:root {
    --primary: #4f46e5;
    --primary-light: #818cf8;
    --primary-dark: #3730a3;
    --accent: #f97316;
    --bg: #f8fafc;
    --card: #ffffff;
    --text: #1e293b;
    --text-light: #64748b;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --radius: 16px;
    --nav-bg: rgba(255,255,255,0.85);
    --menu-bg: rgba(255,255,255,0.98);
    --glass-white: rgba(255,255,255,0.1);
    --glass-white-strong: rgba(255,255,255,0.15);
    --soft-gray: #f1f5f9;
    --carousel-arrow: rgba(255,255,255,0.9);
}

/* 深色模式 */
[data-theme="dark"] {
    --primary: #818cf8;
    --primary-light: #a5b4fc;
    --primary-dark: #6366f1;
    --accent: #fb923c;
    --bg: #0f172a;
    --card: #1e293b;
    --text: #f1f5f9;
    --text-light: #94a3b8;
    --border: #334155;
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.4), 0 2px 4px -2px rgba(0,0,0,0.3);
    --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.5), 0 8px 10px -6px rgba(0,0,0,0.4);
    --nav-bg: rgba(15,23,42,0.85);
    --menu-bg: rgba(15,23,42,0.98);
    --glass-white: rgba(255,255,255,0.06);
    --glass-white-strong: rgba(255,255,255,0.12);
    --soft-gray: #1e293b;
    --carousel-arrow: rgba(30,41,59,0.9);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ============ 导航栏 ============ */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 1000;
    border-bottom: 1px solid var(--border);
    transition: all 0.3s;
}
.navbar.scrolled { box-shadow: var(--shadow); }
.navbar-inner {
    max-width: 1200px; margin: 0 auto;
    padding: 0 24px;
    display: flex; align-items: center; justify-content: space-between;
    height: 64px;
}
.nav-logo {
    font-size: 1.5rem; font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    cursor: pointer;
}
.nav-links { display: flex; gap: 32px; list-style: none; }
.nav-links a {
    text-decoration: none; color: var(--text);
    font-weight: 500; font-size: 0.925rem;
    transition: color 0.3s;
}
.nav-links a:hover { color: var(--primary); }
.nav-cta {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff; padding: 10px 24px; border-radius: 50px;
    text-decoration: none; font-weight: 600; font-size: 0.875rem;
    transition: transform 0.3s, box-shadow 0.3s;
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }

/* 主题切换按钮 */
.theme-toggle {
    background: none; border: 1.5px solid var(--border);
    width: 40px; height: 40px; border-radius: 50%;
    cursor: pointer; display: flex; align-items: center;
    justify-content: center; font-size: 1.2rem;
    transition: all 0.3s; flex-shrink: 0;
    color: var(--text);
}
.theme-toggle:hover { border-color: var(--primary); background: rgba(79,70,229,0.08); }

/* 汉堡菜单 */
.hamburger {
    display: none; flex-direction: column; justify-content: center;
    gap: 5px; background: none; border: none; cursor: pointer;
    padding: 8px; z-index: 1100;
}
.hamburger span {
    display: block; width: 24px; height: 2.5px;
    background: var(--text); border-radius: 2px;
    transition: all 0.3s;
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

.mobile-menu {
    display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    background: var(--menu-bg); backdrop-filter: blur(20px);
    z-index: 1050; flex-direction: column; justify-content: center;
    align-items: center; gap: 32px;
}
.mobile-menu.active { display: flex; }
.mobile-menu a {
    text-decoration: none; color: var(--text); font-size: 1.25rem;
    font-weight: 600; transition: color 0.3s;
}
.mobile-menu a:hover { color: var(--primary); }

