:root {
  --primary: #2f5fd0;
  --primary-dark: #234bb0;
  --primary-soft: #eef3ff;
  --text: #1f2733;
  --text-soft: #5a6675;
  --line: #e6eaf0;
  --bg: #f6f8fc;
  --white: #ffffff;
  --danger: #d9534f;
  --radius: 12px;
  --shadow: 0 6px 22px rgba(31, 39, 51, 0.08);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1180px, 92%); margin: 0 auto; }
.icon { width: 18px; height: 18px; flex: none; }
.module-card__icon svg, .feature__icon svg, .empty-state__icon svg, .brand__logo svg,
.footer__brand svg, .stat__icon svg, .step__icon svg, .cat__icon svg, .contact-card__icon svg { width: 100%; height: 100%; }

/* ---------- Header ---------- */
.header { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,0.96); border-bottom: 1px solid var(--line); backdrop-filter: blur(6px); }
.header__inner { display: flex; align-items: center; gap: 18px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand__logo { width: 30px; height: 30px; color: var(--primary); }
.brand__name { font-size: 19px; font-weight: 700; letter-spacing: 0.5px; }
.nav { display: flex; gap: 6px; margin-left: 14px; }
.nav__link { padding: 8px 14px; border-radius: 8px; color: var(--text-soft); font-size: 15px; transition: 0.2s; }
.nav__link:hover { color: var(--primary); background: var(--primary-soft); }
.nav__link.is-active { color: var(--primary); background: var(--primary-soft); font-weight: 600; }
.header__actions { margin-left: auto; display: flex; align-items: center; gap: 14px; }
.cart-btn { position: relative; color: var(--text); display: inline-flex; }
.cart-btn .icon { width: 22px; height: 22px; }
.cart-badge { position: absolute; top: -6px; right: -8px; background: var(--danger); color: #fff; font-size: 11px; min-width: 16px; height: 16px; line-height: 16px; text-align: center; border-radius: 9px; padding: 0 4px; }
.auth { padding: 7px 16px; border-radius: 8px; font-size: 14px; }
.auth--login { color: var(--primary); border: 1px solid var(--primary); }
.auth--reg { background: var(--primary); color: #fff; }
.auth--reg:hover { background: var(--primary-dark); }
.user { display: flex; align-items: center; gap: 12px; font-size: 14px; }
.user__name { display: inline-flex; align-items: center; gap: 6px; color: var(--text); font-weight: 600; }
.user__link { color: var(--text-soft); }
.user__link:hover { color: var(--primary); }
.burger { display: none; background: none; border: none; color: var(--text); cursor: pointer; }
.burger .icon { width: 24px; height: 24px; }

/* ---------- Hero ---------- */
.hero { background: linear-gradient(135deg, #2f5fd0 0%, #4f7be8 100%); color: #fff; padding: 56px 0; }
.hero__inner { display: flex; align-items: center; gap: 40px; flex-wrap: wrap; }
.hero__text { flex: 1 1 420px; }
.hero h1 { font-size: 34px; margin: 0 0 14px; line-height: 1.3; }
.hero p { font-size: 16px; opacity: 0.92; margin: 0 0 22px; }
.hero__btns { display: flex; gap: 14px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 26px; border-radius: 9px; font-size: 15px; font-weight: 600; cursor: pointer; border: none; transition: 0.2s; }
.btn--primary { background: #fff; color: var(--primary); }
.btn--primary:hover { background: #eef3ff; }
.btn--ghost { background: rgba(255,255,255,0.16); color: #fff; border: 1px solid rgba(255,255,255,0.5); }
.btn--ghost:hover { background: rgba(255,255,255,0.26); }
.btn--blue { background: var(--primary); color: #fff; }
.btn--blue:hover { background: var(--primary-dark); }
.btn--outline { background: transparent; color: var(--primary); border: 1px solid var(--primary); }
.btn--block { width: 100%; justify-content: center; }
.hero__card { flex: 0 0 280px; background: rgba(255,255,255,0.14); border: 1px solid rgba(255,255,255,0.3); border-radius: var(--radius); padding: 22px; }
.hero__card h3 { margin: 0 0 12px; font-size: 17px; }
.hero__card ul { margin: 0; padding-left: 18px; font-size: 14px; line-height: 2; }

/* ---------- Sections ---------- */
.section { padding: 48px 0; }
.section__head { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 26px; flex-wrap: wrap; gap: 10px; }
.section__title { font-size: 24px; margin: 0; }
.section__sub { color: var(--text-soft); margin: 6px 0 0; font-size: 14px; }
.section__more { color: var(--primary); font-size: 14px; }

