/* Bio Teach — платформа прототипі
   Палитра и шрифты — дизайн-система Bio-Teach (course/design-system/):
   night #0e2a47 · coral #e6746c · blue #97bce9 · paper-blue #dee8fa · cream #f5edde
   Kumbh Sans (заголовки) + Albert Sans (текст).
   Эффекты (aurora, particles, spotlight, tracing beam, text generate, ticker,
   border beam, shimmer, confetti) — по мотивам Aceternity UI / Magic UI / uiverse,
   реализованы на чистом CSS + fx.js без React. */

:root{
  --night:#0e2a47;
  --night-2:#143a63;
  --night-3:#1d4f85;
  --ink:#1d1d1d;
  --ink-soft:#333333;
  --mute:#545c68;
  --mute-2:#98a2b0;
  --paper:#f7f8fb;
  --surface:#ffffff;
  --blue-soft:#dee8fa;
  --blue-100:#eaf2fb;
  --blue:#97bce9;
  --blue-700:#5b8ec4;
  --blue-900:#325b86;
  --cream:#f5edde;
  --sand:#e0cebf;
  --accent:#e6746c;
  --accent-deep:#b64242;
  --accent-100:#fceceb;
  --accent-300:#f2aca7;
  --line:#e2e7ee;
  --line-strong:#c9d2dd;
  --ok:#2f8f6b;
  --ok-soft:#dff3ea;
  --font-h:'Kumbh Sans','Helvetica Neue',Arial,sans-serif;
  --font-b:'Albert Sans','Helvetica Neue',Arial,sans-serif;
  --shadow-sm:0 1px 2px rgba(14,42,71,.06);
  --shadow-md:0 4px 14px -2px rgba(14,42,71,.10), 0 2px 6px -2px rgba(14,42,71,.06);
  --shadow-lg:0 18px 44px -14px rgba(14,42,71,.28);
  --ease-out:cubic-bezier(.22,1,.36,1);
  --ease-spring:cubic-bezier(.34,1.56,.64,1);
  --r-sm:8px; --r-md:14px; --r-lg:20px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;}
html,body{background:var(--paper); margin:0;}
input,textarea,select{color:var(--ink); caret-color:var(--ink);}
body{
  color:var(--ink);
  font-family:var(--font-b);
  font-size:15.5px;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4,.display{font-family:var(--font-h); font-weight:700; letter-spacing:-0.015em; line-height:1.15;}
p{max-width:60ch}
a{color:inherit}
::selection{background:var(--blue-soft); color:var(--night);}
.num,.tabular{font-variant-numeric:tabular-nums;}
img,svg{max-width:100%;}
button{font-family:inherit;}

@media (prefers-reduced-motion: reduce){
  *{animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important; scroll-behavior:auto !important;}
  [data-reveal]{opacity:1 !important; transform:none !important;}
  .tg-w{opacity:1 !important; filter:none !important; transform:none !important;}
}

[hidden]{display:none !important;}
.view{display:none;}
.view.is-active{display:block;}

/* ===================================================================
   AUTH STAGE — split-screen: тёмная сцена (aurora + particles) + карточка
   =================================================================== */
.auth-stage{
  min-height:100vh; min-height:100dvh;
  display:grid; grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);
  background:var(--night); color:#fff;
}
.auth-hero{
  position:relative; overflow:hidden; isolation:isolate;
  padding:56px 56px 48px; display:flex; flex-direction:column; justify-content:space-between;
  background:var(--night);
}
.aurora{position:absolute; inset:-20%; z-index:-2; filter:blur(60px) saturate(1.2); opacity:.85; pointer-events:none;}
.aurora span{position:absolute; border-radius:50%; mix-blend-mode:screen; will-change:transform;}
.aurora .a1{width:60%; height:60%; left:-10%; top:-10%; background:radial-gradient(circle at 30% 30%, rgba(151,188,233,.85), transparent 60%); animation:aur1 18s ease-in-out infinite alternate;}
.aurora .a2{width:55%; height:55%; right:-10%; top:10%; background:radial-gradient(circle at 60% 40%, rgba(230,116,108,.75), transparent 60%); animation:aur2 22s ease-in-out infinite alternate;}
.aurora .a3{width:70%; height:50%; left:15%; bottom:-20%; background:radial-gradient(circle at 50% 50%, rgba(91,142,196,.7), transparent 60%); animation:aur3 26s ease-in-out infinite alternate;}
@keyframes aur1{from{transform:translate(0,0) scale(1);} to{transform:translate(18%,12%) scale(1.15);}}
@keyframes aur2{from{transform:translate(0,0) scale(1.05);} to{transform:translate(-16%,18%) scale(.9);}}
@keyframes aur3{from{transform:translate(0,0) scale(1);} to{transform:translate(-10%,-14%) scale(1.2);}}
.particles{position:absolute; inset:0; z-index:-1; width:100%; height:100%; pointer-events:none;}
.hero-grid{
  position:absolute; inset:0; z-index:-1; pointer-events:none; opacity:.35;
  background-image:linear-gradient(rgba(255,255,255,.06) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.06) 1px, transparent 1px);
  background-size:44px 44px;
  -webkit-mask-image:radial-gradient(ellipse 70% 70% at 50% 40%, #000 30%, transparent 75%);
  mask-image:radial-gradient(ellipse 70% 70% at 50% 40%, #000 30%, transparent 75%);
}
.hero-brand{display:flex; align-items:center; gap:12px; font-family:var(--font-h); font-weight:700; font-size:19px; letter-spacing:-.01em;}
.hero-brand svg{width:40px; height:40px; filter:drop-shadow(0 6px 14px rgba(0,0,0,.35));}
.hero-brand small{display:block; font-family:var(--font-b); font-weight:400; font-size:11.5px; opacity:.7; letter-spacing:.02em; margin-top:2px;}
.hero-body{margin:auto 0; padding:48px 0;}
.hero-eyebrow{
  display:inline-flex; align-items:center; gap:8px; font-size:12px; font-weight:600; letter-spacing:.08em; text-transform:uppercase;
  color:var(--blue); background:rgba(151,188,233,.12); border:1px solid rgba(151,188,233,.3); padding:6px 12px; border-radius:30px;
}
.hero-eyebrow i{width:6px; height:6px; border-radius:50%; background:var(--accent); box-shadow:0 0 0 0 rgba(230,116,108,.6); animation:ping 2.2s ease-out infinite;}
@keyframes ping{0%{box-shadow:0 0 0 0 rgba(230,116,108,.6);} 100%{box-shadow:0 0 0 10px rgba(230,116,108,0);}}
.hero-title{font-size:clamp(30px,3.6vw,50px); margin:20px 0 14px; max-width:14ch; text-wrap:balance; line-height:1.05;}
.hero-title .hl{
  background:linear-gradient(90deg, var(--accent-300), var(--accent), var(--blue), var(--accent-300));
  background-size:300% 100%; -webkit-background-clip:text; background-clip:text; color:transparent;
  animation:gradient-x 6s linear infinite;
}
@keyframes gradient-x{to{background-position:300% 0;}}
.hero-sub{font-size:16px; line-height:1.6; opacity:.82; max-width:46ch; margin:0 0 30px;}
.rotator{display:inline-grid; vertical-align:bottom; text-align:left; height:1.3em; overflow:hidden;}
.rotator span{grid-area:1/1; font-weight:600; color:var(--blue); transform:translateY(110%); opacity:0; transition:transform .55s var(--ease-out), opacity .4s;}
.rotator span.is-in{transform:translateY(0); opacity:1;}
.rotator span.is-out{transform:translateY(-110%); opacity:0;}
.hero-stats{display:flex; gap:28px; flex-wrap:wrap;}
.stat{display:flex; flex-direction:column; gap:2px; min-width:96px;}
.stat b{font-family:var(--font-h); font-size:34px; font-weight:700; line-height:1; color:#fff; font-variant-numeric:tabular-nums;}
.stat b em{font-style:normal; color:var(--accent);}
.stat > span{font-size:12.5px; opacity:.7;}
.hero-foot{font-size:12px; opacity:.55; display:flex; gap:14px; flex-wrap:wrap;}
.marquee{
  --gap:18px; position:relative; display:flex; overflow:hidden; gap:var(--gap); user-select:none; margin-top:22px;
  -webkit-mask-image:linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  mask-image:linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
}
.marquee ul{list-style:none; margin:0; padding:0; display:flex; gap:var(--gap); flex-shrink:0; min-width:100%; justify-content:space-around; animation:marquee 40s linear infinite;}
.marquee li{white-space:nowrap; font-size:12.5px; padding:6px 12px; border-radius:20px; background:rgba(255,255,255,.06); border:1px solid rgba(255,255,255,.1); color:rgba(255,255,255,.8);}
.marquee:hover ul{animation-play-state:paused;}
@keyframes marquee{to{transform:translateX(calc(-100% - var(--gap)));}}

