/* ============ 基础变量与重置 ============ */
:root {
  --primary: #1e40af;
  --primary-2: #2563eb;
  --dark: #0b1220;
  --dark-2: #101a30;
  --text: #1e293b;
  --muted: #64748b;
  --bg: #f8fafc;
  --card: #ffffff;
  --border: #e2e8f0;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  --grad: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

.container {
  width: min(1160px, 92%);
  margin: 0 auto;
}

/* ============ 导航栏 ============ */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: box-shadow 0.3s, border-color 0.3s;
}

.header.scrolled {
  border-color: var(--border);
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.06);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
}

.logo-mark {
  width: 40px;
  height: 34px;
  border-radius: 8px;
  background: #fff;
  padding: 3px 4px;
  display: grid;
  place-items: center;
}

.logo-mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.logo img.logo-full {
  height: 38px;
  width: auto;
  display: block;
}

/* 官方品牌 LOGO（横版 PNG）——页头 */
.logo img.logo-brand {
  height: 56px;
  width: auto;
  display: block;
  max-width: 240px;
}

/* 页脚里的品牌 LOGO 稍小 */
.footer .logo img.logo-brand {
  height: 80px;
  margin-bottom: 8px;
  background: #fff;
  border-radius: 10px;
  padding: 8px 10px;
}

/* ============ 二维码卡片组件 ============ */
/* 每组二维码 + 文案使用独立 wrapper、独立背景，分离感更强 */
.qr-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.qr-card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 14px;
  padding: 18px;
  text-align: center;
  transition: transform 0.25s, border-color 0.25s;
}

.qr-card:hover {
  border-color: rgba(96, 165, 250, 0.5);
  transform: translateY(-2px);
}

.qr-card img {
  width: 100%;
  max-width: 160px;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  background: #fff;
  border-radius: 10px;
  padding: 6px;
  margin: 0 auto 10px;
  display: block;
}

.qr-card b {
  color: #f1f5f9;
  font-size: 14px;
  display: block;
  margin-bottom: 4px;
}

.qr-card small {
  color: #94a3b8;
  font-size: 12.5px;
  line-height: 1.5;
  display: block;
}

/* 联系卡内的小二维码区（用于联系我们页 contact-info-card 底部） */
.contact-qr-block {
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px dashed rgba(255, 255, 255, 0.14);
}

.contact-qr-block h4 {
  color: #fff;
  font-size: 15px;
  margin-bottom: 16px;
}

.contact-qr-block .qr-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.contact-qr-block .qr-card img { max-width: 130px; }

/* ============ 二维码信息独立大卡（联系我们页，表单下方） ============ */
.qr-info-section {
  margin-top: 44px;
}

.qr-info-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 24px;
  align-items: stretch;
}

.qr-info-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 30px 26px;
  text-align: center;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.04);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.qr-info-card .ico {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  margin-bottom: 4px;
}

.qr-info-card.qr-wechat .ico { background: rgba(34, 197, 94, 0.12); color: #16a34a; }
.qr-info-card.qr-service .ico { background: rgba(30, 64, 175, 0.1); color: var(--primary); }

.qr-info-card img {
  width: 100%;
  max-width: 200px;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 8px;
  margin: 6px 0;
}

.qr-info-card h3 {
  font-size: 18px;
  margin-bottom: 2px;
}

.qr-info-card p {
  color: var(--muted);
  font-size: 14px;
  max-width: 240px;
}

/* 售后宝海报（整张竖版带图） */
.service-poster-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.04);
  display: flex;
  flex-direction: column;
}

.service-poster-card img {
  width: 100%;
  max-height: 520px;
  object-fit: contain;
  background: #f8fafc;
}

.service-poster-card .poster-body {
  padding: 20px 24px;
  border-top: 1px solid var(--border);
}

.service-poster-card h3 { font-size: 18px; margin-bottom: 6px; }

.service-poster-card p { color: var(--muted); font-size: 14px; line-height: 1.7; margin-bottom: 14px; }

/* ============ 带海报的维保/服务支持页 CTA（双栏） ============ */
.cta-with-poster {
  background:
    radial-gradient(600px 320px at 100% 0%, rgba(30, 58, 138, 0.45), transparent 60%),
    radial-gradient(500px 280px at 0% 100%, rgba(30, 64, 175, 0.35), transparent 60%),
    var(--dark);
  color: #fff;
  padding: 76px 0;
}

.cta-with-poster .cta-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 50px;
  align-items: center;
}

.cta-with-poster h2 { font-size: clamp(26px, 3.2vw, 34px); margin-bottom: 16px; color: #fff; }

