/* ==========================================================================
   兔程·智慧编程 —— 少儿编程培训官网 全站样式
   --------------------------------------------------------------------------
   【替换点】品牌主色与辅助色集中在下方 :root 设计令牌中，改色即可全站生效。
   零外部依赖：不引入任何 CDN 字体 / 图标库 / 框架，断网环境同样可用。
   断点：≥1200 桌面 / 992-1199 收窄 / 768-991 双列 / <768 单列+汉堡导航
   ========================================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root {
  /* 品牌色 */
  --brand: #FF7A45;            /* 活力橙：主按钮 / CTA */
  --brand-600: #F2662F;
  --brand-soft: #FFF0E8;
  --sun: #FFB020;              /* 暖黄：点缀 / 高亮 */
  --sun-soft: #FFF6E0;
  --mint: #21C7A8;             /* 薄荷绿：赛道一 / 成功态 */
  --mint-soft: #E6F9F4;
  --sky: #3B82F6;              /* 天蓝：赛道二 / 链接 */
  --sky-soft: #EAF2FF;
  --violet: #8B5CF6;           /* 紫：赛道三 / 信奥 */
  --violet-soft: #F3EEFF;

  /* 中性色 */
  --bg: #FFF9F2;               /* 页面奶白底 */
  --bg-soft: #FFF3E6;
  --card: #FFFFFF;
  --ink: #2B2B3A;              /* 主文字 */
  --muted: #6B7280;            /* 次级文字 */
  --line: #F0E7DC;             /* 分割线 */
  --ok: #22C55E;
  --warn: #F59E0B;
  --err: #EF4444;

  /* 形态 */
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 22px;
  --r-xl: 28px;
  --shadow-sm: 0 2px 10px rgba(43, 43, 58, .06);
  --shadow-md: 0 10px 30px rgba(255, 122, 69, .12);
  --shadow-lg: 0 18px 44px rgba(43, 43, 58, .12);
  --shadow-brand: 0 10px 24px rgba(255, 122, 69, .32);

  /* 字体 */
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", system-ui, -apple-system, sans-serif;

  /* 布局 */
  --container: 1180px;
  --header-h: 72px;
}

/* ---------- 2. 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, p, ul, ol, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; border: 0; background: none; cursor: pointer; color: inherit; }
input, select, textarea { font: inherit; color: inherit; }

:focus-visible { outline: 3px solid rgba(255, 122, 69, .45); outline-offset: 2px; border-radius: 6px; }

::selection { background: rgba(255, 176, 32, .35); }

/* ---------- 3. 布局工具 ---------- */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 20px; }

.section { padding: 78px 0; }
.section--soft { background: var(--bg-soft); }
.section--white { background: var(--card); }

.section-head { text-align: center; max-width: 720px; margin: 0 auto 46px; }
.section-head .eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 14px; font-weight: 700; letter-spacing: .12em;
  color: var(--brand); background: var(--brand-soft);
  padding: 6px 14px; border-radius: 999px; margin-bottom: 14px;
}
.section-head h2 { font-size: 34px; font-weight: 800; line-height: 1.3; letter-spacing: -.01em; }
.section-head p { color: var(--muted); margin-top: 12px; font-size: 17px; }

.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px; border-radius: 999px;
  font-size: 16px; font-weight: 700; line-height: 1.2;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--primary { background: linear-gradient(135deg, #FF8B5C, var(--brand) 55%, #F2662F); color: #fff; box-shadow: var(--shadow-brand); }
.btn--primary:hover { box-shadow: 0 14px 30px rgba(255, 122, 69, .42); }

.btn--ghost { background: #fff; color: var(--ink); border: 2px solid var(--line); box-shadow: var(--shadow-sm); }
.btn--ghost:hover { border-color: var(--brand); color: var(--brand-600); }

