/* ==========================================================================
   5eSIM · 落地页设计系统（亮色清爽风）
   ========================================================================== */

:root {
  --primary: #2563eb;
  --primary-600: #1d4ed8;
  --cyan: #06b6d4;
  --violet: #7c5cff;
  --green: #059669;
  --orange: #f59e0b;
  --pink: #ec4899;

  --bg: #ffffff;
  --bg-soft: #f5f8ff;
  --bg-soft-2: #eef3ff;
  --text: #0f172a;
  --text-2: #475569;
  --text-3: #94a3b8;
  --border: #e5eaf3;
  --border-strong: #d3dced;

  --grad: linear-gradient(120deg, #2563eb 0%, #06b6d4 100%);
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 12px 32px rgba(37, 99, 235, 0.10);
  --shadow-lg: 0 24px 56px rgba(37, 99, 235, 0.16);

  --radius: 18px;
  --radius-sm: 12px;
  --container: 1180px;
  --font: "Inter", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
ul, ol { list-style: none; }
button, input { font-family: inherit; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ============ 按钮 ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  border-radius: 12px; padding: 11px 22px; font-size: 14.5px; font-weight: 600;
  border: none; cursor: pointer; white-space: nowrap;
  transition: transform .2s, box-shadow .2s, background .2s, color .2s, border-color .2s;
}
.btn--primary { background: var(--grad); color: #fff; box-shadow: 0 8px 20px rgba(37, 99, 235, .28); }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(37, 99, 235, .36); }
.btn--light { background: #fff; color: var(--primary-600); box-shadow: 0 8px 20px rgba(255,255,255,.18); }
.btn--light:hover { transform: translateY(-2px); }
.btn--ghost { background: #fff; color: var(--text); border: 1.5px solid var(--border-strong); }
.btn--ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn--outline { background: transparent; color: var(--primary); border: 1.5px solid var(--primary); }
.btn--outline:hover { background: var(--primary); color: #fff; }
.btn--lg { padding: 14px 28px; font-size: 16px; border-radius: 14px; }
.btn--sm { padding: 8px 16px; font-size: 13.5px; border-radius: 10px; }
.btn--block { width: 100%; }

/* ============ 导航 ============ */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow .3s;
}
.header.is-scrolled { box-shadow: var(--shadow-sm); }
.header__inner { display: flex; align-items: center; gap: 28px; height: 68px; }

.logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo__mark { display: grid; place-items: center; }
.logo__text { font-size: 21px; font-weight: 800; letter-spacing: -.3px; }
.footer .logo__text { color: #fff; }

.nav { display: flex; gap: 4px; flex: 1; }
.nav__link {
  padding: 8px 13px; border-radius: 10px; font-size: 14.5px; font-weight: 500;
  color: var(--text-2); transition: color .2s, background .2s;
}
.nav__link:hover { color: var(--primary); background: var(--bg-soft); }

.header__actions { display: flex; align-items: center; gap: 14px; flex-shrink: 0; }
.header__lang { display: inline-flex; align-items: center; gap: 4px; font-size: 13.5px; color: var(--text-2); }
.header__lang:hover { color: var(--primary); }
.header__login { font-size: 14px; color: var(--text-2); font-weight: 500; }
.header__login:hover { color: var(--primary); }

.burger { display: none; flex-direction: column; gap: 4px; justify-content: center; background: none; border: none; cursor: pointer; width: 40px; height: 40px; border-radius: 10px; }
.burger span { width: 18px; height: 2px; background: var(--text); border-radius: 2px; margin: 0 auto; transition: transform .25s, opacity .25s; }
.burger.is-open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.burger.is-open span:nth-child(2) { opacity: 0; }
.burger.is-open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ============ Hero ============ */
.hero { padding: 64px 0 0; overflow: hidden; position: relative; }
.hero::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 560px;
  background:
    radial-gradient(800px 420px at 82% -60px, rgba(37, 99, 235, .10), transparent 60%),
    radial-gradient(700px 380px at 12% -80px, rgba(6, 182, 212, .09), transparent 60%);
  pointer-events: none;
}
.hero__inner { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; position: relative; }

