/* ===========================================================
   Deutsch A1 — Bauhaus-inspired design system
   Signature: primary-color geometric shapes (circle/square/triangle)
   mark exercise types, echoing Bauhaus color theory (Kandinsky):
   red=square, yellow=triangle, blue=circle.
   =========================================================== */

@import url('https://fonts.googleapis.com/css2?family=Jost:wght@400;500;600;700&family=Source+Sans+3:wght@400;500;600&family=Space+Mono:wght@400;700&display=swap');

:root{
  --paper:#EDEAE1;
  --paper-2:#E3DFD3;
  --ink:#1B1B18;
  --ink-soft:#5B584F;
  --line:#CFC9B8;
  --navy:#16233D;
  --red:#D6412F;
  --yellow:#EBB512;
  --blue:#1E63A8;
  --green:#2E7D4F;
  --surface:#FBFAF6;
  --radius:2px;
  --shadow:0 2px 0 rgba(27,27,24,.9);
  --font-display:'Jost',sans-serif;
  --font-body:'Source Sans 3',sans-serif;
  --font-mono:'Space Mono',monospace;
}

[data-theme="dark"]{
  --paper:#14161B;
  --paper-2:#1B1E24;
  --ink:#ECE9DF;
  --ink-soft:#A7A398;
  --line:#33362E;
  --surface:#1C1F25;
  --shadow:0 2px 0 rgba(0,0,0,.9);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.55;
  transition:background .25s ease,color .25s ease;
}
img{max-width:100%}
a{color:inherit}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:600;margin:0 0 .5em;letter-spacing:.01em}
p{margin:0 0 1em}
button{font-family:var(--font-body);cursor:pointer}
.mono{font-family:var(--font-mono)}

:focus-visible{outline:3px solid var(--blue);outline-offset:2px}

@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important;transition-duration:.001ms !important;}
}

/* ---------- layout shell ---------- */
.wrap{max-width:1040px;margin:0 auto;padding:0 20px}

header.site{
  position:sticky;top:0;z-index:50;
  background:var(--paper);
  border-bottom:3px solid var(--ink);
}
.site-bar{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 0;
}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.brand-mark{width:34px;height:34px;position:relative;flex:none}
.brand-mark svg{width:100%;height:100%;display:block}
.brand-text{font-family:var(--font-display);font-weight:700;font-size:1.25rem;letter-spacing:.01em}
.brand-text span{color:var(--red)}

.header-actions{display:flex;align-items:center;gap:10px}
.theme-toggle{
  border:2px solid var(--ink);background:var(--surface);color:var(--ink);
  border-radius:var(--radius);padding:8px 10px;display:flex;align-items:center;gap:6px;
  font-size:.85rem;font-family:var(--font-mono);
}
.theme-toggle:hover{background:var(--yellow)}

main{padding:36px 0 80px}

/* ---------- hero ---------- */
.hero{
  display:grid;grid-template-columns:1.2fr 1fr;gap:36px;align-items:center;
  padding:40px 0 56px;
  border-bottom:3px solid var(--ink);
}
@media (max-width:820px){.hero{grid-template-columns:1fr;padding-top:20px}}

.eyebrow{
  font-family:var(--font-mono);font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--red);margin-bottom:10px;display:inline-block;
}
.hero h1{font-size:clamp(2.1rem,4.4vw,3.4rem);line-height:1.04}
.hero p.lead{font-size:1.08rem;color:var(--ink-soft);max-width:46ch}
.hero-stats{display:flex;gap:24px;margin-top:22px;flex-wrap:wrap}
.hero-stat b{display:block;font-family:var(--font-display);font-size:1.7rem}
.hero-stat span{font-size:.8rem;color:var(--ink-soft)}

.hero-art{position:relative;height:280px}
.hero-art svg{width:100%;height:100%}

.btn{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--ink);color:var(--paper);
  border:2px solid var(--ink);border-radius:var(--radius);
  padding:12px 20px;font-weight:600;text-decoration:none;font-size:.95rem;
  box-shadow:var(--shadow);
  transition:transform .12s ease;
}
.btn:hover{transform:translate(-2px,-2px)}
.btn.ghost{background:transparent;color:var(--ink)}
.btn.red{background:var(--red);border-color:var(--red);color:#fff}
.btn.blue{background:var(--blue);border-color:var(--blue);color:#fff}
.btn:disabled{opacity:.4;cursor:not-allowed;transform:none}

/* ---------- progress bar ---------- */
.progress-track{
  height:10px;background:var(--paper-2);border:2px solid var(--ink);border-radius:99px;overflow:hidden;
}
.progress-fill{height:100%;background:var(--green);width:0%;transition:width .4s ease}

/* ---------- lesson grid ---------- */
.section-title{display:flex;align-items:baseline;gap:12px;margin:48px 0 18px}
.section-title h2{margin:0;font-size:1.5rem}
.section-title .count{font-family:var(--font-mono);color:var(--ink-soft);font-size:.85rem}

