/* ============================================================
   course.css — Giao diện trang khoá học (tím–xanh, khớp home)
   Dùng chung cho khoa-hoc.html & starter.html
   ============================================================ */
:root{
  --bg:#0a0812; --bg-2:#100c1c;
  --surface:rgba(255,255,255,.045); --surface-2:rgba(255,255,255,.07);
  --line:rgba(167,139,250,.16); --line-2:rgba(255,255,255,.1);
  --ink:#f3f0fb; --ink-2:#b7b1cc; --ink-3:#837d99;
  --violet:#9b6dff; --violet-lt:#b89bff; --cyan:#36d3f0; --cyan-lt:#6ee4f7;
  --grad:linear-gradient(110deg,#b89bff 0%,#7c5cff 38%,#36d3f0 100%);
  --grad-soft:linear-gradient(110deg,#9b6dff,#36d3f0);
  --glow-v:rgba(155,109,255,.5); --glow-c:rgba(54,211,240,.45);
  --maxw:1180px;
  --sans:"Be Vietnam Pro",-apple-system,system-ui,sans-serif;
  --serif:"Lora",Georgia,serif;
  --mono:"JetBrains Mono",ui-monospace,monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--sans);background:var(--bg);color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
em{font-family:var(--serif);font-style:italic;font-weight:500;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
::selection{background:var(--violet);color:#fff}

/* backgrounds */
.bg-aurora{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.aur{position:absolute;border-radius:50%;filter:blur(70px);opacity:.7;mix-blend-mode:screen}
.aur-1{width:62vw;height:62vw;left:-14vw;top:-20vw;background:radial-gradient(circle,#8b5cff,transparent 62%);animation:aur1 18s var(--ease) infinite alternate}
.aur-2{width:54vw;height:54vw;right:-14vw;top:2vh;background:radial-gradient(circle,#22b8e8,transparent 62%);animation:aur2 22s var(--ease) infinite alternate}
.aur-3{width:48vw;height:48vw;left:20vw;top:60vh;background:radial-gradient(circle,#d24ad8,transparent 64%);opacity:.45;animation:aur3 26s var(--ease) infinite alternate}
@keyframes aur1{to{transform:translate(10vw,12vh) scale(1.2)}}
@keyframes aur2{to{transform:translate(-9vw,8vh) scale(1.15)}}
@keyframes aur3{to{transform:translate(-12vw,-10vh) scale(1.25)}}
.bg-grid{position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:linear-gradient(rgba(167,139,250,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(167,139,250,.06) 1px,transparent 1px);
  background-size:58px 58px;
  -webkit-mask-image:radial-gradient(ellipse 90% 60% at 50% 0%,#000 25%,transparent 80%);
  mask-image:radial-gradient(ellipse 90% 60% at 50% 0%,#000 25%,transparent 80%)}
.bg-grain{position:fixed;inset:0;z-index:1;pointer-events:none;opacity:.32;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.5'/%3E%3C/svg%3E")}
.wrap{position:relative;z-index:2}
.container{max-width:var(--maxw);margin:0 auto;padding:0 28px}
@media(max-width:600px){.container{padding:0 20px}}

/* nav */
header{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px) saturate(1.4);background:rgba(10,8,18,.7);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:11px;font-weight:800;font-size:18px;letter-spacing:-.02em;color:var(--ink)}
.brand .mark{width:34px;height:34px;border-radius:9px;display:grid;place-items:center;background:var(--grad-soft);color:#fff;font-weight:800;font-size:14px;box-shadow:0 4px 16px var(--glow-v)}
.nav-links{display:flex;gap:28px;align-items:center}
.nav-links a{color:var(--ink-2);font-size:14.5px;font-weight:500;transition:color .2s}
.nav-links a:hover{color:var(--ink)}
.btn{display:inline-flex;align-items:center;gap:9px;cursor:pointer;border:none;font-family:var(--sans);font-weight:600;font-size:15px;padding:13px 24px;border-radius:999px;transition:transform .2s,box-shadow .2s,filter .2s}
.btn-gold{background:var(--grad-soft);color:#fff;box-shadow:0 8px 26px -8px var(--glow-v),inset 0 0 0 1px rgba(255,255,255,.15)}
.btn-gold:hover{transform:translateY(-2px);filter:brightness(1.08);box-shadow:0 16px 40px -10px var(--glow-v),0 0 24px -6px var(--glow-c)}
.btn-ghost{background:transparent;color:var(--ink);border:1px solid var(--line-2)}
.btn-ghost:hover{border-color:var(--violet);color:var(--violet-lt)}
.nav .btn{padding:11px 22px}
@media(max-width:860px){.nav-links a:not(.btn){display:none}}