.hero__badge {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 13px; font-weight: 600; color: var(--primary);
  background: var(--bg-soft); border: 1px solid var(--border-strong);
  border-radius: 999px; padding: 7px 15px; margin-bottom: 22px;
}
.hero__title { font-size: 48px; font-weight: 800; line-height: 1.22; letter-spacing: -1px; }
.hero__grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero__desc { font-size: 17px; color: var(--text-2); margin: 20px 0 30px; max-width: 520px; }
.hero__desc strong { color: var(--text); }
.hero__cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero__meta { display: flex; align-items: center; gap: 12px; margin-top: 28px; font-size: 13.5px; color: var(--text-3); }
.hero__meta strong { color: var(--text); font-size: 15px; }
.hero__meta .dot { width: 4px; height: 4px; border-radius: 50%; background: var(--border-strong); }

.hero__visual { position: relative; display: grid; place-items: center; min-height: 400px; }
.card-visual {
  position: relative; width: 300px; height: 190px; border-radius: 22px;
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 55%, #06b6d4 130%);
  box-shadow: var(--shadow-lg); padding: 24px; color: #fff;
  transform: rotate(-4deg); transition: transform .4s ease;
}
.hero__visual:hover .card-visual { transform: rotate(0deg) translateY(-4px); }
.card-visual__chip { width: 36px; height: 28px; border-radius: 6px; background: linear-gradient(135deg, #fbbf24, #f59e0b); margin-bottom: 16px; }
.card-visual__brand { font-size: 22px; font-weight: 800; letter-spacing: .5px; }
.card-visual__brand em { font-style: normal; font-size: 11px; background: #fff; color: #1e3a8a; border-radius: 5px; padding: 2px 7px; vertical-align: 2px; margin-left: 8px; font-weight: 700; }
.card-visual__num { font-size: 13px; letter-spacing: 2.5px; opacity: .75; margin-top: 18px; font-variant-numeric: tabular-nums; }
.card-visual__stats { display: flex; gap: 18px; margin-top: 14px; }
.card-visual__stats span { font-size: 11.5px; opacity: .8; }
.card-visual__stats b { display: block; font-size: 17px; font-weight: 700; opacity: 1; }
.card-visual__ring { position: absolute; right: -46px; bottom: -46px; width: 150px; height: 150px; border-radius: 50%; border: 1.6px dashed rgba(255,255,255,.35); }

.hero__float {
  position: absolute; display: flex; align-items: center; gap: 8px;
  background: #fff; border: 1px solid var(--border); border-radius: 14px;
  padding: 10px 16px; font-size: 13px; font-weight: 600; color: var(--text);
  box-shadow: var(--shadow-md); animation: floaty 5s ease-in-out infinite;
}
.hero__float--1 { top: 14%; left: -4%; }
.hero__float--2 { bottom: 16%; right: -2%; animation-delay: 1.6s; }
@keyframes floaty { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

/* 信任条 */
.trustbar { display: flex; align-items: center; gap: 26px; padding: 28px 0 34px; margin-top: 40px; border-top: 1px solid var(--border); flex-wrap: wrap; }
.trustbar > span { font-size: 13px; color: var(--text-3); white-space: nowrap; }
.trustbar__logos { display: flex; gap: 34px; flex-wrap: wrap; }
.trustbar__logos i { font-style: normal; font-size: 17px; font-weight: 700; color: #b6c2d9; letter-spacing: .5px; }

/* ============ Section 通用 ============ */
.section { padding: 72px 0; }
.section-head { text-align: center; max-width: 620px; margin: 0 auto 48px; }
.section-head__eyebrow {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 1px;
  color: var(--primary); text-transform: uppercase; margin-bottom: 12px;
}
.section-head__eyebrow--light { color: #93c5fd; }
.section-head__title { font-size: 34px; font-weight: 800; letter-spacing: -.5px; }
.section-head__desc { color: var(--text-2); margin-top: 12px; font-size: 15.5px; }

/* ============ 核心卖点 ============ */
.features__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 26px; transition: transform .25s, box-shadow .25s, border-color .25s;
}
.feature:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: transparent; }
.feature__icon {
  width: 50px; height: 50px; border-radius: 14px; display: grid; place-items: center; margin-bottom: 18px;
}
.icon--blue { background: rgba(37, 99, 235, .12); color: #2563eb; }
.icon--cyan { background: rgba(6, 182, 212, .12); color: #0891b2; }
.icon--violet { background: rgba(124, 92, 255, .12); color: #7c5cff; }
.icon--green { background: rgba(5, 150, 105, .12); color: #059669; }
.icon--orange { background: rgba(245, 158, 11, .14); color: #d97706; }
.icon--pink { background: rgba(236, 72, 153, .12); color: #db2777; }
.feature h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.feature p { font-size: 14px; color: var(--text-2); line-height: 1.75; }

