/* ============================================================
   刘柯彤老师 · 高途浙沪本地化课程
   版式：新中式（宣纸 / 墨 / 朱砂）
   ============================================================ */

:root{
  --paper:#f6f2e9;
  --paper-2:#efe9dd;
  --paper-3:#e7dfd0;
  --ink:#211f1c;
  --ink-2:#55504a;
  --ink-3:#8c8478;
  --cinnabar:#a5322a;
  --cinnabar-2:#bf4638;
  --jade:#3c5a4d;
  --gold:#a8874f;
  --white:#fffdf9;
  --line:rgba(33,31,28,.12);
  --line-2:rgba(33,31,28,.26);
  --serif:"Songti SC","STSong","Source Han Serif SC","Noto Serif CJK SC","Noto Serif SC","SimSun",Georgia,serif;
  --sans:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,sans-serif;
  --wrap:1180px;
  --ease:cubic-bezier(.25,.6,.35,1);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  color:var(--ink);
  font-family:var(--sans);
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
  background-color:var(--paper);
  background-image:
    radial-gradient(ellipse 75% 55% at 50% 0%, rgba(168,135,79,.06), transparent 62%),
    radial-gradient(ellipse 60% 50% at 100% 45%, rgba(60,90,77,.045), transparent 62%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)' opacity='0.038'/%3E%3C/svg%3E");
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
svg{width:17px;height:17px;fill:currentColor;flex:none}
::selection{background:rgba(165,50,42,.16)}
h1,h2,h3,h4,blockquote{font-family:var(--serif);font-weight:600;letter-spacing:.01em}

.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 28px}

/* ---------- 印章 ---------- */
.seal{
  display:grid;place-items:center;flex:none;
  width:40px;height:40px;
  background:var(--cinnabar);color:#fdfbf6;
  font-family:var(--serif);font-size:20px;line-height:1;
  border-radius:2px;
  box-shadow:inset 0 0 0 1.5px rgba(253,251,246,.3);
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-size:15px;font-weight:500;letter-spacing:.04em;
  padding:12px 28px;border-radius:2px;border:1px solid transparent;
  transition:all .25s var(--ease);white-space:nowrap;
}
.btn-primary{background:var(--cinnabar);color:#fdfbf6;box-shadow:0 2px 0 rgba(33,31,28,.1)}
.btn-primary:hover{background:var(--cinnabar-2);transform:translateY(-1px);box-shadow:0 6px 18px rgba(165,50,42,.28)}
.btn-outline{border-color:var(--line-2);color:var(--ink)}
.btn-outline:hover{border-color:var(--ink);background:rgba(33,31,28,.035)}
.btn-lg{padding:15px 34px;font-size:16px}
.arw{transition:transform .25s var(--ease)}
.btn:hover .arw{transform:translateX(4px)}

/* ---------- 导航 ---------- */
.nav{
  position:sticky;top:0;z-index:60;
  background:rgba(246,242,233,.9);
  backdrop-filter:blur(14px) saturate(150%);
  border-bottom:1px solid var(--line);
}
.nav-inner{display:flex;align-items:center;gap:32px;height:78px}
.brand{display:flex;align-items:center;gap:13px;flex:none}
.brand-text{display:flex;flex-direction:column;line-height:1.35}
.brand-text strong{font-family:var(--serif);font-size:16px;letter-spacing:.06em}
.brand-text small{font-size:11.5px;color:var(--ink-3);letter-spacing:.04em}

.nav-links{display:flex;gap:30px;margin-left:auto}
.nav-links a{
  position:relative;font-size:14.5px;color:var(--ink-2);
  padding:6px 0;transition:color .2s;letter-spacing:.05em;
}
.nav-links a::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:var(--cinnabar);transform:scaleX(0);transform-origin:left;
  transition:transform .28s var(--ease);
}
.nav-links a:hover{color:var(--ink)}
.nav-links a:hover::after{transform:scaleX(1)}

.nav-actions{display:flex;align-items:center;gap:20px;flex:none}
.nav-phone{display:flex;align-items:center;gap:7px;font-size:14.5px;color:var(--ink-2);letter-spacing:.03em}
.nav-phone:hover{color:var(--cinnabar)}

/* ---------- 首屏 ---------- */
.hero{position:relative;padding:74px 0 56px;overflow:hidden}
.hero-grid{
  position:relative;display:grid;gap:56px;
  grid-template-columns:1.02fr .98fr;align-items:center;
}

