/* ============================================================
   内修外学 · 家庭教育 — 站点共享样式
   设计体系：暖纸底 + 深青绿 + 暖琥珀；标题 Noto Serif SC，正文系统无衬线
   ============================================================ */

:root{
  --paper:#FBF7F0;
  --paper-2:#F6EFE3;
  --sand:#F1E8D8;
  --sage:#E7EDE6;
  --ink:#1F2A28;
  --ink-2:#42524E;
  --muted:#68766F;
  --teal:#12574F;
  --teal-2:#2E7A6E;
  --teal-3:#5E9588;
  --amber:#D98E2B;
  --amber-soft:#F5E7CD;
  --line:rgba(31,42,40,.14);
  --line-soft:rgba(31,42,40,.08);
  --white:#FFFFFF;
  --shadow-sm:0 2px 10px rgba(31,42,40,.06);
  --shadow-md:0 14px 34px rgba(31,42,40,.10);
  --radius:14px;
  --radius-lg:22px;
  --container:1160px;
  --font-serif:"Noto Serif SC","Songti SC","STSong","SimSun",serif;
  --font-sans:-apple-system,"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(--font-sans);
  color:var(--ink);
  background:var(--paper);
  line-height:1.75;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}

.container{max-width:var(--container);margin:0 auto;padding:0 20px}
@media(min-width:768px){.container{padding:0 28px}}

/* ---------- 版式 ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  color:var(--teal-2);font-weight:700;font-size:14px;
  letter-spacing:.12em;
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--amber);border-radius:2px}

.section{padding:72px 0}
@media(min-width:768px){.section{padding:104px 0}}

.section-head{max-width:720px;margin-bottom:44px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.section-head.center .eyebrow{justify-content:center}
.section-head.center .eyebrow::before{display:none}
.section-head.center .eyebrow::after{content:"";width:26px;height:2px;background:var(--amber);border-radius:2px}

h1,h2,h3,.serif{font-family:var(--font-serif)}
h1{font-size:clamp(2.1rem,4.6vw,3.4rem);line-height:1.24;font-weight:900;letter-spacing:.01em}
h2{font-size:clamp(1.6rem,3vw,2.3rem);line-height:1.3;font-weight:900;letter-spacing:.01em}
h3{font-size:1.18rem;line-height:1.4;font-weight:700}
.section-head p{margin-top:14px;color:var(--ink-2);font-size:1.02rem}
.lead{color:var(--ink-2)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:999px;font-weight:700;font-size:15px;
  border:1.5px solid transparent;transition:transform .18s ease,background .18s ease,color .18s ease,box-shadow .18s ease;
  min-height:44px;white-space:nowrap;
}
.btn:active{transform:scale(.97)}
.btn-teal{background:var(--teal);color:#FDFAF4;box-shadow:0 8px 20px rgba(18,87,79,.25)}
.btn-teal:hover{background:#0E4A43;transform:translateY(-1px)}
.btn-amber{background:var(--amber);color:#FFFDF7;box-shadow:0 8px 20px rgba(217,142,43,.28)}
.btn-amber:hover{background:#C87F1F;transform:translateY(-1px)}
.btn-ghost{background:transparent;color:var(--teal);border-color:var(--teal)}
.btn-ghost:hover{background:var(--teal);color:#FDFAF4}
.btn-ghost-light{background:transparent;color:#F6EFE3;border-color:rgba(246,239,227,.45)}
.btn-ghost-light:hover{background:rgba(246,239,227,.14)}
.btn-sm{padding:9px 18px;font-size:14px;min-height:40px}

/* ---------- 顶部导航 ---------- */
.nav{
  position:sticky;top:0;z-index:100;
  background:rgba(251,247,240,.9);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line-soft);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:12px}
.brand-mark{
  width:42px;height:42px;border-radius:12px;background:var(--teal);
  display:flex;align-items:center;justify-content:center;color:#FDFAF4;
  flex:none;
}
.brand-mark svg{width:26px;height:26px}
.brand-name{line-height:1.15}
.brand-name strong{font-family:var(--font-serif);font-size:1.18rem;font-weight:900;letter-spacing:.06em;display:block;color:var(--ink)}
.brand-name span{font-size:11px;color:var(--muted);letter-spacing:.32em;display:block;margin-top:2px}

