/* ============================================================
   清云教育 · 官网共享样式 v2
   编辑式纸本 / Editorial Paper
   ------------------------------------------------------------
   设计要点
   1. 纸本底 + 墨色字 + 四维色（心/法/境/金）克制点缀
   2. 字号全部 clamp()，桌面到手机同一套节奏
   3. 三级阴影 + 卡片顶部金线生长，hover 只做 3px 位移
   4. 移动端：全屏抽屉导航、底部常驻 CTA、表格卡片化
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root{
  /* 色 */
  --ink:#1B2129;
  --ink-2:#2C3540;
  --paper:#FAF6EF;
  --paper2:#F2EADD;
  --paper3:#EDE3D3;
  --white:#FFFFFF;
  --heart:#D9602A;
  --heart-soft:rgba(217,96,42,.12);
  --method:#2A8570;
  --env:#1E4166;
  --gold:#BF9820;
  --muted:#6B655C;
  --text2:#463F36;
  --line:rgba(27,33,41,.13);
  --line-soft:rgba(27,33,41,.07);

  /* 尺寸 */
  --radius:20px;
  --radius-lg:24px;
  --maxw:1120px;
  --gutter:24px;

  /* 间距刻度 4 / 8 / 12 / 16 / 24 / 32 / 44 / 64 / 82 */
  --s1:4px;  --s2:8px;  --s3:12px; --s4:16px;
  --s5:24px; --s6:32px; --s7:44px; --s8:64px; --s9:82px;

  /* 阴影 */
  --sh1:0 1px 2px rgba(27,33,41,.05), 0 3px 10px rgba(27,33,41,.05);
  --sh2:0 2px 4px rgba(27,33,41,.05), 0 12px 26px rgba(27,33,41,.08);
  --sh3:0 20px 48px rgba(27,33,41,.14);

  /* 动效 */
  --ease:cubic-bezier(.22,.61,.36,1);

  /* 字体 */
  --font-sans:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  --font-serif:"Songti SC","Source Han Serif SC","Noto Serif SC",Georgia,"Times New Roman",serif;
  --font-num:Georgia,"Times New Roman",var(--font-sans);

  /* 兼容旧变量名 */
  --shadow:var(--sh2);
}

/* ---------- 2. 基础重置 ---------- */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font-sans);
  background:var(--paper);
  color:var(--ink);
  font-size:16px;
  line-height:1.78;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  /* 极细纸纹，避免纯色底的塑料感 */
  background-image:url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='.028'/%3E%3C/svg%3E");
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
ul{list-style:none}
b,strong{font-weight:700}
::selection{background:rgba(217,96,42,.18)}
:focus-visible{outline:2px solid var(--heart);outline-offset:3px;border-radius:6px}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--gutter)}
section{padding:var(--s9) 0}

/* 跳转链接（键盘 / 读屏用户） */
.skip{
  position:absolute;left:-9999px;top:0;z-index:200;
  background:var(--ink);color:#fff;padding:12px 20px;border-radius:0 0 12px 0;font-size:14px;font-weight:700;
}
.skip:focus{left:0}

/* ---------- 3. 排版 ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:var(--s2);
  font-family:var(--font-num);
  font-size:11.5px;letter-spacing:.34em;color:var(--muted);
  margin-bottom:var(--s3);text-transform:uppercase;
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--gold)}

h2.title{
  font-size:clamp(23px,2.9vw,33px);
  font-weight:800;line-height:1.32;letter-spacing:-.01em;
  text-wrap:balance;
}
h2.title em{font-style:normal;color:var(--heart);position:relative}
p.sub{
  color:var(--muted);max-width:34em;margin-top:var(--s3);
  font-size:15.5px;line-height:1.85;
}
.divider{height:1px;background:var(--line);max-width:var(--maxw);margin:0 auto}

/* 引文块 */
.quote{
  background:var(--ink);color:#fff;border-radius:var(--radius-lg);
  padding:clamp(28px,4vw,44px);position:relative;overflow:hidden;
}
.quote::before{
  content:"“";position:absolute;right:18px;top:-26px;
  font-family:var(--font-serif);font-size:160px;color:rgba(255,255,255,.08);line-height:1;
}
.quote p{font-family:var(--font-serif);font-size:clamp(16px,2vw,20px);line-height:1.8;position:relative}
.quote span{display:block;margin-top:var(--s4);font-size:13px;color:rgba(255,255,255,.55)}

