/* ============================================================
   中导物联 · 物联网官网 全站共享样式
   深色科技风 / 玻璃拟态 / 青蓝渐变高亮 / 响应式
   无外部依赖，file:// 与 http(s) 均可正常使用
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root {
  --c-primary: #38bdf8;
  --c-accent: #22d3ee;
  --c-bg-deep: #0a1628;
  --c-bg: #0f2137;
  --c-card: rgba(255, 255, 255, 0.04);
  --c-card-border: rgba(56, 189, 248, 0.16);
  --c-text: #e2e8f0;
  --c-text-dim: #94a3b8;
  --c-success: #4ade80;
  --c-error: #f87171;
  --c-warning: #fbbf24;
  --grad-primary: linear-gradient(135deg, #38bdf8 0%, #22d3ee 100%);
  --grad-bg: linear-gradient(180deg, #0a1628 0%, #0f2137 100%);
  --grad-line: linear-gradient(90deg, transparent, rgba(56, 189, 248, 0.45), transparent);
  --shadow-glow: 0 0 24px rgba(56, 189, 248, 0.25);
  --radius: 14px;
  --nav-h: 68px;
  --font: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", system-ui, -apple-system, sans-serif;
}

/* ---------- 基础重置 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 12px); }
body {
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-bg-deep);
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; }
::selection { background: rgba(56, 189, 248, 0.35); color: #fff; }

/* 细滚动条 */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: #0a1628; }
::-webkit-scrollbar-thumb { background: #1e3a5f; border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: #2b4f7e; }

/* ---------- 布局工具 ---------- */
.container { width: min(1200px, 92%); margin: 0 auto; }
.section { padding: 88px 0; position: relative; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section-tag {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--c-primary);
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: 999px;
  padding: 4px 16px;
  margin-bottom: 16px;
  background: rgba(56, 189, 248, 0.06);
}
.section-title { font-size: 34px; font-weight: 700; line-height: 1.3; }
.section-title em {
  font-style: normal;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.section-desc { margin-top: 14px; color: var(--c-text-dim); font-size: 16px; }
.divider { height: 1px; background: var(--grad-line); border: 0; margin: 0; }

/* ---------- 顶部导航 ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--nav-h);
  z-index: 100;
  display: flex;
  align-items: center;
  transition: background 0.3s, box-shadow 0.3s, border-color 0.3s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(10, 22, 40, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: rgba(56, 189, 248, 0.14);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}
.nav-inner { width: min(1200px, 92%); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 10px; font-size: 19px; font-weight: 700; letter-spacing: 1px; }
.brand svg { flex: none; }
.brand span b {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 15px;
  color: var(--c-text-dim);
  transition: color 0.2s, background 0.2s;
  position: relative;
}
.nav-links a:hover { color: var(--c-text); background: rgba(255, 255, 255, 0.05); }
.nav-links a.active { color: var(--c-primary); }
.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 16px; right: 16px; bottom: 2px;
  height: 2px;
  border-radius: 2px;
  background: var(--grad-primary);
}
.nav-cta {
  margin-left: 10px;
  padding: 9px 20px !important;
  background: var(--grad-primary);
  color: #04222e !important;
  font-weight: 600;
  border-radius: 8px;
  box-shadow: var(--shadow-glow);
  transition: transform 0.2s, box-shadow 0.2s !important;
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 0 32px rgba(56, 189, 248, 0.45); background: var(--grad-primary) !important; }
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  padding: 8px;
}
.nav-toggle span { width: 24px; height: 2px; background: var(--c-text); border-radius: 2px; transition: 0.25s; }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero 首屏 ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-h) + 48px) 0 80px;
  background: var(--grad-bg);
  overflow: hidden;
}
#hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 50% at 70% 30%, rgba(34, 211, 238, 0.12), transparent 60%),
              radial-gradient(ellipse 50% 40% at 15% 80%, rgba(56, 189, 248, 0.08), transparent 60%);
  pointer-events: none;
}
.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--c-accent);
  border: 1px solid rgba(34, 211, 238, 0.3);
  background: rgba(34, 211, 238, 0.07);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 22px;
}
.hero-badge i { width: 7px; height: 7px; border-radius: 50%; background: var(--c-success); box-shadow: 0 0 8px var(--c-success); animation: pulse 2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }
.hero h1 { font-size: 46px; line-height: 1.22; font-weight: 700; letter-spacing: 1px; }
.hero h1 .grad {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub { margin: 22px 0 34px; font-size: 17px; color: var(--c-text-dim); max-width: 560px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; }
.hero-visual { position: relative; }
.hero-visual svg { width: 100%; height: auto; filter: drop-shadow(0 0 30px rgba(56, 189, 248, 0.18)); }
.float-node { animation: floaty 5s ease-in-out infinite; transform-origin: center; }
.float-node:nth-of-type(2) { animation-delay: 1.2s; }
.float-node:nth-of-type(3) { animation-delay: 2.1s; }
@keyframes floaty { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
.dash-line { stroke-dasharray: 6 6; animation: dashmove 3s linear infinite; }
@keyframes dashmove { to { stroke-dashoffset: -24; } }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 600;
  border: 0;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
  position: relative;
  overflow: hidden;
}
.btn-primary {
  background: var(--grad-primary);
  color: #04222e;
  box-shadow: var(--shadow-glow);
}
.btn-primary::after {
  content: "";
  position: absolute;
  top: 0; left: -80%;
  width: 60%; height: 100%;
  background: linear-gradient(105deg, transparent, rgba(255, 255, 255, 0.5), transparent);
  transform: skewX(-20deg);
  transition: left 0.5s;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 34px rgba(56, 189, 248, 0.45); }
.btn-primary:hover::after { left: 120%; }
.btn-ghost {
  background: rgba(255, 255, 255, 0.05);
  color: var(--c-text);
  border: 1px solid rgba(56, 189, 248, 0.35);
}
.btn-ghost:hover { background: rgba(56, 189, 248, 0.12); border-color: var(--c-primary); transform: translateY(-2px); }
.btn-sm { padding: 9px 22px; font-size: 14px; }

