/* =====================================================================
   GRAMMIND — formal education app shell
   Sidebar (desktop) · bottom tab bar (mobile) · FontAwesome icons
   Plus Jakarta Sans / Space Mono · indigo + teal + amber · rose hearts
   ===================================================================== */
:root{
  --bg:#F4F6FC; --bg-2:#ECEFF9; --surface:#FFFFFF; --surface-2:#F1F4FB;
  --ink:#0F1A36; --ink-2:#0A1126; --ink-soft:#36426A;
  --muted:#6B7392; --muted-2:#98A0BE;
  --line:#E5E9F4; --line-2:#D6DCEE; --line-ink:rgba(255,255,255,.10);
  --brand:#3457D5; --brand-2:#5577FF; --brand-deep:#27409E; --brand-soft:#EAEEFF;
  --teal:#0E9FB8; --teal-soft:#E0F4F8;
  --ok:#12A86B; --ok-soft:#E2F6EE;
  --no:#E5484D; --no-soft:#FCE9EA;
  --amber:#EE9C16; --amber-soft:#FCF1DD;
  --on-ink:#E9EDFB; --on-ink-mut:#A4ACCB;
  --r-xl:22px; --r-lg:18px; --r-md:14px; --r-sm:10px; --pill:999px;
  --sh-xs:0 1px 2px rgba(15,26,54,.06);
  --sh-sm:0 4px 12px -6px rgba(15,26,54,.18);
  --sh-card:0 12px 30px -16px rgba(15,26,54,.22);
  --sh-lift:0 22px 44px -20px rgba(15,26,54,.30);
  --sh-brand:0 12px 24px -10px rgba(52,87,213,.45);
  --f-sans:"Plus Jakarta Sans",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --f-mono:"Space Mono",ui-monospace,Menlo,monospace;
  --side-w:250px;
  --container:min(1080px,calc(100% - 48px));
  --ease:cubic-bezier(.22,.61,.36,1); --ease-back:cubic-bezier(.34,1.4,.64,1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--f-sans);color:var(--ink);background:var(--bg);min-height:100vh;line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button,input,textarea,select{font:inherit}
img{max-width:100%;display:block}
h1,h2,h3,h4{font-family:var(--f-sans);font-weight:800;line-height:1.12;letter-spacing:-.02em;color:var(--ink);margin:0}
p{margin:0}
.container{width:var(--container);margin:0 auto}

/* ---------- APP SHELL ---------- */
.layout{display:flex;min-height:100vh}
.content{flex:1;min-width:0;display:flex;flex-direction:column;margin-left:var(--side-w)}
.content-main{flex:1}

/* sidebar (desktop nav) */
.sidebar{position:fixed;top:0;left:0;bottom:0;width:var(--side-w);background:var(--surface);border-right:1px solid var(--line);display:flex;flex-direction:column;padding:20px 16px;z-index:50;overflow-y:auto}
.side-brand{display:flex;align-items:center;gap:11px;padding:6px 8px 18px;border-bottom:1px solid var(--line);margin-bottom:14px}
.side-brand .brand-mark{width:38px;height:38px;flex:none}
.side-brand .bt{display:flex;flex-direction:column;line-height:1}
.side-brand .bn{font-size:19px;font-weight:800;letter-spacing:-.03em;color:var(--ink)}
.side-brand .bn b{color:var(--brand)}
.side-brand .bs{font-family:var(--f-mono);font-size:9.5px;color:var(--muted);letter-spacing:.1em;text-transform:uppercase;margin-top:3px}
.side-section{font-family:var(--f-mono);font-size:10px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--muted-2);padding:8px 10px 6px}
.side-nav{display:flex;flex-direction:column;gap:3px}
.side-link{display:flex;align-items:center;gap:11px;padding:9px 11px;border-radius:11px;color:var(--ink-soft);font-size:13.5px;font-weight:600;transition:background .16s,color .16s;border:1px solid transparent;cursor:pointer;background:none;text-align:left;width:100%}
.side-link i{width:18px;text-align:center;font-size:14px;color:var(--muted);transition:color .16s}
.side-link:hover{background:var(--surface-2);color:var(--ink)}
.side-link:hover i{color:var(--brand)}
.side-link.is-active{background:var(--brand-soft);color:var(--brand-deep);border-color:#dbe2ff}
.side-link.is-active i{color:var(--brand)}
.side-spacer{flex:1}
.side-foot{border-top:1px solid var(--line);padding-top:12px;margin-top:12px;display:flex;flex-direction:column;gap:8px}
.side-user{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:12px;background:var(--surface-2)}
.side-user .su-av{width:32px;height:32px;flex:none;border-radius:50%;background:var(--brand);color:#fff;display:grid;place-items:center;font-weight:700;font-size:14px}
.side-user .su-name{font-size:13px;font-weight:700;color:var(--ink);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* mobile top bar */
.mobile-top{display:none;position:sticky;top:0;z-index:40;background:rgba(255,255,255,.9);backdrop-filter:saturate(1.3) blur(12px);-webkit-backdrop-filter:saturate(1.3) blur(12px);border-bottom:1px solid var(--line);padding:10px 16px;align-items:center;justify-content:space-between}
.mobile-top .brand-mark{width:34px;height:34px}
.mt-brand{display:flex;align-items:center;gap:9px}
.mt-brand .bn{font-size:18px;font-weight:800;letter-spacing:-.03em}
.mt-brand .bn b{color:var(--brand)}

/* in-content tagline bar (desktop) */
.topbar{display:flex;align-items:center;gap:14px;justify-content:space-between;padding:14px 0 0}
.topbar-note{display:inline-flex;align-items:center;gap:9px;font-size:12.5px;color:var(--muted)}
.topbar-note i{color:var(--brand)}
.topbar-note b{color:var(--ink-soft);font-weight:700}
.topbar-actions{display:flex;align-items:center;gap:10px}

main{padding-bottom:40px}

/* ---------- BUTTONS ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:42px;padding:10px 18px;border:0;border-radius:11px;cursor:pointer;font-family:var(--f-sans);font-weight:700;font-size:14px;color:#fff;letter-spacing:-.01em;background:var(--brand);box-shadow:var(--sh-brand);transition:transform .16s var(--ease),box-shadow .18s,background .18s}
.btn i{font-size:13px}
.btn:hover{transform:translateY(-1px);background:var(--brand-deep);box-shadow:0 16px 28px -12px rgba(52,87,213,.55)}
.btn:active{transform:translateY(0)}
.btn-small{min-height:36px;padding:8px 13px;border-radius:9px;font-size:13px}
.btn-lg{min-height:50px;padding:14px 26px;font-size:16px;border-radius:13px}
.btn-secondary{background:var(--surface);color:var(--ink);box-shadow:var(--sh-sm);border:1.5px solid var(--line-2)}
.btn-secondary:hover{background:var(--surface);border-color:var(--brand);color:var(--brand-deep)}
.btn-ghost{background:var(--surface-2);color:var(--ink-soft);box-shadow:none;border:1.5px solid transparent}
.btn-ghost:hover{background:var(--bg-2);color:var(--ink)}
.btn-teal{background:var(--teal);box-shadow:0 12px 24px -10px rgba(14,159,184,.5)}
.btn-teal:hover{background:#0c8ba0}
.btn-ok{background:var(--ok)}
.btn-ok:hover{background:#0e8f5a}
.btn-danger{background:var(--no)}
.btn-danger:hover{background:#cf3a3f}
.btn-block{width:100%}