/* reveal + load anim */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.reveal.in{opacity:1;transform:none}
@keyframes fadeUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none}.aur{animation:none}}

/* hero */
.hero{padding:96px 0 70px;position:relative}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--mono);font-size:12.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--cyan-lt);font-weight:500;margin-bottom:28px}
.eyebrow::before{content:"";width:28px;height:1.5px;background:var(--grad-soft)}
h1{font-family:var(--sans);font-weight:800;letter-spacing:-.035em;line-height:1.04;font-size:clamp(40px,6.2vw,74px);max-width:15ch}
h1 em{font-weight:600}
.hero-sub{margin-top:28px;max-width:54ch;font-size:clamp(17px,2vw,20px);color:var(--ink-2);line-height:1.6}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-top:38px}
.credit{display:inline-flex;align-items:center;gap:14px;margin-top:40px;padding:14px 20px 14px 14px;border:1px solid var(--line);border-radius:14px;background:var(--surface);max-width:560px;backdrop-filter:blur(8px)}
.credit .ava{width:50px;height:50px;border-radius:50%;flex:none;display:grid;place-items:center;background:var(--grad-soft);color:#fff;font-weight:800;font-size:20px;overflow:hidden}
.credit .ava img{width:100%;height:100%;object-fit:cover;object-position:center top}
.credit p{font-size:14.5px;color:var(--ink-2);line-height:1.45}
.credit p strong{color:var(--ink);font-weight:600}
.credit p span{color:var(--cyan-lt)}

/* stat strip */
.stats{margin-top:60px;display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);border-radius:18px;overflow:hidden;background:var(--surface);backdrop-filter:blur(8px)}
.stat{padding:32px 30px;border-right:1px solid var(--line)}
.stat:last-child{border-right:none}
.stat .num{font-family:var(--sans);font-size:clamp(26px,3.4vw,34px);font-weight:800;letter-spacing:-.02em;line-height:1.05;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat .lbl{margin-top:10px;color:var(--ink-3);font-size:14px;line-height:1.45}
@media(max-width:760px){.stats{grid-template-columns:1fr}.stat{border-right:none;border-bottom:1px solid var(--line)}.stat:last-child{border-bottom:none}}

/* sections */
section{position:relative;padding:88px 0}
.sec-tag{font-family:var(--mono);font-size:12.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--cyan-lt);font-weight:500;margin-bottom:18px}
.sec-tag::before{content:"";display:inline-block;width:22px;height:1.5px;background:var(--grad-soft);vertical-align:middle;margin-right:9px}
h2{font-family:var(--sans);font-weight:800;letter-spacing:-.025em;line-height:1.1;font-size:clamp(30px,4.2vw,48px);max-width:18ch}
.lead{margin-top:22px;max-width:60ch;color:var(--ink-2);font-size:17.5px;line-height:1.7}
.divider{height:1px;background:linear-gradient(90deg,transparent,var(--line),transparent);max-width:var(--maxw);margin:0 auto}

/* problem */
.problem{background:linear-gradient(180deg,transparent,rgba(16,12,28,.5),transparent)}
.prob-grid{display:grid;grid-template-columns:1fr 1fr;gap:54px;align-items:start;margin-top:46px}
.prob-list{list-style:none;display:grid;gap:18px}
.prob-list li{display:flex;gap:14px;color:var(--ink-2);font-size:16px;line-height:1.55}
.prob-list li .x{color:var(--violet-lt);flex:none;font-weight:700;margin-top:2px}
.prob-flip{background:linear-gradient(150deg,rgba(124,92,255,.16),rgba(54,211,240,.07));border:1px solid var(--line-2);border-radius:18px;padding:38px;backdrop-filter:blur(8px)}
.prob-flip h3{font-family:var(--sans);font-size:24px;font-weight:800;line-height:1.25;margin-bottom:16px;letter-spacing:-.01em}
.prob-flip p{color:var(--ink-2);font-size:16px}
@media(max-width:820px){.prob-grid{grid-template-columns:1fr;gap:34px}}

