/* ==========================================================================
   煜苍官网 · 首页样式
   设计系统：品牌蓝阶 + 摄影优先版式 + 明暗区块交替 + 单一行动色
   --------------------------------------------------------------------------
   0. 变量与基础  1. 通用组件  2. 顶栏  3. 首屏  4. 数据带  5. 区块头
   6. 卡片/网格   7. 配图行   8. 合作路径  9. 会员档位  10. 资料下载
   11. 博客       12. 常见问题 13. 联系方式 14. 页脚  15. 弹窗/提示  16. 响应式
   ========================================================================== */

/* ---------- 0. 变量与基础 ---------- */
:root {
  /* 底色 */
  --canvas: #ffffff;
  --parchment: #f4f6fa;
  --pearl: #fafbfd;
  /* 文字 */
  --ink: #0b1834;
  --body: #46506a;
  --body-soft: #5b6580;
  --muted: #7b8499;
  --muted-2: #9aa3b8;
  --on-dark: #ffffff;
  --on-dark-1: #d6e1f5;
  --on-dark-2: #b7c8e6;
  --on-dark-3: #93a3c4;
  --on-dark-4: #9db8e4;
  /* 线条 */
  --hairline: #e2e7f0;
  --divider: #eef1f7;
  --field-bg: #f6f8fc;
  /* 品牌蓝 */
  --primary: #00419e;
  --primary-hover: #003278;
  --primary-dark: #002e70;
  --primary-mid: #2e6fc0;
  --primary-soft: #eef3fb;
  /* 橙（唯一重音，极小面积） */
  --accent: #fc7a02;
  --accent-ink: #dc5e00;
  --accent-soft: #fff1e5;
  /* 深色区块 */
  --dark: #0b1832;
  --dark-card: #12224a;
  --dark-footer: #08132b;
  --dark-line: #1a2743;
  /* 尺寸 */
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius: 20px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --container: 1200px;
  --section-y: 100px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
          "Noto Sans SC", "Microsoft YaHei", "Source Han Sans SC", system-ui, sans-serif;
  --shadow-card: 0 1px 2px rgba(11, 24, 52, .04), 0 14px 34px -18px rgba(11, 24, 52, .16);
  --shadow-lift: 0 2px 4px rgba(11, 24, 52, .05), 0 22px 44px -20px rgba(11, 24, 52, .22);
}

*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--body);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  margin: 0;
  color: var(--ink);
  font-weight: 600;
  line-height: 1.42;
}

p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
hr { border: 0; }

/* 兜底：任何带 hidden 属性的元素都不显示（.toast{display:flex} 会盖掉浏览器默认值） */
[hidden] { display: none !important; }

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  border-radius: 4px;
}

.container {
  width: min(var(--container), 100% - 48px);
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: 50%;
  top: -60px;
  transform: translateX(-50%);
  z-index: 200;
  padding: 10px 20px;
  border-radius: 0 0 12px 12px;
  background: var(--primary-dark);
  color: #fff;
  font-size: 14px;
  transition: top .2s;
}
.skip-link:focus { top: 0; }

/* ---------- 1. 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 30px;
  border: 0;
  border-radius: var(--radius-pill);
  font-size: 16px;
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color .18s, color .18s, border-color .18s, transform .18s, box-shadow .18s;
}
.btn:active { transform: scale(.97); }
.btn-sm { padding: 11px 22px; font-size: 14px; }
.btn-block { width: 100%; }

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

.btn-ghost {
  background: #fff;
  color: var(--primary);
  box-shadow: inset 0 0 0 1px #d6deeb;
}
.btn-ghost:hover { box-shadow: inset 0 0 0 1px var(--primary); }

.btn-mid { background: var(--primary-mid); color: #fff; }
.btn-mid:hover { background: #2560a8; }

.btn-on-dark { background: #fff; color: var(--primary-dark); }
.btn-on-dark:hover { background: #e8effa; }

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--primary);
  line-height: 1;
}
.eyebrow-on-dark { color: #6e9be0; }