/* ============ 卡片产品线 ============ */
.cards-sec { background: var(--bg-soft); }
.cards-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: stretch; }
.price-card {
  position: relative; background: #fff; border: 1px solid var(--border); border-radius: 22px;
  padding: 30px 26px; display: flex; flex-direction: column; gap: 14px;
  transition: transform .25s, box-shadow .25s;
}
.price-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.price-card--featured {
  border: 2px solid transparent;
  background: linear-gradient(#fff, #fff) padding-box, var(--grad) border-box;
  box-shadow: var(--shadow-md);
}
.price-card__tag {
  position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
  font-size: 12px; font-weight: 700; color: var(--text-2);
  background: var(--bg-soft-2); border: 1px solid var(--border-strong);
  border-radius: 999px; padding: 4px 14px; white-space: nowrap;
}
.price-card__tag--hot { background: var(--grad); color: #fff; border: none; }
.price-card__name { font-size: 23px; font-weight: 800; text-align: center; }
.price-card__sub { font-size: 13px; color: var(--text-3); text-align: center; margin-top: -8px; }
.price-card__price { text-align: center; font-size: 44px; font-weight: 800; letter-spacing: -1px; }
.price-card__price .cur { font-size: 22px; vertical-align: 18px; margin-right: 2px; }
.price-card__price del { font-size: 17px; color: var(--text-3); font-weight: 500; margin-left: 8px; }
.price-card__specs { display: flex; flex-direction: column; gap: 10px; padding: 8px 0 16px; border-top: 1px dashed var(--border); }
.price-card__specs li { font-size: 14px; color: var(--text-2); display: flex; align-items: center; gap: 8px; }
.price-card__specs li::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--grad); flex-shrink: 0; }
.price-card__specs b { color: var(--text); }
.price-card--featured .price-card__specs li::before { background: var(--grad); }
.cards-note { text-align: center; font-size: 12.5px; color: var(--text-3); margin-top: 24px; }

/* ============ 流量套餐商城 ============ */
.plan-tabs { display: flex; justify-content: center; gap: 8px; margin-bottom: 30px; flex-wrap: wrap; }
.plan-tab {
  border: 1.5px solid var(--border-strong); background: #fff; color: var(--text-2);
  font-size: 14px; font-weight: 600; padding: 9px 24px; border-radius: 999px; cursor: pointer;
  transition: all .2s;
}
.plan-tab:hover { border-color: var(--primary); color: var(--primary); }
.plan-tab.is-active { background: var(--grad); color: #fff; border-color: transparent; box-shadow: 0 6px 16px rgba(37, 99, 235, .28); }

.plan-panel { display: none; }
.plan-panel.is-active { display: block; animation: fadeUp .35s ease; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

.plan-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.plan-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; display: flex; flex-direction: column; gap: 14px;
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.plan-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: var(--border-strong); }
.plan-card--hot { border-color: rgba(37, 99, 235, .35); background: linear-gradient(180deg, rgba(37,99,235,.04), #fff 40%); }
.plan-card__head { display: flex; gap: 12px; align-items: center; }
.plan-card__flag { font-size: 30px; line-height: 1; }
.plan-card__head h3 { font-size: 16px; font-weight: 700; }
.plan-card__head p { font-size: 12.5px; color: var(--text-3); }
.plan-card__data { font-size: 13.5px; color: var(--text-2); }
.plan-card__data b { font-size: 22px; color: var(--text); }
.plan-card__data em { font-style: normal; font-size: 11px; font-weight: 700; color: #fff; background: var(--orange); border-radius: 5px; padding: 2px 7px; margin-left: 6px; vertical-align: 2px; }
.plan-card__foot { display: flex; align-items: center; justify-content: space-between; border-top: 1px solid var(--border); padding-top: 14px; }
.plan-card__price { font-size: 22px; font-weight: 800; color: var(--primary); }

.plans__foot { text-align: center; margin-top: 32px; color: var(--text-3); font-size: 14px; }
.plans__foot .btn { margin-left: 14px; }
.plans__foot strong { color: var(--text); }

