/* ============================================================
   VOLT — 电子设备商店样品站
   纯静态，无依赖，无外部资源
   ============================================================ */

:root {
  --ink: #1b1b1f;
  --ink-2: #4a4a55;
  --ink-3: #787885;
  --line: #e4e4ea;
  --line-2: #d0d0d8;
  --bg: #ffffff;
  --bg-2: #f7f7f9;
  --bg-3: #f1f1f5;
  --accent: #e23e57;
  --accent-dark: #c22e45;
  --accent-soft: #fdecef;
  --green: #1f8a5b;
  --green-soft: #e8f6ef;
  --danger: #c22e45;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow-sm: 0 1px 2px rgba(27, 27, 31, .05);
  --shadow: 0 8px 24px rgba(27, 27, 31, .07);
  --shadow-lg: 0 24px 60px rgba(27, 27, 31, .12);
  --max: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }
button { font: inherit; cursor: pointer; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ---------------- 页眉 ---------------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap {
  display: flex; align-items: center; gap: 30px; height: 70px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; letter-spacing: -.4px; }
.brand-mark {
  width: 32px; height: 32px; border-radius: 9px;
  background: var(--accent);
  display: grid; place-items: center; color: #fff;
  font-size: 17px; font-weight: 900; letter-spacing: -.5px;
  box-shadow: 0 6px 16px rgba(226, 62, 87, .28);
}
.nav { display: flex; align-items: center; gap: 26px; margin-left: auto; font-size: 15px; color: var(--ink-2); }
.nav a:hover { color: var(--ink); }
.nav a.active { color: var(--ink); font-weight: 650; }

.cart-btn {
  position: relative; display: inline-flex; align-items: center; gap: 7px;
  padding: 9px 16px; border-radius: 999px;
  border: 1px solid var(--line-2); background: #fff;
  font-size: 14.5px; font-weight: 650; color: var(--ink);
  transition: .16s;
}
.cart-btn:hover { border-color: var(--ink-3); text-decoration: none; }
.cart-count {
  min-width: 19px; height: 19px; padding: 0 5px; border-radius: 999px;
  background: var(--accent); color: #fff;
  font-size: 11.5px; font-weight: 800; line-height: 19px; text-align: center;
}
.cart-count[data-empty="1"] { background: var(--line-2); color: var(--ink-3); }

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border-radius: var(--radius-sm);
  border: 1px solid var(--line-2); background: #fff; color: var(--ink);
  font-size: 15px; font-weight: 650; transition: .16s; white-space: nowrap;
}
.btn:hover { border-color: var(--ink-3); transform: translateY(-1px); text-decoration: none; }
.btn-primary {
  background: var(--ink); border-color: var(--ink); color: #fff;
  box-shadow: 0 10px 24px rgba(13, 17, 23, .18);
}
.btn-primary:hover { background: #1b2230; border-color: #1b2230; color: #fff; }
.btn-accent { background: var(--accent); border-color: var(--accent); color: #fff; box-shadow: 0 10px 24px rgba(226, 62, 87, .26); }
.btn-accent:hover { background: var(--accent-dark); border-color: var(--accent-dark); color: #fff; }
.btn-block { width: 100%; }
.btn-sm { padding: 9px 16px; font-size: 14px; }

/* ---------------- Hero ---------------- */
.hero {
  position: relative; overflow: hidden;
  background: radial-gradient(70% 90% at 78% 8%, rgba(226, 62, 87, .12) 0%, rgba(226, 62, 87, 0) 62%),
              radial-gradient(50% 70% at 12% 90%, rgba(31, 138, 91, .10) 0%, rgba(31, 138, 91, 0) 65%),
              var(--bg-2);
  border-bottom: 1px solid var(--line);
}
.hero-inner {
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center;
  padding: 84px 0 92px;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 13px; border-radius: 999px;
  background: #fff; border: 1px solid var(--line-2);
  font-size: 13px; font-weight: 650; color: var(--ink-2);
  box-shadow: var(--shadow-sm);
}
.eyebrow i { width: 6px; height: 6px; border-radius: 50%; background: var(--green); }
.hero h1 {
  margin: 20px 0 16px; font-size: 56px; line-height: 1.06;
  letter-spacing: -1.8px; font-weight: 820;
}
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p.lede { margin: 0 0 30px; font-size: 17.5px; color: var(--ink-2); max-width: 46ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-meta { display: flex; gap: 30px; margin-top: 38px; flex-wrap: wrap; }
.hero-meta div b { display: block; font-size: 22px; letter-spacing: -.6px; }
.hero-meta div span { font-size: 13px; color: var(--ink-3); }