.eyebrow{
  display:inline-flex;align-items:center;gap:11px;
  font-size:13px;color:var(--gold);letter-spacing:.16em;
  margin-bottom:26px;
}
.eyebrow-bar{width:30px;height:1px;background:var(--gold);flex:none}

.hero h1{
  font-size:clamp(36px,4.8vw,56px);
  line-height:1.42;letter-spacing:.02em;
}
.hero h1 .line{display:block}
.hero h1 .line:nth-child(2){padding-left:.9em}
.hero h1 em{
  font-style:normal;color:var(--cinnabar);position:relative;z-index:1;
}
.hero h1 em::after{
  content:"";position:absolute;left:-.06em;right:-.06em;bottom:.06em;height:.32em;
  background:rgba(165,50,42,.12);z-index:-1;
}

.hero-desc{
  margin-top:28px;font-size:16px;color:var(--ink-2);
  max-width:30em;line-height:1.95;
}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-top:34px}
.hero-points{display:flex;flex-wrap:wrap;gap:12px 26px;margin-top:30px}
.hero-points li{
  position:relative;padding-left:16px;font-size:14px;color:var(--ink-2);letter-spacing:.04em;
}
.hero-points li::before{
  content:"";position:absolute;left:0;top:.72em;
  width:5px;height:5px;background:var(--cinnabar);transform:rotate(45deg);
}

/* ---------- 人像舞台 ---------- */
.hero-visual{position:relative}
.portrait-stage{
  position:relative;display:flex;align-items:flex-end;justify-content:center;
  min-height:500px;
}
.halo{
  position:absolute;left:50%;top:6%;transform:translateX(-50%);
  width:86%;aspect-ratio:1;border-radius:50%;
  background:radial-gradient(circle, rgba(168,135,79,.20) 0%, rgba(168,135,79,.07) 48%, transparent 70%);
  pointer-events:none;
}
.halo-2{
  width:74%;top:14%;
  border:1px solid rgba(33,31,28,.13);
  background:none;
}
.portrait{
  position:relative;z-index:2;
  width:100%;max-width:452px;height:auto;
  filter:drop-shadow(0 20px 38px rgba(33,31,28,.18));
}
.vertical-note{
  position:absolute;right:2%;top:13%;z-index:3;
  writing-mode:vertical-rl;
  font-family:var(--serif);font-size:14.5px;color:var(--ink-3);
  letter-spacing:.3em;padding:16px 5px;
  border-top:1px solid var(--line-2);
  border-bottom:1px solid var(--line-2);
}
.stage-seal{
  position:absolute;left:5%;bottom:14%;z-index:3;
  display:grid;place-items:center;
  width:36px;height:36px;
  background:var(--cinnabar);color:#fdfbf6;
  font-family:var(--serif);font-size:18px;line-height:1;
  border-radius:2px;transform:rotate(-5deg);
  box-shadow:0 6px 16px rgba(165,50,42,.3);
  box-shadow:inset 0 0 0 1.5px rgba(253,251,246,.3), 0 6px 16px rgba(165,50,42,.3);
}

.hero-tags{
  display:flex;align-items:center;justify-content:center;
  flex-wrap:wrap;gap:12px;margin-top:22px;
}
.tag-solid{
  font-family:var(--serif);font-size:13.5px;color:var(--cinnabar);
  border:1px solid rgba(165,50,42,.34);background:rgba(165,50,42,.05);
  padding:4px 17px;border-radius:2px;letter-spacing:.1em;
}
.tag-sep{width:1px;height:16px;background:var(--line-2)}
.tag-muted{font-size:13px;color:var(--ink-3);letter-spacing:.08em}

/* ---------- 数据 ---------- */
.stats{
  padding:54px 0;
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  background:linear-gradient(180deg, rgba(168,135,79,.04), transparent);
}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);text-align:center}
.stat{position:relative;padding:6px 16px}
.stat + .stat::before{
  content:"";position:absolute;left:0;top:16%;bottom:16%;width:1px;
  background:var(--line);
}
.stat b{
  display:block;font-family:var(--serif);
  font-size:clamp(30px,3.7vw,44px);font-weight:600;line-height:1.2;
  letter-spacing:.02em;
}
.stat b i{font-style:normal;font-size:.44em;color:var(--cinnabar);margin-left:3px}
.stat span{display:block;margin-top:9px;font-size:13px;color:var(--ink-3);letter-spacing:.06em}