.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{
  padding:9px 15px;border-radius:10px;font-weight:600;font-size:15px;color:var(--ink-2);
  transition:color .15s,background .15s;
}
.nav-links a:hover{color:var(--teal);background:rgba(46,122,110,.08)}
.nav-links a.active{color:var(--teal)}
.nav-cta{margin-left:10px}
.nav-burger{display:none;width:44px;height:44px;border:0;background:none;border-radius:10px;align-items:center;justify-content:center}
.nav-burger span{display:block;width:22px;height:2px;background:var(--ink);border-radius:2px;position:relative;transition:.25s}
.nav-burger span::before,.nav-burger span::after{content:"";position:absolute;left:0;width:22px;height:2px;background:var(--ink);border-radius:2px;transition:.25s}
.nav-burger span::before{top:-7px}
.nav-burger span::after{top:7px}

@media(max-width:920px){
  .nav-burger{display:flex}
  .nav-links{
    position:fixed;top:68px;left:0;right:0;bottom:0;
    background:var(--paper);flex-direction:column;align-items:stretch;gap:0;
    padding:24px 20px 40px;overflow-y:auto;
    transform:translateY(-12px);opacity:0;pointer-events:none;
    transition:.22s ease;border-top:1px solid var(--line-soft);
  }
  .nav-links.open{transform:translateY(0);opacity:1;pointer-events:auto}
  .nav-links a{padding:16px 8px;font-size:1.05rem;border-bottom:1px solid var(--line-soft)}
  .nav-cta{margin:18px 0 0}
}
body.menu-open{overflow:hidden}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;padding:64px 0 72px}
@media(min-width:768px){.hero{padding:96px 0 104px}}
.hero-grid{display:grid;gap:40px;align-items:center}
@media(min-width:960px){.hero-grid{grid-template-columns:1.05fr .95fr;gap:56px}}
.hero-kicker{margin-bottom:20px}
.hero h1{margin-bottom:18px}
.hero-sub{font-size:1.08rem;color:var(--ink-2);max-width:34em;margin-bottom:30px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:34px}
.hero-facts{display:flex;flex-wrap:wrap;gap:10px 22px;color:var(--muted);font-size:14px}
.hero-facts b{color:var(--teal);font-weight:800}
.hero-fig{position:relative}
.hero-fig img{
  width:100%;border-radius:var(--radius-lg);
  box-shadow:var(--shadow-md);
}
.hero-badge{
  position:absolute;right:-6px;bottom:26px;
  background:var(--teal);color:#FDFAF4;
  padding:14px 20px;border-radius:16px;box-shadow:var(--shadow-md);
  font-size:13.5px;line-height:1.5;
}
.hero-badge b{font-family:var(--font-serif);font-size:1.35rem;display:block;color:var(--amber-soft)}
@media(max-width:640px){.hero-badge{position:static;margin-top:16px;width:fit-content}}

/* ---------- 统计条 ---------- */
.stat-band{background:var(--teal);color:#F6EFE3;padding:46px 0}
@media(min-width:768px){.stat-band{padding:54px 0}}
.stat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:30px;text-align:center}
@media(min-width:768px){.stat-grid{grid-template-columns:repeat(4,1fr)}}
.stat b{font-family:var(--font-serif);display:block;font-size:clamp(1.9rem,4vw,2.7rem);font-weight:900;color:#FFF9EC}
.stat span{font-size:14px;color:rgba(246,239,227,.78);letter-spacing:.04em}

/* ---------- 金字塔 ---------- */
.pyramid-block{
  display:grid;gap:36px;align-items:center;
}
@media(min-width:960px){.pyramid-block{grid-template-columns:1fr 1fr;gap:56px}}
.pyramid-wrap{position:relative;padding:20px 0}
.pyramid-svg{width:100%;height:auto;display:block}
.pyramid-svg .layer{cursor:pointer;transition:opacity .2s ease,transform .2s ease}
.pyramid-svg .layer polygon{transition:fill .2s ease,opacity .2s ease}
.pyramid-svg .layer text{pointer-events:none}
.pyramid-svg .layer.dim{opacity:.42}
.pyramid-svg .layer.active polygon{stroke:#FFF;stroke-width:2.5}
.pyramid-detail{
  background:var(--white);border:1px solid var(--line-soft);
  border-radius:var(--radius-lg);padding:28px;box-shadow:var(--shadow-sm);
  min-height:300px;display:flex;flex-direction:column;
}
@media(min-width:960px){.pyramid-detail{min-height:330px}}
.pd-top{display:flex;align-items:baseline;gap:12px;margin-bottom:14px}
.pd-no{font-family:var(--font-serif);font-size:2.6rem;font-weight:900;color:var(--amber);line-height:1}
.pd-name{font-family:var(--font-serif);font-size:1.5rem;font-weight:900;color:var(--ink)}
.pd-tag{font-size:12px;font-weight:700;color:var(--teal);background:var(--sage);padding:4px 10px;border-radius:999px;margin-left:auto}
.pd-desc{color:var(--ink-2);font-size:15px;flex:1}
.pd-more{margin-top:16px;font-weight:700;color:var(--teal);font-size:14px;display:inline-flex;align-items:center;gap:6px}
@media(max-width:639px){
  .pyramid-svg{max-width:440px;margin:0 auto}
}

