*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
:root {
    --c-deep: #05203f; --c-primary: #0a4d8c; --c-secondary: #1a8cc4; --c-accent: #00d4ff;
    --c-glow: #4fc3f7; --c-mist: #e8f4fc; --c-foam: #f0f9ff; --c-white: #ffffff;
    --c-text: #0d1b2a; --c-text-light: #5a7184; --c-text-muted: #8da9c0;
    --c-border: rgba(10,77,140,0.12); --c-glass: rgba(255,255,255,0.65);
    --c-success: #2ecc71; --c-danger: #e74c3c;
    --font-serif: "Noto Serif SC","Source Han Serif SC","SimSun",serif;
    --font-sans: "Noto Sans SC","Source Han Sans SC","Microsoft YaHei",sans-serif;
    --font-display: "Noto Serif SC",serif;
    --section-padding: 100px 0; --container-width: 1200px; --container-padding: 0 24px;
    --radius: 16px; --radius-sm: 8px; --radius-lg: 24px;
    --t-fast: 0.2s ease; --t-base: 0.35s cubic-bezier(0.25,0.46,0.45,0.94);
    --t-slow: 0.6s cubic-bezier(0.25,0.46,0.45,0.94); --t-bounce: 0.5s cubic-bezier(0.34,1.56,0.64,1);
    --shadow-sm: 0 2px 12px rgba(10,77,140,0.08); --shadow-md: 0 8px 32px rgba(10,77,140,0.12);
    --shadow-lg: 0 16px 48px rgba(10,77,140,0.18); --shadow-glow: 0 0 40px rgba(0,212,255,0.25);
}
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font-sans); color: var(--c-text); background: var(--c-white); overflow-x: hidden; line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--c-mist); }
::-webkit-scrollbar-thumb { background: var(--c-secondary); border-radius: 4px; }
::selection { background: var(--c-accent); color: var(--c-white); }
.container { max-width: var(--container-width); margin: 0 auto; padding: var(--container-padding); }
.section-title { text-align: center; margin-bottom: 60px; }
.section-title .eyebrow { display: inline-block; font-size: 0.8rem; letter-spacing: 0.3em; text-transform: uppercase; color: var(--c-secondary); font-weight: 600; margin-bottom: 12px; }
.section-title h2 { font-family: var(--font-display); font-size: 2.6rem; color: var(--c-text); font-weight: 700; letter-spacing: 0.05em; }
.section-title h2 .accent { color: var(--c-primary); }
.section-title .subtitle { margin-top: 16px; font-size: 1.05rem; color: var(--c-text-light); max-width: 600px; margin-left: auto; margin-right: auto; }
.title-underline { width: 60px; height: 3px; background: linear-gradient(90deg,var(--c-primary),var(--c-accent)); margin: 20px auto 0; border-radius: 2px; }
/* === PRELOADER === */
#preloader { position: fixed; inset: 0; background: var(--c-deep); z-index: 9999; display: flex; align-items: center; justify-content: center; flex-direction: column; transition: opacity 0.6s ease, visibility 0.6s ease; }
#preloader.hidden { opacity: 0; visibility: hidden; }
.preloader-drop { width: 50px; height: 65px; background: linear-gradient(180deg,var(--c-accent),var(--c-secondary)); border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%; transform: rotate(-45deg); animation: drop-bounce 1.2s ease-in-out infinite; box-shadow: 0 0 30px rgba(0,212,255,0.5); }
.preloader-text { margin-top: 24px; color: var(--c-foam); font-family: var(--font-display); font-size: 1.4rem; letter-spacing: 0.3em; opacity: 0.8; animation: fade-pulse 1.5s ease-in-out infinite; }
@keyframes drop-bounce { 0%,100% { transform: rotate(-45deg) translateY(0) scale(1); } 50% { transform: rotate(-45deg) translateY(-20px) scale(1.1); } }
@keyframes fade-pulse { 0%,100% { opacity: 0.4; } 50% { opacity: 0.9; } }

/* === NAVIGATION === */
#navbar { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; transition: all var(--t-base); padding: 18px 0; }
#navbar.scrolled { background: rgba(255,255,255,0.92); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); box-shadow: var(--shadow-md); padding: 12px 0; }
#navbar.scrolled .nav-link, #navbar.scrolled .nav-brand { color: var(--c-text); }
#navbar.scrolled .nav-brand .brand-sub { color: var(--c-text-light); }
.nav-inner { max-width: var(--container-width); margin: 0 auto; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; }
.nav-brand { display: flex; align-items: center; gap: 10px; cursor: pointer; color: var(--c-white); transition: color var(--t-base); }
.nav-brand .brand-icon { width: 40px; height: 40px; background: linear-gradient(135deg,var(--c-accent),var(--c-primary)); border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%; display: flex; align-items: center; justify-content: center; transform: rotate(-45deg); box-shadow: 0 4px 12px rgba(0,212,255,0.3); }
.nav-brand .brand-icon svg { transform: rotate(45deg); width: 22px; height: 22px; fill: var(--c-white); }
.nav-brand .brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.nav-brand .brand-name { font-family: var(--font-display); font-size: 1.5rem; font-weight: 700; letter-spacing: 0.05em; }
