/* =============================================================
   合一教育 · EduHey — 设计系统
   气质：学术感 · 成长感 · 可信赖 · 安静而不冷淡
   主色：深墨绿 / 深藏蓝 / 暖米白 / 低饱和铜金（仅点缀）
   ============================================================= */

:root {
  /* 主色 —— 深墨绿 / 深青绿 */
  --green-900: #0d2b27;   /* 最深，大面积背景 */
  --green-800: #123630;
  --green-700: #1b4a41;
  --green-600: #2a6253;
  --green-50:  #eef3ef;

  /* 深藏蓝 —— 标题 / 导航 / 专业感 */
  --navy-900: #14233d;
  --navy-700: #1f3357;
  --navy-500: #3a4d72;

  /* 暖米白 —— 页面底色 */
  --cream:    #f7f4ec;
  --cream-2:  #f1ece0;   /* 略深的分区底 */
  --paper:    #fffdf8;   /* 卡片白 */

  /* 低饱和铜金 —— 仅细线/悬停/重点标识 */
  --copper:   #a9824f;
  --copper-d: #8c6a3e;
  --copper-l: #c19c6a;

  /* 文字 */
  --ink:      #232a26;   /* 正文 */
  --ink-soft: #4a534c;
  --muted:    #707a72;
  --line:     #e3ddcf;   /* 米色系分隔线 */
  --line-soft:#ece6da;

  --maxw: 1140px;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgba(20,35,30,.05), 0 8px 30px rgba(20,35,30,.06);
  --shadow-soft: 0 1px 2px rgba(20,35,30,.04);

  --serif: "Noto Serif SC", "Source Han Serif SC", "Source Han Serif CN", "Songti SC", "STSong", "SimSun", Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--cream);
  font-size: 16px;
  line-height: 1.78;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a { color: var(--green-700); text-decoration: none; transition: color .18s ease; }
a:hover { color: var(--copper-d); }

h1, h2, h3, h4 { font-family: var(--serif); color: var(--navy-900); font-weight: 600; line-height: 1.32; letter-spacing: .01em; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }
.container-narrow { max-width: 820px; margin: 0 auto; padding: 0 28px; }

/* ---------- 通用排版 ---------- */
.eyebrow {
  display: inline-block;
  font-family: var(--sans);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--copper-d);
  margin-bottom: 16px;
}
.eyebrow::before { content: ""; display: inline-block; width: 22px; height: 1px; background: var(--copper); vertical-align: middle; margin-right: 10px; }

.section { padding: 92px 0; }
.section-sm { padding: 64px 0; }
.section-head { max-width: 720px; }
.section-head.center { margin: 0 auto; text-align: center; }
.section-head h2 { font-size: 30px; color: var(--navy-900); }
.section-head p { margin-top: 16px; color: var(--ink-soft); font-size: 17px; }

.lede { font-size: 18.5px; line-height: 1.85; color: var(--ink-soft); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--sans); font-size: 15px; font-weight: 600;
  padding: 13px 26px; border-radius: 999px; border: 1px solid transparent;
  cursor: pointer; transition: all .2s ease; white-space: nowrap;
}
.btn .arr { transition: transform .2s ease; }
.btn:hover .arr { transform: translateX(3px); }

.btn-primary { background: var(--green-700); color: #fdfaf2; }
.btn-primary:hover { background: var(--green-800); color: #fff; box-shadow: 0 8px 22px rgba(13,43,39,.22); }

.btn-ghost { background: transparent; color: var(--navy-900); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--copper); color: var(--copper-d); }

.btn-light { background: rgba(255,255,255,.10); color: #f4efe2; border-color: rgba(241,236,224,.28); }
.btn-light:hover { background: rgba(255,255,255,.16); color: #fff; border-color: var(--copper-l); }

.btn-gold-line { background: transparent; color: #f1e7d4; border-color: var(--copper); }
.btn-gold-line:hover { background: var(--copper); color: #1b150c; }

.textlink { font-weight: 600; color: var(--green-700); }
.textlink .arr { display: inline-block; transition: transform .2s ease; }
.textlink:hover .arr { transform: translateX(3px); }

/* =============================================================
   Header
   ============================================================= */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(247,244,236,.86);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease, background .2s ease;
}
.site-header.scrolled { border-bottom-color: var(--line); background: rgba(247,244,236,.94); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 70px; }

