:root {
  color-scheme: light;
  --brand: #3977f3;
  --ink: #192a43;
  --line: #e3eaf2;
  --soft: #f5f8fc;
  --width: 1140px;
}

* { box-sizing: border-box; }
html { scroll-behavior: auto; scroll-padding-top: 76px; }
body { margin: 0; color: var(--ink); background: #fff; font-family: "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; font-size: 15px; line-height: 1.7; -webkit-font-smoothing: antialiased; }
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; }
img, svg { display: block; }
svg { fill: none; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; stroke-width: 1.7; }
.page-width { width: min(var(--width), calc(100% - 48px)); margin: 0 auto; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid rgba(57,119,243,.3); outline-offset: 3px; }

.site-header { position: sticky; z-index: 20; top: 0; height: 76px; border-bottom: 1px solid #e7edf4; background: #fff; }
.header-inner { width: min(var(--width), calc(100% - 48px)); height: 76px; margin: 0 auto; display: flex; align-items: center; }
.brand { flex: 0 0 auto; display: inline-flex; align-items: center; gap: 10px; }
.brand img { width: 40px; height: 40px; }
.brand span { color: #192a43; font-size: 21px; font-weight: 750; letter-spacing: -.04em; }
.desktop-nav { margin-left: 82px; display: flex; align-items: center; gap: 40px; color: #5b6a80; font-size: 14px; }
.desktop-nav a { height: 76px; display: flex; align-items: center; border-bottom: 3px solid transparent; }
.desktop-nav a.active { color: var(--brand); border-bottom-color: var(--brand); }
.desktop-nav a:hover { color: var(--brand); }
.nav-login { min-width: 110px; height: 42px; margin-left: auto; display: inline-flex; align-items: center; justify-content: center; border-radius: 8px; color: #fff; background: var(--brand); font-size: 14px; font-weight: 600; }
.nav-login:hover, .button-primary:hover { background: #2c6be1; }
.mobile-menu-toggle, .mobile-menu { display: none; }

.hero { overflow: hidden; background: radial-gradient(circle at 28% 98%, rgba(255,255,255,.9), transparent 34%), radial-gradient(circle at 90% 5%, rgba(110,153,255,.22), transparent 28%), linear-gradient(118deg, #edf5ff 0%, #f4f9ff 46%, #d8eaff 100%); }
.hero-grid { width: min(1200px, calc(100% - 48px)); height: clamp(620px, calc(100vh - 76px), 720px); display: grid; grid-template-columns: 470px minmax(0, 1fr); gap: 40px; align-items: center; }
.hero-copy { position: relative; z-index: 2; max-width: 470px; }
.hero-index { width: 310px; height: 42px; padding: 4px; display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid rgba(75,109,154,.12); border-radius: 24px; background: rgba(255,255,255,.75); box-shadow: 0 8px 24px rgba(67,107,163,.08); }
.hero-index a { display: grid; place-items: center; border-radius: 19px; color: #25364d; font-size: 14px; font-weight: 650; }
.hero-index a:hover { color: var(--brand); background: #eef5ff; }
.hero-index a.active { color: #fff; background: #17283f; }
.hero h1 { margin: 43px 0 0; color: #13233a; font-size: clamp(52px, 4.4vw, 60px); font-weight: 750; letter-spacing: -.022em; line-height: 1.17; }
.hero h1 span { color: inherit; white-space: nowrap; }
.hero-description { max-width: 455px; margin: 25px 0 0; color: #4f6480; font-size: 17px; line-height: 1.8; }
.hero-actions { display: flex; margin-top: 34px; }
.button { min-width: 232px; height: 60px; padding: 0 28px; display: inline-flex; align-items: center; justify-content: center; border: 1px solid transparent; border-radius: 10px; font-size: 15px; font-weight: 650; }
.button-primary { color: #fff; background: var(--brand); }
.hero-links { margin-top: 21px; display: flex; gap: 23px; color: #526984; font-size: 13px; }
.hero-links a::after { margin-left: 7px; color: #3977f3; content: "→"; }
.hero-links a:hover { color: #2e6fe8; }