/* ---------- ICON TILES / BADGES / EYEBROWS ---------- */
.ico-tile{width:46px;height:46px;border-radius:13px;display:grid;place-items:center;font-size:19px;flex:none;background:var(--brand-soft);color:var(--brand)}
.ico-tile.t-teal{background:var(--teal-soft);color:var(--teal)}
.ico-tile.t-amber{background:var(--amber-soft);color:var(--amber)}
.ico-tile.t-ok{background:var(--ok-soft);color:var(--ok)}
.ico-tile.t-rose{background:var(--no-soft);color:var(--no)}
.badge{display:inline-flex;align-items:center;gap:7px;padding:6px 12px;border-radius:var(--pill);background:var(--surface);border:1.5px solid var(--line-2);box-shadow:var(--sh-xs);color:var(--ink-soft);font-family:var(--f-mono);font-weight:700;font-size:11.5px;letter-spacing:.02em}
.badge i{color:var(--brand)}
.muted-badge{display:inline-flex;align-items:center;gap:6px;padding:6px 11px;border-radius:var(--pill);background:rgba(255,255,255,.08);border:1px solid var(--line-ink);color:var(--on-ink-mut);font-family:var(--f-mono);font-weight:700;font-size:11px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--f-mono);font-size:11.5px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--brand)}
.eyebrow i{font-size:12px}
.eyebrow.on-ink{color:#9DB0FF}
.tag{display:inline-flex;align-items:center;gap:6px;padding:6px 11px;border-radius:var(--pill);background:var(--surface-2);color:var(--ink-soft);border:1px solid var(--line-2);font-family:var(--f-mono);font-weight:700;font-size:11.5px}
.tag i{color:var(--muted)}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.rank-chip{display:inline-flex;align-items:center;gap:6px;padding:5px 11px;border-radius:var(--pill);background:var(--brand-soft);color:var(--brand-deep);border:1px solid #dbe2ff;font-family:var(--f-mono);font-weight:700;font-size:12px}

/* ---------- SECTIONS / PANELS / CARDS ---------- */
.section{padding:26px 0}
.section-head{max-width:720px;margin-bottom:22px}
.section-title{margin:10px 0 8px;font-size:clamp(24px,3vw,32px);letter-spacing:-.025em;color:var(--ink)}
.section-subtitle{color:var(--muted);line-height:1.65;font-size:15.5px}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-xl);padding:24px;box-shadow:var(--sh-card)}
.panel-ink{background:var(--ink);color:var(--on-ink);border:1px solid var(--line-ink);border-radius:var(--r-xl);padding:24px;box-shadow:var(--sh-lift)}
.white-panel{background:var(--surface);color:var(--ink);border-radius:var(--r-xl);border:1px solid var(--line);padding:24px;box-shadow:var(--sh-card)}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.card{background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:var(--r-lg);padding:22px;box-shadow:var(--sh-card);transition:transform .22s var(--ease),box-shadow .22s,border-color .22s}
.card:hover{transform:translateY(-3px);box-shadow:var(--sh-lift);border-color:var(--line-2)}
.card.dark{background:var(--ink);color:var(--on-ink);border-color:var(--line-ink)}
.card h3{margin:0 0 8px;font-size:19px}
.card.dark h3{color:#fff}
.card p{margin:0;color:var(--muted);line-height:1.6;font-size:14.5px}
.card.dark p{color:var(--on-ink-mut)}
.card-meta{display:inline-flex;align-items:center;gap:7px;padding:5px 11px;border-radius:var(--pill);background:var(--surface-2);color:var(--brand-deep);border:1px solid var(--line-2);font-family:var(--f-mono);font-weight:700;font-size:11px;margin-bottom:12px}
.card-meta i{color:var(--brand)}
.card.dark .card-meta{background:rgba(255,255,255,.08);color:#9DB0FF;border-color:var(--line-ink)}
.card-actions{display:flex;flex-wrap:wrap;gap:9px;margin-top:16px}
.feature .feat-ico{margin-bottom:14px}

/* hero */
.hero{padding:24px 0 8px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:24px;align-items:center}
.hero-title{margin:14px 0 14px;font-size:clamp(30px,4vw,46px);line-height:1.05;letter-spacing:-.03em;color:var(--ink)}
.hero-title .pen{color:var(--brand);position:relative}
.hero-lead{color:var(--muted);font-size:16px;line-height:1.7;max-width:38em}
.hero-lead strong{color:var(--ink-soft)}
.hero-actions{display:flex;flex-wrap:wrap;gap:11px;margin-top:22px}
.hero-mini-stats{margin-top:24px;display:grid;grid-template-columns:repeat(3,1fr);gap:11px;max-width:430px}
.stat-tile{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);padding:14px;box-shadow:var(--sh-xs)}
.stat-tile strong{display:block;font-size:26px;color:var(--ink);line-height:1;font-weight:800}
.stat-tile span{color:var(--muted);font-size:12px;font-weight:600}
.hero-side{display:flex;flex-direction:column;gap:14px}
.glass-card{background:var(--ink);border:1px solid var(--line-ink);border-radius:var(--r-xl);box-shadow:var(--sh-lift);padding:20px;position:relative;overflow:hidden}
.mock-phone{border-radius:22px;background:var(--bg);color:var(--ink);padding:14px;box-shadow:0 18px 40px -16px rgba(0,0,0,.5);border:5px solid #060c1c}
.mock-phone-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
.mock-phone-top strong{font-size:15px}
.mock-pill{display:inline-flex;align-items:center;gap:5px;padding:5px 9px;border-radius:var(--pill);background:var(--brand-soft);color:var(--brand-deep);font-family:var(--f-mono);font-weight:700;font-size:10.5px}
.mock-card{background:var(--surface);border-radius:14px;padding:13px;box-shadow:var(--sh-xs);margin-bottom:10px;border:1px solid var(--line)}
.mock-card h3{font-size:15px}
.mock-answer{display:flex;gap:8px;align-items:center;padding:10px 12px;border-radius:11px;background:var(--surface-2);margin-top:8px;font-weight:600;font-size:13.5px;border:1px solid transparent}
.mock-answer i{color:var(--no);font-size:13px}
.mock-answer.correct{background:var(--ok-soft);border-color:#bce8d6;color:#0c7a4c}
.mock-answer.correct i{color:var(--ok)}
.mock-footer{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin-top:12px}
.mock-tab{height:40px;border-radius:11px;background:var(--surface-2);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;font-family:var(--f-mono);font-size:9.5px;color:var(--muted);font-weight:700}
.mock-tab i{font-size:13px}
.mock-tab.active{background:var(--brand);color:#fff}
.research-panel{padding:2px}
.research-title{margin:14px 0 10px;font-size:15px;color:var(--on-ink)}
.research-block{background:rgba(255,255,255,.05);border-radius:var(--r-md);border:1px solid var(--line-ink);padding:14px}
.research-block p{margin:0 0 8px;color:var(--on-ink-mut);line-height:1.55;font-size:13px}
.research-block p strong{color:#fff}
.research-meta{display:flex;flex-wrap:wrap;gap:7px;margin-top:10px}