/* ---------- 通用区块 ---------- */
.section{padding:94px 0;border-bottom:1px solid var(--line)}
.section-alt{background:var(--paper-2)}
.section-label{
  display:inline-flex;align-items:center;gap:11px;
  font-family:var(--serif);font-size:13px;color:var(--cinnabar);
  letter-spacing:.16em;margin-bottom:18px;
}
.section-label::before{content:"";width:26px;height:1px;background:var(--cinnabar);flex:none}
.section-title{
  font-size:clamp(26px,3.3vw,38px);line-height:1.45;letter-spacing:.02em;
}

/* ---------- 关于我 ---------- */
.about-grid{display:grid;grid-template-columns:.72fr 1.28fr;gap:60px;align-items:start}

.frame{
  position:relative;background:var(--white);padding:14px;
  border:1px solid var(--line-2);
  box-shadow:0 18px 44px rgba(33,31,28,.11);
}
.frame::after{
  content:"";position:absolute;inset:7px;
  border:1px solid rgba(33,31,28,.1);pointer-events:none;
}
.frame img{width:100%;display:block;position:relative;z-index:1}
.frame-caption{
  margin-top:16px;text-align:center;
  font-family:var(--serif);font-size:13px;color:var(--ink-3);
  letter-spacing:.16em;
}

.about-text{margin-top:26px;display:flex;flex-direction:column;gap:16px}
.about-text p{font-size:15.5px;color:var(--ink-2);line-height:2}

.credo{
  margin-top:32px;padding:24px 28px;
  border-left:2px solid var(--cinnabar);
  background:linear-gradient(90deg, rgba(165,50,42,.055), transparent 85%);
  font-size:17.5px;line-height:1.8;color:var(--ink);letter-spacing:.03em;
}

.feature-grid{
  display:grid;grid-template-columns:repeat(4,1fr);
  margin-top:56px;border:1px solid var(--line);background:var(--white);
}
.feature{
  display:flex;gap:14px;align-items:flex-start;
  padding:24px 20px;border-right:1px solid var(--line);
}
.feature:last-child{border-right:none}
.f-index{
  display:grid;place-items:center;flex:none;
  width:27px;height:27px;border-radius:50%;
  border:1px solid rgba(165,50,42,.32);color:var(--cinnabar);
  font-family:var(--serif);font-size:14px;line-height:1;
}
.feature strong{display:block;font-family:var(--serif);font-size:15px;letter-spacing:.04em}
.feature small{display:block;margin-top:5px;font-size:12.5px;color:var(--ink-3);line-height:1.65}

/* ---------- 浙沪特色卡片 ---------- */
.cards{
  display:grid;grid-template-columns:repeat(3,1fr);
  margin-top:46px;border:1px solid var(--line);background:var(--white);
}
.card{
  position:relative;padding:34px 30px;
  border-right:1px solid var(--line);
  transition:background .3s var(--ease);
}
.card:last-child{border-right:none}
.card:hover{background:rgba(168,135,79,.045)}
.card-hot{background:linear-gradient(180deg, rgba(165,50,42,.05), transparent 62%)}
.card:hover::before{
  content:"";position:absolute;top:0;left:0;right:0;height:2px;
  background:var(--cinnabar);
}
.card-tag{
  display:inline-block;font-family:var(--serif);font-size:12px;
  color:var(--ink-3);letter-spacing:.12em;
  border:1px solid var(--line);padding:3px 13px;border-radius:2px;
  margin-bottom:18px;
}
.card-tag.hot{background:var(--cinnabar);border-color:var(--cinnabar);color:#fdfbf6}
.card h3{font-size:20px;letter-spacing:.03em}
.card p{margin-top:12px;font-size:14.5px;color:var(--ink-2);line-height:1.9;min-height:4.2em}
.card-list{
  margin-top:18px;padding-top:16px;border-top:1px solid var(--line);
  display:flex;flex-direction:column;gap:9px;
}
.card-list li{
  position:relative;padding-left:15px;font-size:13.5px;color:var(--ink-3);
}
.card-list li::before{
  content:"";position:absolute;left:0;top:.72em;
  width:4px;height:4px;background:var(--cinnabar);transform:rotate(45deg);
}

