/* =========================================================
   码上云联 · 开发服务落地页 样式
   设计：现代化 B2B 科技风，移动优先响应式
   ========================================================= */

:root {
  --c-primary: #4f46e5;
  --c-primary-dark: #4338ca;
  --c-secondary: #2563eb;
  --c-accent: #06b6d4;
  --c-ink: #0f172a;
  --c-text: #1e293b;
  --c-muted: #64748b;
  --c-line: #e2e8f0;
  --c-bg: #ffffff;
  --c-bg-alt: #f8fafc;
  --c-bg-soft: #eef2ff;
  --grad: linear-gradient(135deg, #6366f1 0%, #2563eb 100%);
  --grad-soft: linear-gradient(135deg, #eef2ff 0%, #e0f2fe 100%);
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, .08);
  --shadow-md: 0 10px 30px rgba(15, 23, 42, .10);
  --shadow-lg: 0 20px 50px rgba(79, 70, 229, .18);
  --radius: 16px;
  --radius-sm: 10px;
  --maxw: 1160px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

h1, h2, h3 { color: var(--c-ink); line-height: 1.25; margin: 0 0 .5em; font-weight: 800; }

p { margin: 0 0 1em; }

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

.container.narrow { max-width: 820px; }

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--c-primary);
  margin-bottom: 10px;
}

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ===================== 按钮 ===================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease;
  white-space: nowrap;
}
.btn-primary { background: var(--grad); color: #fff; box-shadow: var(--shadow-md); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-ghost { background: rgba(255,255,255,.7); color: var(--c-primary); border-color: var(--c-line); }
.btn-ghost:hover { background: #fff; transform: translateY(-2px); }
.btn-lg { padding: 15px 30px; font-size: 16px; }
.btn-block { width: 100%; }
.btn:disabled { opacity: .7; cursor: not-allowed; transform: none; box-shadow: none; }

/* ===================== 顶部导航 ===================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .82);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--c-line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; }
.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 34px; height: 34px;
  border-radius: 9px;
  background: var(--grad);
  color: #fff;
  font-family: monospace;
  font-weight: 700;
}
.brand-name { font-size: 18px; color: var(--c-ink); }

.nav-links { display: flex; align-items: center; gap: 26px; }
.nav-links a { font-weight: 600; color: var(--c-text); font-size: 15px; transition: color .15s; }
.nav-links a:hover { color: var(--c-primary); }
.nav-cta { color: #fff !important; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  width: 24px; height: 2px; background: var(--c-ink); border-radius: 2px;
  transition: transform .25s, opacity .25s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===================== Hero ===================== */
.hero { position: relative; overflow: hidden; padding: 72px 0 84px; }
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(60% 60% at 85% 10%, rgba(99,102,241,.18), transparent 60%),
    radial-gradient(50% 50% at 5% 90%, rgba(6,182,212,.15), transparent 60%),
    linear-gradient(180deg, #fbfbff 0%, #ffffff 100%);
}
.hero-inner {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center;
}
.badge {
  display: inline-block;
  background: var(--c-bg-soft);
  color: var(--c-primary-dark);
  border: 1px solid #c7d2fe;
  padding: 7px 14px; border-radius: 999px;
  font-size: 14px; font-weight: 600; margin-bottom: 20px;
}
.hero h1 { font-size: clamp(32px, 5vw, 52px); margin-bottom: 18px; }
.hero-sub { font-size: 18px; color: var(--c-muted); max-width: 520px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin: 26px 0 30px; }
.hero-trust { display: flex; gap: 34px; list-style: none; padding: 0; margin: 0; flex-wrap: wrap; }
.hero-trust li { display: flex; flex-direction: column; }
.hero-trust strong { font-size: 26px; color: var(--c-ink); }
.hero-trust span { font-size: 13px; color: var(--c-muted); }

