/* ============================================================
   币安推广导航站 - 主样式表
   文件: css/style.css
   ============================================================ */

:root {
    --binance-gold: #F0B90B;
    --binance-gold-hover: #F8D33A;
    --binance-gold-dark: #D4A500;
    --binance-dark: #1E2329;
    --binance-darker: #0B0E11;
    --binance-gray: #707A8A;
    --binance-light-gray: #F5F5F5;
    --binance-border: #EAECEF;
    --binance-white: #FFFFFF;
    --binance-success: #0ECB81;
    --binance-danger: #F6465D;
    --binance-font: "Binance Plex", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-gold: 0 4px 20px rgba(240, 185, 11, 0.35);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
    font-size: 16px;
}

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

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

/* ============ 按钮 ============ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-family: var(--binance-font);
    letter-spacing: 0.3px;
    white-space: nowrap;
}

.btn-gold {
    background-color: var(--binance-gold);
    color: var(--binance-dark);
    box-shadow: 0 2px 8px rgba(240, 185, 11, 0.3);
}

.btn-gold:hover {
    background-color: var(--binance-gold-hover);
    box-shadow: var(--shadow-gold);
    transform: translateY(-2px);
}

.btn-dark {
    background-color: var(--binance-dark);
    color: var(--binance-white);
    box-shadow: 0 2px 8px rgba(30, 35, 41, 0.3);
}

.btn-dark:hover {
    background-color: var(--binance-darker);
    box-shadow: 0 6px 20px rgba(30, 35, 41, 0.4);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    color: var(--binance-dark);
    border: 2px solid var(--binance-border);
}

.btn-outline:hover {
    border-color: var(--binance-gold);
    color: var(--binance-gold-dark);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 14px 32px;
    font-size: 1.05rem;
    border-radius: 10px;
}

.btn-xl {
    padding: 16px 40px;
    font-size: 1.15rem;
    border-radius: 12px;
}

.btn svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

/* ============ 导航栏 ============ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--binance-border);
    transition: var(--transition);
    height: 72px;
    display: flex;
    align-items: center;
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
    height: 64px;
}

.navbar-container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    flex-shrink: 0;
}

.navbar-brand img {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    transition: var(--transition);
}

.navbar-brand:hover img {
    transform: rotate(15deg);
}

.navbar-brand-text {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--binance-dark);
    letter-spacing: -0.5px;
}

.navbar-brand-text span {
    color: var(--binance-gold);
}

.navbar-links {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
}

.navbar-links a {
    text-decoration: none;
    color: var(--binance-gray);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 8px 14px;
    border-radius: 8px;
    transition: var(--transition);
    position: relative;
    white-space: nowrap;
}

.navbar-links a:hover,
.navbar-links a.active {
    color: var(--binance-dark);
    background-color: var(--binance-light-gray);
}

.navbar-links a.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background-color: var(--binance-gold);
    border-radius: 2px;
}

.navbar-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--binance-dark);
    border-radius: 2px;
    transition: var(--transition);
    transform-origin: center;
}

.hamburger.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.hamburger.open span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.hamburger.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ============ Hero 区域 ============ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 24px 80px;
    background: linear-gradient(180deg, #FAFAFA 0%, #FFFFFF 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -40%;
    right: -20%;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(240, 185, 11, 0.06) 0%, rgba(240, 185, 11, 0.02) 50%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -15%;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(30, 35, 41, 0.04) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 56px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background-color: rgba(240, 185, 11, 0.1);
    border: 1px solid rgba(240, 185, 11, 0.3);
    border-radius: 30px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--binance-gold-dark);
    margin-bottom: 24px;
    letter-spacing: 0.5px;
    animation: fadeInDown 0.6s ease-out;
}

.hero-badge svg {
    width: 16px;
    height: 16px;
}

.hero h1 {
    font-size: clamp(2.2rem, 4.5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -1px;
    margin-bottom: 20px;
    color: var(--binance-dark);
    animation: fadeInUp 0.7s ease-out;
}

.hero h1 .highlight {
    color: var(--binance-gold-dark);
    position: relative;
    display: inline-block;
}

.hero h1 .highlight::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 0;
    right: 0;
    height: 6px;
    background-color: rgba(240, 185, 11, 0.35);
    border-radius: 3px;
    z-index: -1;
}