/* page head */
.page-head{padding:18px 0 4px}
.page-shell{background:var(--ink);color:var(--on-ink);border:1px solid var(--line-ink);border-radius:var(--r-xl);padding:26px 26px;box-shadow:var(--sh-lift);position:relative;overflow:hidden}
.page-shell::before{content:"";position:absolute;top:-40%;right:-6%;width:38%;height:150%;background:radial-gradient(circle,rgba(85,119,255,.22),transparent 62%)}
.page-shell>*{position:relative;z-index:1}
.page-head h1{margin:12px 0 10px;font-size:clamp(26px,3.6vw,40px);color:#fff;letter-spacing:-.03em;max-width:20ch}
.page-head p{margin:0;color:var(--on-ink-mut);line-height:1.65;max-width:66ch;font-size:14.5px}

/* kpi + highlights */
.kpi-row{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:16px}
.kpi-box{background:var(--surface-2);border:1px solid var(--line-2);border-radius:var(--r-md);padding:14px}
.kpi-box strong{display:block;font-size:24px;color:var(--ink);font-weight:800}
.kpi-box span{color:var(--muted);font-size:12px;font-weight:600}
.highlight-list{display:grid;gap:10px}
.highlight-item{display:flex;gap:12px;align-items:flex-start;padding:14px;border-radius:var(--r-md);background:var(--surface-2);border:1px solid var(--line-2);transition:transform .2s,border-color .2s}
.highlight-item:hover{transform:translateX(3px);border-color:var(--brand)}
.highlight-item strong{font-size:15.5px}
.highlight-item>div>div{color:var(--muted);margin-top:2px;font-size:13.5px}
.highlight-dot{width:34px;height:34px;border-radius:10px;flex:none;display:grid;place-items:center;background:var(--brand-soft);color:var(--brand);font-weight:800;font-size:14px}

/* ---------- LESSONS DECK ---------- */
.lessons-deck{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.lesson-card{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:22px;box-shadow:var(--sh-card);transition:transform .22s var(--ease),box-shadow .22s,border-color .22s;--accent:var(--brand);--accent-soft:var(--brand-soft)}
.lesson-card:nth-child(3n+2){--accent:var(--teal);--accent-soft:var(--teal-soft)}
.lesson-card:nth-child(3n+3){--accent:var(--amber);--accent-soft:var(--amber-soft)}
.lesson-card::before{content:"";position:absolute;top:0;left:22px;right:22px;height:3px;border-radius:0 0 3px 3px;background:var(--accent)}
.lesson-card:hover{transform:translateY(-4px);box-shadow:var(--sh-lift);border-color:var(--line-2)}
.lesson-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}
.lesson-num{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;background:var(--accent-soft);color:var(--accent);font-weight:800;font-size:17px}
.lesson-cat{font-family:var(--f-mono);font-size:10.5px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--accent);padding:5px 10px;border-radius:var(--pill);background:var(--accent-soft)}
.lesson-card h3{font-size:19px;margin-bottom:8px}
.lesson-card .lesson-summary{color:var(--muted);line-height:1.55;font-size:14px}
.lesson-interference{display:flex;gap:9px;align-items:flex-start;margin:14px 0 2px;padding:11px 12px;background:var(--no-soft);border:1px solid #f5cdcf;border-radius:11px}
.lesson-interference i{flex:none;color:var(--no);font-size:13px;margin-top:2px}
.lesson-interference .li-txt{font-size:12.5px;color:var(--ink-soft);line-height:1.5}
.lesson-interference .li-txt b{color:var(--no);font-family:var(--f-mono);font-size:12px}
.lesson-card .card-actions{margin-top:16px}

/* ---------- LESSON READING ---------- */
.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 296px;gap:24px;align-items:start}
.lesson-main{min-width:0;display:flex;flex-direction:column}
.lesson-content{background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:var(--r-xl);padding:34px 38px;box-shadow:var(--sh-card);line-height:1.85;font-size:16.5px;overflow-wrap:anywhere;word-break:break-word}
.lesson-content h2{font-size:24px;margin:26px 0 10px;color:var(--ink);position:relative;padding-left:15px}
.lesson-content h2::before{content:"";position:absolute;left:0;top:.18em;bottom:.18em;width:5px;border-radius:3px;background:var(--brand)}
.lesson-content h2:first-child{margin-top:0}
.lesson-content h3{font-size:18px;margin:22px 0 8px;color:var(--ink)}
.lesson-content h4{font-size:15.5px;margin:18px 0 6px;color:var(--ink-soft)}
.lesson-content p{margin:0 0 13px}
.lesson-content p strong{color:var(--ink)}
.lesson-content code,.formula{font-family:var(--f-mono);font-size:.86em;background:var(--ink);color:#9DB0FF;padding:2px 8px;border-radius:7px;font-weight:700;white-space:normal;overflow-wrap:anywhere;word-break:break-word;max-width:100%;line-height:1.7}
.lesson-content ul,.lesson-content ol{padding-left:2px;margin:0 0 15px;list-style:none}
.lesson-content li{position:relative;padding-left:27px;margin-bottom:9px}
.lesson-content ul li::before{content:"\f00c";font-family:"Font Awesome 6 Free";font-weight:900;position:absolute;left:2px;top:.05em;color:var(--ok);font-size:11px}
.lesson-content ol{counter-reset:li}
.lesson-content ol li::before{counter-increment:li;content:counter(li);position:absolute;left:0;top:.05em;width:20px;height:20px;border-radius:6px;background:var(--brand-soft);color:var(--brand-deep);font-size:11px;font-weight:800;display:grid;place-items:center}
.lesson-content blockquote{margin:0 0 15px;padding:14px 16px;background:var(--teal-soft);border-left:4px solid var(--teal);border-radius:0 12px 12px 0;color:var(--ink-soft);font-size:14.5px;overflow-wrap:anywhere;word-break:break-word}
.spotlight{margin:0 0 20px;border-radius:var(--r-lg);border:1px solid var(--line);background:var(--surface);box-shadow:var(--sh-card);overflow:hidden}
.spotlight-inner{padding:18px 20px}
.spotlight-label{display:flex;align-items:center;gap:8px;font-family:var(--f-mono);font-size:10.5px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:13px}
.spotlight-label i{color:var(--amber)}
.spotlight-row{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px}
.spot-cell{padding:12px 14px;border-radius:12px;font-weight:600;font-size:15px;line-height:1.4;display:flex;align-items:center;gap:9px}
.spot-cell i{flex:none;font-size:13px}
.spot-wrong{background:var(--no-soft);border:1px solid #f5cdcf;color:#b3343a}
.spot-wrong i{color:var(--no)}
.spot-wrong span{text-decoration:line-through;text-decoration-color:rgba(229,72,77,.5)}
.spot-right{background:var(--ok-soft);border:1px solid #bce8d6;color:#0c7a4c}
.spot-right i{color:var(--ok)}
.spot-arrow{width:34px;height:34px;border-radius:50%;background:var(--brand);color:#fff;display:grid;place-items:center;font-size:14px;flex:none}
.spot-note{margin-top:11px;font-size:13px;color:var(--muted)}
.spot-note b{color:var(--ink-soft)}
.sidebar-card{position:sticky;top:16px;display:grid;gap:12px}
.side-box{background:var(--surface);color:var(--ink);border-radius:var(--r-lg);border:1px solid var(--line);padding:18px;box-shadow:var(--sh-card)}
.side-box h3{font-size:16px;margin:0 0 5px}
.side-box p{color:var(--muted);line-height:1.55;font-size:13.5px;margin:0}
.side-box .card-meta{margin-bottom:9px}
.side-box .card-actions{margin-top:12px}
.pdf-list{display:grid;gap:9px}
.pdf-item{display:flex;justify-content:space-between;align-items:center;gap:10px;background:var(--surface-2);border:1px solid var(--line-2);border-radius:12px;padding:11px 13px}
.pdf-item strong{font-size:13.5px}