/* ============ 覆盖数据 ============ */
.coverage__card {
  border-radius: 26px; padding: 48px 52px; display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center;
  background:
    radial-gradient(500px 280px at 100% 0%, rgba(6, 182, 212, .35), transparent 60%),
    radial-gradient(480px 300px at 0% 100%, rgba(124, 92, 255, .4), transparent 60%),
    linear-gradient(140deg, #1e3a8a, #2563eb 55%, #0891b2);
  color: #fff; position: relative; overflow: hidden;
}
.coverage__text p { color: rgba(255,255,255,.85); margin: 14px 0 26px; font-size: 15px; }
.coverage__title { font-size: 30px; font-weight: 800; letter-spacing: -.5px; }
.coverage__stats { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.stat-cell {
  background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.22);
  border-radius: 16px; padding: 20px; backdrop-filter: blur(6px);
}
.stat-cell b { display: block; font-size: 38px; font-weight: 800; letter-spacing: -1px; }
.stat-cell span { font-size: 13px; opacity: .85; }

/* ============ 兼容性 ============ */
.compat__head { text-align: center; margin-bottom: 40px; }
.compat__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.compat__col { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 28px 24px; }
.compat__col h3 { display: flex; align-items: center; gap: 9px; font-size: 16.5px; font-weight: 700; margin-bottom: 10px; }
.compat__col p { font-size: 14px; color: var(--text-2); line-height: 1.75; }
.compat__note { text-align: center; font-size: 12.5px; color: var(--text-3); margin-top: 22px; }

/* ============ 使用流程 ============ */
.how { background: var(--bg-soft); }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.step { position: relative; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 30px 24px; text-align: center; transition: transform .25s, box-shadow .25s; }
.step:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.step__num {
  position: absolute; top: -15px; left: 50%; transform: translateX(-50%);
  width: 30px; height: 30px; border-radius: 50%; background: var(--grad); color: #fff;
  font-size: 14px; font-weight: 700; display: grid; place-items: center;
  box-shadow: 0 4px 12px rgba(37, 99, 235, .35);
}
.step__icon { width: 56px; height: 56px; border-radius: 16px; background: var(--bg-soft-2); color: var(--primary); display: grid; place-items: center; margin: 6px auto 16px; }
.step h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.step p { font-size: 13.5px; color: var(--text-2); line-height: 1.7; }

/* ============ 用户评价 ============ */
.reviews { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.review { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; display: flex; flex-direction: column; gap: 14px; }
.review__stars { color: #f59e0b; letter-spacing: 2px; font-size: 15px; }
.review p { font-size: 14.5px; color: var(--text-2); line-height: 1.8; flex: 1; }
.review__user { display: flex; align-items: center; gap: 12px; }
.review__user .avatar { width: 42px; height: 42px; border-radius: 50%; display: grid; place-items: center; color: #fff; font-weight: 700; font-style: normal; }
.avatar--a { background: linear-gradient(135deg, #2563eb, #06b6d4); }
.avatar--b { background: linear-gradient(135deg, #7c5cff, #2563eb); }
.avatar--c { background: linear-gradient(135deg, #f59e0b, #ec4899); }
.review__user b { display: block; font-size: 14px; }
.review__user em { font-style: normal; font-size: 12px; color: var(--text-3); }

/* ============ FAQ ============ */
.faq__list { max-width: 720px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item { background: #fff; border: 1px solid var(--border); border-radius: 14px; overflow: hidden; transition: border-color .2s, box-shadow .2s; }
.faq-item.is-open { border-color: rgba(37, 99, 235, .35); box-shadow: var(--shadow-sm); }
.faq-item__q {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 18px 22px; background: none; border: none; cursor: pointer;
  font-size: 15.5px; font-weight: 600; color: var(--text); text-align: left;
}
.faq-item__icon { position: relative; width: 18px; height: 18px; flex-shrink: 0; }
.faq-item__icon::before, .faq-item__icon::after {
  content: ""; position: absolute; background: var(--primary); border-radius: 2px;
  top: 50%; left: 50%; transform: translate(-50%, -50%); transition: transform .25s;
}
.faq-item__icon::before { width: 14px; height: 2px; }
.faq-item__icon::after { width: 2px; height: 14px; }
.faq-item.is-open .faq-item__icon::after { transform: translate(-50%, -50%) scaleY(0); }
.faq-item__a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-item__a p { padding: 0 22px 20px; font-size: 14px; color: var(--text-2); line-height: 1.8; }
.faq-item__a strong { color: var(--text); }