/* ---------- 0元试听 ---------- */
.trial-box{display:grid;grid-template-columns:1.05fr .95fr;gap:60px;align-items:center}
.trial-desc{margin:18px 0 30px;font-size:15.5px;color:var(--ink-2);max-width:28em;line-height:1.95}
.trial-right{display:flex;flex-direction:column;border:1px solid var(--line);background:var(--white)}
.trial-step{
  display:flex;gap:18px;align-items:center;
  padding:22px 26px;border-bottom:1px solid var(--line);
}
.trial-step:last-child{border-bottom:none}
.num{
  display:grid;place-items:center;flex:none;
  width:34px;height:34px;border-radius:2px;
  background:var(--cinnabar);color:#fdfbf6;
  font-family:var(--serif);font-size:16px;line-height:1;
}
.trial-step p{font-size:14.5px;color:var(--ink-2);letter-spacing:.03em}

/* ---------- 服务流程 ---------- */
.flow-steps{
  display:grid;grid-template-columns:repeat(4,1fr);
  margin-top:46px;border:1px solid var(--line);background:var(--white);
}
.flow-step{padding:32px 26px;border-right:1px solid var(--line);transition:background .3s}
.flow-step:last-child{border-right:none}
.flow-step:hover{background:rgba(168,135,79,.045)}
.flow-step b{font-family:var(--serif);font-size:14px;color:var(--cinnabar);letter-spacing:.14em;font-weight:600}
.flow-step h4{margin-top:15px;font-size:17.5px;letter-spacing:.03em}
.flow-step p{margin-top:9px;font-size:13.5px;color:var(--ink-3);line-height:1.75}

/* ---------- FAQ ---------- */
.faq-list{margin-top:40px;max-width:840px;border-top:1px solid var(--line-2)}
.faq-list details{border-bottom:1px solid var(--line);padding:22px 2px}
.faq-list summary{
  cursor:pointer;list-style:none;
  display:flex;justify-content:space-between;align-items:center;gap:18px;
  font-family:var(--serif);font-size:16.5px;letter-spacing:.03em;
}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{
  content:"＋";color:var(--ink-3);font-size:16px;transition:color .25s;
  font-family:var(--sans);
}
.faq-list details[open] summary::after{content:"－";color:var(--cinnabar)}
.faq-list p{margin-top:15px;font-size:14.5px;color:var(--ink-2);line-height:1.95;max-width:44em}

/* ---------- 联系 ---------- */
.contact-grid{
  display:grid;grid-template-columns:1fr .78fr;gap:28px;
  margin-top:48px;align-items:start;
}
.contact-info{display:flex;flex-direction:column;border:1px solid var(--line);background:var(--white)}
.contact-item{
  display:flex;gap:18px;align-items:center;
  padding:24px 28px;border-bottom:1px solid var(--line);
}
.contact-item:last-child{border-bottom:none}
.c-mark{
  display:grid;place-items:center;flex:none;
  width:36px;height:36px;border-radius:50%;
  border:1px solid rgba(165,50,42,.32);color:var(--cinnabar);
  font-family:var(--serif);font-size:15px;line-height:1;
}
.contact-item small{display:block;font-size:12.5px;color:var(--ink-3);letter-spacing:.06em}
.contact-item strong{
  display:block;margin-top:4px;
  font-family:var(--serif);font-size:19px;letter-spacing:.06em;
}

.qr-card{
  background:var(--white);border:1px solid var(--line);
  padding:28px;text-align:center;position:relative;
}
.qr-card::after{
  content:"";position:absolute;inset:8px;border:1px solid rgba(33,31,28,.07);
  pointer-events:none;
}
.qr-head{
  display:flex;align-items:center;gap:13px;text-align:left;position:relative;z-index:1;
  padding-bottom:20px;margin-bottom:22px;border-bottom:1px solid var(--line);
}
.qr-head strong{display:block;font-family:var(--serif);font-size:15.5px;letter-spacing:.05em}
.qr-head small{display:block;margin-top:3px;font-size:12px;color:var(--ink-3)}
.qr-img-wrap{
  position:relative;z-index:1;
  background:#fff;border:1px solid var(--line);
  max-width:210px;margin:0 auto;padding:10px;
}
.qr-img-wrap img{width:100%;height:auto}
.qr-tip{position:relative;z-index:1;margin-top:20px;font-family:var(--serif);font-size:15px;letter-spacing:.05em}
.qr-sub{position:relative;z-index:1;margin-top:7px;font-size:12.5px;color:var(--ink-3)}