.nav-brand .brand-sub { font-size: 0.7rem; letter-spacing: 0.15em; color: rgba(255,255,255,0.7); transition: color var(--t-base); }
.nav-menu { display: flex; align-items: center; gap: 36px; }
.nav-link { font-size: 0.95rem; font-weight: 500; color: var(--c-white); transition: color var(--t-base); position: relative; cursor: pointer; }
.nav-link::after { content: ""; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px; background: var(--c-accent); transition: width var(--t-base); }
.nav-link:hover::after { width: 100%; }
#navbar.scrolled .nav-link { color: var(--c-text); }
#navbar.scrolled .nav-link:hover { color: var(--c-primary); }
.nav-cta { background: linear-gradient(135deg,var(--c-primary),var(--c-secondary)); color: var(--c-white) !important; padding: 10px 24px; border-radius: 30px; font-size: 0.9rem; font-weight: 600; transition: all var(--t-base); box-shadow: 0 4px 16px rgba(10,77,140,0.3); }
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(10,77,140,0.4); }
.nav-cta::after { display: none; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 6px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--c-text); transition: all var(--t-base); border-radius: 2px; }
.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* === HERO === */
#hero { position: relative; min-height: 100vh; display: flex; align-items: center; justify-content: center; overflow: hidden; background: linear-gradient(165deg,var(--c-deep) 0%,var(--c-primary) 50%,var(--c-secondary) 100%); }
/* 真实摄影背景层：慢速缩放（Ken Burns）增强质感，GPU 合成，图片未加载前露出渐变底色 */
#hero::before { content: ""; position: absolute; inset: -6%; z-index: 0; background-image: url("../img/hero/hero-bg.jpg"); background-size: cover; background-position: center; animation: hero-zoom 26s ease-in-out infinite alternate; will-change: transform; }
/* 深蓝渐变压暗层：保证顶部导航与居中文案在照片上的可读性 */
#hero::after { content: ""; position: absolute; inset: 0; z-index: 1; background: linear-gradient(to bottom, rgba(5,32,63,0.62) 0%, rgba(5,32,63,0.16) 30%, rgba(5,32,63,0.30) 55%, rgba(5,32,63,0.74) 100%); }
@keyframes hero-zoom { from { transform: scale(1); } to { transform: scale(1.06); } }
@media (prefers-reduced-motion: reduce) { #hero::before { animation: none; } }
.hero-content { position: relative; z-index: 10; text-align: center; padding: 0 24px; max-width: 900px; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; background: rgba(255,255,255,0.1); backdrop-filter: blur(10px); border: 1px solid rgba(255,255,255,0.2); border-radius: 30px; padding: 8px 20px; color: var(--c-foam); font-size: 0.85rem; letter-spacing: 0.1em; margin-bottom: 32px; animation: fade-up 0.8s ease 0.2s both; }
.hero-badge .dot { width: 8px; height: 8px; background: var(--c-accent); border-radius: 50%; box-shadow: 0 0 12px var(--c-accent); animation: dot-pulse 2s ease-in-out infinite; }
@keyframes dot-pulse { 0%,100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.5; transform: scale(1.3); } }
.hero-title { font-family: var(--font-display); font-size: 4.5rem; font-weight: 700; color: var(--c-white); letter-spacing: 0.1em; margin-bottom: 8px; text-shadow: 0 4px 30px rgba(0,0,0,0.3); animation: fade-up 0.8s ease 0.4s both; }
.hero-title .gradient-text { background: linear-gradient(180deg,#ffffff 0%,var(--c-accent) 100%); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero-tagline { font-family: var(--font-display); font-size: 1.3rem; color: rgba(255,255,255,0.85); letter-spacing: 0.2em; margin-bottom: 24px; animation: fade-up 0.8s ease 0.5s both; }
.hero-desc { font-size: 1.1rem; color: rgba(255,255,255,0.75); max-width: 600px; margin: 0 auto 40px; line-height: 1.8; animation: fade-up 0.8s ease 0.6s both; }
.hero-actions { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; animation: fade-up 0.8s ease 0.7s both; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 36px; border-radius: 30px; font-size: 1rem; font-weight: 600; cursor: pointer; border: none; transition: all var(--t-base); font-family: var(--font-sans); }
.btn-primary { background: linear-gradient(135deg,var(--c-accent),var(--c-secondary)); color: var(--c-white); box-shadow: 0 8px 32px rgba(0,212,255,0.35); }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 12px 40px rgba(0,212,255,0.5); }
.btn-outline { background: transparent; color: var(--c-white); border: 2px solid rgba(255,255,255,0.4); }
.btn-outline:hover { border-color: var(--c-accent); background: rgba(0,212,255,0.1); transform: translateY(-3px); }
.btn svg, .btn i { width: 18px; height: 18px; }
.scroll-indicator { position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%); z-index: 10; color: rgba(255,255,255,0.6); display: flex; flex-direction: column; align-items: center; gap: 8px; font-size: 0.8rem; letter-spacing: 0.2em; animation: fade-in 1s ease 1s both; cursor: pointer; }