/* ============ CTA ============ */
.cta {
  border-radius: 24px; padding: 44px 50px; display: flex; align-items: center; justify-content: space-between; gap: 28px;
  background:
    radial-gradient(480px 240px at 92% -40px, rgba(6, 182, 212, .35), transparent 60%),
    linear-gradient(140deg, #1e3a8a, #2563eb 60%, #0891b2);
  color: #fff; flex-wrap: wrap;
}
.cta__text h2 { font-size: 27px; font-weight: 800; letter-spacing: -.5px; }
.cta__text p { color: rgba(255,255,255,.85); font-size: 14.5px; margin-top: 6px; }
.cta__form { display: flex; gap: 10px; background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.25); border-radius: 14px; padding: 6px; }
.cta__form input { border: none; outline: none; background: none; color: #fff; padding: 10px 16px; font-size: 14.5px; min-width: 240px; }
.cta__form input::placeholder { color: rgba(255,255,255,.6); }
.cta__form .btn { flex-shrink: 0; }

/* ============ 页脚 ============ */
.footer { background: #0b1526; color: #cbd5e1; margin-top: 72px; }
.footer__grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 34px; padding: 52px 24px 40px; }
.footer__brand p { font-size: 13.5px; color: #7c8aa5; margin-top: 14px; max-width: 300px; }
.footer__social { display: flex; gap: 10px; margin-top: 20px; }
.footer__social a {
  width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center;
  background: rgba(255,255,255,.08); font-size: 14px; transition: background .2s;
}
.footer__social a:hover { background: var(--primary); color: #fff; }
.footer__col { display: flex; flex-direction: column; gap: 11px; }
.footer__col h4 { font-size: 14.5px; font-weight: 700; color: #fff; margin-bottom: 6px; }
.footer__col a { font-size: 13.5px; color: #7c8aa5; transition: color .2s; width: max-content; }
.footer__col a:hover { color: #fff; }
.footer__bottom { border-top: 1px solid rgba(255,255,255,.08); padding: 18px 0; }
.footer__bottom-inner { display: flex; justify-content: space-between; gap: 14px; font-size: 12.5px; color: #64748b; flex-wrap: wrap; }

/* ============ 回到顶部 ============ */
.backtop {
  position: fixed; right: 26px; bottom: 30px; z-index: 90;
  width: 44px; height: 44px; border-radius: 14px; border: none; cursor: pointer;
  background: var(--grad); color: #fff; display: grid; place-items: center;
  box-shadow: 0 10px 26px rgba(37, 99, 235, .4);
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: opacity .25s, transform .25s, visibility .25s;
}
.backtop.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }

/* ============ Toast ============ */
.toast {
  position: fixed; left: 50%; bottom: 40px; transform: translateX(-50%) translateY(16px);
  z-index: 400; background: #0f172a; color: #fff; font-size: 13.5px;
  padding: 11px 22px; border-radius: 999px; box-shadow: 0 14px 36px rgba(15, 23, 42, .3);
  opacity: 0; visibility: hidden; transition: opacity .25s, transform .25s, visibility .25s;
}
.toast.is-visible { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }

/* ============ 响应式 ============ */
@media (max-width: 1080px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__visual { order: -1; min-height: 320px; }
  .features__grid { grid-template-columns: repeat(2, 1fr); }
  .cards-grid, .plan-grid { grid-template-columns: 1fr; }
  .coverage__card { grid-template-columns: 1fr; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .reviews { grid-template-columns: 1fr; }
  .compat__grid { grid-template-columns: 1fr; }
}
@media (max-width: 860px) {
  .nav {
    position: fixed; top: 80px; left: 14px; right: 14px; flex-direction: column; gap: 4px;
    padding: 14px; background: #fff; border: 1px solid var(--border); border-radius: 16px;
    box-shadow: var(--shadow-lg); opacity: 0; visibility: hidden; transform: translateY(-10px);
    transition: all .25s; z-index: 99;
  }
  .nav.is-open { opacity: 1; visibility: visible; transform: translateY(0); }
  .burger { display: flex; }
  .header__actions .btn--primary, .header__login, .header__lang { display: none; }
  .hero__title { font-size: 36px; }
  .features__grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .cta { flex-direction: column; text-align: center; padding: 36px 24px; }
  .cta__form { flex-direction: column; width: 100%; }
  .cta__form input { min-width: 0; width: 100%; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
  .container { padding: 0 16px; }
  .hero { padding-top: 40px; }
  .hero__title { font-size: 30px; }
  .section { padding: 52px 0; }
  .section-head__title { font-size: 27px; }
  .card-visual { width: 260px; height: 165px; }
  .footer__grid { grid-template-columns: 1fr; }
  .coverage__card { padding: 32px 24px; }
  .coverage__stats { grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* ==========================================================================
   子页面通用（硬件卡 / 流量套餐 / 覆盖 / 指南 / FAQ）
   ========================================================================== */

