px) rotate(0deg);
}

.phone-stack:hover .phone-2 {
    transform: translate(-130px, 10px) rotate(-12deg) scale(0.92);
}

.phone-stack:hover .phone-3 {
    transform: translate(130px, 20px) rotate(12deg) scale(0.85);
}

/* 滚动提示 */
.scroll-hint {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    font-size: 12px;
    color: var(--color-text-dim);
    letter-spacing: 2px;
    animation: fadeIn 1s ease 1.5s both;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-primary), transparent);
    position: relative;
    overflow: hidden;
}

.scroll-line::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 50%;
    background: var(--color-text);
    animation: scrollDown 2s ease-in-out infinite;
}

@keyframes scrollDown {
    0% { transform: translateY(-100%); }
    100% { transform: translateY(200%); }
}

/* ===== 数据统计 ===== */
.stats {
    padding: 60px 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    background: rgba(0, 0, 0, 0.2);
}

.stats-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    text-align: center;
}

.stat-item {
    position: relative;
}

.stat-item:not(:last-child)::after {
    content: '';
    position: absolute;
    right: -20px;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 50px;
    background: var(--color-border);
}

.stat-number {
    font-size: clamp(36px, 5vw, 52px);
    font-weight: 800;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    color: var(--color-text-muted);
    letter-spacing: 1px;
}

/* ===== 通用 section 头部 ===== */
.section-header {
    text-align: center;
    max-width: 680px;
    margin: 0 auto 60px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(20, 184, 166, 0.1);
    border: 1px solid var(--color-border);
    border-radius: 50px;
    font-size: 12px;
    color: var(--color-primary-2);
    letter-spacing: 1.5px;
    margin-bottom: 16px;
    text-transform: uppercase;
}

.section-title {
    font-size: clamp(30px, 4vw, 44px);
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-subtitle {
    font-size: 16px;
    color: var(--color-text-muted);
}

/* ===== 功能特性 ===== */
.features {
    background: var(--color-bg);
}

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

.feature-card {
    padding: 36px 30px;
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    background: var(--color-card-hover);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-card);
}

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

.feature-icon {
    font-size: 40px;
    margin-bottom: 20px;
    display: inline-block;
    width: 72px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(20, 184, 166, 0.1);
    border-radius: 18px;
}

.feature-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-desc {
    font-size: 14px;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* ===== 用户评价 ===== */
.reviews {
    background: var(--color-bg-2);
    position: relative;
}

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

.review-card {
    padding: 32px 28px;
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.review-card:hover {
    transform: translateY(-6px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-card);
}

.review-stars {
    color: #FFB400;
    font-size: 16px;
    letter-spacing: 2px;
}

.review-text {
    font-size: 15px;
    color: var(--color-text);
    line-height: 1.8;
    flex: 1;
}

.review-author {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
}

.author-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
    color: #fff;
}

.author-name {
    font-size: 15px;
    font-weight: 600;
}

.author-role {
    font-size: 12px;
    color: var(--color-text-dim);
}

/* ===== 常见问题 FAQ ===== */
.faq {
    background: var(--color-bg);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: rgba(20, 184, 166, 0.4);
}

.faq-item.active {
    border-color: var(--color-primary);
    background: var(--color-card-hover);
}

.faq-question {
    width: 100%;
    padding: 22px 26px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    font-size: 16px;
    font-weight: 600;
    text-align: left;
    color: var(--color-text);
    transition: var(--transition);
}

.faq-icon {
    position: relative;
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.faq-icon::before,
.faq-icon::after {
    content: '';
    position: absolute;
    background: var(--color-primary-2);
    border-radius: 2px;
    transition: var(--transition);
}

.faq-icon::before {
    top: 50%;
    left: 0;
    width: 100%;
    height: 2px;
    transform: translateY(-50%);
}

.faq-icon::after {
    left: 50%;
    top: 0;
    width: 2px;
    height: 100%;
    transform: translateX(-50%);
}

.faq-item.active .faq-icon::after {
    transform: translateX(-50%) rotate(90deg);
    opacity: 0;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
    padding: 0 26px;
}

.faq-item.active .faq-answer {
    max-height: 400px;
    padding: 0 26px 22px;
}

.faq-answer p {
    font-size: 14px;
    color: var(--color-text-muted);
    line-height: 1.8;
}

/* ===== 下载区域 ===== */
.download {
    background: var(--color-bg-2);
    position: relative;
    overflow: hidden;
}

.download-card {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding: 70px 50px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    text-align: center;
    border: 1px solid var(--color-border);
}

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

.download-bg::before {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: var(--color-primary);
    filter: blur(120px);
    opacity: 0.35;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    animation: pulse 5s ease-in-out infinite;
}