/* ============ Hero 首页 ============ */
.hero {
    padding: 120px 24px 80px; position: relative; overflow: hidden;
    background: radial-gradient(ellipse at 50% 0%, rgba(79, 70, 229, 0.08), transparent 70%);
}
.hero-inner {
    max-width: 1200px; margin: 0 auto;
    display: flex; align-items: center; gap: 60px;
}
.hero-left { flex: 1; max-width: 600px; }
.hero-right {
    flex-shrink: 0; width: 300px; position: relative;
    display: flex; align-items: center; justify-content: center;
}
.hero-badge {
    display: inline-block;
    background: rgba(79, 70, 229, 0.1);
    color: var(--primary); padding: 6px 20px;
    border-radius: 50px; font-size: 0.875rem; font-weight: 600;
    margin-bottom: 24px;
}
.hero h1 {
    font-size: 3.25rem; font-weight: 900;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    margin-bottom: 16px; line-height: 1.2;
}
.hero-subtitle {
    font-size: 1.1rem; color: var(--text-light);
    margin-bottom: 36px; line-height: 1.8;
}
.hero-stats {
    display: flex; gap: 40px; margin-bottom: 40px;
}
.hero-stat { text-align: center; }
.hero-stat-num {
    font-size: 1.75rem; font-weight: 800; color: var(--primary);
}
.hero-stat-label { font-size: 0.8rem; color: var(--text-light); }
.hero-buttons { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
    padding: 14px 32px; border-radius: 50px; font-weight: 600;
    font-size: 0.95rem; cursor: pointer; text-decoration: none;
    transition: all 0.3s; display: inline-flex; align-items: center; gap: 8px;
}
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff; border: none; box-shadow: 0 4px 15px rgba(79, 70, 229, 0.4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(79, 70, 229, 0.5); }
.btn-outline {
    border: 2px solid var(--border); color: var(--text);
    background: var(--card);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

/* 悬浮手机 */
.floating-phone {
    position: relative; width: 260px; height: 480px;
    background: linear-gradient(160deg, #4f46e5 0%, #3730a3 40%, #1e1b4b 100%);
    border-radius: 36px; border: 6px solid #2c2c2e;
    box-shadow:
        0 0 0 2px #48484a,
        0 30px 60px rgba(79,70,229,0.3),
        0 10px 20px rgba(0,0,0,0.15);
    animation: phone-float 5s ease-in-out infinite;
    overflow: hidden;
}
@keyframes phone-float {
    0%, 100% { transform: translateY(0) rotate(-2deg); }
    50% { transform: translateY(-18px) rotate(2deg); }
}
/* 灵动岛 */
.floating-phone::before {
    content: ''; position: absolute; top: 8px; left: 50%; transform: translateX(-50%);
    width: 70px; height: 22px; background: #000;
    border-radius: 12px; z-index: 5;
}
/* 屏幕内容 */
.floating-phone .fp-screen {
    position: absolute; inset: 4px; border-radius: 30px;
    display: flex; flex-direction: column; align-items: center;
    justify-content: center; padding: 50px 24px 24px;
    text-align: center; color: #fff;
}
.floating-phone .fp-logo {
    width: 56px; height: 56px; border-radius: 16px;
    background: linear-gradient(135deg, #818cf8, #f97316);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.8rem; margin-bottom: 16px;
    box-shadow: 0 8px 25px rgba(79,70,229,0.4);
}
.floating-phone .fp-name {
    font-size: 1.2rem; font-weight: 800; margin-bottom: 6px;
}
.floating-phone .fp-tag {
    font-size: 0.7rem; opacity: 0.7; margin-bottom: 24px;
}
.floating-phone .fp-icons {
    display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px;
    width: 100%;
}
.floating-phone .fp-item {
    background: rgba(255,255,255,0.1); border-radius: 14px;
    padding: 14px 12px; font-size: 0.7rem; font-weight: 600;
    backdrop-filter: blur(5px);
}

/* ============ 分段标题 ============ */
.section { padding: 80px 24px; }
.section-header {
    text-align: center; max-width: 700px; margin: 0 auto 56px;
}
.section-tag {
    display: inline-block;
    background: rgba(79, 70, 229, 0.1);
    color: var(--primary); padding: 4px 16px;
    border-radius: 50px; font-size: 0.8rem; font-weight: 600;
    margin-bottom: 12px; text-transform: uppercase; letter-spacing: 0.05em;
}
.section-header h2 {
    font-size: 2.25rem; font-weight: 800; margin-bottom: 12px;
}
.section-header p {
    color: var(--text-light); font-size: 1.05rem;
}