/* 层级标注列表（理论页） */
.layer-list{display:grid;gap:14px;margin-top:44px}
.layer-item{
  display:flex;gap:16px;align-items:flex-start;
  border:1px solid var(--line-soft);border-left:4px solid var(--teal);
  background:var(--white);border-radius:var(--radius);padding:18px 20px;
  cursor:pointer;transition:box-shadow .18s ease,transform .18s ease;
}
.layer-item:hover{box-shadow:var(--shadow-sm);transform:translateY(-1px)}
.layer-item.active{box-shadow:var(--shadow-sm)}
.layer-item .li-no{font-family:var(--font-serif);font-weight:900;font-size:1.5rem;color:var(--amber);line-height:1;flex:none;padding-top:2px}
.layer-item .li-body strong{font-family:var(--font-serif);font-size:1.12rem}
.layer-item .li-body p{color:var(--muted);font-size:14.5px;margin-top:4px}
.layer-item .li-body .li-tag{display:inline-block;font-size:12px;font-weight:700;color:var(--teal);margin-bottom:6px}

/* ---------- 递进流程 ---------- */
.flow{display:grid;gap:14px;counter-reset:step}
@media(min-width:860px){.flow{grid-template-columns:repeat(5,1fr);gap:0}}
.flow-item{
  position:relative;background:var(--white);border:1px solid var(--line-soft);
  border-radius:var(--radius);padding:22px 18px;text-align:center;
}
@media(min-width:860px){
  .flow-item{margin-right:26px}
  .flow-item:last-child{margin-right:0}
  .flow-item::after{
    content:"";position:absolute;top:50%;right:-26px;width:26px;height:2px;
    background:var(--amber);transform:translateY(-50%);
  }
  .flow-item:last-child::after{display:none}
}
.flow-item .f-dot{
  width:38px;height:38px;border-radius:50%;background:var(--teal);color:#FDFAF4;
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;
  margin:0 auto 12px;
}
.flow-item:nth-child(5) .f-dot{background:var(--amber);color:#FFFDF7}
.flow-item strong{font-family:var(--font-serif);font-size:1.05rem;display:block;margin-bottom:6px}
.flow-item p{font-size:13.5px;color:var(--muted)}

/* ---------- 特性卡片（四有一全 / 方法 / 课程） ---------- */
.cards{display:grid;gap:16px}
@media(min-width:640px){.cards-2{grid-template-columns:repeat(2,1fr)}}
@media(min-width:860px){.cards-4{grid-template-columns:repeat(4,1fr)}}
@media(min-width:860px){.cards-3{grid-template-columns:repeat(3,1fr)}}
.card{
  background:var(--white);border:1px solid var(--line-soft);border-radius:var(--radius);
  padding:26px 24px;transition:transform .18s ease,box-shadow .18s ease;
}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-sm)}
.card .c-ico{
  width:44px;height:44px;border-radius:12px;background:var(--sage);color:var(--teal);
  display:flex;align-items:center;justify-content:center;margin-bottom:16px;
}
.card .c-ico svg{width:22px;height:22px}
.card h3{margin-bottom:8px}
.card p{font-size:14.5px;color:var(--ink-2)}
.card .c-tag{display:inline-block;font-size:12px;font-weight:700;color:var(--amber);margin-bottom:10px;letter-spacing:.05em}

/* ---------- 分栏内容 ---------- */
.split{display:grid;gap:36px;align-items:center}
@media(min-width:960px){.split{grid-template-columns:1fr 1fr;gap:60px}}
.split .media img{border-radius:var(--radius-lg);box-shadow:var(--shadow-md);width:100%}
.split .media .media-cap{font-size:13px;color:var(--muted);margin-top:10px}

/* ---------- 数字列表（20项 / 章节板块） ---------- */
.num-list{display:grid;gap:12px}
@media(min-width:768px){.num-list-2{grid-template-columns:repeat(2,1fr)}}
.num-item{
  display:flex;gap:14px;align-items:baseline;
  background:var(--white);border:1px solid var(--line-soft);border-radius:12px;
  padding:14px 18px;font-size:15px;
}
.num-item .n{
  font-family:var(--font-serif);font-weight:900;color:var(--amber);
  font-size:1.15rem;flex:none;min-width:1.6em;
}
.num-item .t{color:var(--ink)}
.num-item small{display:block;color:var(--muted);font-size:13px;margin-top:2px}