.scroll-indicator .mouse { width: 26px; height: 42px; border: 2px solid rgba(255,255,255,0.4); border-radius: 13px; position: relative; }
.scroll-indicator .mouse::before { content: ""; position: absolute; top: 8px; left: 50%; transform: translateX(-50%); width: 4px; height: 8px; background: var(--c-accent); border-radius: 2px; animation: scroll-wheel 1.5s ease infinite; }
@keyframes scroll-wheel { 0% { opacity: 1; top: 8px; } 100% { opacity: 0; top: 22px; } }
.hero-wave { position: absolute; bottom: -2px; left: 0; width: 100%; z-index: 5; line-height: 0; }
.hero-wave svg { width: 100%; height: 120px; display: block; }
/* === ABOUT === */
#about { padding: var(--section-padding); background: var(--c-white); position: relative; overflow: hidden; }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-text h2 { font-family: var(--font-display); font-size: 2.4rem; color: var(--c-text); margin-bottom: 20px; font-weight: 700; }
.about-text .accent { color: var(--c-primary); }
.about-text .lead { font-size: 1.15rem; color: var(--c-text-light); margin-bottom: 24px; line-height: 1.9; }
.about-text p { color: var(--c-text-light); margin-bottom: 16px; line-height: 1.9; }
.about-features { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 32px; }
.about-feature { display: flex; align-items: center; gap: 12px; padding: 14px 20px; background: var(--c-mist); border-radius: var(--radius-sm); transition: all var(--t-base); }
.about-feature:hover { background: var(--c-foam); transform: translateX(4px); }
.about-feature .icon-circle { width: 36px; height: 36px; background: linear-gradient(135deg,var(--c-primary),var(--c-secondary)); border-radius: 50%; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.about-feature .icon-circle svg { width: 18px; height: 18px; fill: var(--c-white); }
.about-feature span { font-size: 0.95rem; font-weight: 500; color: var(--c-text); }
.about-visual { position: relative; }
.about-card { background: linear-gradient(135deg,var(--c-deep),var(--c-primary)); border-radius: var(--radius-lg); padding: 48px; color: var(--c-white); position: relative; overflow: hidden; box-shadow: var(--shadow-lg); }
.about-card::before { content: ""; position: absolute; top: -50%; right: -50%; width: 200%; height: 200%; background: radial-gradient(circle,rgba(0,212,255,0.15) 0%,transparent 50%); animation: card-glow 6s ease-in-out infinite; }
@keyframes card-glow { 0%,100% { transform: translate(0,0); } 50% { transform: translate(-10%,10%); } }
.about-card .card-badge { display: inline-block; background: rgba(0,212,255,0.2); border: 1px solid rgba(0,212,255,0.4); color: var(--c-accent); padding: 6px 16px; border-radius: 20px; font-size: 0.8rem; margin-bottom: 20px; position: relative; z-index: 1; }
.about-card h3 { font-family: var(--font-display); font-size: 1.8rem; margin-bottom: 16px; position: relative; z-index: 1; }
.about-card p { color: rgba(255,255,255,0.8); line-height: 1.9; position: relative; z-index: 1; }
.about-card .stat-row { display: flex; gap: 32px; margin-top: 32px; position: relative; z-index: 1; }
.about-card .stat-item .num { font-family: var(--font-display); font-size: 2.2rem; font-weight: 700; color: var(--c-accent); }
.about-card .stat-item .label { font-size: 0.85rem; color: rgba(255,255,255,0.6); margin-top: 4px; }

/* === ADVANTAGES === */
#advantages { padding: var(--section-padding); background: linear-gradient(180deg,var(--c-foam) 0%,var(--c-mist) 100%); position: relative; }
.advantages-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 24px; }
.advantage-card { text-align: center; padding: 40px 24px; background: var(--c-white); border-radius: var(--radius); box-shadow: var(--shadow-sm); transition: all var(--t-base); position: relative; overflow: hidden; border: 1px solid var(--c-border); }
.advantage-card::before { content: ""; position: absolute; top: 0; left: 0; width: 100%; height: 4px; background: linear-gradient(90deg,var(--c-primary),var(--c-accent)); transform: scaleX(0); transition: transform var(--t-base); transform-origin: left; }
.advantage-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); border-color: transparent; }
.advantage-card:hover::before { transform: scaleX(1); }
.advantage-icon { width: 72px; height: 72px; margin: 0 auto 20px; background: linear-gradient(135deg,var(--c-mist),var(--c-foam)); border-radius: 50%; display: flex; align-items: center; justify-content: center; transition: all var(--t-base); }
.advantage-card:hover .advantage-icon { background: linear-gradient(135deg,var(--c-primary),var(--c-secondary)); transform: scale(1.1) rotate(5deg); }