.hero-art {
  position: relative; border-radius: 22px; overflow: hidden;
  background: linear-gradient(160deg, #10151f 0%, #1c2433 100%);
  box-shadow: 0 30px 80px rgba(13, 17, 23, .28), 0 0 0 1px rgba(255, 255, 255, .06) inset;
  aspect-ratio: 1 / 1;
  display: grid; place-items: center;
}
.hero-art img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  transition: transform .8s cubic-bezier(.2, .7, .3, 1);
}
.hero-art:hover img { transform: scale(1.03); }

/* ---------------- 通用区块 ---------------- */
section.band { padding: 76px 0; }
section.band.alt { background: var(--bg-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.sec-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin-bottom: 34px; flex-wrap: wrap; }
.sec-head h2 { margin: 0; font-size: 33px; letter-spacing: -1px; font-weight: 800; }
.sec-head p { margin: 8px 0 0; color: var(--ink-3); font-size: 15.5px; }

/* ---------------- 分类 ---------------- */
.cats { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
.cat {
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  padding: 22px 12px; border-radius: var(--radius);
  border: 1px solid var(--line); background: #fff;
  transition: .16s; text-align: center;
}
.cat:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow); text-decoration: none; }
.cat svg { width: 34px; height: 34px; color: var(--accent); }
.cat img {
  width: 52px; height: 52px; border-radius: 10px; object-fit: cover;
  box-shadow: 0 4px 12px rgba(13, 17, 23, .10);
  transition: transform .25s;
}
.cat:hover img { transform: scale(1.06); }
.cat span { font-size: 14px; font-weight: 650; }

/* ---------------- 商品卡 ---------------- */
.grid-products { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.card {
  display: flex; flex-direction: column;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: #fff; overflow: hidden; transition: .18s;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 40px rgba(13, 17, 23, .10);
  border-color: var(--line-2);
}
.card-art {
  position: relative; aspect-ratio: 1 / 1;
  background: #eef1f6;
  display: grid; place-items: center; overflow: hidden;
}
.card-art svg { width: 52%; height: auto; }
.card-art img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  transition: transform .5s cubic-bezier(.2, .7, .3, 1);
}
.card:hover .card-art img { transform: scale(1.05); }
.card-art::after {
  content: ""; position: absolute; inset: auto 0 0 0; height: 42%;
  background: linear-gradient(to top, rgba(13, 17, 23, .07), rgba(13, 17, 23, 0));
  pointer-events: none; opacity: 0; transition: opacity .3s;
}
.card:hover .card-art::after { opacity: 1; }
.badge {
  position: absolute; top: 11px; left: 11px;
  padding: 4px 9px; border-radius: 7px;
  font-size: 11.5px; font-weight: 800; letter-spacing: .3px;
  background: var(--ink); color: #fff;
}
.badge.new { background: var(--green-soft); color: var(--green); }
.badge.sale { background: var(--danger); }
.card-body { padding: 15px 16px 17px; display: flex; flex-direction: column; gap: 5px; flex: 1; }
.card-body h3 { margin: 0; font-size: 15.5px; letter-spacing: -.2px; }
.card-body .sub { font-size: 12.5px; color: var(--ink-3); }
.card-foot { margin-top: auto; padding-top: 12px; display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.price { font-size: 17px; font-weight: 800; letter-spacing: -.3px; }
.price s { font-size: 12.5px; font-weight: 500; color: var(--ink-3); margin-left: 5px; }

/* ---------------- 特性 ---------------- */
.feats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feat {
  padding: 26px 24px; border-radius: var(--radius);
  border: 1px solid var(--line); background: #fff;
}
.feat .ico {
  width: 42px; height: 42px; border-radius: var(--radius-sm); display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent); margin-bottom: 15px;
}
.feat .ico svg { width: 21px; height: 21px; }
.feat h3 { margin: 0 0 7px; font-size: 16.5px; letter-spacing: -.2px; }
.feat p { margin: 0; font-size: 14.5px; color: var(--ink-2); }