/* ============ 轮播 — iPhone 17 Pro Max 竖屏 ============ */
.carousel-section { background: var(--card); }
.carousel-container {
    max-width: 402px; margin: 0 auto; position: relative;
    border-radius: 44px; overflow: hidden;
    box-shadow:
        0 0 0 7px #2c2c2e,
        0 0 0 9px #48484a,
        0 20px 50px rgba(0,0,0,0.25);
}
/* 灵动岛 Dynamic Island */
.carousel-container::before {
    content: ''; position: absolute; top: 10px; left: 50%; transform: translateX(-50%);
    width: 100px; height: 28px; background: #000;
    border-radius: 20px; z-index: 20;
}
.carousel-track-wrapper { overflow: hidden; }
.carousel-track {
    display: flex; transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}
.carousel-slide {
    min-width: 100%; position: relative;
    height: 740px; display: flex; align-items: center; justify-content: center;
    overflow: hidden;
}
.slide-bg {
    position: absolute; inset: 0;
    background-size: cover; background-position: center;
    transition: transform 0.5s;
}
.slide-screen-top {
    position: absolute; top: 0; left: 0; right: 0; height: 44px;
    z-index: 5; display: flex; align-items: center; justify-content: space-between;
    padding: 14px 30px 0; font-size: 0.7rem; color: #fff;
    font-weight: 600; letter-spacing: 0.02em;
}
.slide-screen-top .time { margin-top: 2px; }
.slide-screen-top .icons { display: flex; align-items: center; gap: 5px; font-size: 0.6rem; margin-top: 2px; }
.carousel-slide:hover .slide-bg { transform: scale(1.05); }

.slide-content {
    position: relative; z-index: 2; color: #fff; text-align: center;
    background: rgba(0, 0, 0, 0.4); padding: 32px 24px; border-radius: 20px;
    backdrop-filter: blur(12px); margin: 0 24px;
}
.slide-icon {
    font-size: 2.5rem; margin-bottom: 12px; display: block;
}
.slide-content h3 { font-size: 1.35rem; margin-bottom: 6px; font-weight: 700; }
.slide-content p { font-size: 0.85rem; opacity: 0.9; }

.carousel-arrow {
    position: absolute; top: 50%; transform: translateY(-50%);
    width: 48px; height: 48px; border-radius: 50%; border: none;
    background: var(--carousel-arrow); cursor: pointer; z-index: 10;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.25rem; color: var(--text);
    box-shadow: var(--shadow); transition: all 0.3s;
}
.carousel-arrow:hover { background: var(--card); transform: translateY(-50%) scale(1.1); }
.carousel-arrow.prev { left: 16px; }
.carousel-arrow.next { right: 16px; }

.carousel-dots {
    display: flex; justify-content: center; gap: 10px;
    margin-top: 20px;
}
.carousel-dot {
    width: 10px; height: 10px; border-radius: 50%;
    background: var(--border); border: none; cursor: pointer;
    transition: all 0.3s;
}
.carousel-dot.active {
    background: var(--primary); width: 32px; border-radius: 50px;
}

/* ============ 功能亮点 ============ */
.features-grid {
    max-width: 1100px; margin: 0 auto;
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.feature-card {
    background: var(--card); border-radius: var(--radius); padding: 32px 24px;
    text-align: center; box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.feature-icon {
    width: 64px; height: 64px; border-radius: 18px;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 20px; font-size: 1.75rem;
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(249, 115, 22, 0.1));
}
.feature-card h3 { font-size: 1.1rem; margin-bottom: 8px; font-weight: 700; }
.feature-card p { color: var(--text-light); font-size: 0.875rem; }

/* ============ 价格 ============ */
.pricing-section { background: linear-gradient(180deg, var(--card), var(--bg)); }
.pricing-grid {
    max-width: 1100px; margin: 0 auto;
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
    align-items: start;
}
.pricing-card {
    background: var(--card); border-radius: var(--radius); padding: 36px 28px;
    text-align: center; border: 2px solid var(--border);
    transition: all 0.3s; position: relative;
}
.pricing-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.pricing-card.popular {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
    transform: scale(1.04);
    z-index: 2;
}
.pricing-card.popular:hover { transform: scale(1.04) translateY(-6px); }
.popular-badge {
    position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff; padding: 4px 20px; border-radius: 50px;
    font-size: 0.8rem; font-weight: 700;
}
.pricing-name { font-size: 1.25rem; font-weight: 700; margin-bottom: 4px; }
.pricing-desc { color: var(--text-light); font-size: 0.85rem; margin-bottom: 20px; }
.pricing-price {
    font-size: 3rem; font-weight: 900; color: var(--primary);
    margin-bottom: 4px;
}
.pricing-price .currency { font-size: 1.5rem; vertical-align: super; }
.pricing-price .period { font-size: 1rem; color: var(--text-light); font-weight: 400; }
.pricing-old { color: var(--text-light); text-decoration: line-through; font-size: 0.9rem; margin-bottom: 24px; }
.pricing-features {
    list-style: none; text-align: left; margin-bottom: 28px;
}
.pricing-features li {
    padding: 8px 0; font-size: 0.9rem; color: var(--text);
    display: flex; align-items: flex-start; gap: 10px;
}
.pricing-features li::before {
    content: '✓'; color: #10b981; font-weight: 700; flex-shrink: 0;
}
.pricing-features li.disabled { color: var(--text-light); opacity: 0.5; }
.pricing-features li.disabled::before { content: '—'; color: var(--text-light); }
.pricing-card .btn {
    width: 100%; justify-content: center; padding: 12px;
}