.advantage-icon svg { width: 32px; height: 32px; fill: var(--c-primary); transition: fill var(--t-base); }
.advantage-card:hover .advantage-icon svg { fill: var(--c-white); }
.advantage-card h3 { font-family: var(--font-display); font-size: 1.25rem; color: var(--c-text); margin-bottom: 12px; font-weight: 600; }
.advantage-card p { font-size: 0.9rem; color: var(--c-text-light); line-height: 1.7; }
.advantage-num { position: absolute; top: 16px; right: 20px; font-family: var(--font-display); font-size: 3rem; font-weight: 700; color: var(--c-mist); line-height: 1; transition: color var(--t-base); }
.advantage-card:hover .advantage-num { color: rgba(0,212,255,0.15); }

/* === PRODUCTS === */
#products { padding: var(--section-padding); background: var(--c-white); position: relative; }
.products-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 30px; }
.product-card { background: var(--c-white); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); transition: all var(--t-base); border: 1px solid var(--c-border); position: relative; }
.product-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); border-color: var(--c-secondary); }
.product-image { width: 100%; height: 280px; background: linear-gradient(135deg,var(--c-mist),var(--c-foam)); display: flex; align-items: center; justify-content: center; position: relative; overflow: hidden; }
.product-image::before { content: ""; position: absolute; inset: 0; background: radial-gradient(circle at center,rgba(0,212,255,0.08) 0%,transparent 70%); }
.product-image img { max-height: 240px; max-width: 80%; object-fit: contain; z-index: 1; transition: transform var(--t-slow); }
.product-card:hover .product-image img { transform: scale(1.08); }
.product-tag { position: absolute; top: 12px; left: 12px; background: linear-gradient(135deg,var(--c-primary),var(--c-secondary)); color: var(--c-white); padding: 4px 12px; border-radius: 20px; font-size: 0.75rem; font-weight: 600; z-index: 2; box-shadow: 0 2px 8px rgba(10,77,140,0.3); }
.product-info { padding: 24px; }
.product-name { font-family: var(--font-display); font-size: 1.3rem; color: var(--c-text); font-weight: 600; margin-bottom: 8px; }
.product-source { font-size: 0.85rem; color: var(--c-text-muted); margin-bottom: 8px; }
.product-spec { font-size: 0.9rem; color: var(--c-text-light); margin-bottom: 16px; padding-bottom: 16px; border-bottom: 1px solid var(--c-border); }
.product-price { display: flex; align-items: baseline; gap: 12px; }
.price-market { font-size: 0.9rem; color: var(--c-text-muted); text-decoration: line-through; }
.price-promo { font-family: var(--font-display); font-size: 1.6rem; font-weight: 700; color: var(--c-primary); }
.price-promo .unit { font-size: 0.85rem; font-weight: 400; color: var(--c-text-light); }
.product-badge-discount { position: absolute; top: 12px; right: 12px; background: var(--c-danger); color: var(--c-white); width: 44px; height: 44px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 0.75rem; font-weight: 700; z-index: 2; box-shadow: 0 4px 12px rgba(231,76,60,0.3); transform: rotate(15deg); }
/* 产品卡片下单按钮：水滴形，与品牌主色呼应 */
.btn-order { display: inline-flex; align-items: center; justify-content: center; gap: 6px; width: 100%; margin-top: 18px; padding: 11px 20px; border: none; border-radius: 24px; background: linear-gradient(135deg,var(--c-primary),var(--c-secondary)); color: var(--c-white); font-family: var(--font-sans); font-size: 0.92rem; font-weight: 600; letter-spacing: 0.08em; cursor: pointer; box-shadow: 0 4px 14px rgba(10,77,140,0.22); transition: all var(--t-base); }
.btn-order:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(10,77,140,0.35); background: linear-gradient(135deg,var(--c-secondary),var(--c-accent)); }
.btn-order:active { transform: translateY(0); }
.btn-order svg { width: 15px; height: 15px; fill: var(--c-white); }
/* === PRICING === */
#pricing { padding: var(--section-padding); background: linear-gradient(180deg,var(--c-foam) 0%,var(--c-mist) 100%); position: relative; }
.pricing-tabs { display: flex; justify-content: center; gap: 8px; margin-bottom: 48px; background: var(--c-white); padding: 6px; border-radius: 30px; box-shadow: var(--shadow-sm); max-width: 420px; margin-left: auto; margin-right: auto; }
.pricing-tab { flex: 1; padding: 12px 28px; border-radius: 24px; font-size: 0.95rem; font-weight: 600; cursor: pointer; transition: all var(--t-base); border: none; background: transparent; color: var(--c-text-light); font-family: var(--font-sans); }
.pricing-tab.active { background: linear-gradient(135deg,var(--c-primary),var(--c-secondary)); color: var(--c-white); box-shadow: 0 4px 16px rgba(10,77,140,0.25); }