.eyebrow-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.link-more {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  color: var(--primary);
  transition: opacity .18s;
}
.link-more::after {
  content: "";
  display: block;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .22s;
}
.link-more:hover::after { transform: scaleX(1); }
.link-on-dark { color: #6e9be0; }

.rule {
  margin: 0;
  height: 1px;
  background: var(--divider);
}

.icon-box {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  border-radius: 13px;
  background: var(--primary-soft);
  color: var(--primary);
}
.icon-box-sm { width: 44px; height: 44px; }

.badge {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.4;
}
.badge-accent { background: var(--accent-soft); color: var(--accent-ink); }
.badge-on-dark { background: var(--primary-mid); color: #fff; }

/* ---------- 2. 顶栏 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, .94);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--hairline);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}
.brand-mark {
  flex: 0 0 auto;
  width: 36px;
  height: 36px;
  object-fit: contain;
}
.brand-word {
  font-size: 21px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: .01em;
}
.brand-divider {
  width: 1px;
  height: 16px;
  background: var(--hairline);
}
.brand-sub {
  font-size: 14px;
  font-weight: 500;
  color: var(--primary);
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-list {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-list a {
  font-size: 15px;
  font-weight: 500;
  color: var(--body);
  transition: color .18s;
}
.nav-list a:hover { color: var(--primary); }
.nav-cta { display: none; }

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--hairline);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
}

/* ---------- 3. 首屏 ---------- */
.hero { padding: 80px 0; background: var(--canvas); }
.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 30px;
  text-align: center;
}
.hero-title {
  display: flex;
  flex-direction: column;
  font-size: clamp(34px, 4.5vw, 58px);
  line-height: 1.28;
  letter-spacing: -.01em;
}
.hero-title .accent { color: var(--primary); }
.hero-lead {
  max-width: 800px;
  font-size: 17px;
  line-height: 1.88;
  color: var(--body);
}
.hero-micro {
  font-size: 13px;
  color: var(--muted);
}
.hero-figure {
  width: 100%;
  margin: 0;
  overflow: hidden;
  border-radius: 28px;
  background: var(--parchment);
}
.hero-figure img {
  width: 100%;
  aspect-ratio: 1200 / 560;
  object-fit: cover;
}

/* ---------- 4. 数据带 ---------- */
.stat-band { background: var(--primary-dark); padding: 34px 0; }
.stat-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}
.stat b {
  font-size: 30px;
  font-weight: 600;
  color: #fff;
  line-height: 1.3;
}
.stat span { font-size: 13px; color: var(--on-dark-4); line-height: 1.5; }

/* ---------- 5. 区块头 ---------- */
.section { padding: var(--section-y) 0; }
.section-alt { background: var(--parchment); }
.section-dark { background: var(--dark); }
.section-primary { background: var(--primary-dark); }

.sec-head {
  max-width: 800px;
  margin-bottom: 52px;
}
.sec-head h2 {
  margin-top: 16px;
  font-size: clamp(28px, 3.2vw, 40px);
  line-height: 1.42;
}
.sec-desc {
  margin-top: 16px;
  font-size: 16px;
  line-height: 1.88;
  color: var(--body);
}
.sec-head-wide { max-width: 900px; }
.sec-head-center {
  margin-inline: auto;
  text-align: center;
}
.sec-head-center .eyebrow { justify-content: center; }

.section-dark .sec-head h2 { color: #fff; }
.section-dark .sec-desc { color: var(--on-dark-3); }

.head-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  max-width: none;
}
.head-row > div { max-width: 800px; }
.head-row .link-more { flex: 0 0 auto; padding-bottom: 6px; }

/* ---------- 6. 卡片与网格 ---------- */
.grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.grid-3, .grid-6 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
/* FAQ 展开后要能读，固定两列 */
.faq-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 30px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: #fff;
  transition: box-shadow .22s, transform .22s, border-color .22s;
}
.card:hover {
  transform: translateY(-2px);
  border-color: #d3dcea;
  box-shadow: var(--shadow-card);
}
.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.card h3 { font-size: 22px; line-height: 1.4; }
.card > p {
  font-size: 14px;
  line-height: 1.86;
  color: var(--body-soft);
}
.price {
  font-size: 15px;
  font-weight: 600;
  color: var(--primary);
  white-space: nowrap;
}