.auth-slot{
  display:flex; align-items:center; justify-content:center; padding:40px 24px;
  background:var(--paper); color:var(--ink); position:relative;
}
.auth-slot::before{
  content:""; position:absolute; inset:0; pointer-events:none; opacity:.5;
  background-image:radial-gradient(circle, var(--line-strong) 1px, transparent 1.4px); background-size:22px 22px;
  -webkit-mask-image:radial-gradient(ellipse 80% 80% at 50% 50%, #000, transparent 80%);
  mask-image:radial-gradient(ellipse 80% 80% at 50% 50%, #000, transparent 80%);
}
.auth-card{
  position:relative; width:100%; max-width:420px; background:var(--surface); border:1px solid var(--line);
  border-radius:var(--r-lg); padding:34px 32px; box-shadow:var(--shadow-lg);
  animation:card-in .6s var(--ease-out) both;
}
@keyframes card-in{from{opacity:0; transform:translateY(18px) scale(.98);} to{opacity:1; transform:none;}}
.auth-card.wide{max-width:640px;}
.auth-logo{display:flex; align-items:center; gap:10px; margin-bottom:22px;}
.auth-logo svg{width:34px; height:34px;}
.auth-logo b{font-family:var(--font-h); font-weight:700; font-size:17px;}
.auth-card h1{font-size:24px; margin:0 0 6px;}
.auth-card > p.lead{color:var(--mute); font-size:14px; margin:0 0 22px;}

/* Border Beam (Magic UI): бегущий блик по рамке карточки */
.beam{position:relative;}
.beam::before{
  content:""; position:absolute; inset:-1px; border-radius:inherit; padding:1.5px; pointer-events:none;
  background:conic-gradient(from var(--beam-angle,0deg), transparent 0 70%, var(--blue) 82%, var(--accent) 92%, transparent 100%);
  -webkit-mask:linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite:xor; mask-composite:exclude;
  animation:beam-spin 6s linear infinite;
}
@property --beam-angle{syntax:'<angle>'; inherits:false; initial-value:0deg;}
@keyframes beam-spin{to{--beam-angle:360deg;}}

/* Поля — float-label (uiverse) */
.field{margin-bottom:14px; display:flex; flex-direction:column; gap:6px;}
.field label{font-size:12.5px; font-weight:600; color:var(--ink-soft);}
.field input,.field select{
  border:1.5px solid var(--line); border-radius:var(--r-sm); padding:11px 13px; font:inherit; font-size:14.5px;
  background:var(--paper); color:var(--ink); width:100%;
  transition:border-color .2s, box-shadow .2s, background .2s, transform .2s;
}
.field input:hover,.field select:hover{border-color:var(--line-strong);}
.field input:focus,.field select:focus{outline:none; border-color:var(--blue-700); background:var(--surface); box-shadow:0 0 0 4px var(--blue-100);}
.field-error{font-size:12px; color:var(--accent-deep); display:none;}
.field-hint{font-size:12px; color:var(--mute);}
.field input[readonly]{background:var(--blue-100); color:var(--mute); cursor:default;}
.profile-card{background:var(--surface,#fff); border:1px solid var(--line); border-radius:var(--r-md); padding:20px 22px; max-width:560px;}
.profile-card .auth-actions{display:flex; align-items:center; gap:12px; flex-wrap:wrap;}
.profile-card .inline-msg{margin:0;}
.field.has-error input,.field.has-error select{border-color:var(--accent); animation:shake .4s var(--ease-out);}
.field.has-error .field-error{display:block;}
@keyframes shake{10%,90%{transform:translateX(-1px);} 20%,80%{transform:translateX(2px);} 30%,50%,70%{transform:translateX(-4px);} 40%,60%{transform:translateX(4px);}}
.field-hint{font-size:11.5px; color:var(--mute); margin-top:2px;}
.two-col{display:grid; grid-template-columns:1fr 1fr; gap:12px;}
.auth-actions{margin-top:20px;}
.auth-foot{margin-top:16px; text-align:center; font-size:13px; color:var(--mute);}
.link-btn{color:var(--night); font-weight:600; cursor:pointer; background:none; border:none; font:inherit; padding:0; text-decoration:underline; text-underline-offset:3px; text-decoration-color:var(--blue);}
.link-btn:hover{text-decoration-color:var(--accent);}
.auth-note{margin-top:20px; font-size:11.5px; color:var(--mute); background:var(--blue-100); border:1px solid var(--blue-soft); border-radius:var(--r-sm); padding:10px 12px; line-height:1.5;}
.auth-note code{font-size:11px; background:rgba(14,42,71,.06); padding:1px 5px; border-radius:4px;}
.inline-msg{font-size:12px; color:var(--night); margin-top:8px; display:none;}
.inline-msg.show{display:block;}

.consent-text{max-height:260px; overflow-y:auto; border:1px solid var(--line); border-radius:var(--r-md); padding:6px 18px; background:var(--paper); font-size:13.5px; line-height:1.6; margin-bottom:18px;}
.consent-text h4{margin:14px 0 6px; font-size:14px; color:var(--night);}
.consent-text p{margin:0 0 10px; max-width:none;}
.consent-check{display:flex; align-items:flex-start; gap:12px; font-size:13.5px; margin-bottom:18px; max-width:none; cursor:pointer;}
.consent-check input{position:absolute; opacity:0; width:0; height:0;}
.consent-check .sw{position:relative; flex-shrink:0; width:42px; height:24px; border-radius:24px; background:var(--line-strong); transition:background .25s; margin-top:1px;}
.consent-check .sw::after{content:""; position:absolute; top:3px; left:3px; width:18px; height:18px; border-radius:50%; background:#fff; box-shadow:0 1px 3px rgba(0,0,0,.25); transition:transform .3s var(--ease-spring);}
.consent-check input:checked + .sw{background:var(--ok);}
.consent-check input:checked + .sw::after{transform:translateX(18px);}
.consent-check input:focus-visible + .sw{outline:2px solid var(--night); outline-offset:2px;}
.consent-actions{display:flex; gap:10px; flex-wrap:wrap;}

/* ===================================================================
   BUTTONS
   =================================================================== */
.btn{
  position:relative; overflow:hidden;
  display:inline-flex; align-items:center; justify-content:center; gap:6px;
  font-family:var(--font-b); font-weight:600; font-size:14px;
  padding:11px 20px; border-radius:var(--r-md); border:none; cursor:pointer; text-decoration:none;
  transition:transform .2s var(--ease-spring), box-shadow .2s, background .2s, color .2s;
  -webkit-tap-highlight-color:transparent;
}
.btn:hover{transform:translateY(-2px);}
.btn:active{transform:translateY(0) scale(.97);}
.btn:focus-visible{outline:2px solid var(--night); outline-offset:2px;}
.btn-primary{background:var(--night); color:#fff; box-shadow:0 6px 18px -8px rgba(14,42,71,.7);}
.btn-primary:hover{background:var(--night-2); box-shadow:0 10px 24px -8px rgba(14,42,71,.75);}
.btn-primary::after{ /* Shimmer Button (Magic UI) */
  content:""; position:absolute; top:0; left:-150%; width:60%; height:100%; pointer-events:none;
  background:linear-gradient(105deg, transparent 20%, rgba(255,255,255,.28) 50%, transparent 80%);
  transform:skewX(-20deg); animation:shimmer 3.2s ease-in-out infinite;
}
@keyframes shimmer{0%{left:-150%;} 55%,100%{left:180%;}}
.btn-ghost{background:var(--blue-soft); color:var(--night);}
.btn-ghost:hover{background:var(--blue-100); box-shadow:0 6px 16px -8px rgba(14,42,71,.4);}
.btn-accent{background:var(--accent-deep); color:#fff;}
.btn-accent:hover{background:var(--accent);}
.btn-block{width:100%;}
.btn[disabled]{opacity:.5; cursor:not-allowed; transform:none !important;}
.btn .ripple{position:absolute; border-radius:50%; background:rgba(255,255,255,.35); transform:scale(0); animation:ripple .6s ease-out forwards; pointer-events:none;}
.btn-ghost .ripple{background:rgba(14,42,71,.15);}
@keyframes ripple{to{transform:scale(4); opacity:0;}}

