/* WEEX 唯客交易所 - 专业加密货币交易平台样式表 */

/* ===== 基础重置与变量 ===== */
:root {
    --primary-color: #0a84ff;
    --primary-dark: #0066cc;
    --secondary-color: #1a1a2e;
    --accent-color: #00d4aa;
    --background-dark: #0d0d1a;
    --background-light: #151528;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --gradient-primary: linear-gradient(135deg, #0a84ff 0%, #00d4aa 100%);
    --gradient-hero: linear-gradient(180deg, #0d0d1a 0%, #1a1a2e 100%);
    --shadow-soft: 0 4px 20px rgba(10, 132, 255, 0.15);
    --shadow-strong: 0 8px 40px rgba(10, 132, 255, 0.25);
    --border-radius: 12px;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-dark);
    overflow-x: hidden;
}

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

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

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

@keyframes gradientFlow {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

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

@keyframes blink {
    0%, 50%, 100% {
        opacity: 1;
    }
    25%, 75% {
        opacity: 0.5;
    }
}

/* ===== 容器与布局 ===== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 80px 0;
    position: relative;
}

/* ===== 导航栏 ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(13, 13, 26, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-smooth);
}

.header.scrolled {
    background: rgba(13, 13, 26, 0.98);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo-icon {
    width: 45px;
    height: 45px;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: bold;
    color: #fff;
    animation: float 3s ease-in-out infinite;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 35px;
    list-style: none;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-smooth);
    position: relative;
    padding: 5px 0;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition-smooth);
}

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

.nav-menu a:hover::after {
    width: 100%;
}

.nav-cta {
    background: var(--gradient-primary);
    color: #fff !important;
    padding: 10px 24px !important;
    border-radius: 8px;
    font-weight: 600;
}

.nav-cta::after {
    display: none !important;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-strong);
}

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

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition-smooth);
}

/* ===== Hero 区域 ===== */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
    padding-top: 80px;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 30%, rgba(10, 132, 255, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 70%, rgba(0, 212, 170, 0.08) 0%, transparent 50%);
    animation: gradientFlow 15s ease infinite;
}

.hero-grid {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(10, 132, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(10, 132, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.hero-particles {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--primary-color);
    border-radius: 50%;
    opacity: 0.6;
    animation: float 6s ease-in-out infinite;
}

.particle:nth-child(1) { top: 20%; left: 10%; animation-delay: 0s; }
.particle:nth-child(2) { top: 60%; left: 20%; animation-delay: 1s; }
.particle:nth-child(3) { top: 30%; left: 80%; animation-delay: 2s; }
.particle:nth-child(4) { top: 70%; left: 70%; animation-delay: 3s; }
.particle:nth-child(5) { top: 40%; left: 50%; animation-delay: 4s; }
.particle:nth-child(6) { top: 80%; left: 30%; animation-delay: 5s; }

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-text {
    animation: fadeInLeft 1s ease-out;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(10, 132, 255, 0.1);
    border: 1px solid rgba(10, 132, 255, 0.3);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 14px;
    color: var(--primary-color);
    margin-bottom: 24px;
}

.hero-badge::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--accent-color);
    border-radius: 50%;
    animation: blink 2s infinite;
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

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

.hero-description {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 36px;
    max-width: 520px;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-bottom: 40px;
    padding: 24px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

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

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 4px;
}

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

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    border-radius: 10px;
    transition: var(--transition-smooth);
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-strong);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

.hero-image {
    animation: fadeInRight 1s ease-out;
    position: relative;
}

.hero-image-wrapper {
    position: relative;
    border-radius: 24px;
    overflow: hidden;
    box-shadow: var(--shadow-strong);
}

.hero-image-wrapper::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: var(--gradient-primary);
    border-radius: 26px;
    z-index: -1;
    opacity: 0.5;
}

.hero-img {
    width: 100%;
    height: auto;
    border-radius: 24px;
    display: block;
}

.hero-float-card {
    position: absolute;
    background: rgba(26, 26, 46, 0.95);
    backdrop-filter: blur(20px);
    padding: 16px 20px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    animation: float 4s ease-in-out infinite;
}

.hero-float-card.card-1 {
    top: 10%;
    right: -30px;
    animation-delay: 0s;
}

.hero-float-card.card-2 {
    bottom: 15%;
    left: -30px;
    animation-delay: 2s;
}

.float-card-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 10px;
    font-size: 18px;
}

.float-card-title {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 4px;
}

.float-card-value {
    font-size: 20px;
    font-weight: 700;
    color: var(--accent-color);
}

/* ===== 核心特性区域 ===== */
#features {
    background: var(--background-light);
    position: relative;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-label {
    display: inline-block;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