/* ---------- 卡片通用（玻璃拟态） ---------- */
.card {
  background: var(--c-card);
  border: 1px solid var(--c-card-border);
  border-radius: var(--radius);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 30px;
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
  position: relative;
  overflow: hidden;
}
.card:hover {
  transform: translateY(-6px);
  border-color: rgba(56, 189, 248, 0.45);
  box-shadow: 0 16px 44px rgba(2, 8, 20, 0.6), 0 0 0 1px rgba(56, 189, 248, 0.12);
}
.card-icon {
  width: 52px; height: 52px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  margin-bottom: 18px;
}
.card h3 { font-size: 19px; margin-bottom: 10px; }
.card p { color: var(--c-text-dim); font-size: 14.5px; }

/* ---------- 网格布局 ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }

/* ---------- 解决方案 / 场景 ---------- */
.solution-card { display: flex; flex-direction: column; gap: 14px; }
.solution-card ul { display: flex; flex-wrap: wrap; gap: 8px; }
.solution-card li {
  font-size: 12.5px;
  color: var(--c-accent);
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.22);
  padding: 3px 12px;
  border-radius: 999px;
}

/* ---------- CTA 条 ---------- */
.cta-band {
  position: relative;
  border-radius: 20px;
  padding: 64px 48px;
  text-align: center;
  background:
    radial-gradient(circle at 20% 20%, rgba(56, 189, 248, 0.18), transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(34, 211, 238, 0.14), transparent 50%),
    rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(56, 189, 248, 0.25);
  overflow: hidden;
}
.cta-band h2 { font-size: 30px; margin-bottom: 14px; }
.cta-band p { color: var(--c-text-dim); margin-bottom: 30px; }
.cta-actions { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }

/* ---------- 下载中心 ---------- */
.page-hero {
  padding: calc(var(--nav-h) + 72px) 0 64px;
  background: var(--grad-bg);
  position: relative;
  overflow: hidden;
  text-align: center;
}
.page-hero::before {
  content: "";
  position: absolute; inset: 0;
  background-image: linear-gradient(rgba(56, 189, 248, 0.05) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(56, 189, 248, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 30%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 70% at 50% 30%, #000 30%, transparent 75%);
}
.page-hero > * { position: relative; }
.page-hero h1 { font-size: 38px; }
.page-hero p { color: var(--c-text-dim); margin-top: 12px; }
.crumb { font-size: 13px; color: var(--c-text-dim); margin-bottom: 18px; }
.crumb a:hover { color: var(--c-primary); }