/* ===================================================================
   APP CHROME
   =================================================================== */
.app{max-width:1240px; margin:0 auto; padding:0 24px;}

header.top{
  position:sticky; top:0; z-index:55;
  background:rgba(247,248,251,.82);
  backdrop-filter:blur(12px) saturate(1.4); -webkit-backdrop-filter:blur(12px) saturate(1.4);
  border-bottom:1px solid var(--line);
}
header.top .row{max-width:1240px; margin:0 auto; padding:12px 24px; display:flex; align-items:center; gap:16px; position:relative;}
.wordmark{display:flex; align-items:center; gap:10px; flex-shrink:0; background:none; border:none; padding:0; cursor:pointer; font:inherit; color:inherit; border-radius:10px;}
.wordmark svg{width:34px; height:34px; transition:transform .5s var(--ease-spring);}
.wordmark:hover svg{transform:rotate(-12deg) scale(1.06);}
.wordmark .name{font-family:var(--font-h); font-weight:700; font-size:17px; color:var(--night); line-height:1; display:block;}
.wordmark .tagline{font-size:10.5px; color:var(--mute); display:block; margin-top:3px; letter-spacing:.02em;}
.spacer{flex:1;}
.head-progress{display:flex; align-items:center; gap:10px; font-size:12.5px; color:var(--mute); font-weight:500;}
.head-progress .track{display:block; width:120px; height:6px; border-radius:6px; background:var(--line); overflow:hidden;}
.head-progress .fill{display:block; height:100%; width:0; border-radius:6px; background:linear-gradient(90deg, var(--night-3), var(--blue-700)); transition:width 1.2s var(--ease-out);}
.avatar-btn{border:none; background:none; cursor:pointer; padding:0; border-radius:50%;}
.avatar{
  width:38px; height:38px; border-radius:50%; background:linear-gradient(135deg, var(--night), var(--night-3)); color:#fff;
  display:flex; align-items:center; justify-content:center; font-family:var(--font-h); font-weight:700; font-size:13px;
  box-shadow:0 0 0 2px var(--surface), 0 0 0 3.5px var(--blue); transition:transform .25s var(--ease-spring);
}
.avatar-btn:hover .avatar{transform:scale(1.06);}
.avatar-btn:focus-visible .avatar,.wordmark:focus-visible{outline:2px solid var(--night); outline-offset:2px;}
.user-menu{
  position:absolute; top:58px; right:24px; background:var(--surface); border:1px solid var(--line);
  border-radius:var(--r-md); box-shadow:var(--shadow-lg); min-width:200px; padding:8px; z-index:60;
  transform-origin:top right; animation:pop-in .22s var(--ease-spring) both;
}
@keyframes pop-in{from{opacity:0; transform:scale(.92) translateY(-6px);} to{opacity:1; transform:none;}}
.user-menu .um-name{padding:9px 12px 10px; font-weight:600; font-size:13px; border-bottom:1px solid var(--line); margin-bottom:4px; color:var(--ink);}
.user-menu .um-name span{display:block; font-weight:400; font-size:11.5px; color:var(--mute); margin-top:2px;}
.user-menu button,.user-menu a{box-sizing:border-box; text-decoration:none; display:block; width:100%; text-align:left; background:none; border:none; padding:9px 12px; border-radius:9px; font:inherit; font-size:13.5px; cursor:pointer; color:var(--ink); transition:background .15s;}
.user-menu button:hover,.user-menu a:hover{background:var(--blue-100);}

/* ===================================================================
   LAYOUT / DASHBOARD
   =================================================================== */
.layout{display:grid; grid-template-columns:224px minmax(0,1fr) 288px; gap:28px; padding:28px 0 80px;}
.rail-left{position:sticky; top:84px; align-self:start;}
.rail-left h3{font-size:11px; text-transform:uppercase; letter-spacing:.08em; color:var(--mute); font-weight:600; margin:0 0 10px 4px;}
.unit-list{list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:2px; position:relative;}
.unit-list .slider{position:absolute; left:0; width:100%; height:0; border-radius:10px; background:var(--blue-soft); transition:top .35s var(--ease-out), height .35s var(--ease-out); z-index:0; pointer-events:none;}
.unit-list li{position:relative; z-index:1;}
.unit-list li button{
  display:flex; align-items:center; gap:10px; padding:8px 10px; border-radius:10px; font-size:13.3px; color:var(--ink-soft);
  width:100%; text-align:left; background:none; border:none; font:inherit; cursor:pointer; transition:color .2s, transform .2s var(--ease-out);
}
.unit-list li button:hover{transform:translateX(3px); color:var(--night);}
.unit-list li button .dot{width:7px; height:7px; border-radius:50%; background:var(--line-strong); flex-shrink:0; transition:background .2s, box-shadow .2s;}
.unit-list li .done .dot{background:var(--blue-700);}
.unit-list li .current{color:var(--night); font-weight:600;}
.unit-list li .current .dot{background:var(--accent); box-shadow:0 0 0 3px var(--accent-100);}

.rail-right{position:sticky; top:84px; align-self:start; display:flex; flex-direction:column; gap:16px;}

/* Magic Card: spotlight за курсором */
.card{
  position:relative; overflow:hidden;
  background:var(--surface); border:1px solid var(--line); border-radius:var(--r-lg);
  padding:20px 22px; box-shadow:var(--shadow-sm);
  transition:transform .3s var(--ease-out), box-shadow .3s, border-color .3s;
}
.card::before{
  content:""; position:absolute; inset:0; pointer-events:none; opacity:0; transition:opacity .35s;
  background:radial-gradient(360px circle at var(--mx,50%) var(--my,50%), rgba(151,188,233,.28), transparent 45%);
}
.card:hover{transform:translateY(-3px); box-shadow:var(--shadow-md); border-color:var(--blue);}
.card:hover::before{opacity:1;}
.card > *{position:relative;}
.card h4{margin:0 0 4px; font-size:15px; color:var(--night);}
.card p.sub{color:var(--mute); font-size:12.8px; margin:0 0 14px;}
.card--hero{background:linear-gradient(145deg, var(--night) 0%, var(--night-2) 60%, var(--night-3) 100%); color:#fff; border-color:transparent;}
.card--hero h4{color:#fff;}
.card--hero p.sub{color:rgba(255,255,255,.72);}
.card--hero::before{background:radial-gradient(320px circle at var(--mx,50%) var(--my,50%), rgba(255,255,255,.16), transparent 45%);}
.card--hero .btn-primary{background:var(--accent-deep); box-shadow:0 8px 20px -8px rgba(182,66,66,.8);}
.card--hero .btn-primary:hover{background:var(--accent);}
.card--hero .ring-wrap{display:flex; align-items:center; gap:14px; margin-bottom:14px;}
.ring{width:64px; height:64px; flex-shrink:0; transform:rotate(-90deg);}
.ring circle{fill:none; stroke-width:6; stroke-linecap:round;}
.ring .bg{stroke:rgba(255,255,255,.15);}
.ring .fg{stroke:var(--blue); stroke-dasharray:1; stroke-dashoffset:1; transition:stroke-dashoffset 1.4s var(--ease-out);}
.ring-txt b{display:block; font-family:var(--font-h); font-size:24px; line-height:1;}
.ring-txt span{font-size:12px; opacity:.72;}