.nav__link.is-active { color: var(--primary); font-weight: 600; background: var(--bg-soft); }

/* ---------- 页头 Page Hero ---------- */
.page-hero {
  padding: 60px 0 48px; text-align: center; position: relative; overflow: hidden;
  background:
    radial-gradient(700px 340px at 50% -120px, rgba(37, 99, 235, .12), transparent 60%),
    radial-gradient(560px 280px at 85% -60px, rgba(6, 182, 212, .1), transparent 60%);
}
.crumb { display: flex; align-items: center; justify-content: center; gap: 6px; font-size: 13px; color: var(--text-3); margin-bottom: 18px; flex-wrap: wrap; }
.crumb a:hover { color: var(--primary); }
.crumb .sep { opacity: .5; }
.page-hero__title { font-size: 40px; font-weight: 800; letter-spacing: -1px; }
.page-hero__title em { font-style: normal; background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.page-hero__desc { color: var(--text-2); font-size: 16px; max-width: 620px; margin: 14px auto 0; }

/* ---------- 筛选条 ---------- */
.filter-bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 26px; }
.search-box {
  display: flex; align-items: center; gap: 9px; background: #fff; border: 1.5px solid var(--border-strong);
  border-radius: 12px; padding: 10px 16px; min-width: 280px; flex: 1; max-width: 420px;
  color: var(--text-3); transition: border-color .2s;
}
.search-box:focus-within { border-color: var(--primary); }
.search-box input { border: none; outline: none; background: none; color: var(--text); font-size: 14.5px; width: 100%; }
.search-box input::placeholder { color: var(--text-3); }
.chip-filter { display: flex; gap: 8px; flex-wrap: wrap; }
.chip-filter button {
  border: 1.5px solid var(--border-strong); background: #fff; color: var(--text-2);
  font-size: 13px; font-weight: 600; padding: 8px 18px; border-radius: 999px; cursor: pointer; transition: all .2s;
}
.chip-filter button:hover { border-color: var(--primary); color: var(--primary); }
.chip-filter button.is-active { background: var(--grad); color: #fff; border-color: transparent; }

/* ---------- 规格对比表（硬件卡页） ---------- */
.spec-table-wrap { overflow-x: auto; background: #fff; border: 1px solid var(--border); border-radius: 20px; }
.spec-table { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 640px; }
.spec-table th, .spec-table td { padding: 16px 22px; text-align: center; border-bottom: 1px solid var(--border); }
.spec-table thead th { font-size: 15px; }
.spec-table thead .th-name { text-align: left; }
.spec-table thead .th-featured { color: var(--primary); position: relative; }
.spec-table thead .th-featured .tag-mini { display: block; font-size: 10.5px; font-weight: 700; color: #fff; background: var(--grad); border-radius: 6px; padding: 2px 8px; margin: 6px auto 0; width: max-content; }
.spec-table tbody td:first-child { text-align: left; color: var(--text-2); font-weight: 500; }
.spec-table tbody td b { color: var(--text); }
.spec-table tr:last-child td { border-bottom: none; }
.spec-table tbody tr:hover { background: var(--bg-soft); }
.spec-table .cell-highlight { color: var(--primary); font-weight: 700; }