/* ---------- GAMES ---------- */
.games-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.game-card{position:relative;border-radius:var(--r-lg);padding:22px;background:var(--surface);border:1px solid var(--line);box-shadow:var(--sh-card);transition:transform .22s var(--ease),box-shadow .22s,border-color .22s;--g:var(--brand);--gs:var(--brand-soft)}
.game-card:nth-child(3n+2){--g:var(--teal);--gs:var(--teal-soft)}
.game-card:nth-child(3n+3){--g:var(--amber);--gs:var(--amber-soft)}
.game-card:hover{transform:translateY(-4px);box-shadow:var(--sh-lift);border-color:var(--line-2)}
.game-card-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}
.game-emoji{width:50px;height:50px;border-radius:14px;display:grid;place-items:center;font-size:22px;background:var(--gs);color:var(--g)}
.game-card .g-badge{font-family:var(--f-mono);font-size:10.5px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;background:var(--surface-2);color:var(--ink-soft);padding:5px 10px;border-radius:var(--pill);border:1px solid var(--line-2)}
.game-card h3{color:var(--ink);font-size:19px;margin:0 0 7px}
.game-card p{color:var(--muted);line-height:1.55;font-size:14px}
.game-meta-row{display:flex;flex-wrap:wrap;gap:7px;margin-top:13px}
.game-meta{font-family:var(--f-mono);font-size:11px;font-weight:700;background:var(--surface-2);color:var(--ink-soft);padding:5px 10px;border-radius:var(--pill);display:inline-flex;align-items:center;gap:5px;border:1px solid var(--line-2)}
.game-meta i{color:var(--g)}
.game-card .card-actions{margin-top:16px}

/* ---------- GAME STAGE ---------- */
.game-stage{background:var(--ink);color:var(--on-ink);border:1px solid var(--line-ink);border-radius:var(--r-xl);padding:24px;box-shadow:var(--sh-lift);position:relative;overflow:hidden}
.game-stage::before{content:"";position:absolute;top:-30%;right:-6%;width:34%;height:90%;background:radial-gradient(circle,rgba(85,119,255,.18),transparent 64%);pointer-events:none}
.game-stage>*{position:relative;z-index:1}
.game-toolbar{display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;align-items:center;margin-bottom:20px;padding-bottom:18px;border-bottom:1px solid var(--line-ink)}
.game-hero h2{color:#fff;font-size:20px;margin:0;display:flex;align-items:center;gap:9px}
.game-hero h2 i{color:#9DB0FF}
.game-subtext{color:var(--on-ink-mut);line-height:1.5;font-family:var(--f-mono);font-size:12px;margin-top:5px}
.game-status{display:flex;flex-wrap:wrap;gap:9px}
.status-chip{display:inline-flex;align-items:center;gap:7px;background:rgba(255,255,255,.07);border:1px solid var(--line-ink);color:#fff;border-radius:var(--pill);padding:8px 13px;font-family:var(--f-mono);font-weight:700;font-size:12.5px}
.status-chip i{opacity:.8}
#gameScore{background:rgba(238,156,22,.16);border-color:rgba(238,156,22,.35);color:#FFC25A}
#gameScore i{color:#FFC25A;opacity:1}
#gameTimer{background:rgba(229,72,77,.16);border-color:rgba(229,72,77,.35);color:#FF8E91}
#gameTimer i{color:#FF8E91;opacity:1}
.timer-low{animation:timer-pulse .6s var(--ease) infinite}
@keyframes timer-pulse{50%{transform:scale(1.07)}}
.game-question{font-size:clamp(19px,2.6vw,26px);font-weight:800;line-height:1.3;margin-bottom:6px;color:#fff;letter-spacing:-.01em}
.choice-grid{display:grid;gap:11px;margin-top:16px}
.choice-btn{width:100%;text-align:left;border:1.5px solid var(--line-ink);background:rgba(255,255,255,.05);color:#fff;border-radius:var(--r-md);padding:14px 16px;cursor:pointer;font-weight:600;font-size:15px;display:flex;align-items:center;gap:13px;transition:transform .14s,background .18s,border-color .18s}
.choice-btn .ch-key{width:28px;height:28px;flex:none;border-radius:8px;display:grid;place-items:center;background:rgba(255,255,255,.1);font-family:var(--f-mono);font-size:12px;font-weight:700;transition:.18s}
.choice-btn:hover:not(:disabled){background:rgba(255,255,255,.1);border-color:var(--brand-2);transform:translateX(2px)}
.choice-btn:hover:not(:disabled) .ch-key{background:var(--brand)}
.choice-btn:disabled{cursor:default}
.choice-btn.correct{background:rgba(18,168,107,.18);border-color:var(--ok);color:#fff}
.choice-btn.correct .ch-key{background:var(--ok)}
.choice-btn.wrong{background:rgba(229,72,77,.16);border-color:var(--no);animation:shake .4s}
.choice-btn.wrong .ch-key{background:var(--no)}
@keyframes shake{0%,100%{transform:translateX(0)}20%{transform:translateX(-6px)}40%{transform:translateX(6px)}60%{transform:translateX(-4px)}80%{transform:translateX(4px)}}
.game-feedback{margin-top:16px;padding:14px 16px;border-radius:var(--r-md);line-height:1.55;font-size:14px;background:rgba(255,255,255,.05);border:1px solid var(--line-ink);color:var(--on-ink-mut);animation:pop-in .3s var(--ease-back)}
.game-feedback strong{font-size:15px;display:inline-flex;align-items:center;gap:7px}
.game-feedback.ok strong{color:#3BD68B}
.game-feedback.no strong{color:#FF8E91}
.game-feedback.ok{background:rgba(18,168,107,.1);border-color:rgba(18,168,107,.3);color:#cdeede}
@keyframes pop-in{from{opacity:0;transform:translateY(8px) scale(.98)}}
.game-controls{display:flex;flex-wrap:wrap;gap:9px;margin-top:16px}
.slot-box{min-height:64px;width:100%;border:2px dashed var(--line-ink);border-radius:var(--r-md);padding:11px;margin:13px 0 16px;background:rgba(255,255,255,.03)}
.slot-box.filled{border-color:rgba(14,159,184,.5);background:rgba(14,159,184,.06)}
.game-sentence-slot,.game-token-bank{display:flex;flex-wrap:wrap;gap:9px}
.token-btn{border:1.5px solid var(--line-ink);background:var(--surface);color:var(--ink);padding:10px 14px;border-radius:11px;cursor:pointer;font-weight:700;font-size:14px;transition:transform .12s var(--ease-back),opacity .18s,background .18s;box-shadow:var(--sh-xs)}
.token-btn:hover:not(:disabled){transform:translateY(-2px)}
.token-btn:active{transform:scale(.95)}
.game-sentence-slot .token-btn{background:var(--teal);color:#fff;border-color:transparent;animation:pop-in .22s var(--ease-back)}
.token-btn.used{opacity:0;pointer-events:none}
.token-btn:disabled{opacity:.25;pointer-events:none}
.game-complete{text-align:center;padding:18px 0 6px;animation:pop-in .4s var(--ease-back)}
.gc-emoji,.gc-ico{font-size:48px;line-height:1;margin-bottom:8px;color:#FFC25A;animation:bounce-in .6s var(--ease-back)}
@keyframes bounce-in{0%{transform:scale(0);opacity:0}60%{transform:scale(1.15)}100%{transform:scale(1)}}
.gc-score{font-size:50px;font-weight:800;color:#fff;line-height:1;margin:3px 0}
.gc-score small{font-size:20px;color:var(--on-ink-mut);font-weight:700}
.game-complete h2{color:#fff;font-size:23px;margin:5px 0}
.game-note{color:var(--on-ink-mut);margin-top:7px;line-height:1.55;font-size:14px}
.game-note.save-ok{color:#3BD68B;font-weight:700}
.login-lock{margin-top:14px;padding:13px 16px;background:rgba(238,156,22,.12);color:#FFC25A;border-radius:var(--r-md);border:1px solid rgba(238,156,22,.3);font-weight:600;font-size:14px;display:flex;align-items:center;gap:9px}
.login-lock i{color:#FFC25A}