/* pillars */
.pillars{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:50px}
.pillar{border:1px solid var(--line);border-radius:18px;padding:34px 30px;background:var(--surface);backdrop-filter:blur(8px);transition:transform .3s,border-color .3s,background .3s}
.pillar:hover{transform:translateY(-6px);border-color:var(--line-2);background:var(--surface-2)}
.pillar .pn{font-family:var(--mono);font-size:14px;background:var(--grad-soft);-webkit-background-clip:text;background-clip:text;color:transparent;font-weight:700;letter-spacing:.05em}
.pillar h3{font-family:var(--sans);font-size:22px;font-weight:800;margin:16px 0 12px;line-height:1.25;letter-spacing:-.01em}
.pillar p{color:var(--ink-2);font-size:15.5px;line-height:1.6}
@media(max-width:860px){.pillars{grid-template-columns:1fr}}

/* USP */
.usp{border:1px solid var(--line-2);border-radius:24px;overflow:hidden;position:relative;background:linear-gradient(140deg,rgba(124,92,255,.16),rgba(54,211,240,.07));padding:56px;display:grid;grid-template-columns:1.3fr .9fr;gap:48px;align-items:center;backdrop-filter:blur(8px)}
.usp::before{content:"";position:absolute;top:-30%;right:-10%;width:50%;height:80%;background:radial-gradient(circle,var(--glow-v),transparent 70%);opacity:.5;pointer-events:none}
.usp .badge{position:relative;display:inline-block;font-family:var(--mono);font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--cyan-lt);font-weight:500;margin-bottom:18px}
.usp h2{position:relative;font-size:clamp(28px,3.6vw,42px)}
.usp p{position:relative;margin-top:20px;color:var(--ink-2);font-size:17px;line-height:1.7}
.usp-num{text-align:center;position:relative}
.usp-num .big{font-family:var(--sans);font-size:clamp(80px,14vw,150px);font-weight:800;line-height:.85;letter-spacing:-.04em;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;text-shadow:0 8px 50px rgba(124,92,255,.4)}
.usp-num .cap{margin-top:14px;color:var(--ink);font-size:18px;font-weight:600}
.usp-num .sub{color:var(--ink-3);font-size:14px;margin-top:4px}
@media(max-width:820px){.usp{grid-template-columns:1fr;padding:38px;gap:30px}.usp-num{order:-1}}

/* curriculum */
.curr{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:50px}
.item{display:flex;gap:20px;padding:30px;border:1px solid var(--line);border-radius:16px;background:var(--surface);backdrop-filter:blur(8px);transition:border-color .3s,transform .3s}
.item:hover{border-color:var(--line-2);transform:translateY(-4px)}
.item .ic{width:46px;height:46px;flex:none;border-radius:12px;display:grid;place-items:center;font-family:var(--sans);font-weight:800;font-size:18px;color:var(--cyan-lt);border:1px solid var(--line);background:rgba(155,109,255,.1)}
.item h3{font-family:var(--sans);font-size:20px;font-weight:800;margin-bottom:8px;letter-spacing:-.01em}
.item p{color:var(--ink-2);font-size:15px;line-height:1.55}
@media(max-width:760px){.curr{grid-template-columns:1fr}}

/* results */
.results{background:linear-gradient(180deg,transparent,rgba(16,12,28,.5),transparent)}
.note{margin-top:24px;display:inline-block;font-family:var(--mono);font-size:12.5px;color:var(--ink-3);border:1px dashed var(--line);border-radius:10px;padding:9px 14px}
.res-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:46px}
.res{border:1px solid var(--line);border-radius:16px;padding:30px;background:var(--surface);backdrop-filter:blur(8px)}
.res .dept{font-family:var(--mono);font-size:12.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--cyan-lt);font-weight:500}
.res .before{margin-top:14px;color:var(--ink-3);font-size:14.5px}
.res .after{margin-top:12px;color:var(--ink);font-size:15.5px;line-height:1.5}
.res .after b{background:var(--grad-soft);-webkit-background-clip:text;background-clip:text;color:transparent;font-weight:700}
@media(max-width:860px){.res-grid{grid-template-columns:1fr}}

