:root{
  --ink:#20241f; --paper:#f3ede1; --paper-dim:#e9e0cf;
  --stamp-green:#3e6b52; --stamp-green-dark:#2b4d3a;
  --stamp-gold:#b8863b; --stamp-rust:#a8452f;
  --line:#c9bda2; --white:#fffdf8;
}
*{box-sizing:border-box;}
body{
  margin:0; background:var(--paper);
  background-image:radial-gradient(circle at 1px 1px, rgba(32,36,31,0.06) 1px, transparent 0);
  background-size:22px 22px; color:var(--ink);
  font-family:'Source Sans 3', sans-serif; min-height:100vh;
}
.wrap{max-width:920px;margin:0 auto;padding:32px 20px 80px;}

.app-header{display:flex;align-items:baseline;justify-content:space-between;border-bottom:3px solid var(--ink);padding-bottom:16px;margin-bottom:24px;flex-wrap:wrap;gap:10px;}
.app-header h1{font-family:'Fraunces', serif;font-weight:700;font-size:clamp(28px,5vw,42px);margin:0;letter-spacing:-0.01em;}
.app-header h1 span{color:var(--stamp-rust);}
.app-header .sub{font-family:'JetBrains Mono', monospace;font-size:13px;color:var(--stamp-green-dark);text-transform:uppercase;letter-spacing:0.08em;}
.sync-badge{font-family:'JetBrains Mono', monospace;font-size:12px;background:var(--white);border:2px solid var(--ink);border-radius:5px;padding:6px 12px;cursor:pointer;}

/* Login gate */
#gate{max-width:420px;margin:80px auto;background:var(--white);border:2px solid var(--ink);border-radius:8px;padding:32px;box-shadow:5px 5px 0 var(--line);text-align:center;}
#gate h2{font-family:'Fraunces', serif;font-size:24px;margin-top:0;}
#gate p{font-size:14px;color:#5c5647;}
#gate input{
  width:100%;font-family:'JetBrains Mono', monospace;font-size:22px;letter-spacing:.1em;
  text-align:center;padding:12px;border:2px solid var(--ink);border-radius:5px;margin:12px 0;
}
#gate button{width:100%;font-family:'JetBrains Mono', monospace;font-size:14px;padding:12px;border:2px solid var(--ink);border-radius:5px;background:var(--stamp-green);color:var(--white);cursor:pointer;margin-top:6px;}
#gate button.secondary{background:transparent;color:var(--ink);}
#gate .divider{margin:20px 0;font-size:12px;color:#a89f8a;font-family:'JetBrains Mono', monospace;}

.hidden-block{display:none;max-width:420px;margin:80px auto;background:var(--white);border:2px solid var(--ink);border-radius:8px;padding:32px;box-shadow:5px 5px 0 var(--line);text-align:center;}
.hidden-block h2{font-family:'Fraunces', serif;}
.hidden-block .small-note{font-size:13px;color:#5c5647;}
.hidden-block button{width:100%;font-family:'JetBrains Mono', monospace;font-size:14px;padding:12px;border:2px solid var(--ink);border-radius:5px;background:var(--stamp-green);color:var(--white);cursor:pointer;}
.your-code{font-family:'JetBrains Mono', monospace;font-size:32px;letter-spacing:.15em;background:var(--paper-dim);border-radius:5px;padding:10px;margin:12px 0;}

#app{display:none;}

nav.tabs{display:flex;gap:10px;margin-bottom:28px;flex-wrap:wrap;}
nav.tabs button{font-family:'JetBrains Mono', monospace;font-size:13px;letter-spacing:0.04em;text-transform:uppercase;background:transparent;border:2px solid var(--ink);color:var(--ink);padding:9px 16px;cursor:pointer;border-radius:3px;transition:all .15s ease;}
nav.tabs button:hover{background:var(--ink);color:var(--paper);}
nav.tabs button.active{background:var(--stamp-green);border-color:var(--stamp-green-dark);color:var(--white);}

section{display:none;} section.active{display:block;animation:fade .25s ease;}
@keyframes fade{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}

.group-header{display:flex;align-items:center;gap:12px;margin:36px 0 14px;}
.group-header .badge{font-family:'JetBrains Mono', monospace;font-size:11px;background:var(--ink);color:var(--paper);padding:3px 9px;border-radius:2px;letter-spacing:.05em;}
.group-header h2{font-family:'Fraunces', serif;font-weight:600;font-size:20px;margin:0;}
.group-header p{margin:0;font-size:13px;color:#5c5647;}
.group-header.familiar .badge{background:var(--stamp-green-dark);}
.group-header.false .badge{background:var(--stamp-rust);}
.group-header.new .badge{background:var(--stamp-gold);}