.cta-with-poster .lead { color: #cbd5e1; font-size: 16px; line-height: 1.8; margin-bottom: 28px; }

.cta-with-poster .cta-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 36px; }

.cta-with-poster .service-merit {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.cta-with-poster .merit {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 16px 18px;
  font-size: 14px;
  color: #cbd5e1;
}

.cta-with-poster .merit b { display:block; color: #fff; margin-bottom: 4px; font-size: 14.5px; }

.cta-with-poster .poster-wrap {
  background: #fff;
  border-radius: 18px;
  padding: 6px;
  box-shadow: 0 30px 70px rgba(15, 23, 42, 0.35);
  max-width: 360px;
  margin: 0 auto;
}

.cta-with-poster .poster-wrap img {
  width: 100%;
  border-radius: 14px;
  display: block;
}

.logo span em {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 34px;
}

.nav-links a {
  font-size: 15px;
  color: var(--muted);
  position: relative;
  padding: 6px 0;
  transition: color 0.25s;
}

.nav-links a:hover { color: var(--text); }

.nav-links a.active { color: var(--primary); font-weight: 600; }

.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  border-radius: 2px;
  background: var(--grad);
}

.nav-cta {
  background: var(--grad);
  color: #fff !important;
  padding: 9px 22px;
  border-radius: 999px;
  font-weight: 600;
  transition: transform 0.25s, box-shadow 0.25s;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(30, 64, 175, 0.35);
}

.nav-cta.active::after { display: none; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 40px;
  height: 40px;
}

.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  margin: 0 auto;
  position: relative;
  transition: 0.3s;
}

.nav-toggle span::before { position: absolute; top: -7px; }
.nav-toggle span::after { position: absolute; top: 7px; }

.nav-toggle.open span { background: transparent; }
.nav-toggle.open span::before { top: 0; transform: rotate(45deg); }
.nav-toggle.open span::after { top: 0; transform: rotate(-45deg); }

/* ============ 页头横幅（内页通用） ============ */
.page-hero {
  background:
    radial-gradient(600px 300px at 85% -10%, rgba(30, 58, 138, 0.5), transparent 60%),
    radial-gradient(500px 260px at 10% 110%, rgba(30, 64, 175, 0.4), transparent 60%),
    var(--dark);
  color: #fff;
  text-align: center;
  padding: 84px 0 72px;
}

.page-hero h1 { font-size: 40px; margin-bottom: 12px; }

.page-hero p { color: #94a3b8; font-size: 17px; }

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: transform 0.25s, box-shadow 0.25s, background 0.25s;
}

.btn-primary {
  background: var(--grad);
  color: #fff;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(30, 64, 175, 0.4);
}

.btn-ghost {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.35);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

/* ============ 首页 Hero ============ */
.hero {
  background:
    radial-gradient(700px 340px at 80% -20%, rgba(30, 58, 138, 0.55), transparent 65%),
    radial-gradient(600px 300px at 5% 120%, rgba(30, 64, 175, 0.45), transparent 60%),
    var(--dark);
  color: #fff;
  overflow: hidden;
  position: relative;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(148, 163, 184, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.07) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 40%, #000 30%, transparent 75%);
}

.hero-inner {
  position: relative;
  padding: 130px 0 140px;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: #93c5fd;
  background: rgba(59, 130, 246, 0.14);
  border: 1px solid rgba(59, 130, 246, 0.4);
  padding: 6px 16px;
  border-radius: 999px;
  margin-bottom: 26px;
}

.hero h1 {
  font-size: clamp(34px, 5.2vw, 58px);
  line-height: 1.25;
  font-weight: 800;
  margin-bottom: 22px;
}

.hero h1 em {
  font-style: normal;
  background: linear-gradient(90deg, #93c5fd, #60a5fa);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  max-width: 640px;
  margin: 0 auto 38px;
  color: #94a3b8;
  font-size: 18px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 860px;
  margin: 80px auto 0;
  position: relative;
}

.stat {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: var(--radius);
  padding: 26px 12px;
}

.stat b {
  display: block;
  font-size: 34px;
  font-weight: 800;
  background: linear-gradient(90deg, #93c5fd, #60a5fa);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat span { color: #94a3b8; font-size: 14px; }

/* ============ 通用区块 ============ */
.section { padding: 90px 0; }

.section-head {
  text-align: center;
  max-width: 620px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  background: rgba(30, 64, 175, 0.08);
  padding: 5px 14px;
  border-radius: 999px;
  margin-bottom: 14px;
}