/* instructor */
.inst{display:grid;grid-template-columns:.8fr 1.2fr;gap:54px;align-items:center}
.inst-card{border:1px solid var(--line);border-radius:22px;padding:44px;text-align:center;background:radial-gradient(400px 300px at 50% 0%,rgba(124,92,255,.18),transparent),var(--surface);backdrop-filter:blur(8px)}
.inst-card .photo{width:130px;height:160px;border-radius:18px;margin:0 auto 22px;overflow:hidden;position:relative;background:#0c0a18;box-shadow:0 16px 50px -12px var(--glow-v)}
.inst-card .photo img{width:100%;height:100%;object-fit:cover;object-position:center top}
.inst-card .photo::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 50%,rgba(124,92,255,.28));mix-blend-mode:screen}
.inst-card .nm{font-family:var(--sans);font-size:26px;font-weight:800;letter-spacing:-.01em}
.inst-card .role{color:var(--cyan-lt);font-size:15px;margin-top:6px;font-weight:500}
.inst-text h2{margin-bottom:8px}
.inst-text p{color:var(--ink-2);font-size:17px;line-height:1.7;margin-top:18px}
.inst-quote{font-family:var(--serif);font-style:italic;font-size:1.35rem;line-height:1.4;color:var(--ink) !important;border-left:3px solid transparent;border-image:var(--grad) 1;padding-left:22px;margin-top:24px !important;max-width:34ch}
@media(max-width:820px){.inst{grid-template-columns:1fr;gap:34px}}

/* pricing */
.price-wrap{display:flex;justify-content:center;margin-top:50px}
.price{width:100%;max-width:620px;border:1px solid var(--line-2);border-radius:26px;overflow:hidden;background:linear-gradient(160deg,rgba(20,16,32,.9),rgba(12,9,22,.95));box-shadow:0 30px 80px -30px rgba(124,92,255,.5)}
.price .top{padding:42px 44px 34px;border-bottom:1px solid var(--line);text-align:center;position:relative}
.price .top::before{content:"";position:absolute;inset:0;background:radial-gradient(360px 200px at 50% -30%,rgba(155,109,255,.3),transparent)}
.price .kicker{position:relative;font-family:var(--mono);font-size:12.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--cyan-lt);font-weight:500}
.price .amount{position:relative;font-family:var(--sans);font-size:clamp(48px,8vw,68px);font-weight:800;letter-spacing:-.03em;line-height:1;margin:16px 0 6px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.price .amount span{font-size:24px;-webkit-text-fill-color:var(--ink-3);vertical-align:super}
.price .for{position:relative;color:var(--ink-2);font-size:15.5px}
.price .for b{color:var(--ink)}
.price .body{padding:34px 44px 42px}
.incl{list-style:none;display:grid;gap:15px;margin-bottom:30px}
.incl li{display:flex;gap:13px;font-size:15.5px;color:var(--ink)}
.incl li .ck{color:var(--cyan-lt);flex:none;font-weight:800}
.price .btn{width:100%;justify-content:center;font-size:16.5px;padding:17px}
.price .fine{text-align:center;color:var(--ink-3);font-size:13px;margin-top:16px}

/* roadmap (starter) */
.road{margin-top:50px;display:grid;gap:22px}
.phase{display:grid;grid-template-columns:auto 1fr;gap:30px;align-items:start}
.phase .rail{display:flex;flex-direction:column;align-items:center;gap:8px;padding-top:6px}
.phase .node{width:54px;height:54px;border-radius:50%;display:grid;place-items:center;flex:none;font-family:var(--sans);font-weight:800;font-size:15px;color:#fff;background:var(--grad-soft);box-shadow:0 6px 24px -6px var(--glow-v)}
.phase .line{width:2px;flex:1;background:linear-gradient(var(--line-2),transparent);min-height:30px}
.phase:last-child .line{display:none}
.phase .card{border:1px solid var(--line);border-radius:18px;padding:30px 32px;background:var(--surface);backdrop-filter:blur(8px);transition:border-color .3s,transform .3s}
.phase .card:hover{border-color:var(--line-2);transform:translateY(-3px)}
.phase .days{font-family:var(--mono);font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--cyan-lt);font-weight:500}
.phase .card h3{font-family:var(--sans);font-size:23px;font-weight:800;margin:8px 0 12px;letter-spacing:-.01em}
.phase .card p{color:var(--ink-2);font-size:15.5px;line-height:1.6}
.phase .tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.phase .tags span{font-size:13px;color:var(--ink);border:1px solid var(--line);border-radius:8px;padding:6px 12px;background:rgba(155,109,255,.08)}
@media(max-width:680px){.phase{grid-template-columns:1fr}.phase .rail{flex-direction:row;padding:0 0 4px}.phase .line{display:none}}