.dl-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.dl-card { display: flex; flex-direction: column; padding: 36px; }
.dl-card .os-icon { width: 60px; height: 60px; margin-bottom: 20px; }
.dl-card .os-badge {
  position: absolute; top: 20px; right: 20px;
  font-size: 12px; color: var(--c-success);
  border: 1px solid rgba(74, 222, 128, 0.35);
  background: rgba(74, 222, 128, 0.08);
  padding: 3px 12px; border-radius: 999px;
}
.dl-card h3 { font-size: 21px; margin-bottom: 6px; }
.dl-version { font-size: 14px; color: var(--c-text-dim); margin-bottom: 18px; }
.dl-version b { color: var(--c-primary); font-weight: 600; }
.dl-meta { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 20px; margin-bottom: 22px; font-size: 13.5px; }
.dl-meta div { display: flex; justify-content: space-between; border-bottom: 1px dashed rgba(148, 163, 184, 0.18); padding-bottom: 6px; }
.dl-meta span { color: var(--c-text-dim); }
.dl-notes { flex: 1; margin-bottom: 26px; }
.dl-notes h4 { font-size: 14px; color: var(--c-text); margin-bottom: 10px; }
.dl-notes li { font-size: 13.5px; color: var(--c-text-dim); padding-left: 18px; position: relative; margin-bottom: 6px; }
.dl-notes li::before { content: ""; position: absolute; left: 2px; top: 9px; width: 6px; height: 6px; border-radius: 50%; background: var(--c-primary); }
.dl-card .btn { justify-content: center; }
.dl-card .btn[data-placeholder="true"] { opacity: 0.75; }

.qr-block {
  display: flex; align-items: center; gap: 20px;
  margin-top: 28px; padding: 22px 26px;
  border: 1px dashed rgba(56, 189, 248, 0.35);
  border-radius: var(--radius);
  background: rgba(56, 189, 248, 0.04);
}
.qr-fake {
  width: 108px; height: 108px; flex: none;
  border-radius: 10px;
  background:
    repeating-linear-gradient(0deg, #0a1628 0 8px, transparent 8px 16px),
    repeating-linear-gradient(90deg, #0a1628 0 8px, #38bdf8 8px 10px, #0a1628 10px 18px);
  border: 3px solid #e2e8f0;
  image-rendering: pixelated;
  position: relative;
}
.qr-fake::before, .qr-fake::after,
.qr-fake i, .qr-fake u {
  content: ""; position: absolute; width: 24px; height: 24px;
  border: 5px solid #0a1628; background: #e2e8f0;
}
.qr-fake::before { top: 4px; left: 4px; }
.qr-fake::after { top: 4px; right: 4px; }
.qr-fake i { bottom: 4px; left: 4px; }
.qr-fake u { bottom: 4px; right: 4px; width: 14px; height: 14px; border-width: 4px; background: transparent; }
.qr-block h4 { font-size: 16px; margin-bottom: 6px; }
.qr-block p { font-size: 13.5px; color: var(--c-text-dim); }

/* ---------- FAQ 手风琴 ---------- */
.faq-list { max-width: 860px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.faq-item { padding: 0; overflow: hidden; }
.faq-item:hover { transform: none; border-color: rgba(56, 189, 248, 0.4); }
.faq-q {
  width: 100%;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  background: none; border: 0; color: var(--c-text);
  text-align: left; font-size: 16px; font-weight: 600;
  padding: 22px 26px;
}
.faq-q .arrow { flex: none; transition: transform 0.3s; color: var(--c-primary); }
.faq-item.open .faq-q .arrow { transform: rotate(180deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.35s ease; }
.faq-a-inner { padding: 0 26px 24px; color: var(--c-text-dim); font-size: 14.5px; }

/* ---------- 联系卡片 / 表单 ---------- */
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 64px; }
.contact-card { text-align: center; }
.contact-card .card-icon { margin: 0 auto 16px; }
.contact-card strong { display: block; font-size: 16px; margin-bottom: 6px; }
.contact-card a, .contact-card p { color: var(--c-text-dim); font-size: 14.5px; }
.contact-card a:hover { color: var(--c-primary); }

.form-card { max-width: 720px; margin: 0 auto; padding: 40px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; margin-bottom: 8px; color: var(--c-text); }
.form-group label i { color: var(--c-error); font-style: normal; margin-left: 2px; }
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  background: rgba(10, 22, 40, 0.6);
  border: 1px solid rgba(148, 163, 184, 0.25);
  border-radius: 10px;
  color: var(--c-text);
  font-size: 15px;
  font-family: inherit;
  padding: 12px 14px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-err { font-size: 12.5px; color: var(--c-error); margin-top: 6px; display: none; }
.form-group.invalid input, .form-group.invalid select, .form-group.invalid textarea { border-color: var(--c-error); }
.form-group.invalid .form-err { display: block; }