/* ============ 联系方式 — 现代简约 ============ */
.contact-section {
    background: linear-gradient(180deg, var(--soft-gray) 0%, var(--card) 30%);
}
.contact-bar {
    max-width: 850px; margin: 0 auto;
    display: flex; align-items: center; justify-content: center;
    gap: 0; background: var(--card); border-radius: 20px;
    padding: 48px 40px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04), 0 8px 30px rgba(0,0,0,0.05);
    flex-wrap: wrap;
}
.contact-item {
    flex: 1; min-width: 200px; display: flex;
    align-items: center; gap: 16px; padding: 12px 32px;
}
.contact-divider {
    width: 1px; height: 48px; background: #e2e8f0; flex-shrink: 0;
}
.contact-item-icon {
    width: 48px; height: 48px; border-radius: 14px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.3rem; flex-shrink: 0;
    background: var(--soft-gray);
}
.contact-item-icon.email { color: #4f46e5; }
.contact-item-icon.phone { color: #059669; }
.contact-item-icon.addr { color: #f97316; }
.contact-item-info { }
.contact-item-label {
    font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em;
    color: #94a3b8; font-weight: 600; margin-bottom: 2px;
}
.contact-item-value {
    font-size: 0.95rem; color: var(--text); font-weight: 600;
}
.contact-item-sub {
    font-size: 0.8rem; color: var(--text-light); margin-top: 1px;
}
.contact-chat-btn {
    display: inline-flex; align-items: center; gap: 8px;
    margin-top: 32px; padding: 12px 32px; border-radius: 50px;
    background: var(--primary); color: #fff; text-decoration: none;
    font-weight: 600; font-size: 0.9rem;
    transition: all 0.3s; box-shadow: 0 4px 15px rgba(79,70,229,0.3);
}
.contact-chat-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(79,70,229,0.4); }

/* ============ 下载区 — 自动检测版 ============ */
.download-section {
    text-align: center; padding: 80px 24px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
}
.download-section h2 { font-size: 2.25rem; font-weight: 800; margin-bottom: 8px; }
.download-section .dl-subtitle { opacity: 0.8; font-size: 1.05rem; margin-bottom: 12px; }

.dl-detect-banner {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 24px; border-radius: 50px;
    background: var(--glass-white-strong); backdrop-filter: blur(10px);
    margin-bottom: 36px; font-weight: 600; font-size: 0.95rem;
}
.dl-detect-banner .dot {
    width: 8px; height: 8px; border-radius: 50%;
    background: #10b981; animation: pulse-dot 1.5s infinite;
}
@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.4; transform: scale(1.6); }
}