.hero-board { align-self: stretch; min-width: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 13px; overflow: hidden; contain: layout paint; }
.board-column { min-width: 0; display: grid; gap: 13px; align-content: start; }
.board-column-a { padding-top: 62px; grid-template-rows: 164px 96px 236px 96px; }
.board-column-b { grid-template-rows: 100px 255px 100px 205px; }
.board-column-c { padding-top: 26px; grid-template-rows: 185px 96px 230px 96px; }
.board-art, .board-note { display: block; overflow: hidden; border-radius: 18px; contain: paint; box-shadow: inset 0 0 0 1px rgba(79,121,180,.08), 0 8px 20px rgba(68,111,171,.06); }
.board-art { background-color: #e8f2ff; background-image: url("/assets/iceyu-commerce-hero-v1.jpg"); background-repeat: no-repeat; background-size: 320% auto; }
.art-stock { background-position: 5% 22%; }
.art-wallet { background-position: 4% 89%; background-size: 290% auto; }
.art-delivery { background-position: 50% 57%; background-size: 270% auto; }
.art-stack { background-position: 96% 92%; background-size: 300% auto; }
.art-receipt { background-position: 96% 9%; background-size: 300% auto; }
.art-support { background-position: 96% 58%; background-size: 290% auto; }
.board-note { padding: 17px 16px; display: flex; justify-content: center; flex-direction: column; color: #52647c; background: rgba(255,255,255,.94); cursor: pointer; }
.board-note strong { color: #263a55; font-size: 14px; font-weight: 700; }
.board-note span { margin-top: 3px; font-size: 11px; line-height: 1.5; }
.board-note-blue { color: #dceaff; background: #3977f3; box-shadow: 0 10px 20px rgba(57,119,243,.12); }
.board-note-blue strong { color: #fff; }

.section { padding: 92px 0; }
.section-title { margin: 0 auto 38px; text-align: center; }
.section-title h2 { margin: 0; color: #1d3454; font-size: 36px; font-weight: 730; letter-spacing: -.025em; }
.section-title p { margin: 9px 0 0; color: #7b899c; font-size: 14px; }
.section-title-left { margin: 0; text-align: left; }

.features-section { background: #fff; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.feature-grid article { min-height: 188px; padding: 27px 25px; border: 1px solid #dfe8f2; border-radius: 14px; background: linear-gradient(145deg, #fff 55%, #f7faff 100%); scroll-margin-top: 96px; }
.feature-grid article:hover { border-color: #bfcfea; }
.feature-icon { width: 45px; height: 45px; display: grid; place-items: center; border-radius: 12px; color: #3977f3; background: #eaf2ff; }
.feature-icon svg { width: 24px; height: 24px; }.feature-icon-violet { color: #7667e9; background: #f0eeff; }.feature-icon-green { color: #2a9d76; background: #e8f8f2; }.feature-icon-cyan { color: #219abf; background: #e7f8fc; }.feature-icon-orange { color: #d98238; background: #fff1e3; }.feature-icon-indigo { color: #5b70c8; background: #edf0ff; }
.feature-grid h3 { margin: 18px 0 5px; color: #294261; font-size: 17px; font-weight: 650; }.feature-grid p { margin: 0; color: #78869a; font-size: 13px; }

.flow-section { background: var(--soft); }
.flow-list { position: relative; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); list-style: none; }
.flow-list::before { position: absolute; top: 25px; right: 11%; left: 11%; height: 1px; background: #cbd9e8; content: ""; }
.flow-list li { position: relative; z-index: 1; padding: 0 22px; text-align: center; }
.flow-list b { width: 50px; height: 50px; margin: 0 auto; display: grid; place-items: center; border: 1px solid #a9c4e8; border-radius: 50%; color: #3977f3; background: #fff; font-size: 15px; font-weight: 650; }
.flow-list h3 { margin: 17px 0 5px; color: #2b4566; font-size: 17px; }.flow-list p { margin: 0; color: #7a889b; font-size: 13px; }