/* ---------- TESTS / FORMS / TABLES ---------- */
.test-card-top,.lesson-card-top{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:11px}
.test-description{color:var(--muted);line-height:1.6;font-size:14.5px}
.form-wrap{max-width:480px;margin:30px auto}
.form{background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:var(--r-xl);padding:28px;box-shadow:var(--sh-card)}
.form h1,.form h2{margin:0 0 6px;font-size:26px}
.form label{display:block;margin:14px 0 6px;font-weight:700;color:var(--ink);font-size:13.5px}
input,textarea,select{width:100%;padding:12px 14px;border-radius:11px;border:1.5px solid var(--line-2);background:var(--surface);color:var(--ink);outline:none;transition:border-color .18s,box-shadow .18s}
textarea{min-height:140px;resize:vertical;font-family:var(--f-mono);font-size:13px;line-height:1.6}
input:focus,textarea:focus,select:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(52,87,213,.14)}
.form .btn{width:100%;margin-top:18px}
.help{color:var(--muted);line-height:1.55;font-size:13.5px}
.help a{color:var(--brand);font-weight:700}
.question{margin-bottom:20px}
.question-title{font-weight:800;color:var(--ink);margin-bottom:12px;line-height:1.4;font-size:17px}
.option{display:flex;gap:10px;align-items:flex-start;padding:12px 14px;border-radius:11px;background:var(--surface);border:1.5px solid var(--line-2);margin:9px 0;cursor:pointer;transition:border-color .18s,background .18s}
.option:hover{border-color:var(--brand);background:var(--brand-soft)}
.option input{width:auto;margin-top:3px;accent-color:var(--brand)}
.table-wrap{overflow-x:auto;background:var(--surface);color:var(--ink);border-radius:var(--r-xl);border:1px solid var(--line);box-shadow:var(--sh-card)}
table{width:100%;border-collapse:collapse;min-width:720px}
th,td{padding:14px 16px;border-bottom:1px solid var(--line);text-align:left}
th{font-family:var(--f-mono);font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;background:var(--surface-2)}
tbody tr{transition:background .14s}
tbody tr:hover{background:var(--surface-2)}
tr:last-child td{border-bottom:0}
.score-pill{display:inline-flex;align-items:center;justify-content:center;min-width:36px;height:32px;padding:0 11px;border-radius:var(--pill);background:var(--ink);color:#fff;font-weight:800;font-size:14px}
tbody tr:nth-child(1) .score-pill{background:var(--amber)}
tbody tr:nth-child(2) .score-pill{background:#9aa6c2}
tbody tr:nth-child(3) .score-pill{background:#cf8b54}
.admin-bar{display:flex;flex-wrap:wrap;gap:9px;margin-bottom:16px}
.result-hero{text-align:center}
.flash-wrap{padding-top:14px}
.flash{border-radius:var(--r-md);padding:13px 16px;margin-bottom:9px;font-weight:600;background:var(--surface);border:1.5px solid var(--line-2);box-shadow:var(--sh-card);display:flex;align-items:center;gap:9px;font-size:14px}
.flash i{font-size:15px}
.flash-success{color:#0c7a4c;border-color:#bce8d6}.flash-success i{color:var(--ok)}
.flash-warning{color:#9a6a0c;border-color:#f5dba6}.flash-warning i{color:var(--amber)}
.flash-error{color:#b3343a;border-color:#f5cdcf}.flash-error i{color:var(--no)}
.empty-state{text-align:center;padding:34px 20px}
.empty-state .es-emoji{font-size:40px;margin-bottom:10px;color:var(--muted-2)}
.empty-state h3{margin:0 0 7px;font-size:19px}
.empty-state p{color:var(--muted);font-size:14px}