.dl-grid {
    max-width: 900px; margin: 0 auto;
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.dl-card {
    background: var(--glass-white); backdrop-filter: blur(10px);
    border: 2px solid rgba(255,255,255,0.12);
    border-radius: var(--radius); padding: 28px 16px;
    text-align: center; text-decoration: none; color: #fff;
    transition: all 0.3s; position: relative; cursor: pointer;
}
.dl-card:hover {
    background: rgba(255,255,255,0.15); transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}
.dl-card.recommended {
    border-color: #10b981;
    background: rgba(16,185,129,0.15);
    box-shadow: 0 0 30px rgba(16,185,129,0.2);
    animation: glow-pulse 2s ease-in-out infinite;
}
@keyframes glow-pulse {
    0%, 100% { box-shadow: 0 0 20px rgba(16,185,129,0.2); }
    50% { box-shadow: 0 0 40px rgba(16,185,129,0.45); }
}
.dl-card .rec-badge {
    position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
    background: #10b981; color: #fff; padding: 3px 16px;
    border-radius: 50px; font-size: 0.75rem; font-weight: 700;
}
.dl-card-icon { font-size: 2.5rem; margin-bottom: 12px; display: block; }
.dl-card-name { font-size: 1rem; font-weight: 700; margin-bottom: 4px; }
.dl-card-ver { font-size: 0.75rem; opacity: 0.6; margin-bottom: 16px; }
.dl-card-btn {
    display: inline-block; padding: 8px 24px; border-radius: 50px;
    font-weight: 600; font-size: 0.85rem; transition: all 0.3s;
    background: rgba(255,255,255,0.2); color: #fff; cursor: pointer;
}
.dl-card.recommended .dl-card-btn {
    background: #10b981; color: #fff;
}

/* ============ 二维码区域 ============ */
.qrcode-section {
    background: var(--card); text-align: center;
}
.qrcode-grid {
    max-width: 900px; margin: 0 auto;
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px;
}
.qrcode-card {
    background: var(--card); border-radius: var(--radius);
    padding: 32px 20px 24px; text-align: center;
    border: 2px solid var(--border); transition: all 0.3s;
}
.qrcode-card:hover {
    transform: translateY(-4px); box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}
.qrcode-img {
    width: 160px; height: 160px; margin: 0 auto 16px;
    border-radius: 12px; overflow: hidden;
    background: var(--soft-gray); display: flex; align-items: center;
    justify-content: center; position: relative;
}
.qrcode-img svg { width: 140px; height: 140px; }
.qrcode-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 4px; }
.qrcode-card .qrcode-subtitle {
    color: var(--text-light); font-size: 0.85rem; margin-bottom: 12px;
}
.qrcode-tip {
    display: inline-block; padding: 4px 14px;
    background: rgba(79, 70, 229, 0.08); color: var(--primary);
    border-radius: 50px; font-size: 0.75rem; font-weight: 600;
}

/* ============ 体验区域 ============ */
.experience-section {
    background: linear-gradient(160deg, #0f172a 0%, #1e293b 40%, #172033 100%);
    color: #fff; position: relative; overflow: hidden;
}
.experience-section::before {
    content: ''; position: absolute; top: -100px; right: -100px;
    width: 400px; height: 400px; border-radius: 50%;
    background: radial-gradient(circle, rgba(79,70,229,0.15) 0%, transparent 70%);
    pointer-events: none;
}
.experience-section::after {
    content: ''; position: absolute; bottom: -50px; left: -50px;
    width: 300px; height: 300px; border-radius: 50%;
    background: radial-gradient(circle, rgba(249,115,22,0.1) 0%, transparent 70%);
    pointer-events: none;
}

.exp-platform-grid {
    max-width: 900px; margin: 0 auto 48px;
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
    position: relative; z-index: 1;
}
.exp-platform-card {
    background: var(--glass-white); backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: var(--radius); padding: 36px 24px;
    text-align: center; transition: all 0.3s; cursor: pointer;
    text-decoration: none; color: #fff; display: block;
}
.exp-platform-card:hover {
    background: rgba(255,255,255,0.12); transform: translateY(-4px);
    border-color: rgba(255,255,255,0.25); box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}
.exp-platform-card .exp-icon {
    width: 64px; height: 64px; border-radius: 20px;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 16px; font-size: 2rem;
    background: linear-gradient(135deg, rgba(79,70,229,0.3), rgba(129,140,248,0.2));
}
.exp-platform-card .exp-icon.harmony {
    background: linear-gradient(135deg, rgba(249,115,22,0.3), rgba(251,146,60,0.2));
}
.exp-platform-card .exp-icon.h5 {
    background: linear-gradient(135deg, rgba(16,185,129,0.3), rgba(52,211,153,0.2));
}
.exp-platform-card h3 {
    font-size: 1.15rem; font-weight: 700; margin-bottom: 4px;
}
.exp-platform-card .exp-desc {
    font-size: 0.8rem; opacity: 0.6;
}