/* ---------- 4. 导航 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:99;
  background:rgba(250,246,239,.86);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid transparent;
  transition:background .3s var(--ease),border-color .3s var(--ease),box-shadow .3s var(--ease);
}
.site-header.scrolled{background:rgba(250,246,239,.96);border-bottom-color:var(--line);box-shadow:0 6px 24px rgba(27,33,41,.05)}
.nav-inner{
  max-width:var(--maxw);margin:0 auto;padding:0 var(--gutter);
  height:80px;display:flex;align-items:center;justify-content:space-between;gap:var(--s5);
  transition:height .3s var(--ease);
}
.site-header.scrolled .nav-inner{height:68px}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;font-size:18px;flex:none}
.brand img{width:54px;height:54px;border-radius:14px;object-fit:cover;box-shadow:0 4px 14px rgba(30,65,102,.2)}
.brand small{display:block;font-size:11px;letter-spacing:.14em;color:var(--muted);font-weight:400;margin-top:1px}
.brand span{line-height:1.25}

.menu{display:flex;gap:22px;font-size:14.5px;align-items:center}
.menu a{color:var(--muted);padding:6px 0;border-bottom:2px solid transparent;transition:color .2s var(--ease),border-color .2s var(--ease);white-space:nowrap}
.menu a:hover{color:var(--ink)}
.menu a.active{color:var(--ink);font-weight:700;border-bottom-color:var(--heart)}
.menu a.cta{
  color:#fff;background:var(--ink);padding:10px 20px;border-radius:99px;
  font-weight:700;border:0;transition:background .25s var(--ease),transform .25s var(--ease);
}
.menu a.cta:hover{background:var(--heart);transform:translateY(-1px)}

.burger{
  display:none;background:none;border:0;cursor:pointer;
  width:44px;height:44px;margin-right:-8px;
  align-items:center;justify-content:center;flex-direction:column;
  -webkit-tap-highlight-color:transparent;
}
.burger span{
  display:block;width:22px;height:2px;background:var(--ink);border-radius:2px;
  transition:transform .3s var(--ease),opacity .2s var(--ease);
}
.burger span + span{margin-top:5px}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:14px 26px;border-radius:99px;
  font-size:15px;font-weight:700;line-height:1.4;
  transition:background .25s var(--ease),color .25s var(--ease),transform .25s var(--ease),box-shadow .25s var(--ease),border-color .25s var(--ease);
  border:1.5px solid transparent;
}
.btn-primary{background:var(--ink);color:#fff;box-shadow:0 6px 18px rgba(27,33,41,.16)}
.btn-primary:hover{background:var(--heart);transform:translateY(-2px);box-shadow:0 10px 24px rgba(217,96,42,.28)}
.btn-ghost{border-color:rgba(27,33,41,.28);color:var(--ink)}
.btn-ghost:hover{background:var(--ink);color:#fff;border-color:var(--ink);transform:translateY(-2px)}
.btn .arw{transition:transform .25s var(--ease)}
.btn:hover .arw{transform:translateX(3px)}

/* 按钮组 */
.btns{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.btn-note{font-size:12.5px;color:var(--muted);margin-top:10px}

/* 文字链 */
.go{
  display:inline-flex;align-items:center;gap:6px;
  margin-top:var(--s4);font-size:14px;font-weight:800;color:var(--heart);
  border-bottom:1px solid transparent;padding-bottom:2px;
  transition:border-color .2s var(--ease),gap .2s var(--ease);
}
.go:hover{border-bottom-color:var(--heart);gap:10px}

/* ---------- 6. 内页头部 ---------- */
.page-hero{
  padding:150px 0 64px;position:relative;overflow:hidden;
  background:
    radial-gradient(620px 300px at 88% -10%, rgba(217,96,42,.10), transparent 62%),
    radial-gradient(520px 280px at 4% 100%, rgba(30,65,102,.09), transparent 62%),
    var(--paper);
  border-bottom:1px solid var(--line);
}
.page-hero::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(191,152,32,.5),transparent);
}
.page-hero h1{
  font-size:clamp(27px,3.6vw,38px);font-weight:900;line-height:1.28;
  margin-top:6px;letter-spacing:-.015em;text-wrap:balance;
}
.page-hero p{margin-top:var(--s4);color:var(--muted);font-size:16px;max-width:36em;line-height:1.85}
.crumb{font-size:12.5px;color:var(--muted);letter-spacing:.08em}
.crumb b{color:var(--ink)}