/* module cards */
.module-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.module-card { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; transition: 0.2s; }
.module-card:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.module-card__icon { width: 44px; height: 44px; color: var(--primary); margin-bottom: 14px; }
.module-card h3 { margin: 0 0 8px; font-size: 18px; }
.module-card p { color: var(--text-soft); font-size: 14px; margin: 0 0 16px; }

/* stats */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.stat { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; text-align: center; }
.stat__icon { width: 34px; height: 34px; color: var(--primary); margin: 0 auto 10px; }
.stat__num { font-size: 26px; font-weight: 700; color: var(--primary); }
.stat__label { color: var(--text-soft); font-size: 14px; margin-top: 4px; }

/* features */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature { display: flex; gap: 14px; }
.feature__icon { width: 36px; height: 36px; color: var(--primary); flex: none; }
.feature h4 { margin: 0 0 6px; font-size: 16px; }
.feature p { margin: 0; color: var(--text-soft); font-size: 14px; }

/* ---------- Filters ---------- */
.filters { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 22px; align-items: center; }
.filter-btn { padding: 8px 16px; border: 1px solid var(--line); background: var(--white); border-radius: 20px; font-size: 14px; cursor: pointer; color: var(--text-soft); }
.filter-btn.is-active, .filter-btn:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); }
.search-box { margin-left: auto; display: flex; }
.search-box input { border: 1px solid var(--line); border-radius: 8px 0 0 8px; padding: 9px 14px; width: 220px; font-size: 14px; outline: none; }
.search-box button { border: 1px solid var(--primary); background: var(--primary); color: #fff; border-radius: 0 8px 8px 0; padding: 0 16px; cursor: pointer; }

/* ---------- Product grid ---------- */
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.product-card { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: 0.2s; display: flex; flex-direction: column; }
.product-card:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.product-card__img { aspect-ratio: 1/1; overflow: hidden; background: #f0f2f7; }
.product-card__img img { width: 100%; height: 100%; object-fit: cover; }
.product-card__body { padding: 14px 16px 16px; display: flex; flex-direction: column; flex: 1; }
.product-card__name { font-size: 15px; font-weight: 600; line-height: 1.5; margin: 0 0 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; min-height: 45px; }
.product-card__meta { color: var(--text-soft); font-size: 13px; margin-bottom: 10px; display: flex; gap: 10px; flex-wrap: wrap; }
.product-card__price { display: flex; align-items: baseline; gap: 8px; margin-top: auto; }
.product-card__price .now { color: var(--danger); font-size: 18px; font-weight: 700; }
.product-card__price .old { color: #9aa4b2; font-size: 13px; text-decoration: line-through; }
.product-card__merchant { font-size: 12px; color: var(--text-soft); margin-top: 8px; }

/* ---------- Product detail ---------- */
.pd { display: grid; grid-template-columns: 1fr 320px; gap: 28px; align-items: start; }
.pd__main { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.pd__top { display: grid; grid-template-columns: 380px 1fr; gap: 28px; }
.gallery__main { aspect-ratio: 1/1; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; background: #f0f2f7; }
.gallery__main img { width: 100%; height: 100%; object-fit: cover; }
.gallery__thumbs { display: flex; gap: 10px; margin-top: 12px; flex-wrap: wrap; }
.gallery__thumbs img { width: 64px; height: 64px; object-fit: cover; border: 2px solid transparent; border-radius: 8px; cursor: pointer; }
.gallery__thumbs img.is-active { border-color: var(--primary); }
.pd__buy h1 { font-size: 22px; margin: 0 0 12px; line-height: 1.4; }
.pd__price { display: flex; align-items: baseline; gap: 12px; margin-bottom: 14px; }
.pd__price .now { color: var(--danger); font-size: 28px; font-weight: 700; }
.pd__price .old { color: #9aa4b2; text-decoration: line-through; }
.pd__tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.tag { background: var(--primary-soft); color: var(--primary); font-size: 12px; padding: 4px 10px; border-radius: 6px; }
.pd__specs { margin: 0 0 18px; padding: 0; list-style: none; }
.pd__specs li { display: flex; gap: 8px; font-size: 14px; padding: 5px 0; border-bottom: 1px dashed var(--line); }
.pd__specs span:first-child { color: var(--text-soft); width: 60px; flex: none; }
.pd__qty { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.qty { display: inline-flex; align-items: center; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.qty button { width: 36px; height: 36px; border: none; background: #f3f5f9; font-size: 18px; cursor: pointer; color: var(--text); }
.qty input { width: 48px; height: 36px; border: none; text-align: center; font-size: 15px; outline: none; }
.pd__actions { display: flex; gap: 12px; }
.pd__detail { margin-top: 28px; }
.pd__detail h2 { font-size: 18px; margin: 0 0 12px; }
.pd__detail p { color: var(--text-soft); line-height: 1.9; }
.pd__publish { color: #9aa4b2; font-size: 13px; margin-top: 10px; }