/* Hero 视觉 */
.hero-visual { position: relative; min-height: 340px; }
.device-card {
  background: #fff; border: 1px solid var(--c-line);
  border-radius: 20px; padding: 22px; box-shadow: var(--shadow-lg);
  position: relative; z-index: 2;
}
.device-dots { display: flex; gap: 7px; margin-bottom: 16px; }
.device-dots i { width: 11px; height: 11px; border-radius: 50%; background: #cbd5e1; }
.device-dots i:nth-child(1){ background:#f87171; } .device-dots i:nth-child(2){ background:#fbbf24; } .device-dots i:nth-child(3){ background:#34d399; }
.device-line { height: 12px; border-radius: 6px; background: #eef2f7; margin-bottom: 12px; }
.device-line.w90{ width:90%; } .device-line.w70{ width:70%; } .device-line.w80{ width:80%; }
.device-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 18px; }
.device-grid span { height: 56px; border-radius: 12px; background: var(--grad-soft); }
.device-grid span:nth-child(2){ background: linear-gradient(135deg,#dbeafe,#e0f2fe); }
.device-grid span:nth-child(3){ background: linear-gradient(135deg,#ede9fe,#e0e7ff); }
.float-chip {
  position: absolute; z-index: 3;
  background: #fff; border: 1px solid var(--c-line);
  padding: 9px 14px; border-radius: 12px; font-size: 13px; font-weight: 600;
  box-shadow: var(--shadow-md);
}
.chip-a { top: 6%; left: -6%; animation: float 4s ease-in-out infinite; }
.chip-b { top: 44%; right: -8%; animation: float 4s ease-in-out infinite .8s; }
.chip-c { bottom: 4%; left: 8%; animation: float 4s ease-in-out infinite 1.6s; }
@keyframes float { 0%,100%{ transform: translateY(0); } 50%{ transform: translateY(-10px); } }

/* ===================== 通用区块 ===================== */
.section { padding: 76px 0; }
.section-alt { background: var(--c-bg-alt); }
.section-head { text-align: center; max-width: 640px; margin: 0 auto 46px; }
.section-head h2 { font-size: clamp(26px, 3.4vw, 36px); }
.section-head p { color: var(--c-muted); font-size: 17px; }

/* 三列卡片 */
.cards-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

/* 服务卡片 */
.service-card, .case-card, .adv-item {
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
  padding: 30px 26px; box-shadow: var(--shadow-sm);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.service-card:hover, .case-card:hover, .adv-item:hover {
  transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: #c7d2fe;
}
.service-icon {
  width: 58px; height: 58px; border-radius: 14px; display: grid; place-items: center;
  font-size: 28px; background: var(--grad-soft); margin-bottom: 16px;
}
.service-card h3, .adv-item h3 { font-size: 20px; }
.service-card p, .adv-item p { color: var(--c-muted); }
.feature-list { list-style: none; padding: 0; margin: 16px 0; }
.feature-list li { position: relative; padding-left: 24px; margin-bottom: 8px; color: var(--c-text); font-size: 15px; }
.feature-list li::before { content: "✓"; position: absolute; left: 0; color: var(--c-primary); font-weight: 800; }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.tag { font-size: 12px; padding: 4px 11px; border-radius: 999px; background: var(--c-bg-soft); color: var(--c-primary-dark); font-weight: 600; }

/* 核心优势 */
.advantages .adv-item { text-align: left; }
.adv-icon { font-size: 28px; margin-bottom: 10px; }

/* 开发流程 steps */
.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; counter-reset: none; }
.step {
  position: relative; background: #fff; border: 1px solid var(--c-line);
  border-radius: var(--radius); padding: 26px 20px; text-align: center;
}
.step-no {
  display: inline-grid; place-items: center; width: 46px; height: 46px;
  border-radius: 50%; background: var(--grad); color: #fff; font-weight: 800; font-size: 17px;
  margin-bottom: 14px;
}
.step h3 { font-size: 17px; }
.step p { font-size: 14px; color: var(--c-muted); margin: 0; }

/* 数据 band */
.stats-band { background: var(--c-ink); color: #fff; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-num { display: block; font-size: clamp(34px, 5vw, 50px); font-weight: 800;
  background: linear-gradient(135deg,#a5b4fc,#67e8f9); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat-label { color: #cbd5e1; font-size: 15px; }

/* 案例 */
.case-tag {
  display: inline-block; font-size: 12px; font-weight: 700; color: var(--c-primary-dark);
  background: var(--c-bg-soft); padding: 4px 12px; border-radius: 999px; margin-bottom: 12px;
}
.case-card h3 { font-size: 18px; }
.case-card p { color: var(--c-muted); margin: 0; font-size: 15px; }

/* FAQ */
.faq-list { display: grid; gap: 12px; }
.faq-item {
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius-sm);
  padding: 4px 20px; transition: border-color .2s;
}
.faq-item[open] { border-color: #c7d2fe; box-shadow: var(--shadow-sm); }
.faq-item summary {
  cursor: pointer; font-weight: 700; color: var(--c-ink);
  padding: 16px 0; list-style: none; position: relative;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; position: absolute; right: 0; font-size: 22px; color: var(--c-primary); transition: transform .2s; }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p { color: var(--c-muted); padding: 0 0 16px; margin: 0; }