/* ---------- 7. 首页 HERO ---------- */
.hero{
  padding:152px 0 84px;position:relative;overflow:hidden;
  background:
    radial-gradient(760px 360px at 84% 2%, rgba(217,96,42,.11), transparent 60%),
    radial-gradient(680px 340px at 2% 96%, rgba(30,65,102,.10), transparent 60%),
    var(--paper);
}
.hero-grid{display:grid;grid-template-columns:1.16fr .84fr;gap:clamp(28px,4vw,52px);align-items:center}
.badge-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:var(--s4)}
.badge{
  font-size:12.5px;padding:5px 13px;border-radius:99px;
  border:1px solid var(--line);background:rgba(255,255,255,.72);
  color:var(--text2);backdrop-filter:blur(4px);
}
.hero h1{
  font-size:clamp(29px,4.3vw,45px);font-weight:900;
  line-height:1.26;letter-spacing:-.02em;text-wrap:balance;
}
.hl{position:relative;white-space:nowrap;z-index:0}
.hl::after{
  content:"";position:absolute;left:-2px;right:-2px;bottom:6px;height:11px;
  background:rgba(217,96,42,.2);z-index:-1;border-radius:4px;
}
.kick{
  margin:var(--s5) 0 var(--s5);font-size:clamp(16px,1.5vw,17.5px);
  font-weight:600;line-height:1.8;padding-left:16px;
  border-left:3px solid var(--heart);color:var(--text2);
}
.kick b{color:var(--heart)}
.who{margin-bottom:var(--s6)}
.who .lab{
  font-size:11.5px;letter-spacing:.28em;color:var(--muted);
  margin-bottom:10px;font-family:var(--font-num);
}
.who p{font-size:14.5px;color:var(--text2);margin-bottom:7px;max-width:34em;line-height:1.8}
.who p b{color:var(--ink)}

/* 信任条 */
.trust-row{
  display:flex;flex-wrap:wrap;gap:8px 20px;
  margin-top:var(--s5);padding-top:var(--s4);
  border-top:1px dashed var(--line);font-size:12.5px;color:var(--muted);
}
.trust-row span{display:inline-flex;align-items:center;gap:6px}
.trust-row svg{width:14px;height:14px;flex:none;color:var(--method)}

/* 三维小卡 */
.sanwei-card{
  background:linear-gradient(180deg,#fff 0%,#FDFBF7 100%);
  border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:38px 32px 32px;box-shadow:var(--sh3);position:relative;
}
.sanwei-card::before{
  content:"三维赋能";position:absolute;top:-14px;left:28px;
  background:var(--ink);color:#fff;font-size:11.5px;letter-spacing:.3em;
  padding:6px 16px;border-radius:99px;
}
.plane{display:flex;flex-direction:column;gap:20px;margin-top:6px}
.plane .row{display:flex;align-items:flex-start;gap:13px}
.plane .dot{width:11px;height:11px;border-radius:50%;flex:none;margin-top:9px;box-shadow:0 0 0 4px rgba(27,33,41,.04)}
.plane b{font-size:15.5px}
.plane .role{font-size:11.5px;color:var(--muted);margin-left:8px;font-weight:400;letter-spacing:.06em}
.plane .desc{display:block;font-size:13px;color:var(--muted);margin-top:1px}
.plane .bar{height:8px;border-radius:99px;background:var(--paper3);overflow:hidden;margin-top:9px}
.plane .bar i{display:block;height:100%;border-radius:99px;width:0;transition:width 1.15s var(--ease)}
.plane-note{
  margin-top:var(--s5);font-size:13.5px;border-top:1px dashed var(--line);
  padding-top:var(--s4);font-weight:600;
}
.plane-note b{color:var(--heart)}