/* ---------------- 商品详情 ---------------- */
.pd { display: grid; grid-template-columns: 1fr 1fr; gap: 54px; padding: 52px 0 20px; align-items: start; }
.pd-art {
  border-radius: 20px; aspect-ratio: 1 / 1; display: grid; place-items: center;
  background: #eef1f6; border: 1px solid var(--line); overflow: hidden;
}
.pd-art svg { width: 62%; }
.pd-art img { width: 100%; height: 100%; object-fit: cover; display: block; }
.pd h1 { margin: 10px 0 10px; font-size: 36px; letter-spacing: -1.1px; font-weight: 800; }
.pd .pd-price { font-size: 30px; font-weight: 820; letter-spacing: -.8px; margin: 16px 0 4px; }
.pd .pd-price s { font-size: 16px; font-weight: 500; color: var(--ink-3); margin-left: 8px; }
.pd .pd-desc { color: var(--ink-2); font-size: 15.5px; margin: 14px 0 22px; }
.pd-actions { display: flex; gap: 12px; margin: 22px 0 26px; flex-wrap: wrap; }
.specs { border-top: 1px solid var(--line); margin-top: 6px; }
.specs div { display: flex; justify-content: space-between; gap: 20px; padding: 11px 0; border-bottom: 1px solid var(--line); font-size: 14.5px; }
.specs dt { color: var(--ink-3); }
.specs dd { margin: 0; font-weight: 600; text-align: right; }

/* ---------------- 购物车 ---------------- */
.cart-layout { display: grid; grid-template-columns: 1.6fr .9fr; gap: 34px; padding: 46px 0 80px; align-items: start; }
.cart-row {
  display: grid; grid-template-columns: 92px 1fr auto auto; gap: 16px; align-items: center;
  padding: 16px; border: 1px solid var(--line); border-radius: var(--radius);
  background: #fff; margin-bottom: 12px;
}
.cart-row .thumb {
  width: 92px; height: 92px; border-radius: var(--radius-sm); display: grid; place-items: center;
  background: #eef1f6; overflow: hidden;
}
.cart-row .thumb svg { width: 62%; }
.cart-row .thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.cart-row h4 { margin: 0 0 3px; font-size: 15px; }
.cart-row .sub { font-size: 12.5px; color: var(--ink-3); }
.qty { display: inline-flex; align-items: center; border: 1px solid var(--line-2); border-radius: 9px; overflow: hidden; }
.qty button { width: 32px; height: 32px; border: 0; background: #fff; font-size: 16px; color: var(--ink-2); }
.qty button:hover { background: var(--bg-2); }
.qty span { min-width: 34px; text-align: center; font-size: 14px; font-weight: 700; }
.link-danger { border: 0; background: none; color: var(--ink-3); font-size: 13px; text-decoration: underline; }
.link-danger:hover { color: var(--danger); }

.summary {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; background: #fff; position: sticky; top: 92px;
}
.summary h3 { margin: 0 0 16px; font-size: 17px; }
.summary .line { display: flex; justify-content: space-between; padding: 8px 0; font-size: 14.5px; color: var(--ink-2); }
.summary .total { display: flex; justify-content: space-between; padding: 15px 0 4px; margin-top: 8px; border-top: 1px solid var(--line); font-size: 18px; font-weight: 800; }
.empty { text-align: center; padding: 70px 20px; color: var(--ink-3); }
.empty svg { width: 54px; height: 54px; margin: 0 auto 16px; color: var(--line-2); }

/* ---------------- 页脚 ---------------- */
.site-footer { border-top: 1px solid var(--line); background: var(--bg-2); padding: 56px 0 34px; }
.foot-cols { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 40px; }
.foot-cols h4 { margin: 0 0 12px; font-size: 13px; text-transform: uppercase; letter-spacing: .7px; color: var(--ink-3); }
.foot-cols a { display: block; margin-bottom: 8px; font-size: 14.5px; color: var(--ink-2); }
.foot-cols a:hover { color: var(--ink); }
.foot-brand p { margin: 12px 0 0; font-size: 14px; color: var(--ink-3); max-width: 34ch; }
.foot-bottom { margin-top: 40px; padding-top: 22px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 13px; color: var(--ink-3); }