.btn--mint { background: linear-gradient(135deg, #35D6B8, var(--mint)); color: #fff; box-shadow: 0 10px 24px rgba(33, 199, 168, .3); }

.btn--lg { padding: 16px 34px; font-size: 17px; }
.btn--block { width: 100%; }

/* ---------- 5. 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 60;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header .inner {
  height: var(--header-h);
  display: flex; align-items: center; gap: 24px;
}

.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; letter-spacing: -.01em; }
.brand .logo { width: 40px; height: 40px; flex: none; }
.brand small { display: block; font-size: 11px; font-weight: 600; color: var(--muted); letter-spacing: .2em; line-height: 1; margin-top: 3px; }

.nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav a {
  position: relative; padding: 9px 15px; border-radius: 999px;
  font-size: 15.5px; font-weight: 600; color: var(--ink);
  transition: color .16s ease, background .16s ease;
}
.nav a:hover { color: var(--brand-600); background: var(--brand-soft); }
.nav a.is-active { color: var(--brand-600); background: var(--brand-soft); }
.nav a.is-active::after {
  content: ""; position: absolute; left: 50%; bottom: 2px; transform: translateX(-50%);
  width: 16px; height: 3px; border-radius: 3px; background: var(--brand);
}

.nav-cta { margin-left: 8px; }

.nav-toggle { display: none; width: 46px; height: 46px; border-radius: 12px; align-items: center; justify-content: center; }
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: ""; display: block; width: 22px; height: 2.5px; border-radius: 2px;
  background: var(--ink); position: relative; transition: transform .2s ease, opacity .2s ease;
}
.nav-toggle span::before { position: absolute; top: -7px; }
.nav-toggle span::after { position: absolute; top: 7px; }
.nav-toggle[aria-expanded="true"] span { background: transparent; }
.nav-toggle[aria-expanded="true"] span::before { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 6. Hero ---------- */
.hero { position: relative; overflow: hidden; padding: 86px 0 92px; }
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background:
    radial-gradient(560px 300px at 12% 8%, rgba(255, 176, 32, .20), transparent 65%),
    radial-gradient(620px 340px at 88% 0%, rgba(33, 199, 168, .18), transparent 62%),
    radial-gradient(520px 320px at 70% 96%, rgba(59, 130, 246, .12), transparent 60%),
    linear-gradient(180deg, #FFF9F2, #FFFDF9);
}
.hero::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 54px; z-index: 0;
  background: radial-gradient(circle at 10px -6px, transparent 14px, var(--bg) 15px) repeat-x;
  background-size: 26px 26px;
}
.hero .inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }

.hero-badge {
  display: inline-flex; align-items: center; gap: 9px;
  background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow-sm);
  padding: 8px 16px; border-radius: 999px; font-size: 14px; font-weight: 700; color: var(--brand-600);
  margin-bottom: 20px;
}
.hero-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 0 4px rgba(34, 197, 94, .16); }

.hero h1 { font-size: 46px; font-weight: 800; line-height: 1.22; letter-spacing: -.02em; }
.hero h1 .hl { position: relative; color: var(--brand-600); white-space: nowrap; }
.hero h1 .hl::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 4px; height: 12px; z-index: -1;
  background: rgba(255, 176, 32, .35); border-radius: 6px; transform: skewX(-8deg);
}
.hero .lead { margin-top: 18px; font-size: 18px; color: var(--muted); max-width: 520px; }
.hero .actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }
.hero .note { margin-top: 16px; font-size: 14px; color: var(--muted); }

.hero .stats { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.hero .stat {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-md);
  padding: 12px 18px; box-shadow: var(--shadow-sm); min-width: 118px;
}
.hero .stat b { display: block; font-size: 24px; font-weight: 800; color: var(--brand-600); line-height: 1.2; }
.hero .stat span { font-size: 13px; color: var(--muted); }