/* ===================== 联系我们 ===================== */
.contact { background: var(--grad-soft); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.contact-copy h2 { font-size: clamp(24px, 3vw, 32px); }
.contact-info { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 12px; }
.contact-info li { font-size: 15px; color: var(--c-text); }
.contact-info strong { color: var(--c-ink); }

.contact-form {
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow-md); display: grid; gap: 16px;
}
.field { display: grid; gap: 6px; }
.field label { font-size: 14px; font-weight: 600; color: var(--c-ink); }
.field input, .field select, .field textarea {
  font-family: inherit; font-size: 15px; padding: 12px 14px;
  border: 1px solid var(--c-line); border-radius: var(--radius-sm); background: #fff;
  color: var(--c-text); transition: border-color .15s, box-shadow .15s; width: 100%;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--c-primary); box-shadow: 0 0 0 3px rgba(79,70,229,.15);
}
.field textarea { resize: vertical; }
.form-hint { font-size: 14px; margin: 0; min-height: 20px; }
.form-hint.ok { color: #16a34a; }
.form-hint.err { color: #dc2626; }

/* ===================== 页脚 ===================== */
.site-footer { background: var(--c-ink); color: #cbd5e1; padding: 48px 0 0; }
.footer-inner { display: flex; justify-content: space-between; gap: 30px; flex-wrap: wrap; padding-bottom: 30px; }
.footer-brand .brand-mark { margin-bottom: 12px; }
.footer-brand .brand-name { color: #fff; font-size: 18px; }
.footer-brand p { color: #94a3b8; font-size: 14px; max-width: 280px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 18px; }
.footer-links a { color: #cbd5e1; font-size: 14px; }
.footer-links a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding: 18px 0; font-size: 13px; color: #94a3b8; }
.footer-bottom .container { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }

/* 返回顶部 */
.to-top {
  position: fixed; right: 22px; bottom: 22px; z-index: 60;
  width: 46px; height: 46px; border-radius: 50%; border: 0;
  background: var(--grad); color: #fff; font-size: 20px; cursor: pointer;
  box-shadow: var(--shadow-lg); transition: transform .2s, opacity .2s;
}
.to-top:hover { transform: translateY(-3px); }

/* 联系信息可点击样式 */
.contact-info a { color: var(--c-primary); border-bottom: 1px solid #c7d2fe; }
.contact-info a:hover { color: var(--c-primary-dark); border-bottom-color: var(--c-primary-dark); }

/* 复制微信号按钮 */
.copy-btn {
  margin-left: 10px;
  font-size: 12px; font-weight: 700;
  padding: 3px 10px; border-radius: 999px;
  border: 1px solid #c7d2fe; background: var(--c-bg-soft);
  color: var(--c-primary-dark); cursor: pointer;
  font-family: inherit;
  transition: background .15s, color .15s;
}
.copy-btn:hover { background: var(--c-primary); color: #fff; border-color: var(--c-primary); }

/* 悬浮联系入口 */
.contact-dock {
  position: fixed; left: 18px; bottom: 22px; z-index: 60;
  display: flex; flex-direction: column; gap: 10px;
}
.dock-btn {
  width: 46px; height: 46px; border-radius: 50%;
  display: grid; place-items: center;
  font-size: 20px; border: 0; cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: transform .2s ease, box-shadow .2s ease;
}
.dock-btn:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.dock-tel { background: var(--grad); color: #fff; }
.dock-mail { background: #fff; color: var(--c-ink); border: 1px solid var(--c-line); }
.dock-wechat { background: #22c55e; color: #fff; font-family: inherit; }

/* 轻提示 toast */
.toast {
  position: fixed; left: 50%; bottom: 90px; z-index: 80;
  transform: translate(-50%, 12px);
  background: rgba(15, 23, 42, .94); color: #fff;
  padding: 11px 20px; border-radius: 999px;
  font-size: 14px; font-weight: 600;
  box-shadow: var(--shadow-lg);
  opacity: 0; transition: opacity .25s ease, transform .25s ease;
  pointer-events: none;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* 入场动画 */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ===================== 子页横幅 ===================== */
.page-head {
  background: var(--grad-soft);
  padding: 54px 0 46px;
  border-bottom: 1px solid var(--c-line);
}
.crumbs { font-size: 13px; color: var(--c-muted); margin-bottom: 12px; }
.crumbs a { color: var(--c-primary); font-weight: 600; }
.page-head h1 { font-size: clamp(28px, 4vw, 40px); margin-bottom: 10px; }
.page-head p { color: var(--c-muted); margin: 0; }