/* ---------- 页脚 ---------- */
.footer{padding:40px 0;background:var(--paper-2);border-top:1px solid var(--line)}
.footer-inner{
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:14px;
  font-size:13px;color:var(--ink-3);letter-spacing:.05em;
}

/* ---------- 浮标 ---------- */
.float-actions{
  position:fixed;right:24px;bottom:24px;z-index:80;
  display:flex;flex-direction:column;align-items:flex-end;gap:12px;
}
.float-btn{
  display:inline-flex;align-items:center;gap:9px;
  background:var(--cinnabar);color:#fdfbf6;
  font-size:15px;letter-spacing:.06em;
  padding:14px 26px;border-radius:2px;
  box-shadow:0 8px 24px rgba(165,50,42,.3);
  transition:all .25s var(--ease);
}
.float-btn:hover{background:var(--cinnabar-2);transform:translateY(-2px);box-shadow:0 12px 30px rgba(165,50,42,.4)}
.back-top{
  display:grid;place-items:center;
  width:44px;height:44px;border-radius:50%;
  background:var(--white);border:1px solid var(--line-2);
  color:var(--ink-2);font-size:17px;transition:all .25s;
}
.back-top:hover{border-color:var(--ink);color:var(--ink)}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1080px){
  .hero-grid{grid-template-columns:1fr;gap:44px}
  .portrait-stage{min-height:auto}
  .portrait{max-width:400px}
  .hero-tags{margin-top:18px}

  .about-grid{grid-template-columns:1fr;gap:44px}
  .frame{max-width:400px;margin:0 auto}
  .feature-grid{grid-template-columns:1fr 1fr}
  .feature:nth-child(2){border-right:none}
  .feature:nth-child(1),
  .feature:nth-child(2){border-bottom:1px solid var(--line)}

  .cards{grid-template-columns:1fr}
  .card{border-right:none;border-bottom:1px solid var(--line)}
  .card:last-child{border-bottom:none}

  .trial-box{grid-template-columns:1fr;gap:38px}
  .flow-steps{grid-template-columns:1fr 1fr}
  .flow-step:nth-child(2){border-right:none}
  .flow-step:nth-child(1),
  .flow-step:nth-child(2){border-bottom:1px solid var(--line)}
  .contact-grid{grid-template-columns:1fr}
}

@media (max-width:760px){
  .wrap{padding:0 20px}
  .nav-inner{height:68px;gap:16px}
  .nav-links{display:none}
  .nav-phone{display:none}
  .brand-text small{display:none}

  .hero{padding:48px 0 40px}
  .hero h1{font-size:clamp(30px,7.6vw,38px)}
  .hero h1 .line:nth-child(2){padding-left:.4em}
  .hero-desc{font-size:15px}
  .hero-cta{flex-direction:column}
  .hero-cta .btn{width:100%}
  .portrait{max-width:300px}
  .vertical-note{font-size:13px;right:0;letter-spacing:.22em}
  .stage-seal{left:2%;width:32px;height:32px;font-size:16px}

  .stats-grid{grid-template-columns:1fr 1fr;gap:30px 12px}
  .stat + .stat::before{display:none}

  .section{padding:62px 0}
  .about-text p{font-size:15px}
  .credo{padding:20px 22px;font-size:16px}

  .feature-grid{grid-template-columns:1fr}
  .feature{border-right:none;border-bottom:1px solid var(--line)}
  .feature:last-child{border-bottom:none}

  .card{padding:28px 24px}
  .card p{min-height:0}

  .flow-steps{grid-template-columns:1fr}
  .flow-step{border-right:none;border-bottom:1px solid var(--line)}
  .flow-step:last-child{border-bottom:none}

  .trial-step{padding:18px 20px}
  .contact-item{padding:20px 22px}
  .contact-item strong{font-size:17px}
  .qr-card{padding:24px}

  .footer-inner{flex-direction:column;gap:8px}

  .float-actions{right:14px;bottom:14px}
  .float-btn{padding:12px 20px;font-size:14px}
  .back-top{display:none}
}

@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
}