/* ---------- 7. 配图行 ---------- */
.figure-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 52px;
}
.figure-row figure { margin: 0; }
.figure-row img {
  width: 100%;
  aspect-ratio: 588 / 320;
  object-fit: cover;
  border-radius: var(--radius);
}
.figure-row figcaption {
  margin-top: 14px;
  font-size: 14px;
  color: var(--muted);
}

.wide-figure { margin: 52px 0 0; }
.wide-figure img {
  width: 100%;
  aspect-ratio: 1200 / 340;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

/* ---------- 8. 合作路径 ---------- */
.center-head .sec-head { max-width: 800px; }

.path-track {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.path-step {
  display: flex;
  flex: 1 1 0;
  min-width: 0;
  flex-direction: column;
  gap: 10px;
  padding: 22px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  background: #fff;
}
.path-tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  line-height: 1.5;
}
.path-step b {
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.45;
}
.path-step > span:last-child {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
}
.path-arrow {
  display: flex;
  flex: 0 0 20px;
  justify-content: center;
  color: var(--muted-2);
}

/* ---------- 9. 会员档位 ---------- */
.tier { gap: 16px; }
.tier h3 { font-size: 22px; }
.tier-price {
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.tier-price b {
  font-size: 38px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--primary);
}
.tier-price span { font-size: 14px; color: var(--muted); }
.tier-list {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  gap: 4px;
}
.tier-list li {
  font-size: 14px;
  line-height: 2;
  color: var(--body-soft);
}
.tier .btn { margin-top: 4px; }

.tier-dark {
  border-color: transparent;
  background: var(--primary-dark);
}
.tier-dark:hover { border-color: transparent; }
.tier-dark h3 { color: #fff; }
.tier-dark .tier-price b { color: #fff; }
.tier-dark .tier-price span { color: var(--on-dark-4); }
.tier-dark .rule { background: var(--primary-mid); }
.tier-dark .tier-list li { color: #c7d7f0; }

/* ---------- 10. 资料下载 ---------- */
.doc-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  border-radius: var(--radius);
  background: var(--dark-card);
}
.doc-cover { width: 100%; overflow: hidden; border-radius: var(--radius-sm); }
.doc-cover img {
  width: 100%;
  aspect-ratio: 344 / 220;
  object-fit: cover;
  transition: transform .5s;
}
.doc-card:hover .doc-cover img { transform: scale(1.03); }
.doc-tag {
  font-size: 12px;
  font-weight: 600;
  color: #6e9be0;
  line-height: 1.6;
}
.doc-card h3 {
  font-size: 17px;
  line-height: 1.55;
  color: #fff;
}
.doc-desc {
  font-size: 13px;
  line-height: 1.85;
  color: var(--on-dark-3);
  flex: 1 1 auto;
}

/* ---------- 11. 博客 ---------- */
.post-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
  padding: 16px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: #fff;
  transition: box-shadow .22s, transform .22s, border-color .22s;
}
.post-card:hover {
  transform: translateY(-2px);
  border-color: #d3dcea;
  box-shadow: var(--shadow-card);
}
.post-cover { width: 100%; overflow: hidden; border-radius: 14px; }
.post-cover img {
  width: 100%;
  aspect-ratio: 352 / 200;
  object-fit: cover;
  transition: transform .5s;
}
.post-card:hover .post-cover img { transform: scale(1.03); }
.post-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  line-height: 1.6;
}
.post-tag { font-weight: 600; color: var(--primary); }
.post-meta time { color: var(--muted-2); }
.post-card h3 { font-size: 18px; line-height: 1.55; }
.post-excerpt {
  font-size: 14px;
  line-height: 1.86;
  color: var(--body-soft);
  flex: 1 1 auto;
}