/* 导航当前页高亮 */
.nav-links a.active {
  color: var(--c-primary);
  text-decoration: underline;
  text-underline-offset: 6px;
  text-decoration-thickness: 2px;
}

/* ===================== 服务详情 ===================== */
.svc-detail { display: grid; grid-template-columns: 1.45fr .85fr; gap: 36px; align-items: start; }
.svc-detail.reverse { grid-template-columns: .85fr 1.45fr; }
.svc-detail.reverse .svc-text { order: 2; }
.svc-detail.reverse .svc-meta { order: 1; }
.svc-text h2 { font-size: clamp(24px, 3vw, 32px); }
.svc-text > p { color: var(--c-muted); }
.svc-meta {
  background: var(--c-bg-alt); border: 1px solid var(--c-line);
  border-radius: var(--radius); padding: 24px;
}
.svc-meta h3 { font-size: 17px; }
.svc-meta ul { list-style: none; padding: 0; margin: 0 0 14px; }
.svc-meta li { position: relative; padding-left: 20px; margin-bottom: 8px; font-size: 15px; }
.svc-meta li::before { content: "•"; position: absolute; left: 4px; color: var(--c-primary); font-weight: 800; }
.meta-note { font-size: 14px; color: var(--c-muted); margin-bottom: 14px; }

/* ===================== 价格套餐 ===================== */
.price-card { position: relative; text-align: center; padding-top: 40px; display: flex; flex-direction: column; }
.price-card.featured { border: 2px solid var(--c-primary); box-shadow: var(--shadow-md); }
.price-badge {
  position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
  background: var(--grad); color: #fff; font-size: 12px; font-weight: 700;
  padding: 5px 14px; border-radius: 999px; white-space: nowrap;
}
.price { font-size: 38px; font-weight: 800; color: var(--c-ink); margin: 8px 0 4px; }
.price .cur { font-size: 20px; }
.price .unit { font-size: 14px; color: var(--c-muted); font-weight: 600; margin-left: 4px; }
.price-desc { font-size: 14px; color: var(--c-muted); }
.price-card .btn { margin-top: auto; }

/* ===================== 在线下单 ===================== */
.order-grid { display: grid; grid-template-columns: 1.35fr .85fr; gap: 32px; align-items: start; }
.order-form {
  background: #fff; border: 1px solid var(--c-line);
  border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow-sm);
}
.order-block { margin-bottom: 30px; }
.order-block:last-child { margin-bottom: 0; }
.block-title { display: flex; align-items: center; gap: 10px; font-size: 19px; margin-bottom: 16px; }
.step-dot {
  display: inline-grid; place-items: center; flex: none;
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--grad); color: #fff; font-size: 13px; font-weight: 800;
}
.mini-note { font-size: 13px; color: var(--c-muted); margin: 12px 0 0; }

/* 套餐 / 加购 选项 */
.pkg-grid, .addon-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.pkg-opt, .addon-opt { position: relative; cursor: pointer; }
.pkg-opt input, .addon-opt input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.pkg-body {
  display: flex; flex-direction: column; gap: 2px;
  border: 1px solid var(--c-line); border-radius: var(--radius-sm);
  padding: 12px 14px; font-size: 14px;
  transition: border-color .15s, background .15s;
}
.pkg-body b { color: var(--c-ink); }
.pkg-body i { font-style: normal; color: var(--c-primary); font-weight: 700; font-size: 13px; }
.addon-opt span {
  display: flex; justify-content: space-between; align-items: center; gap: 8px;
  border: 1px solid var(--c-line); border-radius: var(--radius-sm);
  padding: 11px 14px; font-size: 14px;
  transition: border-color .15s, background .15s;
}
.addon-opt em { font-style: normal; color: var(--c-primary); font-weight: 700; font-size: 13px; }
.pkg-opt input:checked + .pkg-body,
.addon-opt input:checked + span { border-color: var(--c-primary); background: var(--c-bg-soft); }
.pkg-opt input:focus-visible + .pkg-body,
.addon-opt input:focus-visible + span { outline: 2px solid var(--c-primary); outline-offset: 2px; }