.pricing-panel { display: none; animation: fade-up 0.5s ease; }
.pricing-panel.active { display: block; }
.pricing-section-title { text-align: center; margin-bottom: 32px; }
.pricing-section-title h3 { font-family: var(--font-display); font-size: 1.6rem; color: var(--c-text); margin-bottom: 8px; }
.pricing-section-title p { color: var(--c-text-light); font-size: 0.95rem; }
.retail-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; margin-bottom: 48px; }
.retail-card { background: var(--c-white); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow-sm); transition: all var(--t-base); border: 1px solid var(--c-border); text-align: center; }
.retail-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: var(--c-secondary); }
.retail-card .product-img-sm { width: 100%; height: 160px; object-fit: contain; margin-bottom: 16px; }
.retail-card h4 { font-family: var(--font-display); font-size: 1.15rem; color: var(--c-text); margin-bottom: 6px; }
.retail-card .spec { font-size: 0.85rem; color: var(--c-text-muted); margin-bottom: 12px; }
.retail-card .source { font-size: 0.82rem; color: var(--c-text-light); margin-bottom: 16px; min-height: 20px; }
.retail-card .price-row { display: flex; align-items: baseline; justify-content: center; gap: 10px; padding-top: 12px; border-top: 1px solid var(--c-border); }
.retail-card .price-old { font-size: 0.9rem; color: var(--c-text-muted); text-decoration: line-through; }
.retail-card .price-new { font-family: var(--font-display); font-size: 1.5rem; font-weight: 700; color: var(--c-primary); }
.retail-card .price-new .unit { font-size: 0.8rem; font-weight: 400; }
.recharge-main { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 48px; }
.recharge-card { background: var(--c-white); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-md); transition: all var(--t-base); border: 1px solid var(--c-border); }
.recharge-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.recharge-card.featured { border: 2px solid var(--c-accent); position: relative; }
.recharge-card.featured::before { content: "推荐"; position: absolute; top: 16px; right: -30px; background: var(--c-accent); color: var(--c-white); padding: 4px 40px; font-size: 0.8rem; font-weight: 600; transform: rotate(45deg); z-index: 1; }
.recharge-header { background: linear-gradient(135deg,var(--c-primary),var(--c-secondary)); padding: 24px; color: var(--c-white); display: flex; align-items: center; gap: 16px; }
.recharge-header img { width: 60px; height: 60px; object-fit: contain; background: rgba(255,255,255,0.15); border-radius: 12px; padding: 6px; }
.recharge-header .info h4 { font-family: var(--font-display); font-size: 1.3rem; margin-bottom: 4px; }
.recharge-header .info .market-price { font-size: 0.85rem; opacity: 0.8; }
.recharge-body { padding: 24px; }
.recharge-option { display: flex; align-items: center; justify-content: space-between; padding: 16px; border-radius: var(--radius-sm); margin-bottom: 12px; transition: all var(--t-base); border: 1px solid var(--c-border); }
.recharge-option:hover { background: var(--c-mist); border-color: var(--c-secondary); }
.recharge-option:last-child { margin-bottom: 0; }
.recharge-option .opt-left { display: flex; flex-direction: column; gap: 4px; }
.recharge-option .opt-name { font-weight: 600; color: var(--c-text); font-size: 0.95rem; }
.recharge-option .opt-detail { font-size: 0.82rem; color: var(--c-text-light); }
.recharge-option .opt-right { text-align: right; }
.recharge-option .opt-price { font-family: var(--font-display); font-size: 1.4rem; font-weight: 700; color: var(--c-primary); }
.recharge-option .opt-unit { font-size: 0.78rem; color: var(--c-text-muted); }
.recharge-bonus { margin-top: 16px; padding: 12px 16px; background: var(--c-mist); border-radius: var(--radius-sm); font-size: 0.85rem; color: var(--c-primary); display: flex; align-items: center; gap: 8px; }
.recharge-bonus svg { width: 16px; height: 16px; fill: var(--c-primary); flex-shrink: 0; }
.cobrand-table { width: 100%; background: var(--c-white); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-md); border-collapse: collapse; }
.cobrand-table thead { background: linear-gradient(135deg,var(--c-primary),var(--c-secondary)); }
.cobrand-table thead th { padding: 16px 20px; text-align: left; color: var(--c-white); font-size: 0.9rem; font-weight: 600; letter-spacing: 0.05em; }
.cobrand-table tbody tr { transition: background var(--t-fast); border-bottom: 1px solid var(--c-border); }
.cobrand-table tbody tr:hover { background: var(--c-mist); }
.cobrand-table tbody tr:last-child { border-bottom: none; }
.cobrand-table td { padding: 16px 20px; font-size: 0.9rem; color: var(--c-text); }