.ck-pk-tk{display:flex; flex-direction:column; gap:12px;}
.bar-row{display:flex; align-items:center; gap:10px;}
.bar-row .label{width:30px; font-family:var(--font-h); font-weight:700; font-size:11.5px; color:var(--mute);}
.bar-track{display:block; flex:1; height:8px; background:var(--line); border-radius:6px; overflow:hidden;}
.bar-fill{display:block; height:100%; border-radius:6px; width:0; transition:width 1.3s var(--ease-out);}
.bar-fill.b-ck{background:linear-gradient(90deg, var(--night-3), var(--blue-700));}
.bar-fill.b-pk{background:linear-gradient(90deg, var(--accent-deep), var(--accent));}
.bar-fill.b-tk{background:linear-gradient(90deg, var(--blue-700), var(--blue));}
.bar-row .pct{width:36px; text-align:right; font-size:12px; color:var(--mute); font-weight:600;}

.roadmap-head{padding:6px 0 22px;}
.eyebrow{
  display:inline-flex; align-items:center; gap:7px; font-size:11.5px; font-weight:600; letter-spacing:.07em; color:var(--night);
  background:var(--blue-soft); padding:5px 11px; border-radius:20px; margin-bottom:12px;
}
.eyebrow::before{content:""; width:6px; height:6px; border-radius:50%; background:var(--accent);}
.roadmap-head h1{font-size:clamp(26px,3vw,36px); margin:0 0 8px; text-wrap:balance; color:var(--night);}
.roadmap-head p{color:var(--mute); font-size:14.5px; margin:0; max-width:64ch;}

/* Text Generate Effect */
.tg-w{display:inline-block; opacity:0; filter:blur(6px); transform:translateY(6px); transition:opacity .5s var(--ease-out), filter .5s, transform .5s var(--ease-out);}
.tg-w.in{opacity:1; filter:blur(0); transform:none;}

.node-detail{
  position:relative; background:var(--surface); border:1px solid var(--line); border-radius:var(--r-lg);
  padding:22px 24px; margin-bottom:22px; box-shadow:var(--shadow-md);
  animation:nd-in .35s var(--ease-out); overflow:hidden;
}
.node-detail::after{content:""; position:absolute; left:0; top:0; bottom:0; width:4px; background:linear-gradient(var(--accent), var(--blue));}
@keyframes nd-in{from{opacity:0; transform:translateY(-8px) scale(.99);} to{opacity:1; transform:none;}}
.node-detail .nd-week{font-size:11px; font-weight:600; letter-spacing:.06em; color:var(--accent-deep); text-transform:uppercase;}
.node-detail h3{font-size:18px; margin:4px 0 8px; color:var(--night);}
.node-detail p{color:var(--mute); font-size:13.5px; margin:0 0 14px; max-width:56ch;}
.nd-close{
  position:absolute; top:14px; right:14px; width:30px; height:30px; border-radius:50%;
  border:1px solid var(--line); background:var(--paper); color:var(--mute); cursor:pointer;
  display:flex; align-items:center; justify-content:center; transition:transform .3s var(--ease-spring), background .2s;
}
.nd-close:hover{background:var(--blue-soft); transform:rotate(90deg);}
.node-item.is-flash .node-shape{animation:flash-ring 1s ease-out;}
@keyframes flash-ring{0%{box-shadow:0 0 0 0 var(--accent);} 60%{box-shadow:0 0 0 14px transparent;} 100%{box-shadow:0 0 0 0 transparent;}}

/* Roadmap + Tracing Beam */
.roadmap-wrap{position:relative;}
.roadmap-wrap svg.path{position:absolute; top:0; left:0; width:100%; height:100%; z-index:0; overflow:visible;}
.roadmap-wrap svg.path .trail{stroke:var(--line-strong); stroke-dasharray:1 13;}
.roadmap-wrap svg.path .beam-line{stroke:url(#beamGrad); stroke-width:4; filter:drop-shadow(0 0 6px rgba(151,188,233,.7));}
.roadmap-wrap svg.path .beam-head{fill:var(--accent); filter:drop-shadow(0 0 8px rgba(230,116,108,.9)); opacity:0;}
.node-list{list-style:none; margin:0; padding:0; position:relative; z-index:1;}
.node-item{position:relative; height:132px;}
.node-item .hit{
  position:absolute; top:50%; transform:translateY(-50%);
  display:flex; align-items:center; gap:16px; text-decoration:none; color:inherit;
  cursor:pointer; background:none; border:none; padding:8px; margin:-8px; text-align:left;
  font:inherit; border-radius:18px; -webkit-tap-highlight-color:transparent; transition:background .2s;
}
.node-item .hit:hover{background:rgba(255,255,255,.7);}
.node-item .hit:focus-visible{outline:2px solid var(--night); outline-offset:2px;}
.node-item.is-selected .node-shape{outline:3px solid var(--night); outline-offset:4px;}
.node-item.is-selected .node-title{text-decoration:underline; text-decoration-color:var(--blue); text-underline-offset:3px;}
.node-item.x0 .hit{left:24px;}
.node-item.x1 .hit{left:calc(50% - 32px);}
.node-item.x2 .hit{left:calc(100% - 270px);}
.node-item[data-reveal]{opacity:0; transform:translateY(20px); transition:opacity .6s var(--ease-out), transform .6s var(--ease-out);}
.node-item[data-reveal].in{opacity:1; transform:none;}

.node-shape{
  width:64px; height:64px; flex-shrink:0; display:flex; align-items:center; justify-content:center;
  position:relative; font-family:var(--font-h); font-weight:700; font-size:16px;
  transition:transform .3s var(--ease-spring), box-shadow .3s;
}
.node-item .hit:hover .node-shape{transform:scale(1.08) rotate(-3deg);}
.shape-circle{border-radius:50%;}
.state-done .node-shape{background:linear-gradient(135deg, var(--night-3), var(--night)); color:#fff; box-shadow:0 8px 18px -8px rgba(14,42,71,.7);}
.state-done .node-shape svg path{stroke-dasharray:30; stroke-dashoffset:30; animation:draw .7s var(--ease-out) .3s forwards;}
@keyframes draw{to{stroke-dashoffset:0;}}
.state-current .node-shape{background:var(--surface); color:var(--accent-deep); border:3px solid var(--accent); box-shadow:0 0 0 6px var(--accent-100), 0 10px 22px -10px rgba(230,116,108,.7);}
.state-locked .node-shape{background:var(--surface); color:var(--mute-2); border:2px dashed var(--line-strong);}
.state-ready .node-shape{background:var(--surface); color:var(--night); border:2px solid var(--blue-700);}
.state-current .node-shape::after{
  content:""; position:absolute; inset:-9px; border-radius:inherit; border:2px solid var(--accent);
  opacity:.55; animation:pulse 2.4s ease-out infinite;
}
@keyframes pulse{0%{transform:scale(.94); opacity:.6;} 70%{transform:scale(1.25); opacity:0;} 100%{opacity:0;}}
.node-copy{max-width:280px;}
.node-week{font-size:11px; font-weight:600; letter-spacing:.06em; color:var(--mute); text-transform:uppercase;}
.node-title{font-family:var(--font-h); font-weight:600; font-size:15px; color:var(--night); margin-top:2px; line-height:1.28;}
.state-locked .node-title{color:var(--mute);}
.node-meta{font-size:12px; color:var(--mute); margin-top:5px; display:flex; gap:8px; align-items:center; flex-wrap:wrap;}
.badge{font-size:10.5px; font-weight:600; padding:3px 9px; border-radius:20px; letter-spacing:.01em;}
.badge-done{background:var(--blue-soft); color:var(--night);}
.badge-current{background:var(--accent-100); color:var(--accent-deep);}
.badge-check{background:var(--cream); color:#7a5a2a;}
.badge-locked{background:var(--paper); color:var(--mute); border:1px solid var(--line);}
.badge-capstone{background:var(--accent-100); color:var(--accent-deep);}
.bubble{fill:var(--blue-soft); opacity:0; animation:float 3.6s ease-in-out infinite;}
@keyframes float{0%{opacity:0; transform:translateY(0);} 15%{opacity:1;} 85%{opacity:1;} 100%{opacity:0; transform:translateY(-14px);}}

