/* LINESURGE — structure & components
   Two-row masthead (brand row above the discipline tabs), full-bleed hero band,
   circular discipline rail, then one horizontal card row per teaching track. */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--ink-2);color:var(--text);
  font-family:"Helvetica Neue",Helvetica,Arial,"Hiragino Kaku Gothic ProN","Noto Sans",sans-serif;
  font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border:0}
a{color:inherit;text-decoration:none}
.wrap{max-width:1280px;margin:0 auto;padding:0 24px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* ---------- header (row 1 brand / row 2 tabs, as reference) ---------- */
.site-header{background:var(--ink-0);position:sticky;top:0;z-index:40;border-bottom:1px solid var(--line)}
.header-inner{max-width:1280px;margin:0 auto;padding:14px 24px;display:flex;align-items:center;gap:24px}
.header-logo{font-size:22px;font-weight:800;letter-spacing:-.4px;white-space:nowrap}
.header-logo em{font-style:normal;color:var(--volt)}
.hdr-search{flex:1;max-width:420px;display:flex;align-items:center;gap:8px;background:var(--ink-4);border-radius:20px;padding:7px 14px}
.hdr-search input{flex:1;background:none;border:0;outline:0;color:var(--text);font-size:13px}
.hdr-search input::placeholder{color:var(--text-3)}
.hdr-search svg{width:14px;height:14px;fill:var(--text-3);flex:none}
.hdr-side{margin-left:auto;display:flex;align-items:center;gap:20px;font-size:13px;color:var(--text-2)}
.hdr-side a:hover{color:var(--volt)}
.header-nav{max-width:1280px;margin:0 auto;padding:0 24px 12px;display:flex;align-items:center;gap:26px;overflow-x:auto}
.nav-burger{display:flex;align-items:center;gap:9px;font-size:13px;color:var(--text-2);padding-right:6px}
.nav-burger i{display:block;width:16px;height:10px;border-top:2px solid var(--text-2);border-bottom:2px solid var(--text-2);position:relative}
.nav-burger i::after{content:"";position:absolute;top:3px;left:0;width:16px;height:2px;background:var(--text-2)}
.nav-link{font-size:13.5px;color:var(--text-2);white-space:nowrap;padding:4px 0;font-weight:500}
.nav-link:hover{color:#fff}
.nav-link.is-hot{color:#fff;font-weight:700}
.nav-link.is-hot::after{content:"";display:inline-block;width:4px;height:4px;border-radius:50%;background:var(--magenta);vertical-align:super;margin-left:3px}

/* ---------- hero band ---------- */
.hero{position:relative;min-height:400px;display:flex;align-items:center;overflow:hidden;
  background:linear-gradient(115deg,var(--hero-c) 0%,var(--hero-a) 45%,var(--hero-b) 100%)}
.hero-art{position:absolute;inset:0;left:46%;background-size:cover;background-position:center;opacity:.62;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 22%);mask-image:linear-gradient(90deg,transparent,#000 22%)}
.hero-inner{position:relative;max-width:1280px;margin:0 auto;padding:56px 24px;width:100%}
.hero-kicker{font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--text-3);margin:0 0 18px}
.hero h1{margin:0;font-size:40px;line-height:1.25;font-weight:700;max-width:620px}
.hero h1 span{display:block}
.hero h1 b{color:var(--volt);font-weight:700}
.hero-sub{margin:16px 0 0;color:var(--text-2);max-width:520px;font-size:15px}
.hero-pager{display:flex;align-items:center;gap:14px;margin-top:34px;font-size:12px;color:var(--text-3)}
.hero-pager b{color:#fff;font-weight:700}
.hero-rule{flex:1;max-width:420px;height:1px;background:var(--line-soft);position:relative}
.hero-rule::after{content:"";position:absolute;left:0;top:0;width:34%;height:1px;background:var(--volt)}