/* ---------- 12. 常见问题 ---------- */
.faq-item {
  align-self: start;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  background: #fff;
  overflow: hidden;
  transition: box-shadow .22s, border-color .22s;
}
.faq-item[open] {
  border-color: #d3dcea;
  box-shadow: var(--shadow-card);
}
.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 24px 26px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary i {
  position: relative;
  display: block;
  flex: 0 0 18px;
  width: 18px;
  height: 18px;
}
.faq-item summary i::before,
.faq-item summary i::after {
  content: "";
  position: absolute;
  background: var(--primary);
  border-radius: 2px;
  transition: transform .22s, opacity .22s;
}
.faq-item summary i::before { left: 0; top: 8.1px; width: 18px; height: 1.8px; }
.faq-item summary i::after { left: 8.1px; top: 0; width: 1.8px; height: 18px; }
.faq-item[open] summary i::after { transform: scaleY(0); opacity: 0; }
.faq-answer { padding: 0 26px 24px; }
.faq-answer p {
  font-size: 14px;
  line-height: 1.9;
  color: var(--body-soft);
}

/* ---------- 13. 联系方式 ---------- */
.contact-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 440px;
  gap: 72px;
  align-items: start;
}
.contact-copy { display: flex; flex-direction: column; gap: 24px; }
.contact-copy h2 {
  font-size: clamp(28px, 3.2vw, 40px);
  line-height: 1.42;
  color: #fff;
}
.contact-lead {
  font-size: 16px;
  line-height: 1.88;
  color: var(--on-dark-2);
}
.contact-points { display: flex; flex-direction: column; gap: 12px; }
.contact-points li {
  font-size: 15px;
  line-height: 1.8;
  color: var(--on-dark-1);
}

.qr-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-top: 16px;
}
.qr-slot {
  display: flex;
  flex: 0 0 150px;
  align-items: center;
  justify-content: center;
  width: 150px;
  height: 150px;
  padding: 6px;
  border-radius: 14px;
  background: #fff;
  font-size: 11px;
  line-height: 1.4;
  color: #a6aec0;
  text-align: center;
  overflow: hidden;
}
/* 二维码要留足物理尺寸才扫得出来，150px 是屏幕显示的下限 */
.qr-slot img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.qr-row div:last-child {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.qr-row b { font-size: 15px; font-weight: 600; color: #fff; }
.qr-row span { font-size: 13px; line-height: 1.7; color: var(--on-dark-4); }

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 32px;
  border-radius: var(--radius-lg);
  background: #fff;
}
.contact-form h3 { font-size: 22px; }

.field { display: flex; flex-direction: column; gap: 8px; }
.field label {
  font-size: 13px;
  font-weight: 500;
  color: var(--body-soft);
  line-height: 1.5;
}
.field input,
.field select {
  width: 100%;
  height: 48px;
  padding: 0 16px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  background: var(--field-bg);
  font-size: 14px;
  line-height: 48px;
  transition: border-color .18s, background-color .18s;
}
.field input::placeholder { color: #a6aec0; }
.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--primary);
  background: #fff;
}
.field .is-invalid {
  border-color: #d94b3d;
  background: #fdf5f4;
}
.select-wrap { position: relative; }
.select-wrap select {
  appearance: none;
  -webkit-appearance: none;
  padding-right: 44px;
  cursor: pointer;
}
.select-chevron {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: #8b94a8;
  pointer-events: none;
}
.form-note {
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted-2);
  text-align: center;
}

/* ---------- 14. 页脚 ---------- */
.site-footer {
  padding: 72px 0 32px;
  background: var(--dark-footer);
  color: var(--on-dark-3);
}
.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 176px 176px 176px;
  gap: 64px;
}
.footer-brand { display: flex; flex-direction: column; gap: 16px; }
.brand-mark-sm { width: 32px; height: 32px; }
.footer-brand .brand-word { font-size: 18px; color: #fff; }
.footer-brand p {
  max-width: 420px;
  font-size: 14px;
  line-height: 1.86;
  color: #8a96b4;
}
.footer-col h4 {
  margin-bottom: 14px;
  font-size: 13px;
  font-weight: 600;
  color: #fff;
}
.footer-col ul { display: flex; flex-direction: column; gap: 14px; }
.footer-col a {
  font-size: 14px;
  color: #8a96b4;
  transition: color .18s;
}
.footer-col a:hover { color: #fff; }