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

.download-tag {
    display: inline-block;
    padding: 6px 18px;
    background: rgba(20, 184, 166, 0.15);
    border: 1px solid var(--color-border);
    border-radius: 50px;
    font-size: 12px;
    color: var(--color-primary-2);
    letter-spacing: 1.5px;
    margin-bottom: 20px;
    text-transform: uppercase;
}

.download-title {
    font-size: clamp(32px, 4.5vw, 48px);
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.2;
    letter-spacing: -0.5px;
}

.download-desc {
    font-size: 16px;
    color: var(--color-text-muted);
    margin-bottom: 32px;
}

.download-meta {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 16px 40px;
    margin-bottom: 40px;
    padding: 24px 32px;
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    backdrop-filter: blur(10px);
}

.dmeta {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.dmeta-label {
    font-size: 12px;
    color: var(--color-text-dim);
    letter-spacing: 0.5px;
}

.dmeta-value {
    font-size: 17px;
    font-weight: 700;
    color: var(--color-text);
}

.btn-download {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 20px 56px;
    background: var(--gradient-primary);
    color: #fff;
    border-radius: 50px;
    font-size: 18px;
    font-weight: 700;
    transition: var(--transition);
    box-shadow: 0 10px 40px rgba(20, 184, 166, 0.5);
    position: relative;
    overflow: hidden;
}

.btn-download::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.6s ease;
}

.btn-download:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 20px 60px rgba(20, 184, 166, 0.7);
    background: var(--gradient-primary-2);
}

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

.btn-download-icon {
    font-size: 22px;
}

.download-tip {
    font-size: 12px;
    color: var(--color-text-dim);
    margin-top: 20px;
}

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

.footer-container {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 60px;
    padding-bottom: 40px;
}

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-desc {
    font-size: 14px;
    color: var(--color-text-muted);
    max-width: 320px;
}

.footer-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.footer-col h4 {
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--color-text);
    letter-spacing: 0.5px;
}

.footer-col a {
    display: block;
    font-size: 14px;
    color: var(--color-text-muted);
    padding: 6px 0;
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--color-primary-2);
    transform: translateX(4px);
}

.footer-bottom {
    padding: 24px 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: var(--color-text-dim);
}

/* ===== 回到顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: #fff;
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-glow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
}

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

.back-to-top:hover {
    transform: translateY(-4px) scale(1.1);
    box-shadow: 0 15px 50px rgba(20, 184, 166, 0.65);
}

/* ===== 滚动入场动画 ===== */
[data-reveal] {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

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

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

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* ===== 响应式 ===== */
@media (max-width: 992px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .hero-content {
        order: 2;
    }

    .hero-visual {
        order: 1;
        height: 420px;
    }

    .hero-desc {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-meta,
    .hero-actions {
        margin-left: auto;
        margin-right: auto;
        justify-content: center;
    }

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

    .footer-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .phone {
        width: 200px;
        height: 400px;
    }

    .phone-2 {
        transform: translate(-70px, 20px) rotate(-8deg) scale(0.92);
    }

    .phone-3 {
        transform: translate(70px, 30px) rotate(8deg) scale(0.85);
    }
}

@media (max-width: 768px) {
    .section {
        padding: 70px 0;
    }

    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        flex-direction: column;
        align-items: stretch;
        background: rgba(10, 22, 40, 0.98);
        backdrop-filter: blur(20px);
        padding: 90px 24px 40px;
        gap: 8px;
        transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        border-left: 1px solid var(--color-border);
    }

    .nav.active {
        right: 0;
    }

    .nav-link {
        padding: 14px 18px;
        font-size: 16px;
        border-radius: var(--radius-md);
    }

    .nav-cta {
        margin-top: 12px;
        text-align: center;
    }

    .menu-toggle {
        display: flex;
        z-index: 1001;
    }

    .hero {
        padding: 110px 0 60px;
        min-height: auto;
    }

    .hero-visual {
        height: 380px;
    }

    .phone {
        width: 170px;
        height: 340px;
    }

    .phone-2 {
        transform: translate(-60px, 15px) rotate(-8deg) scale(0.9);
    }

    .phone-3 {
        transform: translate(60px, 25px) rotate(8deg) scale(0.85);
    }

    .stats-container {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .stat-item:not(:last-child)::after {
        display: none;
    }

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

    .download-card {
        padding: 50px 24px;
    }

    .download-meta {
        gap: 16px 24px;
        padding: 20px;
    }

    .btn-download {
        padding: 18px 40px;
        font-size: 16px;
        width: 100%;
    }

    .footer-links {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 42px;
        height: 42px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 18px;
    }

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

    .hero-meta {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }

    .meta-divider {
        display: none;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
    }

    .phone {
        width: 150px;
        height: 300px;
    }

    .phone-2 {
        transform: translate(-50px, 10px) rotate(-8deg) scale(0.9);
    }

    .phone-3 {
        transform: translate(50px, 20px) rotate(8deg) scale(0.85);
    }
}

/* ===== 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;
        scroll-behavior: auto !important;
    }
}