.letter-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:12px;}
.letter-card{background:var(--white);border:2px solid var(--ink);border-radius:6px;padding:14px 10px;text-align:center;cursor:pointer;position:relative;transition:transform .12s ease, box-shadow .12s ease;box-shadow:3px 3px 0 var(--line);}
.letter-card:hover{transform:translate(-2px,-2px);box-shadow:5px 5px 0 var(--line);}
.letter-card .glyph{font-family:'Fraunces', serif;font-size:40px;font-weight:600;line-height:1;}
.letter-card .sound{font-family:'JetBrains Mono', monospace;font-size:12px;color:var(--stamp-green-dark);margin-top:6px;min-height:16px;}
.letter-card .example{font-size:11px;color:#7a7360;margin-top:4px;min-height:14px;}
.letter-card.revealed .sound, .letter-card.revealed .example{visibility:visible;}
.letter-card:not(.revealed) .sound, .letter-card:not(.revealed) .example{visibility:hidden;}
.letter-card::after{content:"tap to reveal";display:block;font-size:9px;color:#a89f8a;margin-top:2px;font-family:'JetBrains Mono', monospace;}
.letter-card.revealed::after{content:"";}
.speak-btn{position:absolute;top:6px;right:6px;background:none;border:none;font-size:16px;cursor:pointer;opacity:.6;}
.speak-btn:hover{opacity:1;}
.letter-card.mastered{border-color:var(--stamp-green-dark);background:#eef5ef;}
.letter-card.mastered .glyph::after{content:" ✓";font-size:16px;color:var(--stamp-green-dark);}

.quiz-box{background:var(--white);border:2px solid var(--ink);border-radius:8px;padding:36px 28px;max-width:520px;margin:20px auto 0;text-align:center;box-shadow:5px 5px 0 var(--line);}
.quiz-box .glyph-big{font-family:'Fraunces', serif;font-size:96px;font-weight:700;line-height:1;cursor:pointer;}
.quiz-box .prompt{font-family:'JetBrains Mono', monospace;font-size:12px;text-transform:uppercase;color:var(--stamp-green-dark);letter-spacing:.08em;margin-bottom:6px;}
.quiz-box .hint{font-size:11px;color:#a89f8a;margin-top:6px;}
.options{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:24px;}
.options button{font-family:'JetBrains Mono', monospace;font-size:16px;padding:14px;border:2px solid var(--ink);border-radius:5px;background:var(--paper);cursor:pointer;transition:all .12s ease;}
.options button:hover{background:var(--ink);color:var(--paper);}
.options button.correct{background:var(--stamp-green);border-color:var(--stamp-green-dark);color:var(--white);}
.options button.wrong{background:var(--stamp-rust);border-color:#7a2f1e;color:var(--white);}
.quiz-stats{display:flex;justify-content:space-between;font-family:'JetBrains Mono', monospace;font-size:12px;color:#5c5647;max-width:520px;margin:14px auto 0;}
.next-btn{margin-top:20px;font-family:'JetBrains Mono', monospace;font-size:13px;background:var(--stamp-gold);border:2px solid #8a621f;color:var(--white);padding:10px 22px;border-radius:5px;cursor:pointer;display:none;}

.word-list{display:flex;flex-direction:column;gap:10px;max-width:600px;}
.word-row{background:var(--white);border:2px solid var(--ink);border-radius:6px;padding:14px 18px;display:flex;justify-content:space-between;align-items:center;cursor:pointer;gap:12px;}
.word-row .bg{font-family:'Fraunces', serif;font-size:26px;font-weight:600;}
.word-row .meta{font-family:'JetBrains Mono', monospace;font-size:12px;color:#7a7360;text-align:right;visibility:hidden;}
.word-row.revealed .meta{visibility:visible;}

.progress-bar{background:var(--paper-dim);border:2px solid var(--ink);border-radius:6px;height:14px;overflow:hidden;max-width:400px;margin:8px 0 24px;}
.progress-bar-fill{background:var(--stamp-green);height:100%;transition:width .3s ease;}
.progress-label{font-family:'JetBrains Mono', monospace;font-size:12px;color:#5c5647;}