/* ---------- circular category rail ---------- */
.rail{background:var(--ink-1);padding:34px 0}
.rail-list{display:flex;justify-content:space-between;gap:12px;overflow-x:auto;list-style:none;margin:0;padding:0}
.rail-list li{flex:1;min-width:88px;text-align:center}
.rail-ic{width:62px;height:62px;margin:0 auto 10px;border-radius:50%;background:var(--ink-4);
  display:flex;align-items:center;justify-content:center;font-size:19px;font-weight:800;color:var(--text-2);
  border:1px solid var(--line);transition:.18s}
.rail-list li:hover .rail-ic{border-color:var(--volt);color:var(--volt);transform:translateY(-3px)}
.rail-list span{font-size:12px;color:var(--text-2);display:block}

/* ---------- section shell ---------- */
.sec{padding:44px 0}
.sec-alt{background:var(--ink-1)}
.sec-head{display:flex;align-items:baseline;gap:14px;margin:0 0 22px}
.sec-head h2{margin:0;font-size:21px;font-weight:700;letter-spacing:-.2px}
.sec-head .badge{font-size:10px;font-weight:800;letter-spacing:.1em;color:var(--ink-0);background:var(--volt);padding:3px 7px;border-radius:3px}
.sec-head .more{margin-left:auto;font-size:12.5px;color:var(--text-3)}
.sec-head .more:hover{color:var(--volt)}
.sec-lead{margin:-10px 0 24px;color:var(--text-3);max-width:660px;font-size:14px}

/* ---------- course cards ---------- */
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.cards-3{grid-template-columns:repeat(3,1fr)}
.cards-2{grid-template-columns:repeat(2,1fr)}
.ccard{background:var(--ink-3);border:1px solid var(--line);border-radius:6px;overflow:hidden;transition:.18s}
.ccard:hover{transform:translateY(-4px);border-color:var(--line-soft)}
.ccard-thumb{position:relative;aspect-ratio:16/10;overflow:hidden;background:var(--ink-4)}
.ccard-thumb img{width:100%;height:100%;object-fit:cover}
.ccard-flag{position:absolute;left:0;top:0;font-size:10.5px;font-weight:800;letter-spacing:.06em;padding:4px 9px;
  background:var(--tag-open);color:var(--ink-0)}
.ccard-flag.is-soon{background:var(--tag-soon);color:var(--text-2)}
.ccard-flag.is-live{background:var(--tag-live);color:#fff}
.ccard-body{padding:14px 15px 17px}
.ccard-disc{font-size:11px;color:var(--volt);letter-spacing:.08em;text-transform:uppercase;margin:0 0 7px}
.ccard-title{margin:0;font-size:14.5px;line-height:1.45;font-weight:700}
.ccard-tutor{margin:11px 0 0;font-size:12px;color:var(--text-3)}
.ccard-foot{margin-top:12px;display:flex;align-items:center;gap:9px;font-size:12px;color:var(--text-2)}
.ccard-foot .price{font-weight:800;color:#fff}
.ccard-foot .was{text-decoration:line-through;color:var(--text-3);font-size:11px}
.ccard-foot .off{color:var(--magenta);font-weight:800}

/* ---------- discipline block ---------- */
.disc{border-top:1px solid var(--line);padding:40px 0}
.disc-title{display:flex;align-items:center;gap:11px;margin:0 0 6px;font-size:19px;font-weight:700}
.disc-title .badge{font-size:10px;font-weight:800;background:var(--ink-4);color:var(--volt);padding:3px 7px;border-radius:3px;letter-spacing:.08em}