/* legend */
.legend-section{margin-top:64px; padding-top:36px; border-top:1px solid var(--line);}
.legend-section h2{font-size:20px; margin:0 0 4px; color:var(--night);}
.legend-section > p{color:var(--mute); font-size:13.5px; margin:0 0 22px;}
.legend-grid{display:grid; grid-template-columns:repeat(auto-fit,minmax(210px,1fr)); gap:14px;}
.legend-item{display:flex; align-items:center; gap:12px; background:var(--surface); border:1px solid var(--line); border-radius:var(--r-md); padding:12px 14px; transition:transform .25s var(--ease-out), box-shadow .25s;}
.legend-item:hover{transform:translateY(-2px); box-shadow:var(--shadow-md);}
.legend-item .node-shape{width:40px; height:40px; font-size:12px;}
.legend-item .txt b{display:block; font-size:13px; color:var(--night);}
.legend-item .txt span{font-size:11.5px; color:var(--mute);}
.chip-row{display:flex; gap:10px; flex-wrap:wrap; margin-top:18px; align-items:center;}
.chip{border:1px solid var(--line); background:var(--surface); border-radius:20px; padding:6px 14px; font-size:12.6px; font-weight:600; color:var(--ink-soft);}
footer.note{max-width:1240px; margin:0 auto; padding:0 24px 40px; color:var(--mute); font-size:12px;}

/* reveal on scroll */
[data-reveal]{opacity:0; transform:translateY(18px); transition:opacity .7s var(--ease-out), transform .7s var(--ease-out);}
[data-reveal].in{opacity:1; transform:none;}
.stagger > *{opacity:0; transform:translateY(14px); animation:rise .6s var(--ease-out) forwards; animation-delay:calc(var(--i,0) * 70ms);}
@keyframes rise{to{opacity:1; transform:none;}}

/* ===================================================================
   TUTOR
   =================================================================== */
.tutor-fab{
  position:fixed; right:24px; bottom:24px; z-index:50;
  display:flex; align-items:center; gap:10px;
  background:var(--night); color:#fff; border:none; border-radius:30px;
  padding:10px 18px 10px 10px; cursor:pointer; box-shadow:var(--shadow-lg);
  font-family:var(--font-b); font-weight:600; font-size:13.5px;
  transition:transform .25s var(--ease-spring), box-shadow .25s;
}
.tutor-fab:hover{transform:translateY(-3px) scale(1.02); box-shadow:0 22px 40px -14px rgba(14,42,71,.6);}
.tutor-fab::before{content:""; position:absolute; inset:0; border-radius:inherit; border:2px solid var(--accent); opacity:0; animation:fab-ping 3s ease-out infinite;}
@keyframes fab-ping{0%{transform:scale(1); opacity:.7;} 60%,100%{transform:scale(1.25); opacity:0;}}
.tutor-fab[aria-expanded="true"]::before{animation:none;}
.tutor-fab .mark{width:32px; height:32px; border-radius:50%; background:linear-gradient(135deg, var(--accent), var(--accent-deep)); display:flex; align-items:center; justify-content:center; flex-shrink:0; box-shadow:0 4px 12px -4px rgba(230,116,108,.9);}
.tutor-fab .mark svg{width:17px; height:17px;}
.tutor-panel{
  position:fixed; right:24px; bottom:90px; width:360px; z-index:49;
  background:var(--surface); border-radius:var(--r-lg); box-shadow:var(--shadow-lg); border:1px solid var(--line);
  overflow:hidden; display:flex; flex-direction:column; max-height:min(72vh,580px);
  transform-origin:bottom right; animation:panel-in .35s var(--ease-spring) both;
}
@keyframes panel-in{from{opacity:0; transform:translateY(16px) scale(.94);} to{opacity:1; transform:none;}}
.tutor-panel .head{background:var(--night); color:#fff; padding:14px 16px; display:flex; align-items:center; gap:10px; flex-shrink:0; position:relative; overflow:hidden;}
.tutor-panel .head::after{content:""; position:absolute; right:-40px; top:-40px; width:120px; height:120px; border-radius:50%; background:radial-gradient(circle, rgba(151,188,233,.35), transparent 65%); pointer-events:none;}
.tutor-panel .head .mark{width:28px; height:28px; border-radius:50%; background:linear-gradient(135deg, var(--accent), var(--accent-deep)); display:flex; align-items:center; justify-content:center; flex-shrink:0;}
.tutor-panel .head .mark svg{width:15px; height:15px;}
.tutor-panel .head b{font-family:var(--font-h); font-size:14px;}
.tutor-panel .head span{display:block; font-size:10.5px; opacity:.7;}
.tutor-panel .head .head-txt{flex:1; min-width:0; position:relative;}
.tutor-dot{display:inline-block; width:7px; height:7px; border-radius:50%; margin-left:6px; vertical-align:middle; background:var(--mute-2);}
.tutor-dot.on{background:#4ade80; box-shadow:0 0 0 3px rgba(74,222,128,.25);}
.tutor-mode{border:1px solid rgba(255,255,255,.25); background:rgba(255,255,255,.1); color:#fff; border-radius:20px; padding:4px 10px; font:inherit; font-size:11px; font-weight:600; cursor:pointer; flex-shrink:0; position:relative; transition:background .2s;}
.tutor-mode:hover{background:rgba(255,255,255,.22);}
.msg-bot p{margin:0 0 6px; max-width:none;} .msg-bot p:last-child{margin-bottom:0;}
.msg-bot ul{margin:4px 0 6px; padding-left:18px;} .msg-bot li{margin:2px 0;}
.msg-stream::after{content:"▍"; color:var(--accent); animation:blink 1s steps(2) infinite;}
@keyframes blink{to{opacity:0;}}
.tutor-sources button{background:var(--blue-100); border-color:var(--blue);}
.tutor-rate{align-self:flex-start; display:flex; align-items:center; gap:6px; font-size:11.5px; color:var(--mute);}
.tutor-rate button{border:1px solid var(--line); background:var(--surface); border-radius:20px; padding:2px 8px; cursor:pointer; font-size:13px; transition:transform .2s var(--ease-spring);}
.tutor-rate button:hover{transform:scale(1.15);}
.tutor-reset{border:none; background:rgba(255,255,255,.12); color:#fff; width:28px; height:28px; border-radius:50%; cursor:pointer; display:flex; align-items:center; justify-content:center; flex-shrink:0; position:relative; transition:transform .4s var(--ease-spring), background .2s;}
.tutor-reset:hover{background:rgba(255,255,255,.22); transform:rotate(-180deg);}
.tutor-panel .messages{padding:14px 16px; display:flex; flex-direction:column; gap:10px; overflow-y:auto; flex:1; min-height:160px; background:var(--paper);}
.msg{border-radius:14px; padding:10px 13px; font-size:13.3px; line-height:1.45; max-width:88%; animation:msg-in .35s var(--ease-out) both;}
@keyframes msg-in{from{opacity:0; transform:translateY(8px) scale(.97);} to{opacity:1; transform:none;}}
.msg-user{align-self:flex-end; background:var(--night); color:#fff; border-bottom-right-radius:4px;}
.msg-bot{align-self:flex-start; background:var(--surface); border:1px solid var(--line); border-bottom-left-radius:4px;}
.msg-src{align-self:flex-start; font-size:10.5px; color:var(--mute); max-width:88%; margin-top:-4px; padding-left:2px;}
.msg-refuse{border-color:var(--accent-300); background:var(--accent-100);}
.tutor-suggest{display:flex; flex-wrap:wrap; gap:6px; align-self:flex-start;}
.tutor-suggest button{border:1px solid var(--line); background:var(--surface); color:var(--ink-soft); border-radius:20px; padding:6px 12px; font-size:11.5px; font-weight:600; cursor:pointer; font-family:inherit; transition:all .2s var(--ease-out);}
.tutor-suggest button:hover{background:var(--blue-soft); border-color:var(--blue); color:var(--night); transform:translateY(-1px);}
.tutor-typing{align-self:flex-start; display:flex; gap:5px; padding:10px 12px; background:var(--surface); border:1px solid var(--line); border-radius:14px;}
.tutor-typing span{width:7px; height:7px; border-radius:50%; background:var(--blue-700); animation:tdot 1s ease-in-out infinite;}
.tutor-typing span:nth-child(2){animation-delay:.15s;} .tutor-typing span:nth-child(3){animation-delay:.3s;}
@keyframes tdot{0%,60%,100%{opacity:.35; transform:translateY(0);} 30%{opacity:1; transform:translateY(-4px);}}
.tutor-input-row{display:flex; gap:8px; padding:10px 12px; border-top:1px solid var(--line); flex-shrink:0; background:var(--surface);}
.tutor-input-row input{flex:1; min-width:0; border:1.5px solid var(--line); border-radius:20px; padding:10px 14px; font:inherit; font-size:13.5px; background:var(--paper); transition:border-color .2s, box-shadow .2s;}
.tutor-input-row input:focus{outline:none; border-color:var(--blue-700); box-shadow:0 0 0 4px var(--blue-100);}
.tutor-send{width:38px; height:38px; border-radius:50%; border:none; background:var(--night); color:#fff; cursor:pointer; display:flex; align-items:center; justify-content:center; flex-shrink:0; transition:transform .25s var(--ease-spring), background .2s;}
.tutor-send:hover{background:var(--accent-deep); transform:scale(1.08);}
.tutor-send:disabled{opacity:.45; cursor:not-allowed;}