.hero-subtitle {
    font-size: clamp(1rem, 1.4vw, 1.15rem);
    color: var(--binance-gray);
    max-width: 560px;
    margin-bottom: 36px;
    line-height: 1.8;
    animation: fadeInUp 0.7s ease-out 0.15s both;
}

.hero-buttons {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    animation: fadeInUp 0.7s ease-out 0.3s both;
}

.hero-visual {
    animation: fadeInUp 0.7s ease-out 0.2s both;
}

.hero-visual img {
    width: 100%;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--binance-border);
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    padding: 0 24px 64px;
    margin-top: -24px;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

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

.hero-stat-value {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--binance-dark);
    letter-spacing: -0.5px;
}

.hero-stat-value span {
    color: var(--binance-gold);
}

.hero-stat-label {
    font-size: 0.85rem;
    color: var(--binance-gray);
    font-weight: 500;
    margin-top: 4px;
}

.hero-stat-divider {
    width: 1px;
    height: 40px;
    background-color: var(--binance-border);
}

/* ============ 通用 Section ============ */
.section {
    padding: 100px 24px;
}

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

.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--binance-gold-dark);
    background-color: rgba(240, 185, 11, 0.1);
    padding: 6px 16px;
    border-radius: 20px;
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(1.8rem, 3vw, 2.5rem);
    font-weight: 800;
    letter-spacing: -0.8px;
    color: var(--binance-dark);
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 1rem;
    color: var(--binance-gray);
    max-width: 680px;
    margin: 0 auto;
    line-height: 1.8;
}

/* ============ 平台简介 ============ */
.intro-section {
    background-color: var(--binance-white);
    padding: 80px 24px;
}

.intro-content {
    max-width: 860px;
    margin: 0 auto;
}

.intro-content h2 {
    font-size: clamp(1.6rem, 2.6vw, 2.2rem);
    font-weight: 800;
    letter-spacing: -0.5px;
    text-align: center;
    margin-bottom: 24px;
    color: var(--binance-dark);
}

.intro-content p {
    color: var(--binance-gray);
    line-height: 2;
    margin-bottom: 16px;
    font-size: 1rem;
}

.intro-content p strong {
    color: var(--binance-dark);
}

/* ============ 市场数据 ============ */
.market-section {
    background-color: #FAFAFA;
}

.market-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.market-card {
    background: var(--binance-white);
    border: 1px solid var(--binance-border);
    border-radius: 16px;
    padding: 24px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.market-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--binance-gold), var(--binance-gold-hover));
    opacity: 0;
    transition: var(--transition);
}

.market-card:hover {
    border-color: var(--binance-gold);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

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

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

.market-card-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.market-card-icon.btc { background-color: rgba(247, 147, 26, 0.15); color: #F7931A; }
.market-card-icon.eth { background-color: rgba(98, 126, 234, 0.15); color: #627EEA; }
.market-card-icon.bnb { background-color: rgba(240, 185, 11, 0.15); color: #F0B90B; }
.market-card-icon.usdt { background-color: rgba(38, 161, 123, 0.15); color: #26A17B; }
.market-card-icon.sol { background-color: rgba(20, 241, 149, 0.15); color: #14F195; }
.market-card-icon.xrp { background-color: rgba(35, 41, 47, 0.12); color: #23292F; }

.market-card-name {
    font-weight: 700;
    font-size: 1rem;
    color: var(--binance-dark);
}

.market-card-symbol {
    font-size: 0.8rem;
    color: var(--binance-gray);
    font-weight: 500;
}

.market-card-price {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--binance-dark);
    letter-spacing: -0.5px;
    margin-bottom: 4px;
}

.market-card-change {
    font-size: 0.9rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 4px;
}

.market-card-change.positive { color: var(--binance-success); }
.market-card-change.negative { color: var(--binance-danger); }

.market-card-volume {
    font-size: 0.8rem;
    color: var(--binance-gray);
    margin-top: 8px;
}

.market-note {
    text-align: center;
    font-size: 0.8rem;
    color: var(--binance-gray);
    margin-top: 24px;
}

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--binance-white);
    border: 1px solid var(--binance-border);
    border-radius: 16px;
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    border-color: var(--binance-gold);
    box-shadow: var(--shadow-md);
    transform: translateY(-6px);
}