.hero-art { position: relative; }
.hero-art .float {
  animation: floaty 5.5s ease-in-out infinite;
  filter: drop-shadow(0 18px 30px rgba(43, 43, 58, .12));
}
.hero-art .float--slow { animation-duration: 7s; animation-delay: .6s; }
@keyframes floaty { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-14px); } }

/* ---------- 7. 卡片 ---------- */
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 26px; box-shadow: var(--shadow-sm);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: #FFE2CF; }

.card .icon {
  width: 56px; height: 56px; border-radius: 16px;
  display: flex; align-items: center; justify-content: center; margin-bottom: 16px;
}
.card .icon svg { width: 30px; height: 30px; }
.icon--brand { background: var(--brand-soft); color: var(--brand-600); }
.icon--sun { background: var(--sun-soft); color: #C77F00; }
.icon--mint { background: var(--mint-soft); color: #12907A; }
.icon--sky { background: var(--sky-soft); color: var(--sky); }
.icon--violet { background: var(--violet-soft); color: var(--violet); }

.card h3 { font-size: 19px; font-weight: 800; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 15px; }

.card--flat:hover { transform: none; box-shadow: var(--shadow-sm); }

/* 赛道卡 */
.track-card { position: relative; overflow: hidden; padding: 30px 28px; }
.track-card .ribbon {
  position: absolute; top: 0; left: 0; right: 0; height: 6px;
}
.track-card .age {
  display: inline-block; font-size: 13px; font-weight: 700;
  padding: 5px 12px; border-radius: 999px; margin-bottom: 12px;
}
.track-card .meta { margin-top: 16px; padding-top: 14px; border-top: 1px dashed var(--line); }
.track-card .meta li { display: flex; gap: 8px; font-size: 14.5px; color: var(--muted); padding: 4px 0; }
.track-card .meta li b { color: var(--ink); font-weight: 700; min-width: 62px; }
.track--mint .ribbon { background: linear-gradient(90deg, var(--mint), #6FE3CC); }
.track--mint .age { background: var(--mint-soft); color: #12907A; }
.track--sky .ribbon { background: linear-gradient(90deg, var(--sky), #7FADFB); }
.track--sky .age { background: var(--sky-soft); color: var(--sky); }
.track--violet .ribbon { background: linear-gradient(90deg, var(--violet), #B79BFA); }
.track--violet .age { background: var(--violet-soft); color: var(--violet); }

/* 数据卡 */
.stat-card { text-align: center; padding: 28px 20px; }
.stat-card b { display: block; font-size: 40px; font-weight: 800; line-height: 1.1; background: linear-gradient(135deg, var(--brand), var(--sun)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat-card span { display: block; margin-top: 8px; color: var(--muted); font-size: 15px; }

/* ---------- 8. 路径 / 时间线 ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: step; }
.step { position: relative; background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg); padding: 26px 22px 22px; box-shadow: var(--shadow-sm); }
.step::before {
  counter-increment: step; content: "0" counter(step);
  display: inline-flex; align-items: center; justify-content: center;
  width: 42px; height: 42px; border-radius: 14px; margin-bottom: 14px;
  background: linear-gradient(135deg, var(--brand), var(--sun)); color: #fff; font-weight: 800; font-size: 16px;
  box-shadow: 0 8px 18px rgba(255, 122, 69, .28);
}
.step h3 { font-size: 18px; font-weight: 800; margin-bottom: 6px; }
.step p { font-size: 14.5px; color: var(--muted); }
.step .tag { display: inline-block; margin-top: 12px; font-size: 12.5px; font-weight: 700; color: var(--brand-600); background: var(--brand-soft); padding: 4px 10px; border-radius: 999px; }