.brand-wrap { display: flex; align-items: center; gap: 12px; }
.brand-wrap .sublabel {
  font-family: var(--serif); font-size: 13px; font-weight: 600; color: var(--green-800);
  padding: 4px 12px; border: 1px solid var(--line); border-left: 2px solid var(--copper);
  border-radius: 6px; letter-spacing: .04em; white-space: nowrap; background: rgba(255,255,255,.4);
}
.brand-wrap .sublabel:hover { color: var(--copper-d); border-left-color: var(--copper-d); }
.brand { display: flex; align-items: center; gap: 11px; }
.brand .mark { width: 34px; height: 34px; flex: none; object-fit: contain; display: block; }
.brand .mark.mark-light { background: var(--cream); border-radius: 7px; padding: 2px; box-sizing: content-box; }
.brand .wm { display: flex; flex-direction: column; line-height: 1.05; }
.brand .wm b { font-family: var(--serif); font-size: 18px; color: var(--navy-900); font-weight: 600; letter-spacing: .02em; }
.brand .wm span { font-size: 10.5px; letter-spacing: .26em; color: var(--copper-d); text-transform: uppercase; }

.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-menu a { font-size: 14.5px; font-weight: 500; color: var(--navy-700); padding: 8px 13px; border-radius: 8px; position: relative; }
.nav-menu a:hover { color: var(--green-700); }
.nav-menu a.active { color: var(--green-800); }
.nav-menu a.active::after {
  content: ""; position: absolute; left: 13px; right: 13px; bottom: 2px; height: 2px;
  background: var(--copper); border-radius: 2px;
}
.nav-cta { margin-left: 10px; }
.nav-menu .nav-cta { padding: 0; }
/* CTA 按钮文字颜色：覆盖 .nav-menu a 的导航色，保证墨绿底上为浅色字 */
.nav-menu .nav-cta a.btn-primary { color: #fdfaf2; }
.nav-menu .nav-cta a.btn-primary:hover { color: #fff; }

.nav-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 10px; background: var(--paper); cursor: pointer; }
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: ""; display: block; width: 18px; height: 2px; background: var(--navy-900); margin: 0 auto; position: relative; transition: .2s;
}
.nav-toggle span::before { position: absolute; top: -6px; }
.nav-toggle span::after { position: absolute; top: 6px; }

/* =============================================================
   Hero
   ============================================================= */
.hero {
  position: relative; overflow: hidden;
  background: radial-gradient(120% 130% at 85% 0%, var(--green-700) 0%, var(--green-900) 60%);
  color: #eef0e8;
}
.hero::after {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(50% 60% at 88% 18%, rgba(169,130,79,.16), transparent 70%),
    linear-gradient(180deg, transparent 60%, rgba(8,26,24,.5) 100%);
  pointer-events: none;
}
.hero .container { position: relative; z-index: 1; padding-top: 104px; padding-bottom: 104px; }
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 56px; align-items: center; }
.hero .eyebrow { color: var(--copper-l); }
.hero .eyebrow::before { background: var(--copper-l); }
.hero h1 { color: #fbf8f0; font-size: 46px; line-height: 1.28; letter-spacing: .02em; }
.hero h1 .accent { color: var(--copper-l); }
.hero .sub { margin-top: 22px; font-size: 18px; line-height: 1.85; color: #cdd6cd; max-width: 560px; }
.hero .actions { margin-top: 34px; display: flex; gap: 14px; flex-wrap: wrap; }
.hero .note { margin-top: 26px; font-size: 13.5px; color: #9fb0a6; }

.hero-aside { border-left: 1px solid rgba(193,156,106,.3); padding-left: 30px; }
.hero-aside .pillar { padding: 16px 0; border-bottom: 1px solid rgba(241,236,224,.12); }
.hero-aside .pillar:last-child { border-bottom: 0; }
.hero-aside .pillar b { font-family: var(--serif); font-size: 17px; color: #f4efe2; display: block; }
.hero-aside .pillar span { font-size: 13.5px; color: #a7b6ab; }

/* =============================================================
   信任条 / 统计（理念型，不含虚构数据）
   ============================================================= */
.beliefbar { background: var(--green-800); color: #dfe6df; }
.beliefbar .container { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; padding: 40px 28px; }
.belief { }
.belief b { font-family: var(--serif); font-size: 16px; color: #f3eee0; display: block; margin-bottom: 4px; }
.belief b .dot { color: var(--copper-l); }
.belief span { font-size: 13.5px; color: #a4b3a8; line-height: 1.6; }