.app-footer{margin-top:60px;padding-top:16px;border-top:1px solid var(--line);font-family:'JetBrains Mono', monospace;font-size:11px;color:#a89f8a;text-align:center;}

.insight-message{background:var(--white);border:2px solid var(--stamp-green-dark);border-radius:8px;padding:16px 20px;margin:16px 0 24px;font-family:'JetBrains Mono', monospace;font-size:14px;color:var(--stamp-green-dark);}
.insight-columns{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
.insight-col h3{font-family:'Fraunces', serif;font-size:16px;margin:0 0 10px;}
.insight-list{display:flex;flex-direction:column;gap:8px;}
.insight-row{background:var(--white);border:2px solid var(--ink);border-radius:6px;padding:10px 14px;display:flex;justify-content:space-between;align-items:center;font-family:'JetBrains Mono', monospace;font-size:13px;}
.insight-row .letter{font-family:'Fraunces', serif;font-size:20px;font-weight:700;}
.insight-empty{font-size:13px;color:#a89f8a;font-family:'JetBrains Mono', monospace;}

/* Site banner (photo + tagline) */
.site-banner{
  display:flex;align-items:center;gap:12px;
  max-width:920px;margin:0 auto;padding:14px 20px 0;
}
.site-banner-photo{
  width:44px;height:44px;border-radius:50%;object-fit:cover;
  border:2px solid var(--ink);flex-shrink:0;
}
.site-banner-text{min-width:0;}
.site-banner-title{
  font-family:'Fraunces', serif;font-weight:700;font-size:15px;
  line-height:1.2;
}
.site-banner-tagline{
  font-family:'JetBrains Mono', monospace;font-size:11px;
  color:var(--stamp-green-dark);letter-spacing:.02em;
}
.site-banner-quote{
  font-size:11px;color:#7a7360;font-style:italic;margin-top:2px;
}
@media (max-width:480px){
  .site-banner{gap:10px;padding:12px 16px 0;}
  .site-banner-photo{width:36px;height:36px;}
  .site-banner-title{font-size:14px;}
  .site-banner-tagline{font-size:10px;}
  .site-banner-quote{font-size:10px;}
}

/* Signs tab */
.sign-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:14px;}
.sign-card{
  color:#fff;border:2px solid rgba(0,0,0,.25);border-radius:8px;
  padding:18px 14px 14px;text-align:center;cursor:pointer;position:relative;
  box-shadow:3px 3px 0 rgba(0,0,0,.18), inset 0 1px 0 rgba(255,255,255,.15);
  transition:transform .12s ease, box-shadow .12s ease;
  overflow:hidden;
}
.sign-card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:4px;
  background:rgba(255,255,255,.35);
}
.sign-card:hover{transform:translate(-2px,-2px);box-shadow:5px 5px 0 rgba(0,0,0,.22), inset 0 1px 0 rgba(255,255,255,.15);}
.sign-card .bg{
  font-family:'JetBrains Mono', monospace;font-weight:700;font-size:15px;
  letter-spacing:.03em;line-height:1.3;text-shadow:0 1px 2px rgba(0,0,0,.25);
}
.sign-card .meaning{
  font-size:11px;color:rgba(255,255,255,.85);margin-top:8px;min-height:14px;
  text-transform:capitalize;
}
.sign-card .ipa{
  font-family:'JetBrains Mono', monospace;font-size:10px;color:rgba(255,255,255,.65);
  margin-top:2px;min-height:12px;
}
.sign-card:not(.revealed) .meaning, .sign-card:not(.revealed) .ipa{visibility:hidden;}
.sign-card.revealed .meaning, .sign-card.revealed .ipa{visibility:visible;}
.sign-card::after{
  content:"tap to reveal";display:block;font-size:9px;color:rgba(255,255,255,.5);
  margin-top:8px;font-family:'JetBrains Mono', monospace;
}
.sign-card.revealed::after{content:"";}
.sign-card.mastered{box-shadow:3px 3px 0 var(--stamp-gold), inset 0 1px 0 rgba(255,255,255,.15);border-color:var(--stamp-gold);}
.sign-card.mastered .bg::after{content:" ✓";color:#ffe9a8;}
.sign-card .speak-btn{position:absolute;top:8px;right:8px;background:rgba(0,0,0,.2);border:none;border-radius:50%;width:24px;height:24px;font-size:12px;cursor:pointer;opacity:.85;}
.sign-card .speak-btn:hover{opacity:1;background:rgba(0,0,0,.35);}