/* ---------- 章节板块（著作内容体系） ---------- */
.topic{border:1px solid var(--line-soft);border-radius:var(--radius-lg);padding:28px;background:var(--white)}
.topic-head{display:flex;gap:14px;align-items:baseline;margin-bottom:16px}
.topic-no{font-family:var(--font-serif);font-weight:900;font-size:1.7rem;color:var(--teal);line-height:1}
.topic h3{font-size:1.2rem}
.topic-sub{color:var(--muted);font-size:14px;margin-bottom:16px}
.topic-list{display:grid;gap:8px}
.topic-list li{list-style:none;display:flex;gap:10px;align-items:baseline;font-size:14.5px;color:var(--ink-2)}
.topic-list li::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--amber);flex:none;transform:translateY(-2px)}
.topic-list li b{color:var(--ink);font-weight:700}
.grid-2{display:grid;gap:16px}
@media(min-width:860px){.grid-2{grid-template-columns:repeat(2,1fr)}}

/* ---------- 彩色横幅 ---------- */
.band{
  background:var(--teal);color:#F6EFE3;border-radius:var(--radius-lg);
  padding:52px 36px;position:relative;overflow:hidden;
}
@media(min-width:768px){.band{padding:72px 64px}}
.band h2{color:#FFF9EC;max-width:18em}
.band p{color:rgba(246,239,227,.85);margin-top:12px;max-width:40em}
.band .band-actions{margin-top:28px;display:flex;flex-wrap:wrap;gap:14px}
.band-deco{position:absolute;right:-60px;top:-60px;width:260px;height:260px;border-radius:50%;background:rgba(217,142,43,.22)}
.band-deco2{position:absolute;right:120px;bottom:-80px;width:200px;height:200px;border-radius:50%;background:rgba(255,255,255,.06)}

/* ---------- 关注渠道 ---------- */
.channel-row{display:flex;flex-wrap:wrap;gap:14px}
.channel{
  display:flex;align-items:center;gap:12px;background:var(--white);
  border:1px solid var(--line-soft);border-radius:14px;padding:14px 20px;min-width:220px;
}
.channel .ch-ico{width:40px;height:40px;border-radius:11px;background:var(--sand);color:var(--teal);display:flex;align-items:center;justify-content:center;flex:none}
.channel .ch-ico svg{width:20px;height:20px}
.channel strong{display:block;font-size:15px}
.channel span{font-size:13px;color:var(--muted)}

/* ---------- 关于 ---------- */
.mission-grid{display:grid;gap:16px}
@media(min-width:860px){.mission-grid{grid-template-columns:repeat(3,1fr)}}
.story-num{
  font-family:var(--font-serif);font-size:3.4rem;font-weight:900;line-height:1;
  color:var(--amber);margin-bottom:14px;
}

/* ---------- 页脚 ---------- */
.footer{background:#14221F;color:rgba(246,239,227,.72);margin-top:0;font-size:14.5px}
.footer-inner{padding:64px 0 36px}
.footer-grid{display:grid;gap:36px}
@media(min-width:860px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1.2fr}}
.footer h4{color:#F6EFE3;font-size:15px;margin-bottom:16px;font-family:var(--font-serif)}
.footer a{color:rgba(246,239,227,.72);display:block;padding:5px 0;transition:color .15s}
.footer a:hover{color:var(--amber)}
.footer .f-brand strong{font-family:var(--font-serif);font-size:1.3rem;color:#FFF9EC;letter-spacing:.08em}
.footer .f-brand p{margin-top:10px;max-width:26em;line-height:1.7}
.footer-bottom{border-top:1px solid rgba(246,239,227,.14);padding:20px 0;display:flex;flex-wrap:wrap;gap:8px;justify-content:space-between;font-size:13px;color:rgba(246,239,227,.5)}

/* ---------- 页面标题区 ---------- */
.page-hero{background:var(--paper-2);border-bottom:1px solid var(--line-soft);padding:64px 0 56px}
@media(min-width:768px){.page-hero{padding:84px 0 72px}}
.page-hero .eyebrow{margin-bottom:16px}
.page-hero h1{max-width:16em}
.page-hero p{max-width:44em;margin-top:16px;color:var(--ink-2)}

/* ---------- 动画 ---------- */
.rv{opacity:0;transform:translateY(16px);transition:opacity .5s ease,transform .5s ease}
.rv.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  .rv{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}

/* ---------- 工具类 ---------- */
.mt-12{margin-top:12px}.mt-20{margin-top:20px}.mt-28{margin-top:28px}.mt-40{margin-top:40px}
.text-amber{color:var(--amber)}
.text-teal{color:var(--teal)}
.note{
  background:var(--sand);border-radius:12px;padding:14px 18px;font-size:14px;color:var(--ink-2);
  border-left:3px solid var(--amber);
}