.lesson-grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px;
}
.lesson-card{
  position:relative;background:var(--surface);border:2px solid var(--ink);border-radius:var(--radius);
  padding:16px 16px 50px;text-decoration:none;color:var(--ink);min-height:130px;
  display:flex;flex-direction:column;justify-content:space-between;
  box-shadow:var(--shadow);transition:transform .12s ease;
}
.lesson-card:hover{transform:translate(-3px,-3px)}
.lesson-card .num{font-family:var(--font-mono);font-size:.78rem;color:var(--ink-soft)}
.lesson-card h3{font-size:1.02rem;margin:.3em 0 0}
.lesson-card .de{font-size:.82rem;color:var(--ink-soft);font-style:italic}
.lesson-card .badge{
  position:absolute;bottom:14px;left:16px;font-family:var(--font-mono);font-size:.72rem;
  padding:3px 8px;border-radius:99px;border:1.5px solid var(--ink);
}
.lesson-card.done{border-color:var(--green)}
.lesson-card.done .badge{background:var(--green);color:#fff;border-color:var(--green)}
.lesson-card .shape{position:absolute;top:14px;right:14px;width:16px;height:16px}

/* ---------- lesson page ---------- */
.lesson-head{border-bottom:3px solid var(--ink);padding-bottom:24px;margin-bottom:28px}
.lesson-head .num{font-family:var(--font-mono);color:var(--red);font-size:.9rem;letter-spacing:.08em}
.lesson-head h1{font-size:clamp(1.6rem,3.4vw,2.3rem);margin:.15em 0}
.lesson-head .de{color:var(--ink-soft);font-style:italic}

.card{
  background:var(--surface);border:2px solid var(--ink);border-radius:var(--radius);
  padding:22px;margin-bottom:22px;box-shadow:var(--shadow);
}
.card h2{
  font-size:1.15rem;display:flex;align-items:center;gap:10px;margin-bottom:14px;
}
.card h2 .shape{width:18px;height:18px;flex:none}

.explain{font-size:1.02rem}
.explain b{color:var(--red)}

/* vocab flashcards */
.flash-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}
.flash{
  perspective:800px;height:96px;cursor:pointer;
}
.flash-inner{
  position:relative;width:100%;height:100%;transition:transform .5s;transform-style:preserve-3d;
}
.flash.flipped .flash-inner{transform:rotateY(180deg)}
.flash-face{
  position:absolute;inset:0;backface-visibility:hidden;border:2px solid var(--ink);border-radius:var(--radius);
  display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:8px;
  background:var(--paper-2);
}
.flash-face.back{transform:rotateY(180deg);background:var(--yellow);color:#1b1b18}
.flash-de{font-weight:600}
.flash-uz{font-size:.85rem;margin-top:4px}
.flash .audio-mini{position:absolute;top:4px;right:4px}

/* example sentences */
.sample{
  display:flex;justify-content:space-between;align-items:center;gap:14px;
  padding:12px 0;border-top:1px solid var(--line);
}
.sample:first-child{border-top:none}
.sample .de{font-weight:600}
.sample .uz{color:var(--ink-soft);font-size:.92rem}

.audio-btn{
  flex:none;width:38px;height:38px;border-radius:50%;border:2px solid var(--ink);
  background:var(--surface);display:flex;align-items:center;justify-content:center;
}
.audio-btn:hover{background:var(--blue);color:#fff;border-color:var(--blue)}
.audio-mini{width:26px;height:26px;border-radius:50%;border:2px solid var(--ink);background:var(--surface);
  display:flex;align-items:center;justify-content:center;font-size:.7rem}

/* quiz items */
.q-block{padding:16px 0;border-top:1px solid var(--line)}
.q-block:first-child{border-top:none}
.q-text{font-weight:600;margin-bottom:10px}
.options{display:grid;gap:8px}
.opt{
  text-align:left;padding:10px 14px;border:2px solid var(--ink);border-radius:var(--radius);
  background:var(--surface);font-size:.95rem;
}
.opt:hover{background:var(--paper-2)}
.opt.correct{background:var(--green);color:#fff;border-color:var(--green)}
.opt.wrong{background:var(--red);color:#fff;border-color:var(--red)}
.opt.disabled{pointer-events:none}
.fb{font-size:.85rem;margin-top:6px;font-family:var(--font-mono)}

/* word order */
.word-bank{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:10px}
.word-chip{
  padding:8px 12px;border:2px solid var(--ink);border-radius:99px;background:var(--paper-2);font-size:.92rem;
}
.word-chip.used{opacity:.35;pointer-events:none}
.word-answer{
  min-height:46px;border:2px dashed var(--line);border-radius:var(--radius);
  display:flex;flex-wrap:wrap;gap:8px;padding:8px;margin-bottom:10px;align-items:center;
}
.word-answer .word-chip{background:var(--blue);color:#fff;border-color:var(--blue)}

/* nav */
.lesson-nav{display:flex;justify-content:space-between;gap:12px;margin-top:30px}

/* final test */
.result-box{
  text-align:center;padding:40px 24px;border:3px solid var(--ink);border-radius:var(--radius);
  background:var(--surface);box-shadow:var(--shadow);
}
.result-box .score{font-family:var(--font-display);font-size:3.4rem}
.result-box .verdict{font-size:1.1rem;margin-top:6px}

footer.site{
  border-top:3px solid var(--ink);padding:26px 0;margin-top:40px;
  font-family:var(--font-mono);font-size:.82rem;color:var(--ink-soft);
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;
}

.shape-circle{border-radius:50%;background:var(--blue)}
.shape-square{background:var(--red)}
.shape-triangle{width:0;height:0;border-left:9px solid transparent;border-right:9px solid transparent;border-bottom:16px solid var(--yellow)}

@media (max-width:600px){
  .wrap{padding:0 16px}
  .site-bar{flex-wrap:wrap;gap:10px}
  header.site .btn{padding:10px 14px;font-size:.88rem}
}