/* merchant card (right column) */
.pd__aside { position: sticky; top: 84px; display: flex; flex-direction: column; gap: 18px; }
.contact-card { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.contact-card__icon { width: 40px; height: 40px; color: var(--primary); margin-bottom: 12px; }
.contact-card h3 { margin: 0 0 4px; font-size: 18px; }
.contact-card__region { color: var(--text-soft); font-size: 13px; margin-bottom: 16px; }
.contact-row { display: flex; align-items: center; gap: 10px; padding: 9px 0; border-top: 1px solid var(--line); font-size: 14px; }
.contact-row .icon { width: 18px; height: 18px; color: var(--primary); flex: none; }
.contact-row .val { color: var(--text); }
.contact-row .val.mask { letter-spacing: 1px; color: var(--text-soft); }
.contact-card__note { font-size: 12px; color: #9aa4b2; margin-top: 12px; line-height: 1.6; }
.contact-card .btn { margin-top: 14px; }

/* ---------- Cart ---------- */
.cart-layout { display: grid; grid-template-columns: 1fr 320px; gap: 24px; align-items: start; }
.cart-table { width: 100%; border-collapse: collapse; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; table-layout: fixed; }
.cart-table th, .cart-table td { padding: 15px 13px; word-break: break-word; border-bottom: 1px solid var(--line); text-align: left; font-size: 14px; }
.cart-table th { background: #f7f9fc; color: var(--text-soft); font-weight: 600; }
.cart-table td.col-item { width: 42%; }
.cart-table td.col-qty { width: 20%; }
.cart-table td.col-sub { width: 18%; }
.cart-table td.col-act { width: 20%; }
.cart-item { display: flex; gap: 12px; align-items: center; }
.cart-item img { width: 64px; height: 64px; object-fit: cover; border-radius: 8px; flex: none; }
.cart-item__name { font-size: 14px; line-height: 1.4; }
.cart-item__merchant { color: var(--text-soft); font-size: 12px; margin-top: 4px; }
.qty-sm { display: inline-flex; align-items: center; border: 1px solid var(--line); border-radius: 6px; overflow: hidden; }
.qty-sm button { width: 28px; height: 28px; border: none; background: #f3f5f9; cursor: pointer; }
.qty-sm input { width: 38px; height: 28px; border: none; text-align: center; outline: none; }
.link-danger { color: var(--danger); font-size: 13px; cursor: pointer; background: none; border: none; }
.cart-summary { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; position: sticky; top: 84px; }
.cart-summary h3 { margin: 0 0 14px; font-size: 17px; }
.cart-summary__row { display: flex; justify-content: space-between; padding: 8px 0; font-size: 14px; color: var(--text-soft); }
.cart-summary__total { display: flex; justify-content: space-between; padding: 14px 0 4px; font-size: 16px; border-top: 1px solid var(--line); margin-top: 6px; }
.cart-summary__total .now { color: var(--danger); font-weight: 700; font-size: 22px; }

/* ---------- Forms / Auth ---------- */
.form-wrap { max-width: 440px; margin: 0 auto; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow); }
.form-wrap h2 { margin: 0 0 6px; font-size: 22px; }
.form-wrap .form-sub { color: var(--text-soft); font-size: 14px; margin: 0 0 22px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 14px; margin-bottom: 7px; color: var(--text); }
.field input, .field select, .field textarea { width: 100%; padding: 11px 14px; border: 1px solid var(--line); border-radius: 8px; font-size: 14px; outline: none; font-family: inherit; }
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--primary); }
.field textarea { resize: vertical; min-height: 90px; }
.check-row { display: flex; align-items: flex-start; gap: 8px; font-size: 13px; color: var(--text-soft); margin: 4px 0 18px; }
.check-row input { margin-top: 3px; }
.check-row a { color: var(--primary); }
.form-switch { text-align: center; margin-top: 18px; font-size: 14px; color: var(--text-soft); }
.form-switch a { color: var(--primary); }
.form-msg { font-size: 13px; margin: -6px 0 12px; min-height: 18px; }
.form-msg.err { color: var(--danger); }
.form-msg.ok { color: #2e9e5b; }
.field-hint { font-size: 12px; color: #9aa4b2; margin-top: 4px; }