/* =============================================================
   服务三主线
   ============================================================= */
.lines { background: var(--cream); }
.lines-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 48px; }
.line-card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 34px 30px; transition: all .22s ease; display: flex; flex-direction: column;
  box-shadow: var(--shadow-soft);
}
.line-card:hover { transform: translateY(-4px); border-color: var(--copper-l); box-shadow: var(--shadow); }
.line-card .lc-no { font-family: var(--serif); font-size: 14px; color: var(--copper-d); letter-spacing: .1em; }
.line-card h3 { font-size: 21px; margin: 14px 0 12px; color: var(--navy-900); }
.line-card p { color: var(--ink-soft); font-size: 15px; flex: 1; }
.line-card ul { list-style: none; margin: 16px 0 20px; }
.line-card li { font-size: 14px; color: var(--muted); padding-left: 18px; position: relative; margin: 6px 0; }
.line-card li::before { content: ""; position: absolute; left: 0; top: 10px; width: 6px; height: 6px; border-radius: 50%; background: var(--green-600); }
.line-card .more { margin-top: auto; }

/* =============================================================
   原则 / 方法论
   ============================================================= */
.principles { background: var(--cream-2); border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); }
.principles-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; margin-top: 46px; }
.principle { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px 26px; }
.principle .pn { font-family: var(--serif); color: var(--copper-d); font-size: 15px; }
.principle h4 { font-size: 18px; margin: 10px 0 9px; }
.principle p { font-size: 14.5px; color: var(--ink-soft); }

.pledge { margin-top: 46px; background: var(--green-900); color: #e7ebe3; border-radius: var(--radius); padding: 34px 36px; display: flex; gap: 22px; align-items: center; }
.pledge .pl-mark { font-family: var(--serif); font-size: 15px; letter-spacing: .2em; color: var(--copper-l); writing-mode: vertical-rl; border-right: 1px solid rgba(193,156,106,.4); padding-right: 18px; }
.pledge p { font-size: 16.5px; line-height: 1.85; }
.pledge p b { color: #fff; font-weight: 600; }

/* =============================================================
   工具 / 资源入口
   ============================================================= */
.tools-cta { background: var(--cream); }
.tools-band { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items: center; }
.tool-list { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.tool-chip { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 16px 18px; }
.tool-chip b { display: block; font-family: var(--serif); font-size: 15.5px; color: var(--navy-900); }
.tool-chip span { font-size: 13px; color: var(--muted); }

/* =============================================================
   通用：图标方块 / 列表块
   ============================================================= */
.feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; margin-top: 40px; }
.feature { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }
.feature .fi { width: 40px; height: 40px; border-radius: 10px; background: var(--green-50); border: 1px solid var(--line); display: flex; align-items: center; justify-content: center; margin-bottom: 16px; }
.feature .fi svg { width: 20px; height: 20px; stroke: var(--green-700); }
.feature h4 { font-size: 18px; margin-bottom: 8px; }
.feature p { font-size: 14.5px; color: var(--ink-soft); }

.steps { counter-reset: step; margin-top: 40px; display: grid; gap: 18px; }
.step { display: flex; gap: 20px; background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px 26px; }
.step .sn { counter-increment: step; font-family: var(--serif); font-size: 22px; color: var(--copper-d); flex: none; width: 46px; }
.step .sn::before { content: "0" counter(step); }
.step h4 { font-size: 17px; margin-bottom: 6px; }
.step p { font-size: 14.5px; color: var(--ink-soft); }

/* 文章列表 (insights) */
.post-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 44px; }
.post { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px 26px; display: flex; flex-direction: column; }
.post .cat { font-size: 12px; letter-spacing: .1em; color: var(--copper-d); text-transform: uppercase; }
.post h3 { font-size: 19px; margin: 12px 0 10px; }
.post p { font-size: 14.5px; color: var(--ink-soft); flex: 1; }
.post .meta { margin-top: 18px; font-size: 13px; color: var(--muted); }

/* 关于 / 联系 */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; margin-top: 44px; }
.contact-card { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; }
.contact-card h4 { font-size: 18px; margin-bottom: 16px; }
.contact-row { display: flex; gap: 12px; padding: 12px 0; border-bottom: 1px dashed var(--line); font-size: 15px; }
.contact-row:last-child { border-bottom: 0; }
.contact-row .k { color: var(--muted); width: 86px; flex: none; }
.contact-row .v { color: var(--ink); }