.cobrand-table .td-brand { font-weight: 600; color: var(--c-primary); }
.cobrand-table .td-price { font-family: var(--font-display); font-weight: 700; color: var(--c-primary); }
.cobrand-table .td-note { font-size: 0.82rem; color: var(--c-text-light); }
.cobrand-table .badge-new { display: inline-block; background: var(--c-success); color: var(--c-white); padding: 2px 8px; border-radius: 10px; font-size: 0.72rem; margin-left: 6px; }

/* === WECHAT === */
#wechat { padding: var(--section-padding); background: linear-gradient(165deg,var(--c-deep) 0%,var(--c-primary) 100%); position: relative; overflow: hidden; color: var(--c-white); }
#wechat::before { content: ""; position: absolute; inset: 0; background: radial-gradient(ellipse at 30% 50%,rgba(0,212,255,0.1) 0%,transparent 50%),radial-gradient(ellipse at 70% 50%,rgba(26,140,196,0.15) 0%,transparent 50%); }
.wechat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; position: relative; z-index: 1; }
.wechat-text h2 { font-family: var(--font-display); font-size: 2.4rem; margin-bottom: 20px; }
.wechat-text .accent { color: var(--c-accent); }
.wechat-text p { color: rgba(255,255,255,0.75); margin-bottom: 16px; line-height: 1.9; font-size: 1.05rem; }
.wechat-features { margin-top: 32px; display: grid; gap: 16px; }
.wechat-feature { display: flex; align-items: center; gap: 16px; padding: 16px 20px; background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1); border-radius: var(--radius-sm); backdrop-filter: blur(10px); transition: all var(--t-base); cursor: pointer; }
.wechat-feature:hover { background: rgba(255,255,255,0.1); border-color: rgba(0,212,255,0.3); transform: translateX(6px); }
.wechat-feature .wf-icon { width: 44px; height: 44px; background: linear-gradient(135deg,var(--c-accent),var(--c-secondary)); border-radius: 12px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.wechat-feature .wf-icon svg { width: 22px; height: 22px; fill: var(--c-white); }
.wechat-feature .wf-text h4 { font-size: 1rem; margin-bottom: 4px; }
.wechat-feature .wf-text p { font-size: 0.85rem; color: rgba(255,255,255,0.6); margin: 0; }
.wechat-feature .wf-arrow { margin-left: auto; color: rgba(255,255,255,0.4); transition: all var(--t-base); }
.wechat-feature:hover .wf-arrow { color: var(--c-accent); transform: translateX(4px); }
.wechat-qr { display: flex; flex-direction: column; align-items: center; gap: 20px; }
.qr-card { background: var(--c-white); border-radius: var(--radius-lg); padding: 32px; text-align: center; box-shadow: var(--shadow-lg); transition: all var(--t-base); max-width: 340px; width: 100%; }
.qr-card:hover { transform: translateY(-6px); }
.qr-card .qr-img { width: 220px; height: 220px; margin: 0 auto 16px; border-radius: var(--radius); overflow: hidden; background: var(--c-mist); }
.qr-card .qr-img img { width: 100%; height: 100%; object-fit: cover; }
.qr-card h4 { font-family: var(--font-display); font-size: 1.2rem; color: var(--c-text); margin-bottom: 8px; }
.qr-card p { font-size: 0.85rem; color: var(--c-text-light); }
.qr-card .qr-tip { margin-top: 12px; padding: 8px 16px; background: var(--c-mist); border-radius: 20px; font-size: 0.8rem; color: var(--c-primary); }

/* === PROMISE === */
#promise { padding: var(--section-padding); background: var(--c-white); }
.promise-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 30px; }
.promise-card { text-align: center; padding: 36px 24px; border-radius: var(--radius); background: linear-gradient(180deg,var(--c-foam),var(--c-white)); border: 1px solid var(--c-border); transition: all var(--t-base); }
.promise-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.promise-card .promise-icon { width: 56px; height: 56px; margin: 0 auto 16px; }
.promise-card .promise-icon svg { width: 100%; height: 100%; fill: var(--c-primary); }
.promise-card h3 { font-family: var(--font-display); font-size: 1.15rem; color: var(--c-text); margin-bottom: 10px; }
.promise-card p { font-size: 0.9rem; color: var(--c-text-light); }

/* === CONTACT / FOOTER === */
#contact { background: var(--c-deep); color: var(--c-white); padding: 80px 0 0; }
.contact-cta { text-align: center; padding-bottom: 60px; border-bottom: 1px solid rgba(255,255,255,0.08); }
.contact-cta h2 { font-family: var(--font-display); font-size: 2.4rem; margin-bottom: 16px; }
.contact-cta .accent { color: var(--c-accent); }
.contact-cta p { color: rgba(255,255,255,0.6); font-size: 1.05rem; margin-bottom: 32px; }
.contact-phone { display: inline-flex; align-items: center; gap: 16px; background: rgba(0,212,255,0.1); border: 1px solid rgba(0,212,255,0.3); border-radius: 50px; padding: 16px 40px; transition: all var(--t-base); }
.contact-phone:hover { background: rgba(0,212,255,0.2); transform: scale(1.05); }