/* ---------- 硬件卡详情 ---------- */
.card-detail { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; padding: 60px 0; border-bottom: 1px solid var(--border); }
.card-detail:last-child { border-bottom: none; }
.card-detail--flip .card-detail__visual { order: 2; }
.card-detail__visual { display: grid; place-items: center; }
.card-detail__visual .card-visual { transform: none; }
.card-detail__name { display: flex; align-items: center; gap: 12px; font-size: 26px; font-weight: 800; }
.card-detail__name .tag-mini { font-size: 12px; font-weight: 700; color: #fff; background: var(--grad); border-radius: 7px; padding: 3px 10px; }
.card-detail__desc { color: var(--text-2); margin: 14px 0 20px; font-size: 15px; }
.card-detail__list { display: flex; flex-direction: column; gap: 10px; margin-bottom: 24px; }
.card-detail__list li { display: flex; gap: 10px; font-size: 14px; color: var(--text-2); }
.card-detail__list li::before { content: "✓"; color: var(--green); font-weight: 700; flex-shrink: 0; }
.card-detail__list b { color: var(--text); }

/* ---------- 国家覆盖列表 ---------- */
.region-tabs { display: flex; justify-content: center; gap: 8px; margin-bottom: 30px; flex-wrap: wrap; }
.region-block { margin-bottom: 36px; }
.region-block__head { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.region-block__head h3 { font-size: 18px; font-weight: 800; }
.region-block__head span { font-size: 12.5px; color: var(--text-3); }
.country-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.country-item {
  display: flex; align-items: center; gap: 10px; padding: 11px 14px;
  background: #fff; border: 1px solid var(--border); border-radius: 11px; font-size: 14px;
  transition: border-color .2s, transform .2s;
}
.country-item:hover { border-color: var(--primary); transform: translateY(-2px); }
.country-item .flag { font-size: 20px; line-height: 1; }
.country-item.is-hidden { display: none; }

/* ---------- 使用指南 ---------- */
.guide-tabs { display: flex; justify-content: center; gap: 10px; margin-bottom: 32px; flex-wrap: wrap; }
.guide-tabs button {
  display: inline-flex; align-items: center; gap: 8px; border: 1.5px solid var(--border-strong);
  background: #fff; color: var(--text-2); font-size: 14px; font-weight: 600;
  padding: 10px 22px; border-radius: 999px; cursor: pointer; transition: all .2s;
}
.guide-tabs button:hover { border-color: var(--primary); color: var(--primary); }
.guide-tabs button.is-active { background: var(--grad); color: #fff; border-color: transparent; box-shadow: 0 6px 16px rgba(37, 99, 235, .28); }
.guide-panel { display: none; }
.guide-panel.is-active { display: block; animation: fadeUp .35s ease; }
.guide-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-bottom: 36px; }
.guide-card {
  display: flex; gap: 18px; align-items: flex-start; padding: 24px;
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
}
.guide-card__num { width: 40px; height: 40px; border-radius: 12px; background: var(--grad); color: #fff; font-weight: 700; font-size: 16px; display: grid; place-items: center; flex-shrink: 0; }
.guide-card h4 { font-size: 15.5px; font-weight: 700; margin-bottom: 6px; }
.guide-card p { font-size: 13.5px; color: var(--text-2); line-height: 1.7; }

/* ---------- FAQ 分类 ---------- */
.faq-cat { margin-bottom: 34px; }
.faq-cat__head { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.faq-cat__head .ic { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; background: var(--bg-soft-2); color: var(--primary); }
.faq-cat__head h3 { font-size: 18px; font-weight: 800; }

/* ---------- 联系支持 CTA ---------- */
.support-card {
  text-align: center; padding: 48px 28px; border-radius: 22px;
  background: linear-gradient(140deg, #1e3a8a, #2563eb 60%, #0891b2); color: #fff;
}
.support-card h3 { font-size: 24px; font-weight: 800; }
.support-card p { color: rgba(255,255,255,.85); margin: 10px 0 24px; }
.support-card .btn-group { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ---------- 子页面响应式 ---------- */
@media (max-width: 860px) {
  .card-detail { grid-template-columns: 1fr; gap: 28px; padding: 40px 0; }
  .card-detail--flip .card-detail__visual { order: 0; }
  .country-list { grid-template-columns: repeat(2, 1fr); }
  .guide-steps { grid-template-columns: 1fr; }
  .page-hero__title { font-size: 30px; }
}
@media (max-width: 520px) {
  .country-list { grid-template-columns: 1fr 1fr; }
}