.note-box { background: var(--green-50); border: 1px solid var(--line); border-left: 3px solid var(--copper); border-radius: var(--radius-sm); padding: 18px 22px; font-size: 14.5px; color: var(--ink-soft); }

/* 通用页内 hero（非首页） */
.page-hero { background: linear-gradient(160deg, var(--green-800), var(--green-900)); color: #eef0e8; }
.page-hero .container { padding: 78px 28px 70px; }
.page-hero .eyebrow { color: var(--copper-l); }
.page-hero .eyebrow::before { background: var(--copper-l); }
.page-hero h1 { color: #fbf8f0; font-size: 38px; max-width: 760px; }
.page-hero p { margin-top: 18px; font-size: 17.5px; color: #cdd6cd; max-width: 640px; }
.breadcrumb { font-size: 13px; color: #9fb0a6; margin-bottom: 18px; }
.breadcrumb a { color: #c2cdc2; }
.breadcrumb a:hover { color: var(--copper-l); }

/* 富文本区 */
.prose h2 { font-size: 24px; margin: 40px 0 14px; }
.prose h3 { font-size: 19px; margin: 28px 0 10px; }
.prose p { margin: 12px 0; color: var(--ink-soft); }
.prose ul { margin: 12px 0 12px 4px; list-style: none; }
.prose li { padding-left: 20px; position: relative; margin: 8px 0; color: var(--ink-soft); }
.prose li::before { content: ""; position: absolute; left: 0; top: 12px; width: 7px; height: 1.5px; background: var(--copper); }

/* CTA 大区 */
.cta-band { background: radial-gradient(120% 140% at 15% 0%, var(--green-700), var(--green-900)); color: #eef0e8; }
.cta-band .container { padding: 78px 28px; text-align: center; }
.cta-band h2 { color: #fbf8f0; font-size: 30px; }
.cta-band p { margin: 16px auto 30px; max-width: 560px; color: #cdd6cd; font-size: 17px; }
.cta-band .actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* =============================================================
   Footer
   ============================================================= */
.site-footer { background: var(--green-900); color: #b9c4ba; font-size: 14px; }
.footer-main { display: grid; grid-template-columns: 1.3fr 1fr 1fr .82fr .82fr; gap: 36px; padding: 66px 28px 44px; }
.footer-brand .brand .wm b { color: #f1ece0; }
.footer-brand p { margin-top: 16px; font-size: 13.5px; color: #93a297; max-width: 280px; line-height: 1.8; }
.footer-col h5 { font-family: var(--sans); font-size: 13px; letter-spacing: .14em; text-transform: uppercase; color: var(--copper-l); margin-bottom: 16px; font-weight: 600; }
.footer-col a { display: block; color: #b9c4ba; padding: 5px 0; font-size: 14px; }
.footer-col a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(241,236,224,.10); padding: 24px 28px 40px; }
.footer-bottom .container { display: flex; flex-wrap: wrap; gap: 8px 22px; align-items: center; justify-content: space-between; }
.footer-legal { display: flex; flex-wrap: wrap; gap: 6px 18px; font-size: 12.5px; color: #8a988d; }
.footer-legal a { color: #8a988d; }
.footer-legal a:hover { color: var(--copper-l); }
.footer-entity { font-size: 12.5px; color: #8a988d; }
.footer-entity b { color: #c3cdc4; font-weight: 500; }

