:root{
  --ink:#183153;--muted:#60738d;--blue:#4d73f8;--purple:#7d5ce7;--green:#39b98a;
  --yellow:#f5bd45;--pink:#e86c9d;--red:#dc5b5b;--bg:#f4f7fd;--card:#fff;
  --line:#dfe7f3;--shadow:0 18px 50px rgba(45,70,110,.12);--radius:24px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #9ec5ff;outline-offset:2px}
.skip{position:fixed;left:14px;top:-80px;z-index:1000;background:#fff;color:var(--ink);padding:10px 14px;border-radius:12px}
.skip:focus{top:14px}
.topbar{position:sticky;top:0;z-index:80;display:flex;align-items:center;justify-content:space-between;gap:24px;padding:12px max(20px,calc((100vw - 1240px)/2));background:rgba(255,255,255,.92);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:11px;color:inherit;text-decoration:none;min-width:max-content}
.brand img{width:48px;height:48px;object-fit:contain;border-radius:14px;background:#fff}
.brand strong{display:block;font-size:20px;line-height:1}
.brand small{display:block;color:var(--muted);font-size:11px;margin-top:4px}
.desktop-nav{display:flex;gap:6px;align-items:center}
.desktop-nav button,.ghost{border:0;background:transparent;color:var(--ink);font-weight:800;border-radius:12px;padding:10px 12px}
.desktop-nav button:hover,.ghost:hover{background:#edf2fb}
.top-actions{display:flex;gap:8px;align-items:center}
.primary{border:0;background:var(--ink);color:#fff;font-weight:900;border-radius:14px;padding:12px 18px;box-shadow:0 8px 18px rgba(24,49,83,.16)}
.primary:hover{transform:translateY(-1px)}
.primary.small{padding:10px 15px}
.secondary{border:1px solid #cfd9e8;background:#fff;color:var(--ink);font-weight:850;border-radius:14px;padding:11px 15px}
.danger{background:#fff0f0;color:#a73f3f;border:1px solid #f0caca}
main{width:min(1240px,calc(100% - 40px));margin:auto;padding:34px 0 90px}
.hero{display:grid;grid-template-columns:1.13fr .87fr;gap:28px;align-items:stretch}
.hero-copy,.hero-panel,.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.hero-copy{padding:clamp(28px,5vw,66px);background:
  radial-gradient(circle at 90% 8%,rgba(245,189,69,.22),transparent 28%),
  radial-gradient(circle at 8% 92%,rgba(77,115,248,.12),transparent 30%),#fff}
.eyebrow,.chip{display:inline-flex;align-items:center;gap:6px;border-radius:999px;background:#edf3ff;color:#395fbf;padding:7px 10px;font-size:12px;font-weight:900}
.hero h1{font-size:clamp(44px,7vw,84px);line-height:.96;letter-spacing:-.055em;margin:18px 0}
.hero h1 span{color:var(--blue)}
.hero p{font-size:clamp(17px,2vw,22px);line-height:1.55;color:var(--muted);max-width:760px}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}
.hero-panel{padding:28px;display:flex;flex-direction:column;justify-content:space-between;background:linear-gradient(145deg,#f6f9ff,#fff)}
.hero-panel h2{margin:10px 0 8px;font-size:28px}
.path-list{display:grid;gap:10px;margin-top:18px}
.path-row{display:grid;grid-template-columns:42px 1fr auto;align-items:center;gap:12px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:12px}
.path-icon{width:42px;height:42px;border-radius:13px;display:grid;place-items:center;background:#edf2ff;font-size:22px}
.muted{color:var(--muted)}
.section{margin-top:32px}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:15px}
.section-head h2{font-size:30px;margin:0}
.section-head p{color:var(--muted);margin:5px 0 0}
.grid{display:grid;gap:16px}
.grid.three{grid-template-columns:repeat(3,1fr)}
.grid.four{grid-template-columns:repeat(4,1fr)}
.card{padding:20px}
.track-card{position:relative;overflow:hidden;min-height:220px;display:flex;flex-direction:column}
.track-card .track-icon{font-size:34px}
.track-card h3{font-size:21px;margin:12px 0 7px}
.track-card p{color:var(--muted);line-height:1.45;margin:0 0 18px}
.track-card footer{margin-top:auto;display:flex;justify-content:space-between;align-items:center}
.progress-line{height:8px;background:#e9eef7;border-radius:999px;overflow:hidden}
