/* 双流赵师傅 · 共用样式（主页与课程子页共用，改一处全站生效） */
:root{
  --bg:#0a0a0c;
  --bg-soft:#121216;
  --bg-card:#14141a;
  --line:#24242c;
  --line-soft:#1c1c22;
  --text:#f2f2f4;
  --muted:#8b8b96;
  --dim:#55555f;
  --accent:#ff4d3d;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  -webkit-font-smoothing:antialiased;
  line-height:1.7;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
.wrap{max-width:1080px;margin:0 auto;padding:0 32px}

/* 顶栏 */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(10,10,12,.82);
  backdrop-filter:saturate(160%) blur(14px);
  -webkit-backdrop-filter:saturate(160%) blur(14px);
  border-bottom:1px solid var(--line-soft);
}
.nav .wrap{
  display:flex;align-items:center;justify-content:space-between;
  height:64px;gap:20px;
}
.nav .brand{font-weight:750;font-size:17px;letter-spacing:-.01em}
.nav .links{display:flex;gap:26px;font-size:14px;color:var(--muted)}
.nav .links a:hover{color:var(--text)}
.nav .back{font-size:14px;color:var(--accent)}

/* 首屏 */
.hero{
  min-height:100vh;
  display:flex;flex-direction:column;justify-content:center;
  position:relative;border-bottom:1px solid var(--line);
}
.hero::before{
  content:"";position:absolute;top:-30%;right:-20%;
  width:70vw;height:70vw;max-width:900px;max-height:900px;
  background:radial-gradient(circle,rgba(255,77,61,.16),transparent 62%);
  filter:blur(20px);pointer-events:none;
}
.hero .wrap{position:relative;z-index:1;padding-top:80px;padding-bottom:80px}
.eyebrow{font-size:14px;letter-spacing:.28em;color:var(--accent);text-transform:uppercase;margin-bottom:32px}
.hero h1{font-size:clamp(56px,11vw,132px);font-weight:800;line-height:1.02;letter-spacing:-.03em;margin-bottom:28px}
.hero h1 em{font-style:normal;color:var(--accent)}
.tagline{font-size:clamp(20px,2.6vw,30px);color:var(--muted);max-width:760px;font-weight:400}
.tagline strong{color:var(--text);font-weight:600}
.scroll{margin-top:72px;font-size:13px;letter-spacing:.22em;color:var(--dim)}

/* 区块 */
section{padding:120px 0;border-bottom:1px solid var(--line)}
section:last-of-type{border-bottom:none}
.num{font-size:13px;letter-spacing:.24em;color:var(--accent);margin-bottom:20px}
h2{font-size:clamp(34px,5vw,58px);font-weight:750;line-height:1.15;letter-spacing:-.02em;margin-bottom:40px}
p.lead{font-size:clamp(18px,2.1vw,24px);color:#c9c9d1;max-width:820px;margin-bottom:24px}
p.lead.sub{color:var(--muted);font-size:clamp(16px,1.7vw,20px)}
.note{font-size:14px;color:var(--dim);margin-top:28px}

/* 卡片 */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px;margin-top:8px}
.card{
  background:var(--bg-soft);border:1px solid var(--line);border-radius:16px;
  padding:32px 28px;transition:border-color .25s ease,transform .25s ease;
  display:block;
}
a.card:hover{border-color:#3a3a46;transform:translateY(-3px)}
.card h3{font-size:22px;font-weight:650;margin-bottom:12px}
.card p{font-size:16px;color:var(--muted)}
.card .kicker{font-size:12px;letter-spacing:.2em;color:var(--accent);margin-bottom:14px}
.card .more{font-size:14px;color:var(--accent);margin-top:18px;letter-spacing:.06em}

/* 账号 / 联系行 */
.accounts{display:flex;flex-direction:column;margin-top:20px}
.account{
  display:flex;align-items:baseline;justify-content:space-between;gap:24px;
  padding:32px 0;border-top:1px solid var(--line);transition:padding-left .25s ease;flex-wrap:wrap;
}
.account:hover{padding-left:8px}
.account:last-child{border-bottom:1px solid var(--line)}
.account .name{font-size:clamp(24px,3.2vw,36px);font-weight:700}
.account .desc{font-size:16px;color:var(--muted);flex:1;min-width:200px}
.account .go{font-size:14px;color:var(--accent);letter-spacing:.1em;white-space:nowrap}

