/* Plastic Expert onboarding player — one stylesheet, no framework */
@font-face{font-family:"Inter";font-style:normal;font-weight:100 900;font-display:swap;src:url(fonts/inter-cyr-ext.woff2) format("woff2");unicode-range:U+0460-052F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}
@font-face{font-family:"Inter";font-style:normal;font-weight:100 900;font-display:swap;src:url(fonts/inter-cyr.woff2) format("woff2");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:"Inter";font-style:normal;font-weight:100 900;font-display:swap;src:url(fonts/inter-latin-ext.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C4,U+20C6-20CF,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Inter";font-style:normal;font-weight:100 900;font-display:swap;src:url(fonts/inter-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}

:root{
  --orange:#fa4814; --orange-dark:#d93a0d; --ink:#171717; --ink-2:#4a4744; --ink-3:#8a8580;
  --bg:#f8f7f3; --bg-2:#eee7df; --peach:#fff0e9; --card:#ffffff; --line:#e4ddd3;
  --ok:#1f7a3a; --ok-bg:#e7f4ea; --bad:#b3261e; --bad-bg:#fbe9e7;
  --radius:14px; --radius-s:10px; --shadow:0 1px 2px rgba(23,23,23,.06),0 8px 24px -12px rgba(23,23,23,.18);
  --maxw:1040px; --safe-b:env(safe-area-inset-bottom,0px);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;overflow-x:hidden}
body{margin:0;font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;font-size:17px;line-height:1.55;color:var(--ink);background:var(--bg);min-height:100dvh;overflow-x:hidden;overflow-wrap:anywhere}
img,svg{max-width:100%;height:auto;display:block}
a{color:var(--ink)}
button{font:inherit;color:inherit;cursor:pointer}
button:focus-visible,a:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--orange);outline-offset:2px;border-radius:6px}
h2[tabindex="-1"]:focus,h2[tabindex="-1"]:focus-visible{outline:none}
h1,h2,h3{margin:0;line-height:1.2;font-weight:600;letter-spacing:-.01em}
p{margin:0}
.skip{position:absolute;left:-999px;top:8px;background:#fff;padding:8px 12px;border-radius:8px;z-index:50}
.skip:focus{left:8px}

/* header */
.top{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 16px;background:rgba(248,247,243,.92);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;flex:none}
.brand img{width:99px;height:34px;flex:none}
.brand-sub{font-size:14px;color:var(--ink-2);white-space:nowrap}
.topnav{display:flex;align-items:center;gap:6px;flex:none;min-width:0}
.topnav a{text-decoration:none;font-size:15px;padding:8px 10px;border-radius:8px;color:var(--ink-2)}
@media(max-width:720px){.brand-sub{display:none}}
@media(max-width:520px){.top{padding:8px 10px}.user{display:none}.brand img{width:87px;height:30px}.topnav a{padding:8px 7px;font-size:14px}.btn-ghost{padding:6px 9px}}
.topnav a.active,.topnav a:hover{color:var(--ink);background:var(--bg-2)}
.user{font-size:13px;color:var(--ink-3);padding:0 6px;max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.btn-ghost{background:transparent;border:1px solid var(--line);border-radius:8px;padding:7px 12px;font-size:14px;color:var(--ink-2)}
.btn-ghost:hover{border-color:var(--ink-3);color:var(--ink)}

/* layout */
.main{max-width:var(--maxw);margin:0 auto;padding:20px 16px calc(96px + var(--safe-b))}
@media(min-width:760px){.main{padding:32px 24px calc(100px + var(--safe-b))}}

/* buttons */
.btn-primary{background:var(--orange);color:#fff;border:0;border-radius:var(--radius-s);padding:12px 20px;font-weight:600;font-size:16px;min-height:48px;transition:background .15s,transform .05s}
.btn-primary:hover{background:var(--orange-dark)}
.btn-primary:active{transform:translateY(1px)}
.btn-primary[disabled]{opacity:.5;cursor:default}
.btn-secondary{background:#fff;color:var(--ink);border:1.5px solid var(--line);border-radius:var(--radius-s);padding:11px 18px;font-weight:500;font-size:16px;min-height:48px}
.btn-secondary:hover{border-color:var(--ink-3)}
.btn-nav{background:#fff;color:var(--ink);border:1.5px solid var(--line);border-radius:var(--radius-s);padding:11px 16px;font-size:16px;min-height:48px;min-width:48px}
.btn-nav[disabled]{opacity:.4;cursor:default}
.btn-link{background:none;border:0;padding:0;color:var(--orange-dark);text-decoration:underline;font-size:15px}