/* ---------- 8. 数字带 ---------- */
.stats{background:var(--ink);color:#fff;padding:52px 0;position:relative;overflow:hidden}
.stats::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(600px 200px at 50% -30%, rgba(191,152,32,.16), transparent 70%);
}
.stats-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:20px;text-align:center;position:relative}
.stats-grid > div{position:relative;padding:2px 6px}
.stats-grid > div + div::before{
  content:"";position:absolute;left:0;top:12%;bottom:12%;width:1px;
  background:linear-gradient(transparent,rgba(255,255,255,.16),transparent);
}
.stats .num{
  font-family:var(--font-num);font-size:clamp(26px,3vw,34px);
  font-weight:700;line-height:1.15;letter-spacing:-.01em;
  font-variant-numeric:tabular-nums;
}
.stats .num small{font-size:14px;font-weight:600;font-family:var(--font-sans);margin-left:1px}
.stats .lab{font-size:12.5px;color:rgba(255,255,255,.6);margin-top:8px;line-height:1.6}

/* ---------- 9. 通用卡片 ---------- */
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 28px;box-shadow:var(--sh1);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease);
  position:relative;overflow:hidden;
}
.card::after{
  content:"";position:absolute;top:0;left:0;height:2px;width:0;
  background:linear-gradient(90deg,var(--gold),transparent);
  transition:width .45s var(--ease);
}
.card:hover{transform:translateY(-3px);box-shadow:var(--sh2);border-color:rgba(27,33,41,.2)}
.card:hover::after{width:56px}
.card .zh{font-size:19.5px;font-weight:900;margin-bottom:8px;line-height:1.45;letter-spacing:-.01em}
.card p{font-size:14.5px;color:var(--muted);line-height:1.8}
.tagline{
  display:inline-block;font-family:var(--font-num);
  font-size:11px;letter-spacing:.18em;color:#fff;
  padding:4px 11px;border-radius:99px;margin-bottom:13px;
}

/* 区块变体 */
.bg-tint{background:var(--paper2);position:relative}
.bg-tint::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(255,255,255,.5),transparent 140px);
}
.bg-tint > .wrap{position:relative}
.bg-dark{background:var(--ink);color:#fff}
.bg-dark h2.title{color:#fff}
.bg-dark p.sub{color:rgba(255,255,255,.62)}
.bg-dark .eyebrow{color:rgba(255,255,255,.5)}

/* ---------- 10. 四步 / 五步 ---------- */
.path-tip{
  display:inline-block;margin-top:var(--s4);background:#fff;
  border:1px solid var(--line);border-radius:99px;padding:9px 22px;
  font-size:13.5px;font-weight:700;box-shadow:var(--sh1);
}
.steps{margin-top:var(--s7);position:relative}
.steps::before{
  content:"";position:absolute;left:52px;top:34px;bottom:34px;width:1px;
  background:linear-gradient(var(--heart),var(--gold),var(--method),var(--env));
  opacity:.25;
}
.step{
  display:grid;grid-template-columns:74px 1fr;gap:var(--s5);
  background:#fff;border:1px solid var(--line);border-radius:22px;
  padding:32px 34px;margin-bottom:16px;position:relative;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease);
}
.step:hover{box-shadow:var(--sh2);transform:translateY(-3px);border-color:rgba(27,33,41,.18)}
.step .no{
  font-family:var(--font-num);font-size:38px;font-weight:700;line-height:1;
  padding-top:2px;color:var(--paper3);letter-spacing:-.02em;
}
.step.s1 .no{color:rgba(217,96,42,.32)}
.step.s2 .no{color:rgba(191,152,32,.42)}
.step.s3 .no{color:rgba(42,133,112,.34)}
.step.s4 .no{color:rgba(30,65,102,.28)}
.step h3{
  font-size:19.5px;font-weight:900;margin-bottom:7px;
  display:flex;align-items:center;gap:10px;flex-wrap:wrap;line-height:1.5;
}
.chip{font-size:11.5px;padding:3px 10px;border-radius:99px;font-weight:700;letter-spacing:.02em}
.chip-free{background:var(--method);color:#fff}
.chip-soon{background:var(--paper3);color:var(--muted)}
.chip-live{background:var(--heart);color:#fff}
.step .desc{font-size:14.5px;color:var(--muted);line-height:1.8}
.why{
  margin-top:var(--s3);font-size:13.5px;color:var(--text2);
  background:var(--paper);border-left:3px solid var(--gold);
  border-radius:10px;padding:11px 15px;line-height:1.75;
}
.why b{color:var(--ink)}
.methods{display:flex;gap:8px;flex-wrap:wrap;margin-top:var(--s3)}
.methods span{
  font-size:12.5px;background:var(--paper2);border-radius:99px;
  padding:5px 12px;color:var(--text2);
}