/* 纵向时间线（创始人教研历程） */
.timeline { position: relative; margin-top: 10px; padding-left: 34px; }
.timeline::before {
  content: ""; position: absolute; left: 11px; top: 8px; bottom: 8px; width: 3px;
  border-radius: 3px; background: linear-gradient(180deg, var(--brand), var(--sun), var(--mint));
}
.timeline li { position: relative; padding: 0 0 30px 14px; }
.timeline li:last-child { padding-bottom: 0; }
.timeline li::before {
  content: ""; position: absolute; left: -29px; top: 7px; width: 15px; height: 15px; border-radius: 50%;
  background: #fff; border: 4px solid var(--brand); box-shadow: 0 0 0 5px rgba(255, 122, 69, .12);
}
.timeline li:nth-child(2)::before { border-color: var(--sun); box-shadow: 0 0 0 5px rgba(255, 176, 32, .14); }
.timeline li:nth-child(3)::before { border-color: var(--mint); box-shadow: 0 0 0 5px rgba(33, 199, 168, .14); }
.timeline li:nth-child(4)::before { border-color: var(--sky); box-shadow: 0 0 0 5px rgba(59, 130, 246, .14); }
.timeline .phase { font-size: 13px; font-weight: 800; letter-spacing: .1em; color: var(--brand-600); }
.timeline h3 { font-size: 19px; font-weight: 800; margin: 4px 0 6px; }
.timeline p { color: var(--muted); font-size: 15px; max-width: 760px; }

/* ---------- 9. 人物卡（创始人） ---------- */
.founder { display: grid; grid-template-columns: 320px 1fr; gap: 40px; align-items: start; }
.founder .portrait {
  position: relative; background: linear-gradient(160deg, var(--brand-soft), var(--sun-soft));
  border-radius: var(--r-xl); padding: 26px; text-align: center; box-shadow: var(--shadow-md);
}
.founder .portrait .avatar {
  width: 100%; aspect-ratio: 1 / 1; border-radius: var(--r-lg); background: #fff;
  display: flex; align-items: center; justify-content: center; overflow: hidden; border: 1px solid var(--line);
}
.founder .portrait .avatar svg { width: 72%; height: auto; }
.founder .portrait .name { margin-top: 18px; font-size: 24px; font-weight: 800; }
.founder .portrait .role { margin-top: 4px; font-size: 14px; color: var(--brand-600); font-weight: 700; }
.founder .portrait .qr { margin-top: 18px; padding-top: 16px; border-top: 1px dashed rgba(0,0,0,.08); font-size: 13px; color: var(--muted); text-align: center; }
.founder .portrait .qr img,
.founder .portrait .qr svg { width: 112px; height: 112px; margin: 10px auto 6px; border-radius: 10px; }

.founder .title-line { display: flex; flex-wrap: wrap; gap: 10px; margin: 14px 0 20px; }
.founder .title-line .chip {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 14px; font-weight: 700; padding: 7px 14px; border-radius: 999px;
  background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow-sm);
}
.founder .title-line .chip svg { width: 16px; height: 16px; color: var(--brand); }
.founder .bio { color: var(--muted); font-size: 16px; }
.founder .bio strong { color: var(--ink); }
.founder .quote {
  margin-top: 22px; padding: 18px 20px; border-left: 4px solid var(--sun);
  background: var(--sun-soft); border-radius: 0 var(--r-md) var(--r-md) 0;
  font-size: 15.5px; color: #7A5200; font-weight: 600;
}

/* 资质占位列表 */
.cred-list { margin-top: 22px; display: grid; gap: 10px; }
.cred-list li { display: flex; gap: 10px; align-items: flex-start; font-size: 15px; color: var(--ink); }
.cred-list li svg { width: 20px; height: 20px; color: var(--ok); flex: none; margin-top: 3px; }
.cred-list li span { color: var(--muted); }