/* home */
.hero{display:grid;gap:14px;margin-bottom:28px}
.hero h1{font-size:28px}
@media(min-width:760px){.hero h1{font-size:36px}}
.hero p{color:var(--ink-2);max-width:62ch}
.progress{display:flex;align-items:center;gap:12px;font-size:14px;color:var(--ink-2)}
.bar{flex:1;height:8px;background:var(--bg-2);border-radius:99px;overflow:hidden;max-width:360px}
.bar>span{display:block;height:100%;width:var(--w,0%);background:var(--orange);border-radius:99px;transition:width .3s}
.hero-actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.block{margin:26px 0 8px}
.block h2{font-size:14px;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-3);font-weight:600;margin-bottom:10px}
.lessons{display:grid;gap:10px}
@media(min-width:680px){.lessons{grid-template-columns:1fr 1fr}}
.lesson-card{display:flex;gap:14px;align-items:center;text-decoration:none;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;min-height:72px;transition:border-color .15s,box-shadow .15s}
.lesson-card:hover{border-color:#d2c8ba;box-shadow:var(--shadow)}
.lesson-card .num{flex:none;width:40px;height:40px;border-radius:12px;display:grid;place-items:center;font-weight:600;background:var(--bg-2);color:var(--ink-2);font-size:15px}
.lesson-card.done .num{background:var(--ok-bg);color:var(--ok)}
.lesson-card.current .num{background:var(--peach);color:var(--orange-dark)}
.lesson-card .t{font-weight:500;line-height:1.3}
.lesson-card .m{font-size:13px;color:var(--ink-3);margin-top:3px;display:flex;gap:8px;flex-wrap:wrap}
.lesson-card .state{margin-left:auto;flex:none;font-size:13px;color:var(--ink-3)}
.lesson-card.done .state{color:var(--ok)}

/* lesson */
.lesson-head{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.crumbs{font-size:13px;color:var(--ink-3)}
.crumbs a{color:var(--ink-3);text-decoration:none}
.crumbs a:hover{color:var(--ink)}
.lesson-head h1{font-size:20px;color:var(--ink-2);font-weight:500}
.dots{display:flex;gap:4px;flex-wrap:wrap;margin:6px 0 0}
.dots>i{display:block;width:16px;height:4px;border-radius:2px;background:var(--bg-2)}
.dots>i.on{background:var(--orange)}
.dots>i.seen{background:#d9cfc2}
.slide{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px 18px 22px;box-shadow:var(--shadow);touch-action:pan-y;min-height:300px}
@media(min-width:760px){.slide{padding:32px 36px 34px}}
.slide h2{font-size:24px;margin-bottom:14px}
@media(min-width:760px){.slide h2{font-size:30px;margin-bottom:18px}}
.slide-grid{display:grid;gap:18px}
@media(min-width:760px){.slide-grid.with-img{grid-template-columns:1.15fr 1fr;align-items:start}}
.slide figure{margin:0;background:var(--bg);border-radius:var(--radius-s);overflow:hidden;border:1px solid var(--line)}
.slide figure img{width:100%;max-height:38vh;object-fit:contain;background:#fff}
@media(min-width:760px){.slide figure img{max-height:360px}}
.slide figcaption{font-size:13px;color:var(--ink-3);padding:8px 12px;border-top:1px solid var(--line)}
.slide .text{display:grid;gap:12px;font-size:17px}
@media(min-width:760px){.slide .text{font-size:19px}}
.slide ul{margin:0;padding-left:0;list-style:none;display:grid;gap:10px}
.slide li{position:relative;padding-left:26px}
.slide li::before{content:"";position:absolute;left:0;top:.55em;width:12px;height:12px;border-radius:50%;background:var(--orange)}
.video-fig{margin:0 0 18px;background:var(--bg);border:1px solid var(--line);border-radius:var(--radius-s);overflow:hidden}
.video-title{font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:var(--orange-dark);font-weight:600;padding:10px 12px 6px}
.video-fig video{display:block;width:100%;max-width:100%;height:auto;aspect-ratio:16/9;background:#000;outline:none}
.video-fig video[hidden]{display:none}
.video-notice{padding:14px 12px;font-size:15px;color:var(--ink-2);background:var(--peach)}
.video-notice[hidden]{display:none}
.video-fig figcaption{font-size:15px;color:var(--ink);padding:10px 12px 12px;border-top:1px solid var(--line)}
@media(min-width:760px){.video-fig{max-width:760px}}
.tip{background:var(--peach);border-left:4px solid var(--orange);border-radius:8px;padding:10px 14px;font-size:16px;color:var(--ink-2)}
.slide-end{display:grid;gap:16px;text-align:center;justify-items:center;padding:24px 0}
.slide-end .big{font-size:40px}
.slide-end h2{margin:0}
.slide-end p{color:var(--ink-2);max-width:48ch}
.pdf-card{display:flex;gap:12px;align-items:center;text-decoration:none;background:var(--peach);border:1px solid #f8d8c8;border-radius:var(--radius-s);padding:12px 14px;margin-top:4px}
.pdf-card .ic{flex:none;width:40px;height:40px;border-radius:10px;background:var(--orange);color:#fff;display:grid;place-items:center;font-weight:700;font-size:12px}
.pdf-card .pt{font-weight:500}
.pdf-card .ps{font-size:13px;color:var(--ink-3)}
.actions{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}