/* ---------- FOOTER ---------- */
.site-footer{margin-top:30px;background:var(--ink);color:var(--on-ink-mut);border-top:1px solid var(--line-ink);padding:34px 0 28px}
.footer-grid{display:grid;grid-template-columns:1.3fr .7fr .8fr;gap:26px}
.footer-grid h4{margin:0 0 12px;color:#fff;font-size:14.5px}
.footer-grid p,.footer-grid a{color:var(--on-ink-mut);line-height:1.65;font-size:13.5px}
.footer-grid a{display:flex;align-items:center;gap:8px;margin:7px 0;transition:color .18s}
.footer-grid a i{font-size:11px;color:#7E88AE;width:14px}
.footer-grid a:hover{color:#fff}
.footer-grid a:hover i{color:var(--brand-2)}
.footer-brand{display:flex;align-items:flex-start;gap:11px;margin-bottom:12px}
.footer-brand strong{color:#fff;font-size:18px}
.footer-brand p{margin-top:3px}
.research-note{padding:14px;background:rgba(255,255,255,.04);border:1px solid var(--line-ink);border-radius:var(--r-md);color:var(--on-ink-mut);line-height:1.6;font-size:12.5px}
.research-note strong{color:#fff}
.footer-bottom{margin-top:26px;padding-top:18px;border-top:1px solid var(--line-ink);display:flex;flex-wrap:wrap;gap:11px;justify-content:space-between;align-items:center}
.footer-author{font-size:13px;color:var(--on-ink-mut)}
.footer-author b{color:#fff;font-weight:700}
.made-with{display:inline-flex;align-items:center;gap:7px;font-family:var(--f-mono);font-size:12.5px;color:var(--on-ink-mut);font-weight:700}
.made-with .heart{color:var(--no);font-size:13px;display:inline-block;animation:heartbeat 1.5s ease-in-out infinite}
@keyframes heartbeat{0%,100%{transform:scale(1)}14%{transform:scale(1.25)}28%{transform:scale(1)}42%{transform:scale(1.25)}70%{transform:scale(1)}}

/* ---------- BOTTOM TAB BAR (mobile) ---------- */
.bottom-tab{position:fixed;left:0;right:0;bottom:0;z-index:60;display:none;grid-template-columns:repeat(5,1fr);background:var(--surface);border-top:1px solid var(--line);box-shadow:0 -8px 24px -14px rgba(15,26,54,.25);padding:6px 6px calc(6px + env(safe-area-inset-bottom))}
.bottom-tab a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;padding:6px 2px;border-radius:12px;color:var(--muted);font-size:10px;font-weight:700;transition:color .16s,background .16s}
.bottom-tab a i{font-size:17px;transition:transform .2s var(--ease-back)}
.bottom-tab a.is-active{color:var(--brand);background:var(--brand-soft)}
.bottom-tab a:active i{transform:scale(1.2)}

/* ---------- MODAL + TOAST ---------- */
.read-progress{position:fixed;top:0;left:0;height:3px;width:0%;background:var(--brand);z-index:80;border-radius:0 3px 3px 0;transition:width .12s linear}
.grm-modal-backdrop{position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;padding:20px;background:rgba(10,17,38,.5);backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px);opacity:0;visibility:hidden;transition:opacity .25s,visibility .25s}
.grm-modal-backdrop.show{opacity:1;visibility:visible}
.grm-modal{width:min(420px,100%);background:var(--surface);border-radius:22px;overflow:hidden;box-shadow:0 40px 80px -28px rgba(0,0,0,.5);transform:translateY(20px) scale(.94);opacity:0;transition:transform .4s var(--ease-back),opacity .25s;position:relative}
.grm-modal-backdrop.show .grm-modal{transform:translateY(0) scale(1);opacity:1}
.grm-modal-top{position:relative;padding:30px 26px 24px;text-align:center;color:#fff;overflow:hidden;background:linear-gradient(135deg,var(--brand),var(--brand-2))}
.grm-modal-emoji{font-size:34px;line-height:1;position:relative;z-index:1;display:inline-grid;place-items:center;width:64px;height:64px;border-radius:50%;background:rgba(255,255,255,.16);margin:0 auto}
.grm-modal-top h3{color:#fff;font-size:23px;margin:13px 0 0;position:relative;z-index:1}
.grm-modal-body{padding:22px 26px 26px;text-align:center}
.grm-modal-body p{color:var(--muted);line-height:1.65;font-size:14.5px;margin:0 0 13px}
.grm-modal-body p strong{color:var(--ink)}
.grm-feature-row{display:grid;grid-template-columns:repeat(3,1fr);gap:9px;margin:16px 0 20px}
.grm-feat{padding:13px 6px;border-radius:13px;background:var(--surface-2);border:1px solid var(--line-2)}
.grm-feat .gf-ico{font-size:19px;color:var(--brand)}
.grm-feat:nth-child(2) .gf-ico{color:var(--teal)}
.grm-feat:nth-child(3) .gf-ico{color:var(--amber)}
.grm-feat span{display:block;font-size:11px;font-weight:700;color:var(--ink-soft);margin-top:5px}
.grm-modal-body .btn{width:100%}
.grm-modal-close{position:absolute;top:13px;right:13px;z-index:2;width:32px;height:32px;border-radius:50%;border:0;background:rgba(255,255,255,.2);color:#fff;cursor:pointer;font-size:15px;display:grid;place-items:center;transition:background .18s,transform .18s}
.grm-modal-close:hover{background:rgba(255,255,255,.32);transform:rotate(90deg)}
.grm-toast-wrap{position:fixed;left:50%;transform:translateX(-50%);bottom:86px;z-index:95;display:flex;flex-direction:column;gap:9px;align-items:center;width:max-content;max-width:calc(100% - 32px);pointer-events:none}
.grm-toast{display:flex;align-items:center;gap:10px;padding:12px 17px;border-radius:var(--pill);background:var(--ink);color:#fff;box-shadow:0 20px 40px -16px rgba(0,0,0,.45);font-weight:700;font-size:14px;transform:translateY(16px);opacity:0;transition:transform .35s var(--ease-back),opacity .25s;pointer-events:auto;border:1px solid var(--line-ink)}
.grm-toast.show{transform:translateY(0);opacity:1}
.grm-toast .gt-ico{font-size:15px;color:#9DB0FF}
.grm-toast.ok{background:var(--ok)}.grm-toast.ok .gt-ico{color:#fff}
.grm-toast.brand{background:var(--brand)}.grm-toast.brand .gt-ico{color:#fff}
.confetti-piece{position:fixed;top:-12px;width:9px;height:13px;z-index:98;pointer-events:none;border-radius:2px;will-change:transform,opacity}

/* ---------- SCROLL REVEAL ---------- */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.reveal.is-in{opacity:1;transform:none}
.reveal-stagger>*{opacity:0;transform:translateY(18px);transition:opacity .55s var(--ease),transform .55s var(--ease)}
.reveal-stagger.is-in>*{opacity:1;transform:none}
.reveal-stagger.is-in>*:nth-child(1){transition-delay:.03s}
.reveal-stagger.is-in>*:nth-child(2){transition-delay:.09s}
.reveal-stagger.is-in>*:nth-child(3){transition-delay:.15s}
.reveal-stagger.is-in>*:nth-child(4){transition-delay:.21s}
.reveal-stagger.is-in>*:nth-child(5){transition-delay:.27s}
.reveal-stagger.is-in>*:nth-child(6){transition-delay:.33s}