.contact-lines{margin-top:12px}
.contact-line{
  font-size:clamp(18px,2.2vw,26px);padding:22px 0;border-top:1px solid var(--line);
  display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;
}
.contact-line:last-child{border-bottom:1px solid var(--line)}
.contact-line span:first-child{color:var(--muted);font-size:15px;letter-spacing:.1em;align-self:center}
.contact-line span:last-child{font-weight:600}

/* 课程子页 */
.course-head{padding:96px 0 72px;border-bottom:1px solid var(--line);position:relative}
.course-head::before{
  content:"";position:absolute;top:-40%;right:-15%;width:60vw;height:60vw;
  max-width:760px;max-height:760px;
  background:radial-gradient(circle,rgba(255,77,61,.13),transparent 62%);
  filter:blur(20px);pointer-events:none;
}
.course-head .wrap{position:relative;z-index:1}
.course-head h1{
  font-size:clamp(38px,6.4vw,76px);font-weight:800;line-height:1.08;
  letter-spacing:-.025em;margin:14px 0 24px;
}
.course-head .oneline{font-size:clamp(18px,2.2vw,26px);color:var(--muted);max-width:760px}
.course-head .oneline strong{color:var(--text)}

/* 信息条 */
.facts{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));
  gap:1px;background:var(--line);border:1px solid var(--line);border-radius:14px;
  overflow:hidden;margin-top:48px;
}
.fact{background:var(--bg-soft);padding:24px 22px}
.fact .k{font-size:12px;letter-spacing:.18em;color:var(--muted);margin-bottom:8px}
.fact .v{font-size:19px;font-weight:650}
.fact .v small{display:block;font-size:13px;color:var(--dim);font-weight:400;margin-top:4px}

/* 清单 */
.block{margin-top:8px}
.block + .block{margin-top:56px}
.block h3{font-size:24px;font-weight:680;margin-bottom:18px}
.list{list-style:none}
.list li{
  padding:16px 0 16px 26px;border-bottom:1px solid var(--line-soft);
  position:relative;font-size:17px;color:#d3d3da;
}
.list li:last-child{border-bottom:none}
.list li::before{
  content:"";position:absolute;left:0;top:26px;
  width:8px;height:8px;border-radius:50%;background:var(--accent);opacity:.75;
}
.list li b{color:var(--text);font-weight:640}
.list li span{color:var(--muted);font-size:15px;display:block;margin-top:2px}

/* 价格表 */
.price-table{width:100%;border-collapse:collapse;margin-top:8px}
.price-table th,.price-table td{
  text-align:left;padding:16px 18px;border-bottom:1px solid var(--line-soft);font-size:16px;
}
.price-table th{color:var(--muted);font-size:13px;letter-spacing:.14em;font-weight:500}
.price-table td:first-child{color:#d3d3da}
.price-table tr:last-child td{border-bottom:none}

/* CTA */
.cta{
  margin-top:64px;padding:40px;border:1px solid var(--line);border-radius:18px;
  background:linear-gradient(135deg,#16161c,#101014);
}
.cta h3{font-size:26px;font-weight:700;margin-bottom:12px}
.cta p{color:var(--muted);font-size:16px;margin-bottom:22px}
.btn{
  display:inline-block;padding:14px 30px;border-radius:999px;
  background:var(--accent);color:#fff;font-weight:650;font-size:16px;
  transition:transform .2s ease,opacity .2s ease;
}
.btn:hover{transform:translateY(-2px);opacity:.92}
.btn.ghost{background:transparent;border:1px solid var(--line);color:var(--text);margin-left:12px}

/* 页脚 */
footer{padding:60px 0 80px;color:#4a4a55;font-size:14px}
footer .wrap{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap}
footer a:hover{color:var(--muted)}

/* 进场 */
/* 无进场动画：内容永远可见（此前的滚动动画在全页截图/慢设备上会闪成空白） */

@media (max-width:640px){
  .wrap{padding:0 22px}
  section{padding:80px 0}
  .hero .wrap{padding-top:60px;padding-bottom:60px}
  .scroll{margin-top:48px}
  .course-head{padding:64px 0 48px}
  .nav .links{display:none}
  .cta{padding:28px 22px}
  .btn.ghost{margin-left:0;margin-top:12px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
}