.footer-rule {
  margin: 40px 0 28px;
  height: 1px;
  background: var(--dark-line);
}
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  font-size: 12px;
  color: #5e6b8a;
}

/* ---------- 15. 弹窗与提示 ---------- */
.modal { position: fixed; inset: 0; z-index: 300; }
.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(8, 19, 43, .55);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
}
.modal-box {
  position: relative;
  width: min(440px, 100% - 40px);
  margin: 10vh auto 0;
  padding: 32px;
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: 0 30px 80px -30px rgba(8, 19, 43, .5);
  animation: modal-in .22s ease-out;
}
@keyframes modal-in {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: none; }
}
.modal-close {
  position: absolute;
  top: 18px;
  right: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: background-color .18s, color .18s;
}
.modal-close:hover { background: var(--field-bg); color: var(--ink); }
.modal-box h3 { font-size: 20px; line-height: 1.5; padding-right: 40px; }
.modal-sub {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}
.modal-box form {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-top: 24px;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  z-index: 400;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  transform: translateX(-50%);
  border-radius: var(--radius-pill);
  background: var(--ink);
  color: #fff;
  font-size: 14px;
  box-shadow: 0 18px 40px -16px rgba(8, 19, 43, .6);
  animation: toast-in .24s ease-out;
}
.toast svg { color: #5fd08a; }
@keyframes toast-in {
  from { opacity: 0; transform: translate(-50%, 12px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* ---------- 15b. 滚动进场与顶栏滚动态 ---------- */
.site-header.is-scrolled {
  box-shadow: 0 10px 26px -18px rgba(11, 24, 52, .38);
}

/* 仅在 JS 可用时隐藏，脚本失效则内容照常显示 */
.js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .62s cubic-bezier(.22, .61, .36, 1),
              transform .62s cubic-bezier(.22, .61, .36, 1);
  transition-delay: var(--reveal-delay, 0ms);
}
.js .reveal.is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 16. 响应式 ---------- */
@media (max-width: 1180px) {
  .nav-list { gap: 24px; }
  .contact-inner { gap: 48px; }
}

/* 导航多一项（论坛）后，1025–1180px 之间需要更紧凑的间距 */
@media (min-width: 1025px) and (max-width: 1180px) {
  .nav { gap: 20px; }
  .nav-list { gap: 16px; }
  .nav-list a { font-size: 14px; }
}

@media (max-width: 1024px) {
  :root { --section-y: 80px; }

  .nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 72px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 24px 24px;
    background: #fff;
    border-bottom: 1px solid var(--hairline);
    box-shadow: 0 20px 40px -24px rgba(11, 24, 52, .3);
  }
  .nav.open { display: flex; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-list a {
    display: block;
    padding: 14px 0;
    border-bottom: 1px solid var(--divider);
  }
  .nav-cta { display: inline-flex; margin-top: 20px; }
  .header-cta { display: none; }
  .menu-btn { display: inline-flex; }

  .grid-3,
  .grid-6 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-3 > :last-child:nth-child(odd) { grid-column: 1 / -1; }

  .contact-inner { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .contact-form { max-width: 520px; }

  .footer-top { grid-template-columns: minmax(0, 1fr) 176px 176px; gap: 40px; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .path-track {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .path-step { flex: 0 0 auto; width: 100%; }
  .path-arrow { transform: rotate(90deg); margin: 8px 0; align-self: center; }
}

@media (max-width: 760px) {
  :root { --section-y: 64px; }

  .container { width: min(var(--container), 100% - 40px); }
  .hero { padding: 56px 0; }
  .hero-inner { gap: 24px; }
  .hero-lead { font-size: 16px; }
  .hero-figure { border-radius: var(--radius); }
  .hero-figure img { aspect-ratio: 4 / 3; }

  .btn-row { flex-direction: column; align-items: stretch; width: 100%; }
  .btn-row .btn { width: 100%; }

  .stat-inner {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }
  .stat b { font-size: 24px; }