.section-head h2 {
  font-size: clamp(26px, 3.4vw, 36px);
  margin-bottom: 14px;
}

.section-head p { color: var(--muted); font-size: 16px; }

.bg-white { background: #fff; }

/* ============ 服务卡片 ============ */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 26px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 34px 28px;
  transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: rgba(30, 64, 175, 0.35);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 13px;
  background: rgba(30, 64, 175, 0.1);
  display: grid;
  place-items: center;
  margin-bottom: 20px;
  color: var(--primary);
}

.card-icon svg { width: 26px; height: 26px; }

.card h3 { font-size: 19px; margin-bottom: 10px; }

.card p { color: var(--muted); font-size: 14.5px; }

/* ============ 首页服务（深色区） ============ */
.services-dark {
  background: var(--dark);
  color: #fff;
}

.services-dark .section-tag {
  color: #93c5fd;
  background: rgba(59, 130, 246, 0.12);
}

.services-dark .section-head p { color: #94a3b8; }

.services-dark .card {
  background: var(--dark-2);
  border-color: rgba(148, 163, 184, 0.15);
}

.services-dark .card:hover {
  border-color: rgba(96, 165, 250, 0.5);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.services-dark .card h3 { color: #f1f5f9; }
.services-dark .card p { color: #94a3b8; }

.services-dark .card-icon {
  background: rgba(59, 130, 246, 0.15);
  color: #60a5fa;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  color: #60a5fa;
  font-size: 14px;
  font-weight: 600;
}

.card-link:hover { gap: 10px; }

/* ============ 关于我们（图文） ============ */
.about-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-img {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.about-content .section-tag { margin-bottom: 12px; }

.about-content h2 {
  font-size: clamp(26px, 3.4vw, 34px);
  margin-bottom: 18px;
}

.about-content > p {
  color: var(--muted);
  margin-bottom: 26px;
}

.about-points { display: grid; gap: 16px; margin-bottom: 34px; }

.about-points li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 15px;
}

.about-points .check {
  flex: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(30, 64, 175, 0.12);
  color: var(--primary);
  display: grid;
  place-items: center;
  margin-top: 3px;
}

.about-points svg { width: 13px; height: 13px; }

/* ============ 案例卡片 ============ */
.case-card {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--border);
  transition: transform 0.3s, box-shadow 0.3s;
}

.case-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}

.case-cover {
  aspect-ratio: 16 / 10;
  overflow: hidden;
}

.case-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s;
}

.case-card:hover .case-cover img { transform: scale(1.06); }

.case-body { padding: 22px 24px 26px; }

.case-body .tag {
  font-size: 12px;
  color: var(--primary);
  background: rgba(30, 64, 175, 0.08);
  padding: 3px 12px;
  border-radius: 999px;
  font-weight: 600;
}

.case-body h3 { margin: 12px 0 8px; font-size: 18px; }

.case-body p { color: var(--muted); font-size: 14px; }

/* ============ 联系 CTA 区 ============ */
.cta-band {
  background:
    radial-gradient(500px 260px at 90% 0%, rgba(30, 58, 138, 0.5), transparent 60%),
    radial-gradient(500px 260px at 5% 100%, rgba(30, 64, 175, 0.4), transparent 60%),
    var(--dark);
  color: #fff;
  text-align: center;
  padding: 84px 0;
}

.cta-band h2 { font-size: clamp(26px, 3.4vw, 36px); margin-bottom: 14px; }

.cta-band p { color: #94a3b8; margin-bottom: 34px; }

/* ============ 联系我们页 ============ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 40px;
  align-items: start;
}

.contact-info-card {
  background: var(--dark);
  color: #fff;
  border-radius: var(--radius);
  padding: 36px 32px;
}

.contact-info-card h3 { font-size: 20px; margin-bottom: 26px; }

.contact-line {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 22px;
}

.contact-line .ico {
  width: 40px;
  height: 40px;
  flex: none;
  border-radius: 11px;
  background: rgba(59, 130, 246, 0.15);
  color: #60a5fa;
  display: grid;
  place-items: center;
}

.contact-line .ico svg { width: 19px; height: 19px; }

.contact-line b { display: block; font-size: 14px; margin-bottom: 2px; }

.contact-line span { color: #94a3b8; font-size: 14px; }

.contact-form {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.field { margin-bottom: 18px; }

.field label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 7px;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 14.5px;
  font-family: inherit;
  color: var(--text);
  background: var(--bg);
  outline: none;
  transition: border-color 0.25s, box-shadow 0.25s;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.12);
}