/* ---------- RESPONSIVE ---------- */
@media (max-width:1024px){
  :root{--side-w:216px}
  .hero-grid,.grid-3,.grid-4,.lesson-layout,.footer-grid,.lessons-deck,.games-grid{grid-template-columns:1fr}
  .grid-2{grid-template-columns:1fr}
  .kpi-row{grid-template-columns:repeat(2,1fr)}
  .sidebar-card{position:static}
  .hero-side{max-width:440px}
}
@media (max-width:900px){
  .sidebar{display:none}
  .content{margin-left:0}
  .mobile-top{display:flex}
  .bottom-tab{display:grid}
  .topbar{display:none}
  main{padding-bottom:78px}
  .lessons-deck,.games-grid{grid-template-columns:1fr}
  .page-shell,.panel,.panel-ink,.white-panel,.game-stage,.lesson-content,.card,.form,.glass-card{padding:20px;border-radius:var(--r-lg)}
  .lesson-content{padding:22px 20px;font-size:15.5px;overflow-wrap:anywhere;word-break:break-word}
  .kpi-row{grid-template-columns:1fr 1fr}
  .spotlight-row{grid-template-columns:1fr}
  .spot-arrow{transform:rotate(90deg);margin:0 auto}
  .grm-toast-wrap{bottom:82px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}
@media (max-width:520px){
  :root{--container:min(1080px,calc(100% - 28px))}
  .hero-title{font-size:clamp(26px,8vw,34px)}
  .section-title{font-size:23px}
  .hero-mini-stats{grid-template-columns:1fr 1fr 1fr;gap:7px}
  .stat-tile{padding:11px 9px}.stat-tile strong{font-size:21px}
  .kpi-row,.mock-footer{grid-template-columns:1fr 1fr}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
  .reveal,.reveal-stagger>*{opacity:1!important;transform:none!important}
}
:focus-visible{outline:3px solid var(--brand);outline-offset:2px;border-radius:6px}

/* ---------- PRINT (PDF DOWNLOAD) ---------- */
@media print{
  @page{size:A4;margin:14mm}
  body{background:#fff!important}
  .sidebar,.mobile-top,.bottom-tab,.topbar,.site-footer,.no-print,.grm-toast-wrap,.read-progress,.grm-modal-backdrop,.page-head,.sidebar-card{display:none!important}
  .content{margin-left:0!important}
  main{padding:0!important}
  .container{width:100%!important}
  .lesson-layout,.grid-2,.grid-3{display:block!important}
  .print-doc{box-shadow:none!important;border:0!important;padding:0!important}
  .print-head{display:block!important;border-bottom:2px solid #3457D5;padding-bottom:10px;margin-bottom:16px}
  .print-head .ph-brand{font-family:"Space Mono",monospace;font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:#3457D5;font-weight:700}
  .print-head h1{font-size:22px;margin:6px 0 4px;color:#0F1A36}
  .print-head .ph-meta{font-size:11px;color:#5b6b7e}
  .card,.panel,.lesson-content,.side-box,.page-shell{box-shadow:none!important;border:1px solid #d8def0!important;break-inside:avoid}
  .page-shell{background:#fff!important;color:#0F1A36!important}
  .page-shell h1,.page-head p{color:#0F1A36!important}
  .lesson-content code,.formula{background:#eef1fb!important;color:#27409E!important}
  .spotlight,.lesson-card,.question{break-inside:avoid}
  a[href]:after{content:""}
}
.print-head{display:none}

/* ===== INTERACTIVE LESSON & TEST COMPONENTS ===== */
.lesson-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:20px}
.stat-chip-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);padding:14px;box-shadow:var(--sh-xs);display:flex;align-items:center;gap:12px;transition:transform .2s var(--ease),box-shadow .2s}
.stat-chip-card:hover{transform:translateY(-2px);box-shadow:var(--sh-card)}
.stat-chip-card .sc-tile{width:40px;height:40px;border-radius:11px;display:grid;place-items:center;font-size:17px;flex:none}
.stat-chip-card .sc-val{font-size:20px;font-weight:800;color:var(--ink);line-height:1}
.stat-chip-card .sc-lab{font-size:11.5px;color:var(--muted);font-weight:600}

.reveal-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-card);overflow:hidden;margin-bottom:20px}
.reveal-card-top{padding:18px 20px;background:linear-gradient(135deg,rgba(229,72,77,.06),rgba(238,156,22,.05))}
.reveal-eyebrow{display:flex;align-items:center;gap:8px;font-family:var(--f-mono);font-size:10.5px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--amber);margin-bottom:12px}
.reveal-wrong{display:flex;align-items:center;gap:11px;font-size:18px;font-weight:700;color:#b3343a;background:var(--no-soft);border:1px solid #f5cdcf;border-radius:12px;padding:13px 16px}
.reveal-wrong i{color:var(--no);flex:none}
.reveal-wrong span{text-decoration:line-through;text-decoration-color:rgba(229,72,77,.45)}
.reveal-btn{margin-top:14px;display:inline-flex;align-items:center;gap:9px;background:var(--ink);color:#fff;border:0;border-radius:11px;padding:11px 18px;font-weight:700;font-size:14px;cursor:pointer;box-shadow:var(--sh-sm);transition:transform .15s var(--ease),background .2s}
.reveal-btn:hover{transform:translateY(-1px);background:var(--brand-deep)}
.reveal-answer{max-height:0;opacity:0;overflow:hidden;transition:max-height .5s var(--ease),opacity .4s,padding .4s}
.reveal-answer.show{max-height:260px;opacity:1}
.reveal-answer-inner{padding:0 20px 20px}
.reveal-right{display:flex;align-items:center;gap:11px;font-size:18px;font-weight:700;color:#0c7a4c;background:var(--ok-soft);border:1px solid #bce8d6;border-radius:12px;padding:13px 16px;animation:pop-in .4s var(--ease-back)}
.reveal-right i{color:var(--ok);flex:none}
.reveal-note{margin-top:11px;font-size:13.5px;color:var(--muted);line-height:1.55}
.reveal-note b{color:var(--ink-soft)}

.lesson-toc{position:sticky;top:16px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-card);padding:16px;margin-bottom:14px}
.lesson-toc h4{font-size:12px;font-family:var(--f-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:0 0 10px;display:flex;align-items:center;gap:7px}
.lesson-toc h4 i{color:var(--brand)}
.toc-list{display:flex;flex-direction:column;gap:2px}
.toc-link{display:flex;align-items:center;gap:9px;padding:7px 10px;border-radius:9px;font-size:13px;font-weight:600;color:var(--ink-soft);cursor:pointer;border-left:2px solid transparent;transition:background .15s,color .15s,border-color .15s}
.toc-link.sub{padding-left:22px;font-size:12.5px;font-weight:500;color:var(--muted)}
.toc-link .toc-dot{width:6px;height:6px;border-radius:50%;background:var(--line-2);flex:none;transition:background .15s}
.toc-link:hover{background:var(--surface-2);color:var(--ink)}
.toc-link.active{background:var(--brand-soft);color:var(--brand-deep);border-left-color:var(--brand)}
.toc-link.active .toc-dot{background:var(--brand)}