/* ---------- 10. 作品 / 展示位 ---------- */
.showcase { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.work {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  overflow: hidden; box-shadow: var(--shadow-sm); transition: transform .2s ease, box-shadow .2s ease;
}
.work:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.work .thumb { aspect-ratio: 16 / 10; display: flex; align-items: center; justify-content: center; }
.work .thumb svg { width: 42%; height: auto; }
.work .thumb--mint { background: linear-gradient(135deg, var(--mint-soft), #D6F5EE); color: #12907A; }
.work .thumb--sky { background: linear-gradient(135deg, var(--sky-soft), #D8E7FF); color: var(--sky); }
.work .thumb--violet { background: linear-gradient(135deg, var(--violet-soft), #E7DDFF); color: var(--violet); }
.work .body { padding: 18px 20px 20px; }
.work .body h3 { font-size: 17px; font-weight: 800; }
.work .body p { font-size: 14px; color: var(--muted); margin-top: 4px; }
.work .body .who { margin-top: 10px; font-size: 13px; color: var(--brand-600); font-weight: 700; }

/* ---------- 11. FAQ ---------- */
.faq { max-width: 860px; margin: 0 auto; display: grid; gap: 14px; }
.faq-item { background: #fff; border: 1px solid var(--line); border-radius: var(--r-md); overflow: hidden; box-shadow: var(--shadow-sm); }
.faq-item summary {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  padding: 18px 22px; cursor: pointer; font-weight: 700; font-size: 16.5px; list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary .plus {
  flex: none; width: 26px; height: 26px; border-radius: 8px; background: var(--brand-soft); color: var(--brand-600);
  display: flex; align-items: center; justify-content: center; font-size: 18px; font-weight: 800; line-height: 1;
  transition: transform .2s ease;
}
.faq-item[open] summary .plus { transform: rotate(45deg); background: var(--brand); color: #fff; }
.faq-item .ans { padding: 0 22px 20px; color: var(--muted); font-size: 15px; }

/* ---------- 12. CTA 横幅 ---------- */
.cta-band {
  position: relative; overflow: hidden; border-radius: var(--r-xl);
  background: linear-gradient(120deg, #FF8B5C, var(--brand) 45%, #F2662F);
  color: #fff; padding: 46px 48px; box-shadow: var(--shadow-brand);
  display: grid; grid-template-columns: 1fr auto; gap: 26px; align-items: center;
}
.cta-band::before {
  content: ""; position: absolute; right: -60px; top: -70px; width: 260px; height: 260px; border-radius: 50%;
  background: rgba(255, 255, 255, .14);
}
.cta-band::after {
  content: ""; position: absolute; left: 30%; bottom: -110px; width: 220px; height: 220px; border-radius: 50%;
  background: rgba(255, 255, 255, .1);
}
.cta-band h2 { font-size: 30px; font-weight: 800; line-height: 1.3; }
.cta-band p { margin-top: 10px; opacity: .95; font-size: 16px; }
.cta-band .btn--light { background: #fff; color: var(--brand-600); box-shadow: 0 12px 26px rgba(0, 0, 0, .16); position: relative; z-index: 1; }

/* ---------- 13. 表单 ---------- */
.form-card { background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg); padding: 32px; box-shadow: var(--shadow-md); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { display: flex; flex-direction: column; gap: 7px; }
.field--full { grid-column: 1 / -1; }
.field label { font-size: 14.5px; font-weight: 700; }
.field label .req { color: var(--err); margin-left: 3px; }
.field input, .field select, .field textarea {
  border: 2px solid var(--line); border-radius: var(--r-sm);
  padding: 12px 14px; background: #FFFDFB; transition: border-color .16s ease, box-shadow .16s ease;
}
.field textarea { min-height: 104px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--brand); box-shadow: 0 0 0 4px rgba(255, 122, 69, .14);
}
.field .err-msg { display: none; font-size: 13px; color: var(--err); }
.field.is-error input, .field.is-error select, .field.is-error textarea { border-color: var(--err); }
.field.is-error .err-msg { display: block; }
.field .hint { font-size: 12.5px; color: var(--muted); }