.field textarea { resize: vertical; min-height: 130px; }

.form-note {
  margin-top: 16px;
  font-size: 14px;
  color: #16a34a;
  display: none;
}

.form-note.show { display: block; }

/* ============ 页脚 ============ */
.footer {
  background: var(--dark);
  color: #94a3b8;
  padding: 70px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr 1.1fr 1.2fr;
  gap: 28px;
  padding-bottom: 50px;
}

.footer .logo { color: #fff; margin-bottom: 18px; }

.footer-about p { font-size: 14px; max-width: 300px; }

.footer h4 {
  color: #f1f5f9;
  font-size: 15px;
  margin-bottom: 18px;
}

.footer-links li { margin-bottom: 11px; }

.footer-links a { font-size: 14px; transition: color 0.25s; }

.footer-links a:hover { color: #60a5fa; }

.footer-contact li {
  font-size: 14px;
  margin-bottom: 11px;
}

.footer-bottom {
  border-top: 1px solid rgba(148, 163, 184, 0.15);
  padding: 22px 0;
  text-align: center;
  font-size: 13px;
}

/* 备案号链接：与页脚文字同色，悬停变主题蓝 */
.footer-bottom a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s;
}

.footer-bottom a:hover {
  color: var(--primary, #2563eb);
}

/* ============ 页脚里的二维码卡片（竖排：图在上，文字在下） ============ */
.footer .qr-row {
  grid-template-columns: 1fr;
  gap: 14px;
}

.footer .qr-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 14px 10px 12px;
  text-align: center;
  display: block;
  height: auto;
}

.footer .qr-card img {
  width: 100%;
  max-width: 110px;
  height: auto !important;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  background: #fff;
  border-radius: 8px;
  padding: 5px;
  margin: 0 auto 8px;
  display: block;
  box-sizing: border-box;
}

.footer .qr-card b {
  font-size: 13px;
  margin-bottom: 2px;
  display: block;
  color: #f1f5f9;
  white-space: nowrap;
}

.footer .qr-card small {
  font-size: 11.5px;
  line-height: 1.5;
  color: #94a3b8;
}

/* 步骤编号（流程类卡片） */
.step-no {
  display: inline-block;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--primary);
  margin-bottom: 10px;
}

/* 常见问题手风琴 */
.faq {
  max-width: 800px;
  margin: 0 auto;
}

.faq details {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 18px 22px;
  margin-bottom: 12px;
  transition: border-color 0.25s, box-shadow 0.25s;
}

.faq details[open] {
  border-color: var(--primary);
  box-shadow: 0 6px 18px rgba(30, 64, 175, 0.08);
}

.faq summary {
  font-weight: 600;
  color: #1e293b;
  cursor: pointer;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: '+';
  float: right;
  font-size: 20px;
  line-height: 1;
  color: var(--primary);
  transition: transform 0.25s;
}

.faq details[open] summary::after {
  content: '−';
}

.faq details p {
  margin-top: 10px;
  font-size: 14.5px;
  color: var(--muted);
}

/* ============ 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: none;
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* ============ 响应式 ============ */
@media (max-width: 1180px) {
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr 1.1fr 1.2fr; }
  .footer-grid > div:nth-child(6) { grid-column: span 2; }
  .qr-info-grid { grid-template-columns: 1fr; }
  .cta-with-poster .cta-grid { grid-template-columns: 1fr; gap: 40px; }
  .cta-with-poster .poster-wrap { max-width: 340px; margin: 0 auto; }
}

@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid > div:nth-child(n) { grid-column: auto; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .qr-row { grid-template-columns: 1fr 1fr; gap: 12px; }
}

@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .hero-inner { padding: 90px 0 100px; }
  .section { padding: 64px 0; }
  .page-hero { padding: 60px 0 52px; }
  .page-hero h1 { font-size: 30px; }

  .footer-grid { grid-template-columns: 1fr; }
  .qr-row { grid-template-columns: 1fr; }
  .cta-with-poster .service-merit { grid-template-columns: 1fr; }
  .logo img.logo-brand { height: 44px; max-width: 180px; }
  .cta-with-poster { padding: 60px 0; }
  .qr-info-card { padding: 24px 18px; }

  .nav-toggle { display: block; }

  .nav-links {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 20px 30px rgba(15, 23, 42, 0.1);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
  }

  .nav-links.open { max-height: 420px; }

  .nav-links a {
    padding: 15px 6%;
    border-top: 1px solid var(--border);
    font-size: 15.5px;
  }

  .nav-cta {
    margin: 14px 6%;
    text-align: center;
    border-top: none;
  }
}