/* slide bar (fixed) */
.slidebar{position:fixed;left:0;right:0;bottom:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 16px calc(10px + var(--safe-b));background:rgba(255,255,255,.96);border-top:1px solid var(--line);backdrop-filter:blur(8px)}
.slidebar[hidden]{display:none}
.slidebar .counter{font-variant-numeric:tabular-nums;color:var(--ink-2);font-size:15px}
@media(max-width:420px){.btn-nav span{display:none}}
@media(min-width:760px){.slidebar{padding-left:calc(50% - var(--maxw)/2 + 24px);padding-right:calc(50% - var(--maxw)/2 + 24px)}}

/* quiz */
.quiz{display:grid;gap:14px}
.quiz .qn{font-size:13px;color:var(--ink-3);text-transform:uppercase;letter-spacing:.06em}
.quiz h2{font-size:22px}
.opts{display:grid;gap:8px;margin:0;padding:0;list-style:none}
.opt{width:100%;text-align:left;background:#fff;border:1.5px solid var(--line);border-radius:var(--radius-s);padding:12px 14px 12px 46px;position:relative;font-size:16px;line-height:1.4;min-height:48px}
.opt::before{content:"";position:absolute;left:14px;top:50%;transform:translateY(-50%);width:20px;height:20px;border-radius:50%;border:2px solid #cfc6ba;background:#fff}
.opt:hover{border-color:var(--ink-3)}
.opt[aria-checked="true"]{border-color:var(--orange)}
.opt[aria-checked="true"]::before{border-color:var(--orange);background:radial-gradient(circle,var(--orange) 45%,#fff 50%)}
.opt.correct{border-color:var(--ok);background:var(--ok-bg)}
.opt.correct::before{border-color:var(--ok);background:var(--ok)}
.opt.wrong{border-color:var(--bad);background:var(--bad-bg)}
.opt.wrong::before{border-color:var(--bad);background:var(--bad)}
.opt[disabled]{cursor:default}
.feedback{border-radius:var(--radius-s);padding:12px 14px;font-size:16px}
.feedback.ok{background:var(--ok-bg);color:#14532a}
.feedback.bad{background:var(--bad-bg);color:#7a1b15}
.feedback strong{display:block;margin-bottom:2px}
.score{font-size:44px;font-weight:600;color:var(--orange)}

/* resources */
.res{display:grid;gap:10px}
@media(min-width:680px){.res{grid-template-columns:1fr 1fr}}
.res .pdf-card{margin:0;background:#fff;border-color:var(--line)}
.res .pdf-card:hover{border-color:#d2c8ba;box-shadow:var(--shadow)}
.muted{color:var(--ink-3);font-size:14px}

/* toast */
.toast{position:fixed;left:50%;bottom:calc(84px + var(--safe-b));transform:translateX(-50%);background:var(--ink);color:#fff;padding:10px 16px;border-radius:10px;font-size:14px;z-index:30;max-width:90vw}
.toast[hidden]{display:none}

/* login page (served by server) */
.login-wrap{min-height:100dvh;display:grid;place-items:center;padding:24px 16px}
.login{width:100%;max-width:400px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;box-shadow:var(--shadow);display:grid;gap:14px}
.login img{width:132px;height:auto;margin-bottom:6px}
.login h1{font-size:22px}
.login label{display:grid;gap:6px;font-size:14px;color:var(--ink-2)}
.login input{font:inherit;font-size:17px;padding:12px 14px;border:1.5px solid var(--line);border-radius:var(--radius-s);background:#fff;color:var(--ink);width:100%;min-height:48px}
.login input:focus{outline:none;border-color:var(--orange);box-shadow:0 0 0 3px rgba(250,72,20,.15)}
.login .err{background:var(--bad-bg);color:#7a1b15;padding:10px 12px;border-radius:8px;font-size:14px}
.login .foot{font-size:13px;color:var(--ink-3)}

@media(prefers-reduced-motion:reduce){*{transition:none!important}}