/* =============================================================
   响应式
   ============================================================= */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero-aside { border-left: 0; border-top: 1px solid rgba(193,156,106,.3); padding-left: 0; padding-top: 24px; }
  .hero h1 { font-size: 38px; }
  .lines-grid, .principles-grid, .post-grid { grid-template-columns: 1fr 1fr; }
  .beliefbar .container { grid-template-columns: 1fr 1fr; }
  .tools-band, .contact-grid, .feature-grid { grid-template-columns: 1fr; }
  .footer-main { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav-menu {
    position: fixed; inset: 70px 0 auto 0; flex-direction: column; align-items: stretch;
    background: var(--cream); border-bottom: 1px solid var(--line); padding: 14px 22px 22px;
    gap: 2px; transform: translateY(-12px); opacity: 0; pointer-events: none; transition: .2s;
  }
  .nav-menu.open { transform: none; opacity: 1; pointer-events: auto; }
  .nav-menu a { padding: 13px 8px; border-bottom: 1px solid var(--line-soft); }
  .nav-menu a.active::after { display: none; }
  .nav-cta { margin: 12px 0 0; }
  .nav-menu .btn { width: 100%; justify-content: center; }
  .nav-toggle { display: block; }
  .section { padding: 64px 0; }
  .hero .container { padding-top: 64px; padding-bottom: 72px; }
  .hero h1 { font-size: 31px; }
  .lines-grid, .principles-grid, .post-grid, .beliefbar .container, .footer-main { grid-template-columns: 1fr; }
  .section-head h2 { font-size: 25px; }
  .pledge { flex-direction: column; align-items: flex-start; }
  .pledge .pl-mark { writing-mode: horizontal-tb; border-right: 0; border-bottom: 1px solid rgba(193,156,106,.4); padding: 0 0 10px; }
  .container, .container-narrow { padding: 0 20px; }
}

/* =============================================================
   子品牌 B「学习成长」主题：深青蓝 / 钢蓝（沉稳，面向家长）
   仅改主色族，铜金点缀、米白底色、衬线标题保持一致。
   ============================================================= */
body.theme-learning {
  --green-900: #10303a;
  --green-800: #143a45;
  --green-700: #1d5460;
  --green-600: #2c6f78;
  --green-50:  #e9f1f1;
}
body.theme-learning .brand-wrap .sublabel { color: var(--green-700); }

/* =============================================================
   总门户 · 分流页（/）
   ============================================================= */
.portal-hero { background: radial-gradient(125% 130% at 80% 0%, var(--green-700) 0%, var(--green-900) 62%); color: #eef0e8; position: relative; overflow: hidden; }
.portal-hero::after { content: ""; position: absolute; inset: 0; background: radial-gradient(46% 60% at 85% 16%, rgba(169,130,79,.16), transparent 70%); pointer-events: none; }
.portal-hero .container { position: relative; z-index: 1; padding: 96px 28px 60px; text-align: center; max-width: 880px; }
.portal-hero .eyebrow { color: var(--copper-l); }
.portal-hero .eyebrow::before { background: var(--copper-l); }
.portal-hero h1 { color: #fbf8f0; font-size: 42px; line-height: 1.3; letter-spacing: .02em; }
.portal-hero h1 .accent { color: var(--copper-l); }
.portal-hero p { margin: 22px auto 0; max-width: 600px; font-size: 18px; color: #cdd6cd; }

.portal-doors { background: var(--cream); }
.portal-doors .container { padding: 0 28px; margin-top: -42px; position: relative; z-index: 5; }
.doors { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.door {
  display: flex; flex-direction: column; background: var(--paper); border: 1px solid var(--line);
  border-radius: 18px; padding: 40px 38px; box-shadow: var(--shadow); transition: all .22s ease;
  position: relative; overflow: hidden;
}
.door::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--green-700); transition: width .22s ease; }
.door:hover { transform: translateY(-4px); border-color: var(--copper-l); box-shadow: var(--shadow-lg); }
.door:hover::before { width: 6px; }
.door.door-learning::before { background: #1d5460; }
.door .dk { font-family: var(--sans); font-size: 12.5px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; color: var(--copper-d); }
.door h2 { font-size: 26px; margin: 14px 0 4px; color: var(--navy-900); }
.door .for { font-size: 13.5px; color: var(--muted); margin-bottom: 16px; }
.door > p { font-size: 15px; color: var(--ink-soft); }
.door ul { list-style: none; margin: 18px 0 24px; }
.door li { font-size: 14px; color: var(--ink-soft); padding-left: 18px; position: relative; margin: 7px 0; }
.door li::before { content: ""; position: absolute; left: 0; top: 9px; width: 6px; height: 6px; border-radius: 50%; background: var(--green-600); }
.door .door-cta { margin-top: auto; }

@media (max-width: 820px) {
  .doors { grid-template-columns: 1fr; gap: 18px; }
  .portal-hero h1 { font-size: 31px; }
  .portal-hero .container { padding-top: 64px; }
}

/* 页脚 5 列在中屏的收拢 */
@media (max-width: 980px) {
  .footer-main { grid-template-columns: 1fr 1fr 1fr; }
}
@media (max-width: 720px) {
  .footer-main { grid-template-columns: 1fr; }
}