.progress-line i{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--purple));border-radius:inherit}
.stat{font-weight:900;font-size:28px}
.stat-card small{color:var(--muted);font-weight:700}
.banner{display:flex;align-items:center;justify-content:space-between;gap:22px;padding:24px;border-radius:22px;background:var(--ink);color:#fff}
.banner p{margin:5px 0 0;color:#c8d5e6}
.page-title{margin:5px 0 25px}
.page-title h1{font-size:clamp(36px,5vw,58px);margin:0;letter-spacing:-.04em}
.page-title p{color:var(--muted);font-size:18px}
.filters{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:18px}
.filter{border:1px solid var(--line);background:#fff;color:var(--ink);font-weight:850;padding:9px 13px;border-radius:999px}
.filter.active{background:var(--ink);color:#fff;border-color:var(--ink)}
.lesson-card{display:grid;grid-template-columns:auto 1fr auto;gap:15px;align-items:center}
.lesson-number{width:46px;height:46px;border-radius:14px;background:#eff3fb;display:grid;place-items:center;font-weight:950}
.lesson-card h3{margin:0 0 4px}
.lesson-card p{margin:0;color:var(--muted);font-size:14px}
.locked{opacity:.58}
.status{font-size:12px;font-weight:900;border-radius:999px;padding:6px 9px;background:#eef3fb}
.status.done{background:#e8f8f1;color:#21815e}
.status.next{background:#fff4d9;color:#9a7015}
.lesson-player{max-width:1120px;margin:auto}
.lesson-head{margin-bottom:20px}
.lesson-head h1{font-size:clamp(36px,5vw,58px);margin:10px 0;letter-spacing:-.04em}
.lesson-head p{font-size:18px;color:var(--muted)}
.lesson-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:18px}
.lesson-main{padding:28px}
.lesson-main h2{margin-top:0}
.lesson-main h3{margin-top:28px}
.lesson-step{display:flex;gap:13px;padding:14px 0;border-bottom:1px solid var(--line)}
.lesson-step b{flex:0 0 28px;height:28px;border-radius:9px;background:#edf2ff;display:grid;place-items:center}
.lesson-step p{margin:3px 0;color:var(--muted);line-height:1.5}
.challenge{margin:22px 0;padding:18px;border:1px solid #d6e1f3;background:#f7faff;border-radius:18px}
.challenge h3{margin:0 0 8px}
.lesson-side{display:grid;align-content:start;gap:14px}
.lesson-side .card{box-shadow:none}
.quiz-question{padding:16px;border:1px solid var(--line);border-radius:16px;margin:13px 0}
.quiz-question p{font-weight:850}
.choice{display:block;width:100%;text-align:left;margin:8px 0;border:1px solid var(--line);background:#fff;border-radius:12px;padding:10px 12px}
.choice.selected{border-color:var(--blue);background:#eef3ff}
.choice.correct{border-color:#43b88d;background:#eaf9f3}
.choice.wrong{border-color:#df7777;background:#fff0f0}
.badge-wall{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.badge{padding:18px;text-align:center;border:1px solid var(--line);border-radius:20px;background:#fff}
.badge .icon{font-size:42px}
.badge.locked{filter:grayscale(1)}
.project-card .preview{height:120px;border-radius:16px;background:#edf3ff;display:grid;place-items:center;font-size:46px;margin-bottom:14px}
.project-card h3{margin:8px 0}
.project-card p{color:var(--muted);font-size:14px;line-height:1.45}
.tutor-shell{display:grid;grid-template-columns:320px 1fr;gap:18px}
.tutor-info{align-self:start}
.chat{min-height:560px;display:flex;flex-direction:column}
.chat-log{flex:1;display:flex;flex-direction:column;gap:10px;overflow:auto;max-height:470px;padding-right:4px}
.bubble{max-width:78%;padding:12px 14px;border-radius:16px;line-height:1.45}
.bubble.bot{background:#edf2ff;border-bottom-left-radius:5px}
.bubble.user{margin-left:auto;background:var(--ink);color:#fff;border-bottom-right-radius:5px}
.chat-form{display:grid;grid-template-columns:1fr auto;gap:8px;margin-top:14px}
.chat-form input{border:1px solid var(--line);border-radius:14px;padding:13px}
.grownup-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px}
.dashboard-table{width:100%;border-collapse:collapse}