/* who-for (starter) */
.who{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:46px}
.who .c{border:1px solid var(--line);border-radius:16px;padding:30px;background:var(--surface);backdrop-filter:blur(8px)}
.who .c .ic{font-size:30px;background:var(--grad-soft);-webkit-background-clip:text;background-clip:text;color:transparent}
.who .c h3{font-family:var(--sans);font-size:19px;font-weight:800;margin:14px 0 8px;letter-spacing:-.01em}
.who .c p{color:var(--ink-2);font-size:15px;line-height:1.55}
@media(max-width:860px){.who{grid-template-columns:1fr}}

/* inside (starter) */
.inside{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:46px}
.ins{display:flex;gap:18px;padding:26px;border:1px solid var(--line);border-radius:14px;background:var(--surface);backdrop-filter:blur(8px);transition:border-color .3s,transform .3s}
.ins:hover{border-color:var(--line-2);transform:translateY(-3px)}
.ins .ic{width:42px;height:42px;flex:none;border-radius:11px;display:grid;place-items:center;font-family:var(--sans);font-weight:800;font-size:17px;color:var(--cyan-lt);border:1px solid var(--line);background:rgba(155,109,255,.1)}
.ins h3{font-family:var(--sans);font-size:18px;font-weight:800;margin-bottom:6px;letter-spacing:-.01em}
.ins p{color:var(--ink-2);font-size:14.5px;line-height:1.55}
@media(max-width:680px){.inside{grid-template-columns:1fr}}

/* hero-grid + buy card (starter) */
.hero-grid{display:grid;grid-template-columns:1.25fr .85fr;gap:54px;align-items:start}
.badges{display:flex;gap:10px;flex-wrap:wrap;margin-top:30px}
.badge-pill{border:1px solid var(--line);border-radius:999px;padding:9px 17px;font-size:14px;color:var(--ink);background:var(--surface)}
.badge-pill b{background:var(--grad-soft);-webkit-background-clip:text;background-clip:text;color:transparent;font-weight:700}
.buy{border:1px solid var(--line-2);border-radius:22px;overflow:hidden;background:linear-gradient(160deg,rgba(20,16,32,.9),rgba(12,9,22,.95));box-shadow:0 30px 70px -28px rgba(124,92,255,.5);position:sticky;top:92px}
.buy .top{padding:32px 32px 26px;text-align:center;position:relative;border-bottom:1px solid var(--line)}
.buy .top::before{content:"";position:absolute;inset:0;background:radial-gradient(320px 180px at 50% -30%,rgba(155,109,255,.3),transparent)}
.buy .kk{position:relative;font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--cyan-lt);font-weight:500}
.buy .amt{position:relative;font-family:var(--sans);font-size:clamp(42px,7vw,56px);font-weight:800;letter-spacing:-.03em;line-height:1;margin:12px 0 6px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.buy .amt span{font-size:20px;-webkit-text-fill-color:var(--ink-3);vertical-align:super}
.buy .for{position:relative;color:var(--ink-2);font-size:14.5px}
.buy .for b{color:var(--ink)}
.buy .bd{padding:26px 32px 30px}
.mini{list-style:none;display:grid;gap:11px;margin-bottom:24px}
.mini li{display:flex;gap:11px;font-size:14.5px;color:var(--ink)}
.mini li .ck{color:var(--cyan-lt);flex:none;font-weight:800}
.buy .btn{width:100%;justify-content:center;font-size:16px;padding:16px}
.buy .fine{text-align:center;color:var(--ink-3);font-size:12.5px;margin-top:13px}
@media(max-width:920px){.hero-grid{grid-template-columns:1fr;gap:38px}.buy{position:static}}