  .head-row { flex-direction: column; align-items: flex-start; gap: 20px; }

  .grid-3,
  .grid-6 { grid-template-columns: minmax(0, 1fr); }
  .grid-3 > :last-child:nth-child(odd) { grid-column: auto; }

  .figure-row { grid-template-columns: minmax(0, 1fr); gap: 28px; margin-top: 40px; }
  .card { padding: 24px; }
  .wide-figure { margin-top: 40px; }
  .wide-figure img { aspect-ratio: 16 / 9; }

  .footer-top { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 8px; }
  .qr-row { align-items: flex-start; }
}

@media (max-width: 420px) {
  .brand-divider,
  .brand-sub { display: none; }
  .brand-word { font-size: 19px; }
  .card h3 { font-size: 20px; }
  .tier-price b { font-size: 32px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    transition-duration: .001ms !important;
  }
  .card:hover,
  .post-card:hover { transform: none; }
}

/* ==========================================================================
   17. 营销区块
   转化顺序：痛点共鸣 → 不作为的代价 → 换判断框架 → 差异化 → 信任承诺
   设计原则沿用第 0 节：克制、具体、不靠热闹感；橙色仍只用于价格与稀缺提示
   ========================================================================== */

/* ---------- 17.1 痛点共鸣 ---------- */
.pain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(252px, 1fr));
  gap: 22px;
}
.pain-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 28px 24px 24px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-card);
}
.pain-card::before {
  content: "";
  position: absolute;
  left: 24px;
  top: 0;
  width: 34px;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: var(--primary-mid);
}
.pain-card h3 {
  font-size: 17px;
  line-height: 1.5;
  color: var(--ink);
}
.pain-card .pain-say {
  font-size: 15px;
  line-height: 1.8;
  font-weight: 600;
  color: var(--primary-dark);
}
.pain-card p {
  font-size: 14px;
  line-height: 1.88;
  color: var(--body-soft);
}

/* 对号入座清单：把「症状」落到具体行为 */
.pain-check {
  margin-top: 36px;
  padding: 30px 32px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--parchment);
}
.pain-check h3 { font-size: 16px; }
.pain-check .pain-check-sub {
  margin-top: 8px;
  font-size: 13px;
  color: var(--muted);
}
.pain-check ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(268px, 1fr));
  gap: 12px 30px;
  margin-top: 20px;
}
.pain-check li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--body);
}
.pain-check li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: .72em;
  width: 8px;
  height: 8px;
  border: 1.5px solid var(--muted-2);
  border-radius: 3px;
}
.pain-check li b { color: var(--ink); font-weight: 600; }

.punch-line {
  margin-top: 38px;
  text-align: center;
  font-size: clamp(20px, 2.5vw, 27px);
  font-weight: 600;
  line-height: 1.55;
  color: var(--ink);
  letter-spacing: -.01em;
}
.punch-line em { font-style: normal; color: var(--primary); }

/* ---------- 17.2 不作为的代价 ---------- */
.cost-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}
.cost-item {
  padding: 26px 24px;
  border: 1px solid var(--dark-line);
  border-radius: var(--radius);
  background: var(--dark-card);
}
.cost-tag {
  font-size: 12px;
  font-weight: 600;
  line-height: 1.6;
  color: #6e9be0;
}
.cost-item h3 {
  margin-top: 10px;
  font-size: 18px;
  line-height: 1.5;
  color: #fff;
}
.cost-item p {
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.86;
  color: var(--on-dark-3);
}
.cost-note {
  margin-top: 32px;
  text-align: center;
  font-size: 15px;
  line-height: 1.8;
  color: var(--on-dark-2);
}