.contact-phone .phone-icon { width: 28px; height: 28px; fill: var(--c-accent); }
.contact-phone .phone-number { font-family: var(--font-display); font-size: 2rem; font-weight: 700; color: var(--c-accent); letter-spacing: 0.05em; }
.footer-main { padding: 60px 0; display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; }
.footer-brand .footer-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 20px; }
.footer-brand .footer-logo .logo-icon { width: 36px; height: 36px; background: linear-gradient(135deg,var(--c-accent),var(--c-primary)); border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%; display: flex; align-items: center; justify-content: center; transform: rotate(-45deg); }
.footer-brand .footer-logo .logo-icon svg { transform: rotate(45deg); width: 20px; height: 20px; fill: var(--c-white); }
.footer-brand .footer-logo .logo-text { font-family: var(--font-display); font-size: 1.4rem; font-weight: 700; }
.footer-brand p { color: rgba(255,255,255,0.5); font-size: 0.9rem; line-height: 1.8; max-width: 320px; }
.footer-col h4 { font-size: 1rem; color: var(--c-white); margin-bottom: 20px; font-weight: 600; }
.footer-col ul li { margin-bottom: 12px; }
.footer-col ul li a { color: rgba(255,255,255,0.5); font-size: 0.88rem; transition: color var(--t-fast); cursor: pointer; }
.footer-col ul li a:hover { color: var(--c-accent); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding: 24px 0; text-align: center; }
.footer-bottom p { color: rgba(255,255,255,0.4); font-size: 0.82rem; }
.footer-bottom .icp { margin-top: 4px; }
.footer-bottom .photo-credit { margin-top: 6px; opacity: 0.72; }
.footer-bottom a { color: inherit; text-decoration: underline; text-underline-offset: 3px; }

/* === FLOATING BUTTONS === */
.float-actions { position: fixed; right: 24px; bottom: 24px; z-index: 900; display: flex; flex-direction: column; gap: 12px; }
.float-btn { width: 56px; height: 56px; border-radius: 50%; display: flex; align-items: center; justify-content: center; cursor: pointer; border: none; transition: all var(--t-base); box-shadow: var(--shadow-md); position: relative; }
.float-btn svg { width: 24px; height: 24px; }
.float-btn.phone { background: linear-gradient(135deg,var(--c-primary),var(--c-secondary)); color: var(--c-white); }
.float-btn.phone svg { fill: var(--c-white); }
.float-btn.wechat { background: #07c160; color: var(--c-white); }
.float-btn.wechat svg { fill: var(--c-white); }
.float-btn.top { background: var(--c-white); color: var(--c-primary); border: 1px solid var(--c-border); opacity: 0; visibility: hidden; transform: translateY(20px); }
.float-btn.top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.float-btn.top svg { fill: var(--c-primary); }
.float-btn:hover { transform: scale(1.1); }
.float-btn .tooltip { position: absolute; right: 68px; top: 50%; transform: translateY(-50%); background: rgba(13,27,42,0.92); color: var(--c-white); padding: 7px 14px; border-radius: 6px; font-size: 0.8rem; line-height: 1.5; text-align: center; white-space: nowrap; width: max-content; max-width: calc(100vw - 160px); opacity: 0; visibility: hidden; transition: opacity var(--t-fast), visibility var(--t-fast), right var(--t-base); pointer-events: none; z-index: 10; box-shadow: var(--shadow-md); }
.float-btn:hover .tooltip { opacity: 1; visibility: visible; right: 64px; }
.float-btn .tooltip::after { content: ""; position: absolute; right: -5px; top: 50%; transform: translateY(-50%); border-left: 5px solid var(--c-text); border-top: 5px solid transparent; border-bottom: 5px solid transparent; }

/* === MODAL === */
.modal-overlay { position: fixed; inset: 0; background: rgba(5,32,63,0.7); backdrop-filter: blur(8px); z-index: 2000; display: flex; align-items: center; justify-content: center; opacity: 0; visibility: hidden; transition: all var(--t-base); padding: 24px; }
.modal-overlay.active { opacity: 1; visibility: visible; }
.modal-content { background: var(--c-white); border-radius: var(--radius-lg); max-width: 500px; width: 100%; padding: 40px; text-align: center; transform: scale(0.9) translateY(20px); transition: transform var(--t-bounce); position: relative; max-height: 90vh; overflow-y: auto; }
.modal-overlay.active .modal-content { transform: scale(1) translateY(0); }
.modal-close { position: absolute; top: 16px; right: 16px; width: 36px; height: 36px; border-radius: 50%; background: var(--c-mist); border: none; cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: 1.2rem; color: var(--c-text-light); transition: all var(--t-fast); }
.modal-close:hover { background: var(--c-danger); color: var(--c-white); }