/* ---------- 11. 案例 ---------- */
.case-card{
  background:#fff;border:1px solid var(--line);border-radius:22px;
  padding:30px 28px;box-shadow:var(--sh1);display:flex;flex-direction:column;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease);
}
.case-card:hover{transform:translateY(-3px);box-shadow:var(--sh2);border-color:rgba(27,33,41,.18)}
.pill{
  align-self:flex-start;font-size:11.5px;font-weight:700;color:#fff;
  background:var(--heart);padding:4px 13px;border-radius:99px;
  margin-bottom:14px;letter-spacing:.02em;
}
.case-card:nth-child(2) .pill{background:var(--method)}
.case-card:nth-child(3) .pill{background:var(--env)}
.case-card h3{font-size:18.5px;font-weight:900;margin-bottom:12px;line-height:1.45;letter-spacing:-.01em}
.case-card p{font-size:14.5px;color:var(--muted);line-height:1.8}
.result{
  margin:14px 0;padding:13px 0;font-size:14px;font-weight:700;line-height:1.75;
  border-top:1px dashed var(--line);border-bottom:1px dashed var(--line);
}
.result b{color:var(--heart)}
.first-week{
  margin-top:auto;background:var(--paper2);border-radius:14px;
  padding:16px 18px;border-left:3px solid var(--gold);
}
.first-week .fl{
  font-size:11px;letter-spacing:.14em;color:var(--gold);
  font-weight:800;margin-bottom:6px;
}
.first-week p{font-size:13.5px;color:var(--text2);line-height:1.75}
.first-week p b{color:var(--ink)}

/* ---------- 12. 时间轴 ---------- */
.timeline{position:relative;padding-left:32px;margin-top:var(--s7)}
.timeline::before{
  content:"";position:absolute;left:6px;top:8px;bottom:8px;width:2px;
  background:linear-gradient(var(--heart),var(--gold),var(--method),var(--env));
  opacity:.75;border-radius:2px;
}
.tl{position:relative;padding-bottom:34px}
.tl::before{
  content:"";position:absolute;left:-32px;top:8px;width:14px;height:14px;
  border-radius:50%;background:var(--paper);border:3px solid var(--heart);
  box-shadow:0 0 0 4px var(--paper);
}
.tl:nth-child(2)::before{border-color:var(--gold)}
.tl:nth-child(3)::before{border-color:var(--method)}
.tl:nth-child(4)::before{border-color:var(--env)}
.tl:nth-child(5)::before{border-color:var(--heart)}
.tl .yr{font-family:var(--font-num);font-size:12.5px;font-weight:700;color:var(--heart);letter-spacing:.1em}
.tl h4{font-size:17.5px;font-weight:800;margin:5px 0 6px;line-height:1.5}
.tl p{font-size:14.5px;color:var(--muted);line-height:1.8}

/* ---------- 13. 课程页 ---------- */
.lesson{border-bottom:1px solid var(--line);padding:24px 0}
.lesson:last-child{border-bottom:0;padding-bottom:4px}
.lesson:first-child{padding-top:4px}
.lesson .ln{font-family:var(--font-num);font-size:11.5px;letter-spacing:.2em;color:var(--gold);font-weight:700}
.lesson h4{font-size:17.5px;font-weight:800;margin:7px 0 8px;line-height:1.5}
.lesson p{font-size:14.5px;color:var(--muted);line-height:1.8}
.lesson ul{margin-top:10px}
.lesson li{font-size:14px;color:var(--text2);padding-left:20px;position:relative;margin-bottom:6px;line-height:1.75}
.lesson li::before{content:"";position:absolute;left:4px;top:11px;width:5px;height:5px;border-radius:50%;background:var(--heart);opacity:.75}

details{border-bottom:1px solid var(--line);padding:18px 0}
details summary{
  cursor:pointer;font-size:16px;font-weight:700;list-style:none;
  display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding:4px 0;transition:color .2s var(--ease);
}
details summary:hover{color:var(--heart)}
details summary::-webkit-details-marker{display:none}
details summary::after{content:"+";color:var(--heart);font-weight:900;font-size:19px;line-height:1;transition:transform .25s var(--ease)}
details[open] summary::after{content:"–"}
details p{margin-top:10px;font-size:14.5px;color:var(--muted);line-height:1.85}