.exp-feature-cloud {
    max-width: 1000px; margin: 0 auto; text-align: center;
    position: relative; z-index: 1;
}
.exp-feature-cloud .cloud-title {
    font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.1em;
    color: rgba(255,255,255,0.4); margin-bottom: 24px;
}
.exp-tags {
    display: flex; flex-wrap: wrap; justify-content: center;
    gap: 12px;
}
.exp-tag {
    padding: 10px 22px; border-radius: 50px;
    font-size: 0.9rem; font-weight: 600;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.12);
    transition: all 0.3s; cursor: default;
}
.exp-tag:hover {
    background: rgba(255,255,255,0.16); transform: translateY(-2px);
    border-color: rgba(255,255,255,0.3);
}
.exp-tag.highlight {
    background: linear-gradient(135deg, rgba(79,70,229,0.5), rgba(129,140,248,0.3));
    border-color: rgba(129,140,248,0.5);
}

/* ============ 页脚 ============ */
.footer {
    background: #0f172a; color: #94a3b8;
    padding: 56px 24px 32px;
}
.footer-grid {
    max-width: 1100px; margin: 0 auto;
    display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px; padding-bottom: 40px; border-bottom: 1px solid #1e293b;
}
.footer-brand-name {
    font-size: 1.5rem; font-weight: 800; color: #fff; margin-bottom: 12px;
}
.footer-desc { font-size: 0.875rem; line-height: 1.8; }
.footer-col h4 { color: #fff; font-size: 0.95rem; margin-bottom: 16px; font-weight: 700; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a {
    color: #94a3b8; text-decoration: none; font-size: 0.875rem;
    transition: color 0.3s;
}
.footer-col ul li a:hover { color: #fff; }
.footer-bottom {
    max-width: 1100px; margin: 0 auto; padding-top: 24px;
    display: flex; justify-content: space-between; align-items: center;
    flex-wrap: wrap; gap: 12px;
}
.footer-copyright { font-size: 0.8rem; }
.footer-icp { font-size: 0.8rem; }
.footer-icp a { color: #94a3b8; text-decoration: none; }

/* ============ 回到顶部 ============ */
.back-top {
    position: fixed; bottom: 32px; right: 32px;
    width: 48px; height: 48px; border-radius: 50%;
    background: var(--primary); color: #fff;
    border: none; cursor: pointer; font-size: 1.25rem;
    box-shadow: var(--shadow-lg); opacity: 0; visibility: hidden;
    transition: all 0.3s; z-index: 999;
    display: flex; align-items: center; justify-content: center;
}
.back-top.show { opacity: 1; visibility: visible; }
.back-top:hover { transform: translateY(-4px); }