/* faq */
.faq{display:grid;gap:13px;margin-top:44px;max-width:820px}
details{border:1px solid var(--line);border-radius:14px;background:var(--surface);overflow:hidden;backdrop-filter:blur(8px)}
details[open]{border-color:var(--line-2)}
summary{padding:21px 24px;cursor:pointer;font-family:var(--sans);font-size:17.5px;font-weight:600;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;letter-spacing:-.01em}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";color:var(--cyan-lt);font-size:23px;transition:transform .3s;flex:none}
details[open] summary::after{transform:rotate(45deg)}
details p{padding:0 24px 22px;color:var(--ink-2);font-size:15px;line-height:1.65}

/* final + footer */
.final{text-align:center;padding:104px 0}
.final h2{margin:0 auto;max-width:22ch}
.final p{color:var(--ink-2);font-size:18px;margin:20px auto 36px;max-width:50ch}
.final .btn{font-size:17px;padding:18px 38px}
footer{border-top:1px solid var(--line);padding:42px 0;color:var(--ink-3);position:relative;z-index:2}
.foot{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;font-size:14px}
.foot a{color:var(--ink-2)}
.foot a:hover{color:var(--cyan-lt)}

/* ============ FX: mesh, marquee, AI studio ============ */
.bg-mesh{position:fixed;inset:0;width:100%;height:100%;z-index:1;pointer-events:none;opacity:.9}

.marquee{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:linear-gradient(90deg,rgba(124,92,255,.12),rgba(54,211,240,.1));color:var(--ink);overflow:hidden;padding:15px 0;backdrop-filter:blur(6px);position:relative;z-index:2}
.marquee-track{display:flex;white-space:nowrap;width:max-content;animation:marq 34s linear infinite}
.marquee-track .m-item{font-family:var(--mono);font-size:14px;letter-spacing:.04em;padding:0 26px;display:inline-flex;align-items:center;gap:26px;opacity:.92}
.marquee-track .m-star{background:var(--grad-soft);-webkit-background-clip:text;background-clip:text;color:transparent}
@keyframes marq{to{transform:translateX(-50%)}}
.marquee:hover .marquee-track{animation-play-state:paused}
@media (prefers-reduced-motion:reduce){.marquee-track{animation:none}}