.dashboard-table th,.dashboard-table td{text-align:left;padding:12px;border-bottom:1px solid var(--line)}
.control-row{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:13px 0;border-bottom:1px solid var(--line)}
.toggle{width:48px;height:28px;border:0;border-radius:999px;background:#cdd7e5;position:relative}
.toggle:after{content:"";position:absolute;width:22px;height:22px;left:3px;top:3px;background:#fff;border-radius:50%;transition:.2s}
.toggle.on{background:var(--green)}
.toggle.on:after{left:23px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
label span{display:block;font-size:12px;font-weight:850;margin-bottom:5px}
input,select,textarea{width:100%;border:1px solid var(--line);border-radius:12px;background:#fff;padding:11px;color:var(--ink)}
textarea{min-height:110px;resize:vertical}
.modal-shell{position:fixed;inset:0;z-index:100}
.modal-backdrop{position:absolute;inset:0;background:rgba(18,35,57,.55);backdrop-filter:blur(5px)}
.modal{position:relative;width:min(620px,calc(100% - 28px));max-height:86vh;overflow:auto;margin:7vh auto;background:#fff;border-radius:26px;padding:26px;box-shadow:0 30px 90px rgba(0,0,0,.25)}
.modal-close{position:absolute;right:15px;top:14px;width:38px;height:38px;border:0;border-radius:50%;background:#eef2f8;font-size:24px}
.age-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:18px 0}
.age-button{border:1px solid var(--line);background:#fff;border-radius:18px;padding:18px;text-align:left}
.age-button:hover,.age-button.active{border-color:var(--blue);background:#f1f5ff}
.age-button b{display:block;font-size:20px}
.age-button span{color:var(--muted);font-size:13px}
.toast{position:fixed;right:18px;bottom:18px;z-index:120;background:var(--ink);color:#fff;padding:12px 16px;border-radius:14px;box-shadow:var(--shadow);transform:translateY(120px);opacity:0;transition:.25s}
.toast.show{transform:translateY(0);opacity:1}
.mobile-nav{display:none}
.notice{padding:14px 16px;border-radius:14px;background:#fff8e8;border:1px solid #eedaa8;color:#725c22;font-size:14px}
.kpi-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.empty{text-align:center;padding:42px;color:var(--muted)}
@media(max-width:980px){
  .desktop-nav{display:none}.hero{grid-template-columns:1fr}.grid.four{grid-template-columns:1fr 1fr}
  .lesson-grid,.tutor-shell{grid-template-columns:1fr}.lesson-side{grid-template-columns:1fr 1fr}
}
@media(max-width:720px){
  .topbar{padding:9px 14px}.top-actions .ghost{display:none}.brand strong{font-size:18px}
  main{width:min(100% - 24px,1240px);padding-top:18px;padding-bottom:96px}
  .grid.three,.grid.four,.kpi-grid{grid-template-columns:1fr}
  .hero-copy,.hero-panel,.card{border-radius:20px}.hero-copy{padding:28px 22px}
  .mobile-nav{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;left:0;right:0;bottom:0;z-index:90;background:#fff;border-top:1px solid var(--line);padding:7px 8px calc(7px + env(safe-area-inset-bottom))}
  .mobile-nav button{border:0;background:#fff;color:var(--muted);font-size:11px;font-weight:850}.mobile-nav span{display:block;font-size:20px;margin-bottom:2px}
  .lesson-side{grid-template-columns:1fr}.badge-wall{grid-template-columns:1fr 1fr}
  .age-grid,.form-grid{grid-template-columns:1fr}.lesson-card{grid-template-columns:auto 1fr}.lesson-card>button{grid-column:2}
  .banner{align-items:flex-start;flex-direction:column}.top-actions{margin-left:auto}
}
.certificate{text-align:center;padding:34px;border:3px double var(--yellow);border-radius:22px;background:linear-gradient(145deg,#fffdf6,#fff)}
.certificate-seal{font-size:58px}.certificate h2{font-size:34px;margin:8px 0}.certificate p{font-size:17px}
@media print{.topbar,.mobile-nav,.filters,.hero-actions,.toast,.lesson-side,.grownup-tabs{display:none!important}body{background:#fff}main{width:100%;padding:0}.card{box-shadow:none}.certificate{margin:20mm auto;max-width:180mm}}