/* ============ 动画 ============ */
.fade-in {
    opacity: 0; transform: translateY(30px);
    transition: opacity 0.6s, transform 0.6s;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
    .hero-inner { gap: 30px; }
    .hero-right { width: 240px; }
    .floating-phone { width: 220px; height: 400px; }
    .floating-phone .fp-screen { padding: 42px 16px 18px; }
    .floating-phone .fp-icons { gap: 8px; }
    .floating-phone .fp-item { padding: 10px 8px; font-size: 0.6rem; }
    .features-grid, .pricing-grid { grid-template-columns: repeat(2, 1fr); }
    .pricing-card.popular { transform: none; }
    .pricing-card.popular:hover { transform: translateY(-6px); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .qrcode-grid { grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .qrcode-img { width: 130px; height: 130px; }
    .qrcode-img svg { width: 110px; height: 110px; }
    .exp-platform-grid { grid-template-columns: repeat(3, 1fr); gap: 16px; }
}
@media (max-width: 768px) {
    .hero { padding: 100px 20px 50px; }
    .hero-inner { flex-direction: column; gap: 32px; text-align: center; }
    .hero-left { text-align: center; }
    .hero h1 { font-size: 2.25rem; }
    .section-header h2 { font-size: 1.75rem; }
    .hero-subtitle { font-size: 0.95rem; }
    .hero-stats { justify-content: center; gap: 24px; }
    .hero-buttons { justify-content: center; }
    .hero-right { width: 200px; }
    .floating-phone { width: 200px; height: 370px; border-radius: 28px; border-width: 5px; animation: none; transform: rotate(-3deg); }
    .floating-phone .fp-screen { border-radius: 22px; padding: 40px 18px 18px; }
    .floating-phone .fp-logo { width: 40px; height: 40px; border-radius: 12px; font-size: 1.2rem; margin-bottom: 10px; }
    .floating-phone .fp-name { font-size: 1rem; }
    .floating-phone .fp-icons { gap: 8px; }
    .floating-phone .fp-item { padding: 10px 8px; font-size: 0.6rem; border-radius: 10px; }
    .hero-stats { gap: 24px; }
    .carousel-container { max-width: 340px; border-radius: 36px; box-shadow: 0 0 0 5px #2c2c2e, 0 0 0 7px #48484a, var(--shadow-lg); }
    .carousel-container::before { width: 80px; height: 24px; top: 8px; border-radius: 18px; }
    .carousel-slide { height: 480px; }
    .slide-content { padding: 24px 16px; margin: 0 16px; }
    .slide-content h3 { font-size: 1.15rem; }
    .slide-icon { font-size: 2rem; }
    .features-grid, .pricing-grid { grid-template-columns: 1fr; }
    .contact-bar { flex-direction: column; padding: 32px 20px; gap: 0; }
    .contact-divider { width: 80%; height: 1px; }
    .contact-item { min-width: auto; padding: 16px 24px; justify-content: flex-start; }
    .contact-cards { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .section { padding: 60px 20px; }
    .section-header { margin-bottom: 36px; }
    .hero-stat-num { font-size: 1.4rem; }
    .nav-links { display: none; }
    .nav-cta { display: none; }
    .theme-toggle { width: 34px; height: 34px; font-size: 1rem; }
    .hamburger { display: flex; }
    .qrcode-grid { grid-template-columns: repeat(3, 1fr); gap: 12px; }
    .qrcode-card { padding: 20px 12px 16px; }
    .qrcode-img { width: 100px; height: 100px; }
    .qrcode-img svg { width: 84px; height: 84px; }
    .qrcode-card h3 { font-size: 0.9rem; }
    .exp-platform-grid { grid-template-columns: 1fr; max-width: 360px; margin-left: auto; margin-right: auto; }
    .dl-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
}
@media (max-width: 480px) {
    .hero { padding: 80px 16px 40px; }
    .hero h1 { font-size: 1.75rem; }
    .hero-subtitle { font-size: 0.85rem; }
    .hero-stats { gap: 16px; }
    .hero-stat-num { font-size: 1.2rem; }
    .hero-stat-label { font-size: 0.7rem; }
    .hero-buttons { flex-direction: column; align-items: center; }
    .hero-buttons .btn { width: 100%; max-width: 260px; text-align: center; justify-content: center; }
    .hero-right { width: 160px; }
    .floating-phone { width: 160px; height: 300px; border-radius: 24px; border-width: 4px; animation: none; }
    .floating-phone .fp-screen { border-radius: 18px; padding: 32px 14px 14px; }
    .floating-phone .fp-logo { width: 32px; height: 32px; border-radius: 10px; font-size: 1rem; margin-bottom: 8px; }
    .floating-phone .fp-name { font-size: 0.85rem; }
    .floating-phone .fp-icons { gap: 6px; grid-template-columns: repeat(2, 1fr); }
    .floating-phone .fp-item { padding: 8px 6px; font-size: 0.55rem; border-radius: 8px; }
    .section { padding: 48px 16px; }
    .section-header { margin-bottom: 28px; }
    .section-header h2 { font-size: 1.5rem; }
    .carousel-container { max-width: 290px; }
    .carousel-slide { height: 420px; }
    .slide-content { padding: 16px 12px; margin: 0 8px; }
    .slide-content h3 { font-size: 1rem; }
    .slide-icon { font-size: 1.5rem; }
    .features-grid, .pricing-grid, .footer-grid { grid-template-columns: 1fr; }
    .dl-grid { grid-template-columns: 1fr; max-width: 260px; margin: 0 auto; }
    .qrcode-grid { grid-template-columns: 1fr; max-width: 280px; }
    .qrcode-img { width: 160px; height: 160px; }
    .qrcode-img svg { width: 140px; height: 140px; }
    .footer-bottom { flex-direction: column; text-align: center; gap: 8px; }
    .navbar-inner { padding: 0 12px; }
    .back-top { right: 12px; bottom: 16px; width: 40px; height: 40px; font-size: 1rem; }
}