/* ---------- Merchant apply steps ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 30px; }
.step { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; text-align: center; }
.step__icon { width: 36px; height: 36px; color: var(--primary); margin: 0 auto 10px; }
.step h4 { margin: 0 0 6px; font-size: 15px; }
.step p { margin: 0; color: var(--text-soft); font-size: 13px; }
.merchant-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 30px; }
.merchant-card { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.merchant-card__head { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.merchant-card__logo { width: 46px; height: 46px; border-radius: 10px; background: var(--primary-soft); color: var(--primary); display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 18px; }
.merchant-card h3 { margin: 0; font-size: 17px; }
.merchant-card__region { color: var(--text-soft); font-size: 13px; }
.merchant-card__row { display: flex; gap: 8px; font-size: 13px; color: var(--text-soft); padding: 5px 0; }
.merchant-card__row .icon { width: 16px; height: 16px; color: var(--primary); }

/* ---------- About ---------- */
.about-hero { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 40px; margin-bottom: 24px; }
.about-hero h1 { margin: 0 0 10px; font-size: 28px; }
.about-hero .lead { color: var(--text-soft); font-size: 15px; }
.about-meta { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin: 26px 0; }
.about-meta .item { background: var(--bg); border-radius: var(--radius); padding: 18px; }
.about-meta .item .k { color: var(--text-soft); font-size: 13px; }
.about-meta .item .v { font-size: 16px; font-weight: 600; margin-top: 4px; }
.about-block { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; margin-bottom: 20px; }
.about-block h2 { margin: 0 0 12px; font-size: 20px; }
.about-block p { color: var(--text-soft); line-height: 1.9; }
.about-block ul { color: var(--text-soft); line-height: 2; }

/* ---------- Empty / alert ---------- */
.empty-state { text-align: center; padding: 60px 20px; color: var(--text-soft); }
.empty-state__icon { width: 56px; height: 56px; color: #c2cbd8; margin: 0 auto 14px; }
.alert { background: var(--primary-soft); border: 1px solid #cdd9f7; color: var(--primary-dark); padding: 14px 18px; border-radius: 10px; font-size: 14px; }

/* ---------- Footer ---------- */
.footer { background: #1f2733; color: #c9d2de; margin-top: 50px; }
.footer__inner { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.4fr; gap: 30px; padding: 44px 0 30px; }
.footer__brand { display: flex; align-items: center; gap: 8px; color: #fff; font-size: 18px; font-weight: 700; margin-bottom: 12px; }
.footer__brand svg { width: 24px; height: 24px; color: var(--primary); }
.footer__col a { display: block; color: #aeb9c6; font-size: 14px; padding: 4px 0; }
.footer__col a:hover { color: #fff; }
.footer__title { color: #fff; font-size: 15px; margin: 0 0 12px; }
.footer__line { font-size: 14px; margin: 4px 0; }
.footer__bottom { border-top: 1px solid #2c3744; padding: 16px 0; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; font-size: 13px; color: #8b97a6; }
.footer__beian { color: #8b97a6; }
.footer__beian:hover { color: #fff; }

/* ---------- Responsive ---------- */
@media (max-width: 920px) {
  .module-grid, .feature-grid, .product-grid, .stats, .merchant-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .about-meta { grid-template-columns: 1fr; }
  .pd, .cart-layout { grid-template-columns: 1fr; }
  .pd__aside { position: static; }
  .pd__top { grid-template-columns: 1fr; }
  .footer__inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 680px) {
  .nav { display: none; position: absolute; top: 64px; left: 0; right: 0; background: #fff; flex-direction: column; padding: 10px 4%; border-bottom: 1px solid var(--line); box-shadow: var(--shadow); }
  .nav.is-open { display: flex; }
  .burger { display: inline-flex; }
  .header__actions .auth { padding: 6px 12px; }
  .module-grid, .feature-grid, .product-grid, .stats, .merchant-grid, .steps { grid-template-columns: 1fr; }
  .hero h1 { font-size: 26px; }
  .footer__inner { grid-template-columns: 1fr; }
  .search-box input { width: 140px; }
}