.form-success {
  display: none; text-align: center; padding: 14px 0 4px;
}
.form-success.show { display: block; }
.form-success .ok-icon { width: 74px; height: 74px; margin: 0 auto 14px; border-radius: 50%; background: var(--mint-soft); display: flex; align-items: center; justify-content: center; }
.form-success .ok-icon svg { width: 38px; height: 38px; color: var(--ok); }
.form-success h3 { font-size: 22px; font-weight: 800; }
.form-success p { color: var(--muted); margin-top: 8px; }
.form-success .qr { margin: 18px auto 0; width: 148px; padding: 12px; background: #fff; border: 1px solid var(--line); border-radius: var(--r-md); box-shadow: var(--shadow-sm); }
.form-success .qr span { display: block; margin-top: 8px; font-size: 13px; color: var(--muted); }

.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chips input { position: absolute; opacity: 0; pointer-events: none; }
.chips label {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 16px; border-radius: 999px; border: 2px solid var(--line);
  font-size: 14.5px; font-weight: 600; cursor: pointer; background: #FFFDFB;
  transition: all .16s ease; user-select: none;
}
.chips input:checked + label { border-color: var(--brand); background: var(--brand-soft); color: var(--brand-600); font-weight: 700; }
.chips input:focus-visible + label { outline: 3px solid rgba(255, 122, 69, .4); }

/* ---------- 14. 页脚 ---------- */
.site-footer { margin-top: 78px; background: #2B2B3A; color: #C9C9D6; }
.site-footer .top { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 34px; padding: 54px 0 40px; }
.site-footer .brand { color: #fff; }
.site-footer .brand small { color: #8E8EA3; }
.site-footer p { font-size: 14.5px; margin-top: 14px; max-width: 300px; }
.site-footer h4 { color: #fff; font-size: 15.5px; font-weight: 700; margin-bottom: 14px; }
.site-footer .col a { display: block; padding: 5px 0; font-size: 14.5px; transition: color .16s ease; }
.site-footer .col a:hover { color: var(--sun); }
.site-footer .contact li { display: flex; gap: 9px; padding: 5px 0; font-size: 14.5px; }
.site-footer .contact svg { width: 17px; height: 17px; flex: none; margin-top: 4px; color: var(--sun); }
.site-footer .bottom {
  border-top: 1px solid rgba(255, 255, 255, .1);
  padding: 18px 0 22px; font-size: 13.5px; color: #8E8EA3;
  display: flex; flex-wrap: wrap; gap: 10px; justify-content: space-between;
}
/* 页脚底部仅剩版权一行时（备案号隐藏状态下）居中显示 */
.site-footer .bottom:has(> :only-child) { justify-content: center; }

/* ---------- 15. 面包屑 ---------- */
.breadcrumb { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; padding: 18px 0 0; font-size: 13.5px; color: var(--muted); }
.breadcrumb a:hover { color: var(--brand-600); }
.breadcrumb .sep { opacity: .55; }
.breadcrumb .current { color: var(--ink); font-weight: 600; }

/* ---------- 16. 页头 Hero（内页） ---------- */
.page-hero { position: relative; overflow: hidden; padding: 46px 0 60px; }
.page-hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background:
    radial-gradient(480px 260px at 8% 0%, rgba(255, 176, 32, .18), transparent 62%),
    radial-gradient(520px 280px at 92% 10%, rgba(33, 199, 168, .16), transparent 60%),
    linear-gradient(180deg, #FFF9F2, #FFFDF9);
}
.page-hero h1 { font-size: 38px; font-weight: 800; letter-spacing: -.02em; line-height: 1.25; }
.page-hero .sub { margin-top: 12px; color: var(--muted); font-size: 17px; max-width: 680px; }
.page-hero .crumbs { margin-bottom: 6px; }