.modal-icon { width: 64px; height: 64px; margin: 0 auto 20px; background: #07c160; border-radius: 16px; display: flex; align-items: center; justify-content: center; }
.modal-icon svg { width: 32px; height: 32px; fill: var(--c-white); }
.modal-content h3 { font-family: var(--font-display); font-size: 1.5rem; color: var(--c-text); margin-bottom: 8px; }
.modal-content .modal-desc { color: var(--c-text-light); margin-bottom: 24px; font-size: 0.95rem; }
.modal-qr { width: 200px; height: 200px; margin: 0 auto 20px; border-radius: var(--radius); overflow: hidden; background: var(--c-mist); }
.modal-qr img { width: 100%; height: 100%; object-fit: cover; }
.modal-steps { text-align: left; margin: 20px 0; padding: 20px; background: var(--c-mist); border-radius: var(--radius-sm); }
.modal-steps li { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 12px; font-size: 0.9rem; color: var(--c-text-light); }
.modal-steps li:last-child { margin-bottom: 0; }
.modal-steps .step-num { width: 24px; height: 24px; background: var(--c-primary); color: var(--c-white); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 0.75rem; font-weight: 700; flex-shrink: 0; }
.modal-actions { display: flex; gap: 12px; margin-top: 20px; }
.modal-actions .btn { flex: 1; justify-content: center; }
.btn-wechat { background: #07c160; color: var(--c-white); }
.btn-wechat:hover { background: #06a050; }
.order-form { text-align: left; margin: 20px 0; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 0.85rem; color: var(--c-text-light); margin-bottom: 6px; font-weight: 500; }
.form-group select, .form-group input { width: 100%; padding: 12px 16px; border: 1px solid var(--c-border); border-radius: var(--radius-sm); font-size: 0.95rem; font-family: var(--font-sans); transition: all var(--t-fast); background: var(--c-white); color: var(--c-text); }
.form-group select:focus, .form-group input:focus { outline: none; border-color: var(--c-secondary); box-shadow: 0 0 0 3px rgba(26,140,196,0.1); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* === ANIMATIONS === */
.reveal { opacity: 0; transform: translateY(40px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.active { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
@keyframes fade-up { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }

/* === RESPONSIVE === */
@media (max-width: 1024px) {
    .about-grid, .wechat-grid { grid-template-columns: 1fr; gap: 40px; }
    .footer-main { grid-template-columns: 1fr 1fr; gap: 32px; }
    .footer-brand { grid-column: 1 / -1; }
    .recharge-main { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    :root { --section-padding: 60px 0; }
    .nav-menu { position: fixed; top: 0; right: -100%; width: 75%; max-width: 320px; height: 100vh; background: var(--c-white); flex-direction: column; justify-content: flex-start; padding: 80px 24px 24px; gap: 24px; transition: right var(--t-base); box-shadow: -8px 0 32px rgba(0,0,0,0.1); z-index: 999; }
    .nav-menu.active { right: 0; }
    .nav-menu .nav-link { color: var(--c-text); font-size: 1.1rem; }
    .nav-toggle { display: flex; z-index: 1001; }
    .nav-toggle span { background: var(--c-text); }
    #navbar:not(.scrolled) .nav-toggle span { background: var(--c-white); }
    .hero-title { font-size: 2.8rem; }
    .hero-tagline { font-size: 1.05rem; }
    .hero-desc { font-size: 0.95rem; }
    .hero-actions { flex-direction: column; align-items: center; }
    .hero-actions .btn { width: 100%; max-width: 280px; justify-content: center; }
    .section-title h2 { font-size: 1.8rem; }
    .advantages-grid { grid-template-columns: 1fr 1fr; }
    .products-grid { grid-template-columns: 1fr 1fr; }
    .retail-grid { grid-template-columns: 1fr; }
    .promise-grid { grid-template-columns: 1fr; }
    .about-features { grid-template-columns: 1fr; }
    .about-card { padding: 32px; }
    .about-card .stat-row { gap: 20px; }
    .contact-phone .phone-number { font-size: 1.5rem; }
    .contact-phone { padding: 12px 28px; }
    .footer-main { grid-template-columns: 1fr; }
    .cobrand-table { font-size: 0.82rem; }
    .cobrand-table th, .cobrand-table td { padding: 12px 10px; }
    .float-actions { right: 16px; bottom: 16px; }
    .float-btn { width: 48px; height: 48px; }
    #hero::before { background-image: url("../img/hero/hero-bg-mobile.jpg"); }
    .modal-content { padding: 28px 20px; }
    .form-row { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
    .hero-title { font-size: 2.2rem; }
    .advantages-grid { grid-template-columns: 1fr; }
    .products-grid { grid-template-columns: 1fr; }
    .pricing-tabs { max-width: 100%; }
    .pricing-tab { padding: 10px 16px; font-size: 0.85rem; }
    .hero-badge { font-size: 0.75rem; padding: 6px 16px; }
}