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background-color: rgba(240, 185, 11, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 18px;
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    background-color: var(--binance-gold);
    box-shadow: var(--shadow-gold);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
    color: var(--binance-gold-dark);
    transition: var(--transition);
}

.feature-card:hover .feature-icon svg {
    color: var(--binance-dark);
}

.feature-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--binance-dark);
    margin-bottom: 10px;
}

.feature-desc {
    font-size: 0.9rem;
    color: var(--binance-gray);
    line-height: 1.7;
}

/* ============ 安全保障 ============ */
.security-section {
    background-color: #FAFAFA;
}

.security-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.security-content h3 {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--binance-dark);
    margin-bottom: 16px;
}

.security-content p {
    color: var(--binance-gray);
    margin-bottom: 20px;
    line-height: 1.7;
}

.security-points {
    list-style: none;
}

.security-points li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid var(--binance-border);
}

.security-points li:last-child {
    border-bottom: none;
}

.security-points svg {
    width: 20px;
    height: 20px;
    color: var(--binance-gold);
    flex-shrink: 0;
    margin-top: 2px;
}

.security-points strong {
    display: block;
    color: var(--binance-dark);
    font-size: 0.95rem;
    margin-bottom: 2px;
}

.security-points span {
    font-size: 0.85rem;
    color: var(--binance-gray);
}

.security-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.security-badge {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, rgba(240, 185, 11, 0.15), rgba(240, 185, 11, 0.05));
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid rgba(240, 185, 11, 0.3);
    position: relative;
    animation: pulse 3s infinite;
}

.security-badge svg {
    width: 70px;
    height: 70px;
    color: var(--binance-gold);
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(240, 185, 11, 0.2); }
    50% { box-shadow: 0 0 0 24px rgba(240, 185, 11, 0); }
}

/* ============ 注册教程 ============ */
.steps-section {
    background-color: var(--binance-white);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
    counter-reset: step;
    max-width: 1100px;
    margin: 0 auto;
}

.step-card {
    background: var(--binance-white);
    border: 1px solid var(--binance-border);
    border-radius: 16px;
    padding: 32px 24px 28px;
    position: relative;
    transition: var(--transition);
    counter-increment: step;
}

.step-card:hover {
    border-color: var(--binance-gold);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.step-card::before {
    content: counter(step, decimal-leading-zero);
    position: absolute;
    top: 20px;
    right: 24px;
    font-size: 2rem;
    font-weight: 800;
    color: rgba(240, 185, 11, 0.25);
    line-height: 1;
}

.step-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    background-color: rgba(240, 185, 11, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 18px;
}

.step-icon svg {
    width: 26px;
    height: 26px;
    color: var(--binance-gold-dark);
}

.step-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--binance-dark);
    margin-bottom: 8px;
}

.step-card p {
    font-size: 0.88rem;
    color: var(--binance-gray);
    line-height: 1.7;
}

.steps-action {
    text-align: center;
    margin-top: 40px;
}

/* ============ 下载区域 ============ */
.download-section {
    background: linear-gradient(135deg, #1E2329 0%, #0B0E11 100%);
    position: relative;
    overflow: hidden;
}

.download-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(240, 185, 11, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.download-section::after {
    content: '';
    position: absolute;
    bottom: -40%;
    left: -5%;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(240, 185, 11, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

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

.download-section .section-title {
    color: var(--binance-white);
}

.download-section .section-subtitle {
    color: rgba(255, 255, 255, 0.6);
}

.download-section .section-tag {
    background-color: rgba(240, 185, 11, 0.15);
    color: var(--binance-gold);
}

.download-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    max-width: 800px;
    margin: 0 auto;
}

.download-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
    text-decoration: none;
    display: block;
}

.download-card:hover {
    border-color: var(--binance-gold);
    background: rgba(240, 185, 11, 0.08);
    transform: translateY(-4px);
}

.download-card-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background-color: rgba(240, 185, 11, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}

.download-card-icon svg {
    width: 28px;
    height: 28px;
    color: var(--binance-gold);
}

.download-card h3 {
    color: var(--binance-white);
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.download-card p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.85rem;
    margin-bottom: 18px;
}