.channels-section { background: #fff; }
.channels-layout { display: grid; grid-template-columns: .9fr 1.1fr; gap: 80px; align-items: center; }
.channels-copy { max-width: 490px; }.channels-copy .section-title h2 { font-size: 35px; }.channels-copy .section-title p { max-width: 450px; font-size: 15px; line-height: 1.8; }
.text-link { display: inline-flex; align-items: center; gap: 8px; margin-top: 22px; color: #3977f3; font-size: 14px; font-weight: 600; }.text-link span { font-size: 18px; }
.payment-list { display: grid; gap: 13px; }.payment-card { min-height: 100px; padding: 20px 24px; display: flex; align-items: center; gap: 16px; border: 1px solid var(--line); border-radius: 13px; background: #fff; box-shadow: 0 8px 24px rgba(49,83,128,.06); }.payment-card img { width: 50px; height: 50px; }.payment-card h3 { margin: 0; color: #294361; font-size: 17px; }.payment-card p { margin: 3px 0 0; color: #8491a2; font-size: 12px; }

.faq-section { background: var(--soft); }.faq-layout { display: grid; grid-template-columns: 310px 1fr; gap: 90px; align-items: start; }.faq-list { border-top: 1px solid #dbe4ee; }.faq-item { border-bottom: 1px solid #dbe4ee; }.faq-question { position: relative; width: 100%; padding: 20px 48px 20px 3px; border: 0; color: #2b4465; background: transparent; font-size: 15px; font-weight: 600; line-height: 1.7; text-align: left; cursor: pointer; }.faq-question:hover { color: #3977f3; }.faq-question span { position: absolute; top: 50%; right: 5px; width: 27px; height: 27px; border-radius: 50%; background: #e8eff7; transform: translateY(-50%); }.faq-question span::before, .faq-question span::after { position: absolute; top: 50%; left: 50%; width: 10px; height: 1px; background: #6d7f97; content: ""; transform: translate(-50%,-50%); }.faq-question span::after { transform: translate(-50%,-50%) rotate(90deg); }.faq-item.is-open .faq-question { color: #3977f3; }.faq-item.is-open .faq-question span::after { display: none; }.faq-answer { max-height: 0; overflow: hidden; opacity: 0; transition: max-height .24s cubic-bezier(.2,.8,.2,1), opacity .18s ease; }.faq-item.is-open .faq-answer { max-height: 120px; opacity: 1; }.faq-answer p { margin: 0 48px 0 3px; color: #74839a; font-size: 13px; line-height: 1.7; }.faq-item.is-open .faq-answer p { margin-bottom: 19px; }

.site-footer { color: #91a2b8; background: #152b4b; }.footer-main { padding: 52px 0 42px; display: grid; grid-template-columns: 2fr 1fr 1fr 1.2fr; gap: 48px; }.footer-brand a { display: inline-flex; align-items: center; gap: 10px; color: #fff; font-size: 19px; font-weight: 720; }.footer-brand img { width: 40px; height: 40px; }.footer-brand p { margin: 14px 0 0; color: #91a2b8; font-size: 12px; }.footer-column { display: flex; align-items: flex-start; flex-direction: column; }.footer-column h3 { margin: 0 0 13px; color: #fff; font-size: 14px; font-weight: 600; }.footer-column a, .footer-column span { margin: 4px 0; font-size: 12px; }.footer-column a:hover { color: #fff; }.footer-bottom { min-height: 56px; display: flex; align-items: center; border-top: 1px solid rgba(255,255,255,.1); color: #7187a3; font-size: 11px; }

@media (max-width: 1100px) {
  .desktop-nav { margin-left: 45px; gap: 25px; }.hero-grid { grid-template-columns: 420px minmax(0, 1fr); gap: 25px; }.hero h1 { font-size: 52px; }.board-note { padding-right: 12px; padding-left: 12px; }
}