/* ---------- generic content page ---------- */
.page-head{background:var(--ink-1);border-bottom:1px solid var(--line);padding:44px 0 38px}
.page-head h1{margin:0 0 10px;font-size:31px;font-weight:700}
.page-head p{margin:0;color:var(--text-3);max-width:680px}
.prose{padding:40px 0 56px;max-width:820px}
.prose h2{font-size:20px;margin:34px 0 12px;font-weight:700}
.prose h3{font-size:16px;margin:24px 0 8px;font-weight:700;color:var(--text-2)}
.prose p,.prose li{color:var(--text-2);font-size:14.5px}
.prose ul{padding-left:20px}
.prose a{color:var(--volt);text-decoration:underline}
.table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14px}
.table th,.table td{border:1px solid var(--line);padding:10px 12px;text-align:left;color:var(--text-2)}
.table th{background:var(--ink-3);color:#fff;font-weight:700}

/* ---------- faculty ---------- */
.fac{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.fac-card{background:var(--ink-3);border:1px solid var(--line);border-radius:6px;overflow:hidden}
.fac-card img{aspect-ratio:4/3;object-fit:cover;width:100%}
.fac-body{padding:15px 16px 18px}
.fac-body h3{margin:0 0 4px;font-size:15px}
.fac-role{margin:0 0 10px;font-size:12px;color:var(--volt)}
.fac-body p{margin:0;font-size:13px;color:var(--text-3)}

/* ---------- form ---------- */
.form{display:grid;gap:14px;max-width:560px}
.form label{font-size:12.5px;color:var(--text-2);display:block;margin-bottom:6px}
.form input,.form select,.form textarea{width:100%;background:var(--ink-3);border:1px solid var(--line);
  border-radius:4px;padding:11px 12px;color:var(--text);font:inherit;font-size:14px}
.form input:focus,.form select:focus,.form textarea:focus{outline:0;border-color:var(--volt)}
.form textarea{min-height:130px;resize:vertical}
.btn{display:inline-block;background:var(--volt);color:var(--ink-0);font-weight:800;font-size:14px;
  padding:12px 26px;border:0;border-radius:4px;cursor:pointer;justify-self:start}
.btn:hover{background:#fff}
.btn-ghost{background:none;border:1px solid var(--line-soft);color:var(--text)}
.btn-ghost:hover{border-color:var(--volt);color:var(--volt);background:none}
.info-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:26px 0 0}
.info-card{background:var(--ink-3);border:1px solid var(--line);border-radius:6px;padding:18px}
.info-card h3{margin:0 0 8px;font-size:14px}
.info-card p{margin:0;font-size:13px;color:var(--text-3)}

/* ---------- footer ----------
   .footer-nav-inner drives the multi-column sitemap block.
   .footer-inner / .footer-bottom stay simple centred containers so long-form
   pages reuse them for a plain copyright strip. */
.site-footer{background:var(--footer-bg);color:var(--footer-text);margin-top:0}
.footer-nav-inner{max-width:1280px;margin:0 auto;padding:38px 24px 26px;display:grid;
  grid-template-columns:repeat(5,1fr);gap:26px}
.footer-col h4{margin:0 0 12px;font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:#fff}
.footer-col ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.footer-col a{font-size:13px;color:var(--footer-text)}
.footer-col a:hover{color:#fff;text-decoration:underline}
.footer-inner{max-width:900px;margin:0 auto;padding:24px;text-align:center}
.footer-bottom{max-width:900px;margin:0 auto;padding:16px 24px 30px;text-align:center;font-size:12px;color:#a9a9b2;
  border-top:1px solid #454545}
.footer-bottom p{margin:4px 0}

@media (max-width:1000px){
  .cards,.cards-3{grid-template-columns:repeat(2,1fr)}
  .fac,.info-grid{grid-template-columns:repeat(2,1fr)}
  .footer-nav-inner{grid-template-columns:repeat(3,1fr)}
  .hero h1{font-size:31px}
}
@media (max-width:640px){
  .cards,.cards-3,.cards-2,.fac,.info-grid{grid-template-columns:1fr}
  .footer-nav-inner{grid-template-columns:repeat(2,1fr)}
  .hdr-search{display:none}
  .hero h1{font-size:26px}
  .header-inner{gap:14px}
}