/* 右侧摘要 / 支付 */
.order-side { position: sticky; top: 84px; display: grid; gap: 16px; }
.sum-card, .pay-card, .help-card {
  background: #fff; border: 1px solid var(--c-line);
  border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow-sm);
}
.sum-card h3, .pay-card h3, .help-card h3 { font-size: 17px; }
.sum-row { display: flex; justify-content: space-between; gap: 10px; font-size: 14px; padding: 8px 0; }
.sum-addons div { display: flex; justify-content: space-between; font-size: 13px; color: var(--c-muted); padding: 3px 0; }
.sum-total {
  display: flex; justify-content: space-between; align-items: center;
  border-top: 1px solid var(--c-line); margin-top: 10px; padding-top: 12px;
}
.sum-total b { font-size: 26px; color: var(--c-primary); }
.sum-note { font-size: 12px; color: var(--c-muted); margin: 8px 0 0; }
.pay-note { font-size: 13px; color: var(--c-muted); }
.pay-qrs { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.pay-qrs figure { margin: 0; text-align: center; }
.pay-qrs img { width: 100%; height: auto; border-radius: 12px; border: 1px solid var(--c-line); }
.pay-qrs figcaption { font-size: 12px; color: var(--c-muted); margin-top: 6px; }
.pay-bank { border-top: 1px solid var(--c-line); margin-top: 14px; padding-top: 12px; font-size: 13px; }
.help-card p { margin: 0 0 6px; font-size: 14px; }

/* ===================== 底部 CTA ===================== */
.cta-band { background: var(--grad-soft); padding: 64px 0; text-align: center; }
.cta-inner h2 { font-size: clamp(24px, 3vw, 32px); }
.cta-inner p { color: var(--c-muted); }
.cta-inner .hero-actions { justify-content: center; }

/* ===================== 杂项 ===================== */
.center-btn { text-align: center; margin-top: 32px; }
.text-link { color: var(--c-primary); font-weight: 700; font-size: 14px; }
.text-link:hover { text-decoration: underline; }
.case-result { margin-top: 10px; margin-bottom: 0; font-size: 14px; color: var(--c-primary-dark); }
.cases-note { text-align: center; font-size: 13px; color: var(--c-muted); margin-top: 26px; }
.contact-tip { margin-top: 18px; font-size: 14px; }
.about-copy h2 { font-size: 26px; }
.footer-contact { font-size: 13px; margin-top: 10px; }

/* ===================== 响应式 ===================== */
@media (max-width: 920px) {
  .svc-detail, .svc-detail.reverse { grid-template-columns: 1fr; }
  .svc-detail.reverse .svc-text, .svc-detail.reverse .svc-meta { order: initial; }
  .order-grid { grid-template-columns: 1fr; }
  .order-side { position: static; }
  .pkg-grid, .addon-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .price { font-size: 32px; }
  .pay-qrs { grid-template-columns: 1fr; }
  .order-form { padding: 20px; }
}

/* 桌面 → 平板 */
@media (max-width: 920px) {
  .hero-inner { grid-template-columns: 1fr; gap: 36px; }
  .hero-visual { min-height: 280px; order: -1; }
  .contact-grid { grid-template-columns: 1fr; gap: 32px; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 30px; }
}

@media (max-width: 768px) {
  .nav-links {
    position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: #fff; border-bottom: 1px solid var(--c-line);
    padding: 10px 20px 18px; box-shadow: var(--shadow-md);
    transform: translateY(-12px); opacity: 0; pointer-events: none;
    transition: transform .2s ease, opacity .2s ease;
  }
  .nav-links.open { transform: none; opacity: 1; pointer-events: auto; }
  .nav-links a { padding: 12px 4px; border-bottom: 1px solid var(--c-line); }
  .nav-links .nav-cta { border-bottom: 0; margin-top: 10px; text-align: center; }
  .nav-toggle { display: flex; }
  .cards-3 { grid-template-columns: 1fr; }
  .section { padding: 56px 0; }
  .hero { padding: 48px 0 60px; }
  .hero-trust { gap: 24px; }
}

@media (max-width: 480px) {
  .steps { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr; }
  .hero-actions .btn { width: 100%; }
  .contact-dock { left: 14px; bottom: 18px; }
  .dock-btn { width: 42px; height: 42px; font-size: 18px; }
  .toast { bottom: 78px; font-size: 13px; }
}

/* 无障碍：尊重减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; scroll-behavior: auto !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}