/* ===================================================================
   TOAST
   =================================================================== */
.toast{
  position:fixed; left:50%; bottom:26px; transform:translateX(-50%) translateY(30px) scale(.95);
  background:var(--night); color:#fff; padding:11px 22px; border-radius:30px; font-size:13.5px; font-weight:600;
  box-shadow:var(--shadow-lg); z-index:80; opacity:0; transition:opacity .25s, transform .4s var(--ease-spring); pointer-events:none;
  max-width:90vw; text-align:center; border:1px solid rgba(151,188,233,.35);
}
.toast.show{opacity:1; transform:translateX(-50%) translateY(0) scale(1);}

/* ===================================================================
   LESSON
   =================================================================== */
.lesson-shell{max-width:820px; margin:0 auto; padding:32px 0 96px;}
.lesson-back{margin-bottom:20px;}
.lesson-head{margin-bottom:26px;}
.lesson-head .lweek{font-size:11.5px; font-weight:600; letter-spacing:.06em; color:var(--accent-deep); background:var(--accent-100); padding:5px 11px; border-radius:20px; display:inline-block; margin-bottom:12px;}
.lesson-head h1{font-size:clamp(22px,2.6vw,30px); margin:0 0 12px; text-wrap:balance; color:var(--night);}
.lesson-meta-row{display:flex; gap:8px; flex-wrap:wrap; margin-bottom:16px;}
.syllabus-quote{border-left:3px solid var(--blue); background:var(--blue-100); border-radius:0 var(--r-md) var(--r-md) 0; padding:12px 18px; color:var(--ink-soft); font-size:13.5px; font-style:italic; margin:0;}
.syllabus-quote cite{display:block; font-style:normal; font-size:11px; margin-top:8px; color:var(--mute);}

.lsec{margin:34px 0;}
.lsec h2{font-size:17px; margin:0 0 14px; display:flex; align-items:center; gap:10px; color:var(--night);}
.lsec h2 .n{width:26px; height:26px; border-radius:50%; background:var(--night); color:#fff; display:inline-flex; align-items:center; justify-content:center; font-size:12px; font-family:var(--font-h); font-weight:700; flex-shrink:0;}
.obj-list{margin:0; padding:0; list-style:none; display:flex; flex-direction:column; gap:10px; font-size:14.4px; max-width:66ch;}
.obj-list li{position:relative; padding-left:30px;}
.obj-list li::before{content:""; position:absolute; left:0; top:4px; width:18px; height:18px; border-radius:50%; background:var(--blue-soft); }
.obj-list li::after{content:""; position:absolute; left:6px; top:8px; width:5px; height:8px; border:solid var(--night); border-width:0 2px 2px 0; transform:rotate(45deg);}
.term-chips{display:flex; flex-wrap:wrap; gap:8px;}
.term-chip{
  background:var(--surface); color:var(--night); border:1px solid var(--line); border-radius:10px; padding:7px 13px; font-size:13.3px; font-weight:600;
  transition:transform .2s var(--ease-spring), box-shadow .2s, border-color .2s, background .2s; cursor:default;
}
.term-chip:hover{transform:translateY(-2px) scale(1.03); box-shadow:var(--shadow-md); border-color:var(--blue); background:var(--blue-100);}

.deck-embed{border:1px solid var(--line); border-radius:var(--r-lg); overflow:hidden; background:var(--night); box-shadow:var(--shadow-md); position:relative;}
.deck-embed iframe{display:block; width:100%; aspect-ratio:16/9.6; border:0; background:var(--night);}
.deck-actions{display:flex; align-items:center; gap:14px; flex-wrap:wrap; margin-top:12px;}
.deck-hint{font-size:12.5px; color:var(--mute);}
/* ---------- video (YouTube) ---------- */
.h2-count{font-family:var(--font-b); font-weight:600; font-size:11.5px; color:var(--night); background:var(--blue-soft); padding:3px 9px; border-radius:20px; margin-left:2px;}
.video-sec{display:grid; grid-template-columns:1fr; gap:14px;}
.video-sec.has-list{grid-template-columns:minmax(0,1.6fr) minmax(220px,1fr);}
.video-box{position:relative; border:1px solid var(--line); border-radius:var(--r-lg); overflow:hidden; background:var(--night); box-shadow:var(--shadow-md); aspect-ratio:16/9;}
.video-box iframe{position:absolute; inset:0; width:100%; height:100%; border:0; display:block; background:var(--night);}
.video-facade{position:absolute; inset:0; width:100%; height:100%; border:0; padding:0; background:var(--night); cursor:pointer; overflow:hidden; text-align:left;}
.video-facade img{position:absolute; inset:0; width:100%; height:100%; object-fit:cover; opacity:.85; transition:transform .6s var(--ease-out), opacity .3s;}
.video-facade:hover img{transform:scale(1.04); opacity:1;}
.video-facade::after{content:""; position:absolute; inset:0; background:linear-gradient(180deg, transparent 40%, rgba(14,42,71,.85));}
.vplay{position:absolute; left:50%; top:50%; width:68px; height:68px; margin:-34px 0 0 -34px; border-radius:50%; background:var(--accent); color:#fff; display:flex; align-items:center; justify-content:center; z-index:1; box-shadow:0 12px 28px -8px rgba(230,116,108,.9), 0 0 0 0 rgba(230,116,108,.5); transition:transform .3s var(--ease-spring), background .2s; animation:vping 2.4s ease-out infinite;}
@keyframes vping{0%{box-shadow:0 12px 28px -8px rgba(230,116,108,.9), 0 0 0 0 rgba(230,116,108,.55);} 100%{box-shadow:0 12px 28px -8px rgba(230,116,108,.9), 0 0 0 22px rgba(230,116,108,0);}}
.vplay svg{margin-left:3px;}
.video-facade:hover .vplay{transform:scale(1.1); background:var(--accent-deep);}
.video-facade:focus-visible{outline:3px solid var(--blue); outline-offset:-3px;}
.vcap{position:absolute; left:18px; right:18px; bottom:16px; z-index:1; color:#fff; display:flex; flex-direction:column; gap:3px;}
.vcap b{font-family:var(--font-h); font-size:16px; line-height:1.25; text-shadow:0 1px 8px rgba(0,0,0,.4);}
.vcap span{font-size:12px; opacity:.8;}
.video-list{list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:8px; max-height:420px; overflow-y:auto;}
.video-item{display:flex; gap:10px; align-items:center; width:100%; text-align:left; background:var(--surface); border:1px solid var(--line); border-radius:var(--r-md); padding:8px; cursor:pointer; font:inherit; color:var(--ink); transition:transform .2s var(--ease-out), border-color .2s, box-shadow .2s, background .2s;}
.video-item:hover{transform:translateX(3px); border-color:var(--blue); box-shadow:var(--shadow-sm);}
.video-item.is-active{background:var(--blue-100); border-color:var(--blue-700);}
.video-item .vthumb{width:88px; aspect-ratio:16/9; object-fit:cover; border-radius:8px; flex-shrink:0; background:var(--night);}
.video-item .vmeta{display:flex; flex-direction:column; gap:2px; min-width:0;}
.video-item .vmeta b{font-size:13px; line-height:1.3; color:var(--night);}
.video-item .vmeta span{font-size:11.5px; color:var(--mute);}
.video-hint{margin-top:10px;}