.download-card .btn {
    width: 100%;
}

.download-card .btn-gold {
    box-shadow: 0 4px 20px rgba(240, 185, 11, 0.4);
}

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

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

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

.faq-item[open] {
    border-color: var(--binance-gold);
    box-shadow: var(--shadow-sm);
}

.faq-item summary {
    padding: 18px 24px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--binance-dark);
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    transition: var(--transition);
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    font-size: 1.4rem;
    font-weight: 400;
    color: var(--binance-gold-dark);
    flex-shrink: 0;
    transition: var(--transition);
    line-height: 1;
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
}

.faq-item summary:hover {
    color: var(--binance-gold-dark);
}

.faq-answer {
    padding: 0 24px 20px;
    color: var(--binance-gray);
    font-size: 0.92rem;
    line-height: 1.8;
}

.faq-answer a {
    color: var(--binance-gold-dark);
    text-decoration: none;
    font-weight: 600;
}

.faq-answer a:hover {
    text-decoration: underline;
}

/* ============ CTA 横幅 ============ */
.cta-section {
    padding: 0 24px 100px;
    background-color: var(--binance-white);
}

.cta-banner {
    max-width: 1100px;
    margin: 0 auto;
    background: linear-gradient(135deg, var(--binance-gold) 0%, #F8D33A 50%, var(--binance-gold) 100%);
    border-radius: 20px;
    padding: 56px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    pointer-events: none;
}

.cta-banner h2 {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--binance-dark);
    letter-spacing: -0.5px;
    margin-bottom: 8px;
}

.cta-banner p {
    color: rgba(30, 35, 41, 0.7);
    margin-bottom: 24px;
    font-size: 1rem;
}

.cta-banner .btn-dark {
    box-shadow: 0 4px 16px rgba(30, 35, 41, 0.3);
}

/* ============ 页脚 ============ */
.footer {
    background-color: var(--binance-darker);
    color: rgba(255, 255, 255, 0.7);
    padding: 48px 24px 32px;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--binance-white);
    font-weight: 700;
    font-size: 1.1rem;
}

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

.footer-links {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    font-size: 0.85rem;
    transition: var(--transition);
}

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

.footer-disclaimer {
    width: 100%;
    font-size: 0.78rem;
    color: rgba(255, 255, 255, 0.4);
    line-height: 1.8;
    text-align: center;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-copy {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.4);
    width: 100%;
    text-align: center;
    margin-top: 12px;
}

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

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .reveal { opacity: 1; transform: none; transition: none; }
    .hero-badge, .hero h1, .hero-subtitle, .hero-buttons, .hero-visual { animation: none; }
}

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

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

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

    .hero-visual {
        max-width: 640px;
        margin: 0 auto;
    }

    .security-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .download-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
    }
}

@media (max-width: 768px) {
    .navbar-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background-color: var(--binance-white);
        flex-direction: column;
        align-items: flex-start;
        padding: 80px 24px 24px;
        gap: 4px;
        box-shadow: -4px 0 20px rgba(0, 0, 0, 0.1);
        transition: right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 999;
        overflow-y: auto;
    }

    .navbar-links.open {
        right: 0;
    }

    .navbar-links a {
        width: 100%;
        padding: 12px 16px;
        font-size: 1rem;
    }

    .navbar-links a.active::after {
        display: none;
    }

    .navbar-links a.active {
        background-color: rgba(240, 185, 11, 0.1);
        color: var(--binance-gold-dark);
    }

    .hamburger {
        display: flex;
    }

    .navbar-actions .btn-outline {
        display: none;
    }

    .navbar-actions .btn-dark {
        display: none;
    }

    .hero {
        padding: 100px 16px 60px;
        min-height: auto;
    }

    .hero-stats {
        gap: 20px;
        padding-bottom: 40px;
    }

    .hero-stat-value {
        font-size: 1.4rem;
    }

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

    .section {
        padding: 60px 16px;
    }

    .intro-section {
        padding: 60px 16px;
    }

    .cta-section {
        padding: 0 16px 60px;
    }

    .cta-banner {
        padding: 32px 20px;
    }

    .cta-banner h2 {
        font-size: 1.4rem;
    }

    .btn-xl {
        padding: 14px 28px;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.9rem;
    }

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

    .hero-buttons .btn {
        width: 100%;
    }

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

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

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

    .footer-container {
        flex-direction: column;
        text-align: center;
    }
}