/* ---------------- 提示 ---------------- */
.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translate(-50%, 20px);
  background: var(--ink); color: #fff; padding: 12px 20px; border-radius: var(--radius-sm);
  font-size: 14.5px; font-weight: 600; box-shadow: var(--shadow-lg);
  opacity: 0; pointer-events: none; transition: .22s; z-index: 100;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------------- 响应式 ---------------- */
@media (max-width: 1000px) {
  .hero-inner { grid-template-columns: 1fr; gap: 40px; padding: 56px 0 64px; }
  .hero h1 { font-size: 42px; }
  .grid-products { grid-template-columns: repeat(2, 1fr); }
  .cats { grid-template-columns: repeat(3, 1fr); }
  .feats { grid-template-columns: 1fr; }
  .pd { grid-template-columns: 1fr; gap: 30px; }
  .cart-layout { grid-template-columns: 1fr; }
  .foot-cols { grid-template-columns: 1fr 1fr; gap: 30px; }
}
@media (max-width: 620px) {
  .nav { display: none; }
  .hero h1 { font-size: 34px; letter-spacing: -1px; }
  .grid-products { grid-template-columns: 1fr; }
  .cats { grid-template-columns: repeat(2, 1fr); }
  .cart-row { grid-template-columns: 70px 1fr; row-gap: 10px; }
  .cart-row .thumb { width: 70px; height: 60px; }
  .sec-head h2 { font-size: 26px; }
}

/* ---------- 页眉爱发电入口 ---------- */
.support-btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 8px 15px; border-radius: 999px;
  border: 1px solid #e2d9fb; background: #faf8ff;
  color: #8b5cf6; font-size: 14.5px; font-weight: 650;
  transition: .16s; white-space: nowrap;
}
.support-btn:hover {
  border-color: #8b5cf6; background: #f4efff; color: #7c3aed;
  transform: translateY(-1px); text-decoration: none;
}
.support-btn img { width: 16px; height: 16px; display: block; border-radius: 3px; }

/* ---------- 页脚爱发电 ---------- */
.foot-afdian { display: inline-flex; align-items: center; gap: 7px; color: #8b5cf6 !important; }
.foot-afdian img { width: 15px; height: 15px; display: block; border-radius: 3px; }
.foot-afdian:hover { color: #7c3aed !important; }

/* ---------- 页眉 PayPal 入口 ---------- */
.paypal-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 14px; border-radius: 999px;
  border: 1px solid #d3dcef; background: #f7f9fd;
  color: #003087; font-size: 14.5px; font-weight: 700;
  transition: .16s; white-space: nowrap;
}
.paypal-btn { cursor: default; }
.paypal-btn[aria-disabled="true"] { opacity: .92; }
.paypal-btn img { width: 17px; height: 17px; display: block; }

/* ---------- 页脚 PayPal ---------- */
.foot-paypal { display: inline-flex; align-items: center; gap: 7px; color: #003087 !important; }
.foot-paypal img { width: 16px; height: 16px; display: block; }
.foot-paypal[aria-disabled="true"] { cursor: default; opacity: .92; }

/* 页眉按钮变多，收紧间距 */
.site-header .wrap { gap: 18px; }
.nav { gap: 22px; }

/* 页眉按钮多时的收缩（避免挤压） */
@media (max-width: 1060px) {
  .site-header .wrap { gap: 14px; }
  .nav { gap: 16px; font-size: 14px; }
  .support-btn, .paypal-btn { padding: 7px 11px; font-size: 13.5px; }
  .support-btn img, .paypal-btn img { width: 15px; height: 15px; }
  .cart-btn { padding: 8px 13px; font-size: 13.5px; }
}
@media (max-width: 880px) {
  .nav { display: none; }
}

/* ---------- 语言切换 ---------- */
.lang-btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 46px; height: 34px; padding: 0 12px;
  border-radius: 999px; border: 1px solid var(--line-2);
  background: #fff; color: var(--ink-2);
  font-size: 13.5px; font-weight: 700; letter-spacing: .3px;
  transition: .16s;
}
.lang-btn:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }

/* ---------- 面包屑 / 页标题 / 购物车备注 ---------- */
.crumb { margin: 26px 0 0; font-size: 13.5px; color: var(--ink-3); }
.crumb a { color: var(--ink-3); }
.crumb a:hover { color: var(--accent); }
.page-title { font-size: 30px; letter-spacing: -1px; margin: 0 0 22px; font-weight: 800; }
.cart-note { margin: 14px 0 0; font-size: 12.5px; color: var(--ink-3); text-align: center; }

@media (max-width: 1060px) {
  .lang-btn { min-width: 40px; height: 30px; padding: 0 10px; font-size: 12.5px; }
}