.mtq{border:1px solid var(--line); border-radius:var(--r-md); padding:14px 16px; margin-bottom:10px; background:var(--surface); transition:border-color .2s, box-shadow .2s;}
.mtq:hover{border-color:var(--blue); box-shadow:var(--shadow-sm);}
.mtq p{margin:0 0 10px; font-size:14.2px; max-width:none;}
.mtq .hint-btn{font-size:12px; padding:6px 12px;}
.mtq .hint{font-size:12.8px; color:var(--ink-soft); background:var(--blue-100); border-radius:var(--r-sm); padding:9px 12px; display:none; margin-top:9px; max-width:none; animation:nd-in .3s var(--ease-out);}
.mtq .hint.show{display:block;}

.case-box{display:flex; flex-direction:column; gap:12px; max-width:none;}
.case-box p.prompt{background:var(--cream); border:1px solid var(--sand); border-left:3px solid var(--accent); border-radius:var(--r-md); padding:12px 16px; font-size:14px; margin:0; max-width:none;}
.case-box textarea{width:100%; min-height:120px; border:1.5px solid var(--line); border-radius:var(--r-md); padding:12px 14px; font:inherit; font-size:14px; resize:vertical; background:var(--surface); transition:border-color .2s, box-shadow .2s;}
.case-box textarea:focus{outline:none; border-color:var(--blue-700); box-shadow:0 0 0 4px var(--blue-100);}
.case-actions{display:flex; align-items:center; gap:12px; flex-wrap:wrap;}
.saved-tag{font-size:12.5px; color:var(--ok); font-weight:600; display:none; align-items:center; gap:4px;}
.saved-tag.show{display:inline-flex; animation:pop-in .3s var(--ease-spring);}

.banner{border-radius:var(--r-md); padding:18px 20px; display:flex; gap:14px; align-items:flex-start;}
.banner-warn{background:var(--cream); border:1px solid var(--sand);}
.banner-warn svg{flex-shrink:0; color:#7a5a2a; width:22px; height:22px; margin-top:1px;}
.banner h3{margin:0 0 4px; font-size:14.5px; color:#5c3f0f;}
.banner p{margin:0; font-size:13px; color:#6b4c17; max-width:none;}
.banner-info{background:var(--blue-100); border:1px solid var(--blue-soft);}
.banner-info svg{color:var(--night);}
.banner-info h3{color:var(--night);}
.banner-info p{color:var(--ink-soft);}
.lesson-nav{display:flex; justify-content:space-between; gap:12px; margin-top:38px; padding-top:22px; border-top:1px solid var(--line); flex-wrap:wrap;}
.done-wrap{display:flex; align-items:center; gap:14px; flex-wrap:wrap;}
.done-ok{display:inline-flex; align-items:center; gap:8px; color:var(--ok); font-weight:600; font-size:13.5px;}

/* confetti canvas */
.confetti{position:fixed; inset:0; width:100%; height:100%; pointer-events:none; z-index:90;}

/* page transitions */
.page-enter{animation:page-in .45s var(--ease-out) both;}
@keyframes page-in{from{opacity:0; transform:translateY(12px);} to{opacity:1; transform:none;}}
::view-transition-old(root){animation:vt-out .18s ease-in both;}
::view-transition-new(root){animation:vt-in .3s var(--ease-out) both;}
@keyframes vt-out{to{opacity:0;}}
@keyframes vt-in{from{opacity:0; transform:translateY(8px);} to{opacity:1; transform:none;}}


/* ---------- quiz (mini-test + АБ) ---------- */
.lsec-sub{color:var(--mute); font-size:13.3px; margin:-6px 0 14px; max-width:70ch;}
.h2-count--ok{background:var(--ok-soft); color:var(--ok);}
.mtq-actions{display:flex; gap:8px; flex-wrap:wrap;}
.slide-btn{font-size:12px; padding:6px 12px;}
.quiz-card{position:relative; border:1px solid var(--line); border-radius:var(--r-lg); padding:18px 20px; margin-bottom:14px; background:var(--surface); transition:border-color .3s, box-shadow .3s;}
.quiz-card.is-ok{border-color:var(--ok);}
.quiz-card.is-bad{border-color:var(--accent);}
.quiz-top{display:flex; align-items:center; gap:10px; margin-bottom:8px;}
.quiz-num{font-family:var(--font-h); font-weight:700; font-size:12px; color:var(--mute); letter-spacing:.04em;}
.quiz-week{font-size:11px; font-weight:600; color:var(--night); background:var(--blue-soft); padding:2px 8px; border-radius:20px;}
.quiz-card p.qtext{font-weight:600; font-size:15px; margin:0 0 14px; max-width:none; line-height:1.45; color:var(--night);}
.quiz-opts{display:flex; flex-direction:column; gap:8px;}
.qopt{display:flex; align-items:flex-start; gap:12px; text-align:left; border:1.5px solid var(--line); background:var(--paper); border-radius:var(--r-md); padding:11px 14px; cursor:pointer; font:inherit; font-size:14px; line-height:1.4; color:var(--ink); transition:transform .2s var(--ease-out), border-color .2s, background .2s, box-shadow .2s;}
.qopt:hover:not([disabled]){border-color:var(--blue-700); background:var(--surface); transform:translateX(3px); box-shadow:var(--shadow-sm);}
.qletter{flex-shrink:0; width:26px; height:26px; border-radius:50%; background:var(--blue-soft); color:var(--night); font-family:var(--font-h); font-weight:700; font-size:12px; display:inline-flex; align-items:center; justify-content:center; transition:background .2s, color .2s;}
.qopt.qopt-correct{background:var(--ok-soft); border-color:var(--ok); color:#1f5f47; font-weight:600;}
.qopt.qopt-correct .qletter{background:var(--ok); color:#fff;}
.qopt.qopt-wrong{background:var(--accent-100); border-color:var(--accent); color:var(--accent-deep); animation:shake .4s var(--ease-out);}
.qopt.qopt-wrong .qletter{background:var(--accent-deep); color:#fff;}
.qopt[disabled]{cursor:default; opacity:.85;}
.qopt.qopt-correct[disabled],.qopt.qopt-wrong[disabled]{opacity:1;}
.quiz-why{margin-top:12px; padding:12px 14px; border-radius:var(--r-md); background:var(--blue-100); font-size:13.5px; line-height:1.5; animation:nd-in .35s var(--ease-out);}
.quiz-why p{margin:6px 0 8px; max-width:none; color:var(--ink-soft);}
.why-head{display:flex; align-items:center; gap:6px; font-weight:700; font-size:13.5px;}
.why-head.ok{color:var(--ok);} .why-head.bad{color:var(--accent-deep);}
.why-src{font-size:12px; color:var(--mute);}
.why-src .link-btn{font-size:12px;}
.quiz-summary{text-align:center; padding:26px 22px; background:var(--surface); border:1px solid var(--line); border-radius:var(--r-lg); animation:nd-in .4s var(--ease-out);}
.quiz-summary .score{font-family:var(--font-h); font-weight:700; font-size:40px; color:var(--night); line-height:1;}
.quiz-summary p{margin:10px auto 18px; max-width:46ch; color:var(--ink-soft);}
.ab-intro{margin-bottom:20px;}
.ab-intro h4{margin-bottom:10px;}
.ab-intro .obj-list{margin-bottom:18px;}
.ab-progress{display:flex; align-items:center; gap:14px; margin-bottom:14px;}
.ab-bar{display:block; flex:1; height:8px; background:var(--line); border-radius:6px; overflow:hidden;}
.ab-bar span{display:block; height:100%; background:linear-gradient(90deg, var(--night-3), var(--blue-700)); border-radius:6px; transition:width .5s var(--ease-out);}
.ab-count{font-size:12.5px; color:var(--mute); font-weight:600; white-space:nowrap;}
.ab-next{margin-top:14px; animation:pop-in .3s var(--ease-spring);}
.ab-weeks{display:grid; grid-template-columns:repeat(auto-fit,minmax(150px,1fr)); gap:8px; margin:18px 0; text-align:left;}
.ab-week{display:flex; flex-direction:column; gap:6px; background:var(--paper); border:1px solid var(--line); border-radius:var(--r-md); padding:10px 12px; font:inherit; font-size:12px; color:var(--mute); cursor:pointer; text-align:left; transition:transform .2s var(--ease-out), border-color .2s;}
.ab-week:hover{transform:translateY(-2px); border-color:var(--blue);}
.ab-week b{color:var(--night); font-size:13px;}
.ab-week .bar-track{flex:none; width:100%; height:8px;}
.ab-week .bar-fill{transition:none;}
.ab-list{display:flex; flex-direction:column; gap:8px;}
.ab-row{display:flex; align-items:center; gap:10px; width:100%; text-align:left; background:var(--paper); border:1px solid var(--line); border-radius:var(--r-md); padding:10px 12px; font:inherit; cursor:pointer; color:var(--ink); transition:transform .2s var(--ease-out), border-color .2s, background .2s;}
.ab-row:hover{transform:translateX(3px); border-color:var(--blue); background:var(--surface);}
.ab-dot{width:10px; height:10px; border-radius:50%; background:var(--line-strong); flex-shrink:0;}
.ab-dot.ok{background:var(--ok); box-shadow:0 0 0 3px var(--ok-soft);} .ab-dot.bad{background:var(--accent); box-shadow:0 0 0 3px var(--accent-100);}
.ab-txt{display:flex; flex-direction:column; gap:1px; min-width:0; flex:1;}
.ab-txt b{font-size:13px; color:var(--night);} .ab-txt span{font-size:11.5px; color:var(--mute);}
.ab-arrow{color:var(--mute);}
.side-ab{margin-top:6px; padding-top:6px; border-top:1px dashed var(--line);}
.side-ab + .side-ab{margin-top:0; padding-top:0; border-top:0;}
.side-ab button{font-weight:600;}
@media (max-width:1080px){ .side-ab{margin-top:0; padding-top:0; border-top:0;} }