/* ---------- 17. 滚动显现动效（渐进增强） ---------- */
/* 仅在 html.js 时才隐藏，JS 失效时内容仍完整可见 */
html.js .reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s cubic-bezier(.2, .7, .3, 1); }
html.js .reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  html.js .reveal { opacity: 1; transform: none; transition: none; }
  .hero-art .float { animation: none; }
  .btn:hover, .card:hover, .work:hover { transform: none; }
}

/* ---------- 18. 回到顶部 ---------- */
.to-top {
  position: fixed; right: 22px; bottom: 26px; z-index: 50;
  width: 46px; height: 46px; border-radius: 50%;
  background: #fff; color: var(--brand-600); border: 1px solid var(--line);
  box-shadow: var(--shadow-md); display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: opacity .2s ease, transform .2s ease, visibility .2s ease;
}
.to-top.show { opacity: 1; visibility: visible; transform: none; }
.to-top svg { width: 20px; height: 20px; }

/* ---------- 19. 工具类 ---------- */
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; } .mt-16 { margin-top: 16px; } .mt-24 { margin-top: 24px; } .mt-40 { margin-top: 40px; }
.mb-24 { margin-bottom: 24px; }
.hidden { display: none !important; }
.more-link { display: inline-flex; align-items: center; gap: 6px; color: var(--brand-600); font-weight: 700; font-size: 15px; }
.more-link svg { width: 16px; height: 16px; transition: transform .18s ease; }
.more-link:hover svg { transform: translateX(4px); }
.note-placeholder { font-size: 13px; color: #A08A6E; background: var(--sun-soft); border-radius: 8px; padding: 6px 12px; display: inline-block; }

/* ---------- 20. 响应式 ---------- */
@media (max-width: 1199px) {
  .hero h1 { font-size: 40px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .founder { grid-template-columns: 280px 1fr; gap: 30px; }
}

@media (max-width: 991px) {
  .section { padding: 60px 0; }
  .hero { padding: 62px 0 70px; }
  .hero .inner { grid-template-columns: 1fr; gap: 34px; }
  .hero-art { max-width: 460px; margin: 0 auto; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .founder { grid-template-columns: 1fr; }
  .founder .portrait { max-width: 340px; margin: 0 auto; }
  .site-footer .top { grid-template-columns: 1fr 1fr; gap: 28px; }
  .cta-band { grid-template-columns: 1fr; text-align: center; padding: 40px 30px; }
  .cta-band .btn { margin: 0 auto; }
}

@media (max-width: 767px) {
  :root { --header-h: 64px; }
  .nav {
    position: fixed; inset: var(--header-h) 0 auto 0; z-index: 59;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: #fff; border-bottom: 1px solid var(--line);
    padding: 12px 18px 18px; box-shadow: var(--shadow-lg);
    display: none;
  }
  .nav.open { display: flex; }
  .nav a { padding: 13px 14px; border-radius: 12px; font-size: 16px; }
  .nav a.is-active::after { display: none; }
  .nav-cta { margin: 10px 0 0; }
  .nav-cta .btn { width: 100%; }
  .nav-toggle { display: flex; margin-left: auto; }
  .brand { font-size: 18px; }
  .brand .logo { width: 34px; height: 34px; }

  .hero h1 { font-size: 31px; }
  .hero .lead { font-size: 16px; }
  .section-head h2 { font-size: 26px; }
  .page-hero h1 { font-size: 28px; }
  .grid-2, .grid-3, .grid-4, .steps, .showcase, .form-grid { grid-template-columns: 1fr; }
  .stat-card b { font-size: 32px; }
  .faq-item summary { font-size: 15.5px; }
  .form-card { padding: 24px 20px; }
  .cta-band h2 { font-size: 24px; }
  .site-footer .top { grid-template-columns: 1fr; padding: 40px 0 30px; }
  .site-footer .bottom { flex-direction: column; }
  .to-top { right: 14px; bottom: 16px; }
}

@media (max-width: 374px) {
  .hero h1 { font-size: 27px; }
  .btn { padding: 12px 20px; }
}