.ai-studio-sec .lead{margin-bottom:40px}
.builder{border:1px solid var(--line);border-radius:22px;overflow:hidden;position:relative;background:linear-gradient(180deg,rgba(20,16,32,.92),rgba(10,8,18,.96));box-shadow:0 30px 80px -30px rgba(124,92,255,.5)}
.builder::before{content:"";position:absolute;inset:0;border-radius:22px;padding:1px;background:var(--grad);-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;opacity:.5;pointer-events:none}
.builder-head{display:flex;align-items:center;gap:14px;padding:14px 20px;border-bottom:1px solid var(--line);background:rgba(0,0,0,.25)}
.dots{display:flex;gap:7px}
.dots i{width:11px;height:11px;border-radius:50%;background:rgba(255,255,255,.16)}
.dots i:first-child{background:var(--violet)}.dots i:nth-child(2){background:var(--cyan)}
.builder-title{font-family:var(--mono);font-size:13px;color:var(--ink-2)}
.builder-spark{color:var(--violet-lt)}
.builder-live{margin-left:auto;font-family:var(--mono);font-size:12px;color:var(--cyan-lt);display:flex;align-items:center;gap:7px}
.builder-live::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 0 0 var(--glow-c);animation:livedot 1.6s infinite}
@keyframes livedot{0%{box-shadow:0 0 0 0 var(--glow-c)}70%{box-shadow:0 0 0 8px rgba(54,211,240,0)}}
.builder-body{display:grid;grid-template-columns:1fr 1fr;min-height:430px}
@media(max-width:820px){.builder-body{grid-template-columns:1fr;min-height:0}}
.builder-chat{padding:24px;display:flex;flex-direction:column;gap:14px;border-right:1px solid var(--line);overflow-y:auto;max-height:430px}
@media(max-width:820px){.builder-chat{border-right:0;border-bottom:1px solid var(--line);min-height:280px;max-height:340px}}
.bubble{max-width:90%;padding:12px 15px;border-radius:14px;font-size:14.5px;line-height:1.45;animation:bubbleIn .4s var(--ease) both}
@keyframes bubbleIn{from{opacity:0;transform:translateY(8px)}}
.bubble.user{align-self:flex-end;background:var(--grad-soft);color:#fff;border-bottom-right-radius:5px;box-shadow:0 8px 24px -10px var(--glow-v)}
.bubble.ai{align-self:flex-start;background:rgba(255,255,255,.05);border:1px solid var(--line);border-bottom-left-radius:5px;color:var(--ink)}
.bubble .who{font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;opacity:.8;display:block;margin-bottom:5px}
.bubble.ai .who{color:var(--cyan-lt);opacity:1}
.bubble .step{display:flex;align-items:center;gap:9px;margin:4px 0;opacity:.5;transition:opacity .3s}
.bubble .step.done{opacity:1}
.bubble .step .sx{width:16px;height:16px;border-radius:50%;border:1.5px solid rgba(255,255,255,.25);display:inline-grid;place-items:center;font-size:10px;flex-shrink:0}
.bubble .step.done .sx{background:var(--cyan);border-color:var(--cyan);color:#04222b}
.typing-ind{display:inline-flex;gap:4px;align-items:center}
.typing-ind i{width:6px;height:6px;border-radius:50%;background:var(--violet-lt);animation:td 1.2s infinite}
.typing-ind i:nth-child(2){animation-delay:.2s}.typing-ind i:nth-child(3){animation-delay:.4s}
@keyframes td{0%,60%,100%{transform:translateY(0);opacity:.4}30%{transform:translateY(-5px);opacity:1}}
.builder-preview{background:#07060d;display:flex;flex-direction:column}
.preview-bar{display:flex;align-items:center;gap:8px;padding:11px 16px;border-bottom:1px solid var(--line)}
.preview-bar>span:first-child{width:8px;height:8px;border-radius:50%;background:rgba(255,255,255,.2)}
.preview-url{font-family:var(--mono);font-size:12px;color:var(--ink-3);background:rgba(255,255,255,.05);padding:4px 12px;border-radius:6px;flex:1}
.preview-stage{flex:1;padding:20px;display:flex;flex-direction:column;gap:12px;position:relative;min-height:340px;justify-content:center}
.preview-empty{position:absolute;inset:0;display:grid;place-items:center;font-family:var(--mono);font-size:13px;color:var(--ink-3)}
.pblock{background:rgba(255,255,255,.05);border:1px solid var(--line);border-radius:10px;opacity:0;transform:translateY(14px) scale(.98);animation:blockIn .5s var(--ease) forwards}
@keyframes blockIn{to{opacity:1;transform:none}}
.pblock.bar{height:38px;display:flex;align-items:center;padding:0 14px;gap:10px}
.pblock.bar .pb-logo{width:22px;height:22px;border-radius:7px;background:var(--grad-soft)}
.pblock.bar .pb-line{height:7px;border-radius:4px;background:rgba(255,255,255,.16)}
.pblock.hero-b{padding:18px;display:flex;flex-direction:column;gap:10px}
.pblock.hero-b .pb-h{height:16px;width:70%;border-radius:5px;background:linear-gradient(90deg,var(--violet-lt),var(--cyan-lt))}
.pblock.hero-b .pb-h2{height:10px;width:90%;border-radius:5px;background:rgba(255,255,255,.14)}
.pblock.grid-b{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;background:transparent;border:0}
.pblock.grid-b .pb-cell{height:48px;border-radius:8px;background:rgba(255,255,255,.06);border:1px solid var(--line)}
.pblock.cta-b{height:40px;background:var(--grad-soft);border:0;display:grid;place-items:center;color:#fff;font-size:13px;font-weight:700;border-radius:9px;box-shadow:0 6px 20px -8px var(--glow-v)}
.pblock.field-b{height:34px}
.preview-done{position:absolute;top:14px;right:14px;font-family:var(--mono);font-size:11px;color:var(--cyan-lt);display:flex;align-items:center;gap:6px;opacity:0;transition:opacity .4s}
.preview-done.show{opacity:1}
.preview-done .pd-check{width:15px;height:15px;border-radius:50%;background:var(--cyan);color:#04222b;display:grid;place-items:center;font-size:9px}