/* ---------- 14. 表格 ---------- */
.table{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;margin-top:var(--s7);box-shadow:var(--sh1);
}
.trow{
  display:grid;grid-template-columns:.9fr 1.5fr .7fr;gap:20px;
  padding:20px 28px;border-bottom:1px solid var(--line);
  align-items:center;transition:background .2s var(--ease);
}
.trow:last-child{border-bottom:0}
.trow:not(.head):hover{background:#FDFBF7}
.trow.head{
  background:var(--ink);color:#fff;font-size:12px;
  letter-spacing:.16em;padding:14px 28px;
}
.trow b{font-size:15.5px}
.trow .form{font-size:14px;color:var(--muted);line-height:1.7}
.trow .fit{font-size:13px;color:var(--heart);font-weight:700;text-align:right}

/* ---------- 15. 联系 ---------- */
.contact-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:22px;margin-top:var(--s7)}
.contact-main{
  background:linear-gradient(160deg,var(--ink) 0%,#243040 100%);
  color:#fff;border-radius:var(--radius-lg);padding:40px 38px;position:relative;overflow:hidden;
}
.contact-main::after{
  content:"";position:absolute;right:-60px;top:-60px;width:220px;height:220px;border-radius:50%;
  background:radial-gradient(circle,rgba(191,152,32,.18),transparent 70%);
}
.contact-main h3{font-size:22px;font-weight:900;margin-bottom:8px}
.contact-main > p{color:rgba(255,255,255,.62);font-size:14.5px;margin-bottom:22px}
.clist li{
  display:flex;gap:14px;align-items:flex-start;padding:15px 0;
  border-bottom:1px dashed rgba(255,255,255,.16);font-size:15px;line-height:1.65;
}
.clist li:last-child{border:0}
.clist .ic{
  width:34px;height:34px;border-radius:10px;background:rgba(255,255,255,.1);
  display:flex;align-items:center;justify-content:center;flex:none;
}
.clist .ic svg{width:16px;height:16px;stroke:#fff;stroke-width:1.7;fill:none;stroke-linecap:round;stroke-linejoin:round}
.clist b{display:block;font-size:12px;color:rgba(255,255,255,.5);font-weight:400;letter-spacing:.04em}
.contact-side{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:36px 34px}
.contact-side h4{font-size:18px;font-weight:900;margin-bottom:12px}
.contact-side p{font-size:14.5px;color:var(--muted);margin-bottom:20px}

/* 微信复制 */
.wx-copy{
  display:inline-flex;align-items:center;gap:8px;
  border:1px dashed rgba(255,255,255,.35);background:rgba(255,255,255,.06);
  color:#fff;font-size:13.5px;padding:9px 16px;border-radius:99px;
  cursor:pointer;transition:background .2s var(--ease),border-color .2s var(--ease);
  font-family:var(--font-sans);
}
.wx-copy:hover{background:rgba(255,255,255,.14);border-color:rgba(255,255,255,.6)}
.wx-copy svg{width:14px;height:14px;stroke:currentColor;stroke-width:1.8;fill:none;stroke-linecap:round;stroke-linejoin:round}
.wx-copy.light{border-color:var(--line);background:#fff;color:var(--ink)}
.wx-copy.light:hover{background:var(--paper2);border-color:rgba(27,33,41,.28)}

/* ---------- 16. 底部 CTA ---------- */
.final{
  background:var(--ink);color:#fff;text-align:center;
  padding:var(--s8) 0 76px;position:relative;overflow:hidden;
}
.final::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(700px 280px at 50% 0%, rgba(217,96,42,.14), transparent 68%),
    radial-gradient(500px 240px at 90% 100%, rgba(42,133,112,.12), transparent 70%);
}
.final > .wrap{position:relative}
.final h2{
  font-size:clamp(22px,2.7vw,29px);font-weight:900;
  line-height:1.45;margin-bottom:14px;letter-spacing:-.01em;text-wrap:balance;
}
.final p{color:rgba(255,255,255,.62);font-size:15px;margin-bottom:28px}
.final .btn-primary{background:#fff;color:var(--ink);font-size:16px;padding:16px 34px;box-shadow:0 10px 30px rgba(0,0,0,.25)}
.final .btn-primary:hover{background:var(--heart);color:#fff}
.final .minor{
  margin-top:22px;display:flex;gap:12px 22px;justify-content:center;
  flex-wrap:wrap;font-size:13.5px;align-items:center;
}
.final .minor a{color:rgba(255,255,255,.62);border-bottom:1px solid rgba(255,255,255,.2);padding-bottom:2px;transition:color .2s}
.final .minor a:hover{color:#fff;border-bottom-color:rgba(255,255,255,.6)}