@media (max-width: 900px) {
  .desktop-nav, .nav-login { display: none; }
  .mobile-menu-toggle { width: 42px; height: 42px; margin-left: auto; padding: 10px; display: block; border: 1px solid #d4dfec; border-radius: 9px; background: #fff; }
  .mobile-menu-toggle span { height: 2px; margin: 4px 0; display: block; background: #3c526d; }
  .mobile-menu { position: absolute; top: 76px; right: 0; left: 0; padding: 12px 24px 20px; border-top: 1px solid #e7edf4; background: #fff; box-shadow: 0 14px 28px rgba(38,68,108,.1); }
  .mobile-menu[hidden] { display: none; }.mobile-menu:not([hidden]) { display: block; }.mobile-menu > a { display: block; padding: 11px 0; border-bottom: 1px solid #edf1f5; color: #4a5d75; }.mobile-menu-actions { margin-top: 14px; display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }.mobile-menu-actions a { height: 43px; display: grid; place-items: center; border: 1px solid #d7e1ec; border-radius: 8px; color: #435872; }.mobile-menu-actions .mobile-register { color: #fff; border-color: var(--brand); background: var(--brand); }
  .hero { padding: 58px 0 0; }.hero-grid { width: min(720px, calc(100% - 48px)); height: auto; grid-template-columns: 1fr; gap: 48px; }.hero-copy { max-width: 610px; }.hero h1 { font-size: 60px; }.hero-board { width: 100%; height: 620px; }.feature-grid { grid-template-columns: repeat(2, 1fr); }.channels-layout { gap: 46px; }.faq-layout { grid-template-columns: 1fr; gap: 38px; }.footer-main { grid-template-columns: 1.6fr 1fr 1fr; }.footer-column:last-child { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  .page-width, .header-inner { width: calc(100% - 32px); }.site-header, .header-inner { height: 68px; }.brand { gap: 8px; }.brand img { width: 36px; height: 36px; }.brand span { font-size: 19px; }.mobile-menu { top: 68px; padding-right: 16px; padding-left: 16px; }
  .hero { padding: 40px 0 0; }.hero-grid { width: calc(100% - 32px); gap: 35px; }.hero-index { width: min(310px, 100%); height: 40px; }.hero-index a { font-size: 13px; }.hero h1 { margin-top: 32px; font-size: 45px; line-height: 1.16; }.hero-description { margin-top: 18px; font-size: 15px; }.hero-actions { margin-top: 25px; }.button { min-width: 215px; height: 52px; padding: 0 20px; font-size: 14px; }.hero-links { margin-top: 18px; gap: 15px; font-size: 12px; }
  .hero-board { height: 365px; gap: 8px; }.board-column { gap: 8px; }.board-column-a { padding-top: 36px; grid-template-rows: 88px 62px 126px 62px; }.board-column-b { grid-template-rows: 64px 136px 65px 102px; }.board-column-c { padding-top: 15px; grid-template-rows: 105px 62px 118px 62px; }.board-art, .board-note { border-radius: 12px; }.board-art { background-size: 410% auto; }.art-wallet, .art-delivery, .art-stack, .art-receipt, .art-support { background-size: 390% auto; }.board-note { padding: 9px 8px; }.board-note strong { font-size: 11px; }.board-note span { margin-top: 1px; font-size: 9px; line-height: 1.35; }
  .section { padding: 67px 0; }.section-title { margin-bottom: 28px; }.section-title h2, .channels-copy .section-title h2 { font-size: 28px; }.section-title p { font-size: 13px; }.feature-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }.feature-grid article { min-height: 158px; padding: 18px 16px; }.feature-icon { width: 40px; height: 40px; border-radius: 10px; }.feature-icon svg { width: 21px; height: 21px; }.feature-grid h3 { margin-top: 13px; font-size: 15px; }.feature-grid p { font-size: 11px; line-height: 1.65; }.flow-list { grid-template-columns: 1fr; gap: 13px; }.flow-list::before { display: none; }.flow-list li { padding: 0; display: grid; grid-template-columns: 46px 1fr; gap: 14px; align-items: center; text-align: left; }.flow-list b { grid-row: span 2; margin: 0; }.flow-list h3 { margin: 0 0 2px; }.channels-layout { grid-template-columns: 1fr; gap: 28px; }.channels-copy .section-title { margin-bottom: 0; }.payment-card { min-height: 84px; padding: 15px 17px; }.payment-card img { width: 43px; height: 43px; }.payment-card h3 { font-size: 15px; }.payment-card p { font-size: 11px; }.faq-layout { gap: 25px; }.faq-question { padding: 17px 42px 17px 2px; font-size: 14px; }.faq-answer p { margin-right: 30px; font-size: 12px; }.footer-main { padding: 43px 0 34px; grid-template-columns: 1fr 1fr; gap: 30px 20px; }.footer-brand { grid-column: 1 / -1; }.footer-column:last-child { grid-column: 1 / -1; }.footer-bottom { min-height: 48px; }
}