/* ===================================================================
   RESPONSIVE
   =================================================================== */
@media (max-width:1080px){
  .layout{display:flex; flex-direction:column; gap:22px; padding-top:20px;}
  .rail-left{position:static; order:0; align-self:stretch; min-width:0; max-width:100%;}
  .rail-left h3{margin-left:0;}
  .unit-list{flex-direction:row; gap:8px; overflow-x:auto; padding:4px 2px 10px; scrollbar-width:none; -webkit-overflow-scrolling:touch; scroll-snap-type:x proximity;}
  .unit-list::-webkit-scrollbar{display:none;}
  .unit-list .slider{display:none;}
  .unit-list li{flex-shrink:0; scroll-snap-align:start;}
  .unit-list li button{white-space:nowrap; background:var(--surface); border:1px solid var(--line); border-radius:20px; padding:7px 12px; font-size:12.8px;}
  .unit-list li button:hover{transform:none;}
  .unit-list li .current{background:var(--night); color:#fff; border-color:var(--night);}
  .unit-list li .current .dot{background:var(--accent); box-shadow:none;}
  .roadmap-wrap-outer{order:1;}
  .rail-right{display:contents;}
  .rail-right .card{order:3;}
  .rail-right .card--hero{order:0;}
  .legend-section{margin-top:44px;}
}
@media (max-width:900px){
  .auth-stage{grid-template-columns:1fr;}
  .auth-hero{padding:28px 20px 24px; min-height:auto;}
  .hero-body{padding:22px 0 8px; margin:0;}
  .hero-title{font-size:clamp(26px,7vw,34px); max-width:none;}
  .hero-sub{font-size:14.5px; margin-bottom:18px;}
  .hero-stats{gap:18px;}
  .stat b{font-size:26px;}
  .hero-foot,.marquee{display:none;}
  .auth-slot{padding:22px 16px 40px; margin-top:-18px; border-radius:22px 22px 0 0;}
  .auth-card{padding:26px 20px; max-width:none;}
  .auth-card.wide{max-width:none;}
}
@media (max-width:720px){
  header.top .row{padding:10px 16px; gap:10px;}
  .wordmark .tagline,.head-progress span.lbl{display:none;}
  .head-progress .track{width:72px;}
  .app{padding:0 16px;}
  footer.note{padding:0 16px 96px;}
  .roadmap-head h1{font-size:24px;}
  .node-item{height:112px;}
  .node-item.x0 .hit,.node-item.x1 .hit,.node-item.x2 .hit{left:0;}
  .node-shape{width:54px; height:54px; font-size:14px;}
  .node-copy{max-width:calc(100vw - 120px);}
  .roadmap-wrap svg.path{display:none;}
  .node-list::before{content:""; position:absolute; left:26px; top:40px; bottom:40px; border-left:2px dashed var(--line-strong); z-index:-1;}
  .node-list::after{content:""; position:absolute; left:26px; top:40px; height:var(--beam-h,0%); border-left:3px solid var(--blue-700); border-radius:3px; z-index:-1; box-shadow:0 0 8px rgba(151,188,233,.7); transition:height .3s;}
  .node-item .hit{padding:6px; margin:-6px; gap:12px;}
  .lesson-shell{padding:22px 0 110px;}
  .lesson-head h1{font-size:22px;}
  .tutor-fab{right:16px; bottom:16px; padding:10px 14px 10px 10px; font-size:13px;}
  .tutor-panel{right:0; left:0; bottom:0; width:100%; max-height:min(78vh, 620px); border-radius:22px 22px 0 0; transform-origin:bottom center;}
  .tutor-fab[aria-expanded="true"]{opacity:0; pointer-events:none;}
  .tutor-panel .head{padding:14px 16px 12px;}
  .toast{bottom:auto; top:14px; transform:translateX(-50%) translateY(-20px) scale(.95);}
  .toast.show{transform:translateX(-50%) translateY(0) scale(1);}
  .two-col{grid-template-columns:1fr;}
  .lesson-nav .btn{flex:1;}
  .consent-actions .btn{flex:1 1 100%;}
  .ab-next{width:100%; margin-bottom:56px;}
  .ab-weeks{grid-template-columns:1fr 1fr;}
  .deck-actions{flex-direction:column; align-items:flex-start;}
  .video-sec.has-list{grid-template-columns:1fr;}
  .video-list{max-height:none;}
  .vcap b{font-size:14px;}
  .vplay{width:56px; height:56px; margin:-28px 0 0 -28px;}
  .legend-grid{grid-template-columns:1fr 1fr;}
}
@media (max-width:420px){
  .legend-grid{grid-template-columns:1fr;}
  .hero-stats{gap:14px;}
  .stat{min-width:70px;}
  .card{padding:16px 16px;}
}
@media (hover:none){
  .card:hover{transform:none;}
  .card::before{display:none;}
}