/* ---------- 17. Footer ---------- */
.site-footer{background:#151A1F;color:rgba(255,255,255,.45);padding:46px 0 30px;font-size:13px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px;text-align:left;margin-bottom:26px}
.site-footer b{color:rgba(255,255,255,.92)}
.site-footer .fbrand{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.site-footer .fbrand img{width:42px;height:42px;border-radius:10px}
.site-footer h5{color:rgba(255,255,255,.85);font-size:13px;margin-bottom:10px;letter-spacing:.06em}
.site-footer a:hover{color:#fff}
.site-footer .flist a{display:block;padding:4px 0;transition:color .2s}
.copy{
  border-top:1px solid rgba(255,255,255,.1);padding-top:18px;
  display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;font-size:12.5px;
}

/* ---------- 18. 移动端常驻 CTA ---------- */
.mobile-cta{
  display:none;position:fixed;left:0;right:0;bottom:0;z-index:98;
  background:rgba(250,246,239,.97);backdrop-filter:blur(12px);
  border-top:1px solid var(--line);
  padding:10px 16px calc(10px + env(safe-area-inset-bottom));
  gap:10px;align-items:center;
  box-shadow:0 -6px 24px rgba(27,33,41,.08);
}
.mobile-cta .btn{flex:1;padding:13px 12px;font-size:14.5px;min-height:48px}
.mobile-cta .btn-ghost{flex:0 0 auto;padding:13px 16px;font-size:14px}

/* ---------- 19. Toast ---------- */
.toast{
  position:fixed;left:50%;bottom:96px;transform:translate(-50%,14px);
  background:var(--ink);color:#fff;font-size:13.5px;font-weight:600;
  padding:11px 20px;border-radius:99px;z-index:300;
  opacity:0;pointer-events:none;transition:opacity .25s var(--ease),transform .25s var(--ease);
  box-shadow:var(--sh3);white-space:nowrap;
}
.toast.on{opacity:1;transform:translate(-50%,0)}

/* ---------- 20. 动效 ---------- */
.reveal{opacity:1;transform:none}
.js .reveal{opacity:0;transform:translateY(20px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.js .reveal.on{opacity:1;transform:none}

/* ---------- 21. 响应式 ---------- */
@media (max-width:1000px){
  .menu{gap:16px;font-size:14px}
  .brand small{display:none}
  .brand img{width:46px;height:46px}
  .nav-inner{height:70px}
  .site-header.scrolled .nav-inner{height:62px}
}

@media (max-width:960px){
  :root{--gutter:20px}
  .hero-grid,.contact-grid{grid-template-columns:1fr}
  .hero-grid{gap:var(--s7)}
  .grid-2,.grid-3{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(3,1fr);gap:26px 14px}
  .stats-grid > div:nth-child(4)::before{display:none}
  .hero{padding:120px 0 60px}
  .page-hero{padding:120px 0 46px}
  section{padding:56px 0}
  .step{grid-template-columns:48px 1fr;gap:16px;padding:26px 22px}
  .step .no{font-size:29px}
  .steps::before{display:none}
  .trow{grid-template-columns:1fr;gap:6px;padding:18px 22px}
  .trow .fit{text-align:left}
  .foot-grid{grid-template-columns:1fr;gap:24px}
  .final{padding:64px 0}

  /* 抽屉导航
     注意：.site-header 的 backdrop-filter 会成为 fixed 后代的包含块，
     因此 top 由 JS 按头部实际高度设置，这里用视口高度撑满 */
  .burger{display:flex}
  .menu{
    position:fixed;top:68px;left:0;right:0;
    height:calc(100dvh - 68px);
    background:var(--paper);
    flex-direction:column;align-items:stretch;gap:0;
    padding:8px var(--gutter) calc(24px + env(safe-area-inset-bottom));
    border-top:1px solid var(--line);
    overflow-y:auto;
    transform:translateY(-8px);opacity:0;visibility:hidden;
    transition:opacity .28s var(--ease),transform .28s var(--ease),visibility .28s;
  }
  .menu.open{transform:none;opacity:1;visibility:visible}
  .menu a{
    padding:15px 2px;font-size:16px;color:var(--ink);
    border-bottom:1px solid var(--line-soft);
  }
  .menu a.active{color:var(--heart)}
  .menu a.active::after{content:"· 当前页";font-size:11px;color:var(--muted);font-weight:400;margin-left:8px}
  .menu a.cta{
    margin-top:18px;text-align:center;justify-content:center;
    padding:15px;border-bottom:0;color:#fff;
  }
  body.nav-open{overflow:hidden}