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

.section-description {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    background: var(--background-dark);
    border-radius: var(--border-radius);
    padding: 36px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-smooth);
    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);
    transition: var(--transition-smooth);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-strong);
    border-color: rgba(10, 132, 255, 0.2);
}

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

.feature-icon {
    width: 64px;
    height: 64px;
    background: rgba(10, 132, 255, 0.1);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    font-size: 28px;
    transition: var(--transition-smooth);
}

.feature-card:hover .feature-icon {
    background: var(--gradient-primary);
    transform: scale(1.1);
}

.feature-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 14px;
}

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

.feature-list {
    list-style: none;
    margin-top: 16px;
}

.feature-list li {
    font-size: 14px;
    color: var(--text-secondary);
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

/* ===== 服务介绍区域 ===== */
#services {
    background: var(--background-dark);
    position: relative;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.service-card {
    background: var(--background-light);
    border-radius: var(--border-radius);
    padding: 40px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-smooth);
    display: flex;
    gap: 24px;
}

.service-card:hover {
    border-color: rgba(10, 132, 255, 0.3);
    box-shadow: var(--shadow-soft);
}

.service-icon {
    width: 72px;
    height: 72px;
    min-width: 72px;
    background: var(--gradient-primary);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
}

.service-content {
    flex: 1;
}

.service-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 12px;
}

.service-description {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.service-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.service-tag {
    background: rgba(10, 132, 255, 0.1);
    color: var(--primary-color);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
}

/* ===== 数据统计区域 ===== */
#stats {
    background: var(--gradient-primary);
    padding: 60px 0;
    position: relative;
    overflow: hidden;
}

#stats::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    position: relative;
    z-index: 1;
}

.stats-item {
    text-align: center;
    color: #fff;
}

.stats-value {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 8px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.stats-label {
    font-size: 16px;
    opacity: 0.9;
}

/* ===== 平台优势区域 ===== */
#advantages {
    background: var(--background-light);
}

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

.advantage-card {
    text-align: center;
    padding: 32px 24px;
    background: var(--background-dark);
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-smooth);
}

.advantage-card:hover {
    transform: translateY(-5px);
    border-color: rgba(0, 212, 170, 0.3);
}

.advantage-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 20px;
    background: rgba(0, 212, 170, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--accent-color);
    transition: var(--transition-smooth);
}

.advantage-card:hover .advantage-icon {
    background: var(--accent-color);
    color: #fff;
}

.advantage-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
}

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

/* ===== 常见问题区域 ===== */
#faq {
    background: var(--background-dark);
}

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

.faq-item {
    background: var(--background-light);
    border-radius: var(--border-radius);
    padding: 28px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-smooth);
}

.faq-item:hover {
    border-color: rgba(10, 132, 255, 0.3);
}

.faq-question {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.faq-question::before {
    content: 'Q';
    min-width: 28px;
    height: 28px;
    background: var(--gradient-primary);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    color: #fff;
}

.faq-answer {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
    padding-left: 40px;
}

/* ===== CTA 行动号召区域 ===== */
#cta {
    background: var(--background-light);
    position: relative;
    overflow: hidden;
}

.cta-wrapper {
    background: var(--gradient-primary);
    border-radius: 24px;
    padding: 80px 60px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-wrapper::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 60%);
    animation: gradientFlow 10s ease infinite;
}

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

.cta-title {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 20px;
    color: #fff;
}

.cta-description {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 36px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    color: #fff;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

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

.btn-white:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-3px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: #fff;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--background-dark);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 50px;
}

.footer-brand {
    max-width: 320px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.footer-brand-description {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition-smooth);
}

.social-link:hover {
    background: var(--gradient-primary);
    color: #fff;
}

.footer-column h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition-smooth);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

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

.footer-bottom-links {
    display: flex;
    gap: 24px;
}

.footer-bottom-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition-smooth);
}

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

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .hero-text {
        order: 1;
    }

    .hero-image {
        order: 2;
    }

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

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

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

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

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

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }

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

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--background-dark);
        flex-direction: column;
        padding: 20px;
        gap: 15px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    .nav-menu.active {
        display: flex;
    }

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

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

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

    .section {
        padding: 60px 0;
    }

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

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

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

    .stats-value {
        font-size: 36px;
    }

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

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

    .cta-wrapper {
        padding: 50px 30px;
    }

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

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

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

    .hero-float-card {
        display: none;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .section-title {
        font-size: 26px;
    }

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

    .service-card {
        flex-direction: column;
        text-align: center;
    }

    .service-features {
        justify-content: center;
    }
}

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

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== 加载动画 ===== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--background-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-overlay.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* ===== 回到顶部按钮 ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-smooth);
    z-index: 999;
    border: none;
    box-shadow: var(--shadow-soft);
}

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

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-strong);
}