/* ---------- 时间轴（关于我们） ---------- */
.timeline { position: relative; max-width: 760px; margin: 0 auto; padding-left: 34px; }
.timeline::before {
  content: "";
  position: absolute; left: 8px; top: 6px; bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-primary), rgba(56, 189, 248, 0.05));
}
.timeline-item { position: relative; padding-bottom: 40px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: "";
  position: absolute; left: -33px; top: 6px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--c-bg-deep);
  border: 3px solid var(--c-primary);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.5);
}
.timeline-item time { font-size: 13px; color: var(--c-primary); letter-spacing: 1px; }
.timeline-item h3 { font-size: 18px; margin: 6px 0; }
.timeline-item p { color: var(--c-text-dim); font-size: 14.5px; }

/* ---------- 页脚 ---------- */
.footer {
  background: #081120;
  border-top: 1px solid rgba(56, 189, 248, 0.12);
  padding: 64px 0 0;
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 48px; }
.footer h4 { font-size: 15px; margin-bottom: 18px; color: var(--c-text); }
.footer-links li { margin-bottom: 10px; }
.footer-links a { font-size: 14px; color: var(--c-text-dim); transition: color 0.2s; }
.footer-links a:hover { color: var(--c-primary); }
.footer p, .footer address { font-size: 14px; color: var(--c-text-dim); font-style: normal; line-height: 1.9; }
.footer .footer-brand { margin-bottom: 16px; }
.footer-contact li { display: flex; gap: 10px; margin-bottom: 12px; font-size: 14px; color: var(--c-text-dim); align-items: flex-start; }
.footer-contact svg { flex: none; margin-top: 4px; }
.footer-contact a:hover { color: var(--c-primary); }
.footer-bottom {
  border-top: 1px solid rgba(148, 163, 184, 0.12);
  padding: 22px 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--c-text-dim);
}
.footer-bottom a:hover { color: var(--c-primary); }
.beian-links { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.beian-links a { display: inline-flex; align-items: center; gap: 6px; }

/* ---------- 回到顶部 ---------- */
.back-top {
  position: fixed;
  right: 28px; bottom: 32px;
  width: 46px; height: 46px;
  border-radius: 12px;
  border: 1px solid rgba(56, 189, 248, 0.35);
  background: rgba(15, 33, 55, 0.85);
  backdrop-filter: blur(8px);
  color: var(--c-primary);
  display: grid;
  place-items: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: 0.3s;
  z-index: 90;
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { background: var(--grad-primary); color: #04222e; }

/* ---------- Toast ---------- */
.toast-wrap { position: fixed; top: calc(var(--nav-h) + 16px); left: 50%; transform: translateX(-50%); z-index: 200; display: flex; flex-direction: column; gap: 10px; }
.toast {
  display: flex; align-items: center; gap: 10px;
  background: rgba(15, 33, 55, 0.92);
  border: 1px solid rgba(56, 189, 248, 0.4);
  border-radius: 10px;
  padding: 12px 22px;
  font-size: 14.5px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
  animation: toastIn 0.3s ease;
  backdrop-filter: blur(10px);
}
.toast.success { border-color: rgba(74, 222, 128, 0.5); }
.toast.error { border-color: rgba(248, 113, 113, 0.5); }
@keyframes toastIn { from { opacity: 0; transform: translateY(-14px); } to { opacity: 1; transform: translateY(0); } }

/* ---------- 滚动显现动画 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-d1 { transition-delay: 0.1s; }
.reveal-d2 { transition-delay: 0.2s; }
.reveal-d3 { transition-delay: 0.3s; }
.reveal-d4 { transition-delay: 0.4s; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero h1 { font-size: 38px; }
  .hero-visual { max-width: 520px; margin: 0 auto; }
}
@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .section-title { font-size: 27px; }
  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    background: rgba(10, 22, 40, 0.97);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(56, 189, 248, 0.15);
    padding: 14px 4%;
    gap: 2px;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 13px 14px; font-size: 16px; }
  .nav-links a.active::after { display: none; }
  .nav-cta { margin-left: 0; text-align: center; justify-content: center; }
  .nav-toggle { display: flex; }
  .hero { min-height: auto; }
  .hero h1 { font-size: 30px; }
  .hero-sub { font-size: 15px; }
  .grid-3, .grid-2, .dl-grid, .contact-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .form-card { padding: 26px 20px; }
  .dl-card { padding: 26px 22px; }
  .cta-band { padding: 44px 22px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { justify-content: center; text-align: center; }
  .qr-block { flex-direction: column; text-align: center; }
  .back-top { right: 16px; bottom: 20px; }
}

/* ---------- 无障碍：减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 打印 ---------- */
@media print {
  .nav, .back-top, #hero-canvas, .toast-wrap { display: none !important; }
  body { background: #fff; color: #000; }
}