/* ---------- 17.3 721 法则（换判断框架） ---------- */
.law-grid {
  display: grid;
  grid-template-columns: 1.45fr 1fr 1fr;
  gap: 24px;
  align-items: stretch;
}
.law-item {
  display: flex;
  flex-direction: column;
  padding: 30px 28px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: #fff;
}
.law-item.is-main {
  border-color: #cddcf1;
  background: var(--primary-soft);
}
/* 注意：下面两条必须比 .law-item p / .trust-item p 更具体，
   否则 42px 的数字和 15px 的承诺标题会被 14px 正文覆盖 */
.law-item .law-num {
  margin-top: 0;
  font-size: 42px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--primary);
}
.law-item h3 { margin-top: 14px; font-size: 17px; line-height: 1.5; }
.law-item p {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.86;
  color: var(--body-soft);
  flex: 1 1 auto;
}
.law-what {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--divider);
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}
.law-item.is-main .law-what { border-color: #d6e2f2; color: var(--body-soft); }

/* ---------- 17.4 差异化对比 ---------- */
.compare-wrap {
  margin-top: 8px;
  padding: 6px 22px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: #fff;
  overflow-x: auto;
}
.compare {
  width: 100%;
  border-collapse: collapse;
  min-width: 560px;
}
.compare th,
.compare td {
  padding: 17px 18px;
  text-align: left;
  font-size: 14.5px;
  line-height: 1.72;
  vertical-align: top;
  border-bottom: 1px solid var(--divider);
}
.compare thead th {
  padding-top: 20px;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  border-bottom: 1px solid var(--hairline);
}
.compare tbody tr:last-child td { border-bottom: 0; }
.compare .col-old { color: var(--muted); width: 44%; }
.compare .col-new { color: var(--ink); font-weight: 600; }
.compare .col-new::before {
  content: "✓";
  margin-right: 8px;
  color: var(--primary);
  font-weight: 700;
}

/* ---------- 17.5 信任与承诺 ---------- */
.trust-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(268px, 1fr));
  gap: 22px;
}
.trust-item {
  padding: 26px 24px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: #fff;
}
.trust-item .trust-k {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}
.trust-item .trust-k svg { flex: 0 0 auto; color: var(--primary); }
.trust-item p {
  margin-top: 12px;
  font-size: 13.5px;
  line-height: 1.86;
  color: var(--body-soft);
}
.trust-note {
  margin-top: 28px;
  padding: 20px 24px;
  border: 1px dashed var(--hairline);
  border-radius: var(--radius-sm);
  background: var(--pearl);
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 17.6 响应式 ---------- */
@media (max-width: 1024px) {
  .law-grid { grid-template-columns: minmax(0, 1fr); }
  .law-item.is-main { border-color: var(--hairline); }
}
@media (max-width: 760px) {
  .pain-check { padding: 24px 22px; }
  .pain-card { padding: 24px 20px 20px; }
  .compare-wrap { padding: 4px 14px; }
  .compare th, .compare td { padding: 13px 12px; font-size: 14px; }
  .law-item { padding: 24px 22px; }
  .law-num { font-size: 34px; }
}

/* ---------- 18. 产品体系（v2）：8 条产品线 / 14 个 SKU ---------- */
.pl-card { gap: 14px; }
.pl-card h3 { font-size: 20px; }

.pl-skus {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.pl-skus li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-top: 8px;
  border-top: 1px solid var(--divider);
  font-size: 13.5px;
  line-height: 1.65;
}
.pl-skus li:first-child { padding-top: 0; border-top: 0; }
.pl-skus .sku-name { color: var(--ink); font-weight: 600; }
.pl-skus .sku-name i { font-weight: 600; }
.pl-skus .sku-price {
  flex: 0 0 auto;
  color: var(--primary);
  font-weight: 600;
  text-align: right;
  white-space: nowrap;
}
.pl-flag {
  display: inline-block;
  margin-left: 6px;
  padding: 1px 7px;
  border-radius: var(--radius-pill);
  background: var(--accent-soft);
  color: var(--accent-ink);
  font-size: 11.5px;
  font-style: normal;
  white-space: nowrap;
}

.card > p.pl-sub {
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

.pl-note,
.law-note {
  margin-top: 28px;
  padding: 20px 24px;
  border: 1px dashed var(--hairline);
  border-radius: var(--radius-sm);
  background: var(--pearl);
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--muted);
}
.law-note { margin-top: 26px; background: #fff; }
.pl-note b { color: var(--ink); }
.law-note b { color: var(--primary); }