.quiz-inline{background:var(--ink);color:var(--on-ink);border:1px solid var(--line-ink);border-radius:var(--r-xl);box-shadow:var(--sh-lift);padding:24px;margin-top:24px;position:relative;overflow:hidden}
.quiz-inline::before{content:"";position:absolute;top:-30%;right:-5%;width:32%;height:80%;background:radial-gradient(circle,rgba(14,159,184,.16),transparent 64%)}
.quiz-inline>*{position:relative;z-index:1}
.qi-head{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:center;margin-bottom:8px}
.qi-head h3{color:#fff;font-size:20px;margin:0;display:flex;align-items:center;gap:9px}
.qi-head h3 i{color:#5BD6C0}
.qi-sub{color:var(--on-ink-mut);font-size:13px;font-family:var(--f-mono)}
.qi-progress-bar{height:6px;border-radius:99px;background:rgba(255,255,255,.1);margin:14px 0 18px;overflow:hidden}
.qi-progress-fill{height:100%;width:0;border-radius:99px;background:linear-gradient(90deg,var(--teal),#5BD6C0);transition:width .5s var(--ease)}
.qi-card{display:none}
.qi-card.active{display:block;animation:pop-in .35s var(--ease-back)}
.qi-q{font-size:18px;font-weight:700;color:#fff;line-height:1.35;margin-bottom:14px}
.qi-q .qi-num{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:8px;background:var(--teal);color:#fff;font-size:13px;font-weight:800;margin-right:9px;font-family:var(--f-mono)}
.qi-opts{display:grid;gap:10px}
.qi-opt{display:flex;align-items:center;gap:12px;text-align:left;width:100%;border:1.5px solid var(--line-ink);background:rgba(255,255,255,.05);color:#fff;border-radius:12px;padding:13px 15px;cursor:pointer;font-weight:600;font-size:15px;transition:transform .14s,background .18s,border-color .18s}
.qi-opt .qi-key{width:27px;height:27px;flex:none;border-radius:8px;display:grid;place-items:center;background:rgba(255,255,255,.1);font-family:var(--f-mono);font-size:12px;font-weight:700;transition:.18s}
.qi-opt:hover:not(:disabled){background:rgba(255,255,255,.1);border-color:var(--teal);transform:translateX(2px)}
.qi-opt:disabled{cursor:default}
.qi-opt.correct{background:rgba(18,168,107,.2);border-color:var(--ok)}
.qi-opt.correct .qi-key{background:var(--ok)}
.qi-opt.wrong{background:rgba(229,72,77,.18);border-color:var(--no);animation:shake .4s}
.qi-opt.wrong .qi-key{background:var(--no)}
.qi-opt .qi-mark{margin-left:auto;font-size:15px;opacity:0;transition:opacity .2s}
.qi-opt.correct .qi-mark{opacity:1;color:#3BD68B}
.qi-opt.wrong .qi-mark{opacity:1;color:#FF8E91}
.qi-feedback{margin-top:14px;padding:13px 15px;border-radius:12px;font-size:14px;line-height:1.5;background:rgba(255,255,255,.05);border:1px solid var(--line-ink);color:var(--on-ink-mut);display:none}
.qi-feedback.show{display:block;animation:pop-in .3s var(--ease-back)}
.qi-feedback.ok{background:rgba(18,168,107,.12);border-color:rgba(18,168,107,.3);color:#cdeede}
.qi-feedback strong{color:#fff}
.qi-next{margin-top:16px;display:none}
.qi-next.show{display:inline-flex}
.qi-done{display:none;text-align:center;padding:14px 0 4px}
.qi-done.show{display:block;animation:pop-in .4s var(--ease-back)}
.qi-done .qi-ico{font-size:46px;color:#FFC25A;margin-bottom:8px;animation:bounce-in .6s var(--ease-back)}
.qi-done .qi-score{font-size:44px;font-weight:800;color:#fff;line-height:1}
.qi-done .qi-score small{font-size:19px;color:var(--on-ink-mut)}
.qi-done h3{color:#fff;font-size:21px;margin:6px 0}
.qi-done p{color:var(--on-ink-mut);font-size:14px;margin:4px 0 0}

/* interactive test runner (take-test) */
.test-progress{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line);padding:12px 0;margin-bottom:18px}
.test-progress-inner{display:flex;align-items:center;gap:14px}
.test-progress-bar{flex:1;height:8px;border-radius:99px;background:var(--surface-2);overflow:hidden}
.test-progress-fill{height:100%;width:0;border-radius:99px;background:linear-gradient(90deg,var(--brand),var(--teal));transition:width .4s var(--ease)}
.test-progress-count{font-family:var(--f-mono);font-weight:700;font-size:13px;color:var(--ink-soft);white-space:nowrap}
.tq-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-card);padding:22px;margin-bottom:16px;border-left:4px solid var(--line-2);transition:border-color .25s,box-shadow .25s}
.tq-card.answered{border-left-color:var(--ok)}
.tq-q{font-weight:800;color:var(--ink);font-size:17px;line-height:1.4;margin-bottom:14px;display:flex;gap:11px}
.tq-q .tq-num{flex:none;display:inline-grid;place-items:center;width:30px;height:30px;border-radius:9px;background:var(--brand-soft);color:var(--brand-deep);font-size:14px;font-weight:800;font-family:var(--f-mono)}
.tq-card.answered .tq-q .tq-num{background:var(--ok-soft);color:#0c7a4c}
.tq-opt{display:flex;align-items:center;gap:12px;padding:13px 15px;border-radius:11px;background:var(--surface);border:1.5px solid var(--line-2);margin:9px 0;cursor:pointer;transition:border-color .15s,background .15s,transform .12s}
.tq-opt:hover{border-color:var(--brand);background:var(--brand-soft);transform:translateX(2px)}
.tq-opt input{position:absolute;opacity:0;width:0;height:0}
.tq-opt .tq-key{width:27px;height:27px;flex:none;border-radius:8px;display:grid;place-items:center;background:var(--surface-2);font-family:var(--f-mono);font-size:12px;font-weight:700;color:var(--muted);border:1px solid var(--line-2);transition:.15s}
.tq-opt.selected{border-color:var(--brand);background:var(--brand-soft)}
.tq-opt.selected .tq-key{background:var(--brand);color:#fff;border-color:var(--brand)}
.test-submit-bar{position:sticky;bottom:0;background:var(--surface);border-top:1px solid var(--line);box-shadow:0 -8px 24px -14px rgba(15,26,54,.2);padding:14px 0;margin-top:8px}
.test-submit-inner{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between}
@media (max-width:900px){
  .lesson-stats{grid-template-columns:1fr 1fr}
  .test-submit-bar{bottom:64px}
  .reveal-wrong,.reveal-right{font-size:16px}
}
@media print{ .quiz-inline,.reveal-card,.lesson-stats,.lesson-toc,.test-progress,.test-submit-bar{display:none!important} }