  /* 移动端底部常驻 CTA */
  .mobile-cta{display:flex}
  body{padding-bottom:76px}
  .toast{bottom:86px}
}

@media (max-width:560px){
  .stats-grid{grid-template-columns:1fr 1fr}
  .stats-grid > div:nth-child(3)::before{display:none}
  .stats-grid > div:nth-child(4)::before{display:block}
  .stats-grid > div:last-child{grid-column:1 / -1;border-top:1px solid rgba(255,255,255,.1);padding-top:18px}
  .stats-grid > div:last-child::before{display:none}
  .final h2{font-size:21px}
  .trow.head{display:none}
  .trow{padding:16px 18px;gap:4px}
  .trow b{font-size:16px}
  .trow .fit{font-size:12px;margin-top:4px}
  .card{padding:26px 22px}
  .case-card{padding:26px 22px}
  .sanwei-card{padding:34px 24px 26px}
  .contact-main{padding:32px 24px}
  .contact-side{padding:28px 22px}
  .btn{padding:13px 22px;font-size:14.5px;min-height:46px}
  .btns .btn{flex:1 1 100%}
  .btns .btn-ghost{flex:0 0 auto}
  .trust-row{font-size:12px;gap:6px 16px}
  .quote::before{font-size:110px;top:-18px}
}

/* ---------- 21b. 首页品牌标识与家长问答入口 ---------- */
.brand-mark{margin:0 0 16px;font-size:17px;font-weight:800;color:var(--heart);letter-spacing:.01em}
.brand-mark span{font-size:13px;font-weight:400;color:var(--muted);margin-left:8px}
.faq-entry{
  display:flex;align-items:center;gap:14px;margin:18px 0 20px;padding:14px 18px;
  background:var(--white);border:1px solid var(--line);border-left:4px solid var(--heart);
  border-radius:12px;text-decoration:none;color:var(--ink);
  transition:transform .2s var(--ease),box-shadow .2s var(--ease);
}
.faq-entry:hover{transform:translateY(-2px);box-shadow:0 8px 22px rgba(27,33,41,.1)}
.fe-ico{flex:0 0 auto;width:44px;height:44px;border-radius:12px;background:var(--heart);color:var(--white);display:flex;align-items:center;justify-content:center;font-size:19px;font-weight:800}
.fe-txt{flex:1;min-width:0}
.fe-txt b{display:block;font-size:16px}
.fe-txt small{display:block;font-size:12.5px;color:var(--muted);margin-top:2px;line-height:1.5}
.fe-go{flex:0 0 auto;font-size:13.5px;font-weight:700;color:var(--heart);white-space:nowrap}
@media (max-width:560px){
  .brand-mark{font-size:16px;margin-bottom:12px}
  .brand-mark span{display:block;margin:2px 0 0;font-size:12px}
  .faq-entry{gap:10px;padding:12px 14px;margin:14px 0 16px}
  .fe-ico{width:38px;height:38px;font-size:17px}
  .fe-txt b{font-size:15px}
  .fe-go{display:none}
}

/* ---------- 22. 无障碍 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js .reveal{opacity:1;transform:none}
}

/* ---------- 23. 打印 ---------- */
@media print{
  .site-header,.mobile-cta,.final,.burger,.toast{display:none !important}
  body{background:#fff;padding:0}
  section{padding:24px 0;break-inside:avoid}
  .card,.step,.case-card{box-shadow:none;border-color:#ccc}
}

/* 页脚 ICP 备案号（合规展示，链接工信部备案系统） */
.copy .beian{margin-left:auto}
.copy .beian a{color:rgba(255,255,255,.62);text-decoration:none;border-bottom:1px solid rgba(255,255,255,.2);padding-bottom:1px;transition:color .2s,border-color .2s}
.copy .beian a:hover{color:#fff;border-color:rgba(255,255,255,.55)}