:root{
  --bg:#f6efe6;
  --ink:#221a14;
  --muted:#8a7a6b;
  --card:#fffdf8;
  --accent:#c73e3a;
  --accent-dark:#9c2b28;
  --gold:#c9a24b;
  --shadow:0 10px 30px rgba(34,26,20,.12);
  --radius:18px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family: ui-serif, Georgia, "Times New Roman", serif;
  background:
    radial-gradient(1200px 600px at 20% -10%, #fff 0%, transparent 60%),
    radial-gradient(900px 500px at 90% 10%, #f3d9c8 0%, transparent 55%),
    var(--bg);
  color:var(--ink);
  min-height:100vh;
  padding-bottom:90px;
}

/* Topbar */
.topbar{
  position:sticky;top:0;z-index:20;
  display:flex;align-items:center;gap:16px;
  padding:14px 20px;
  background:rgba(246,239,230,.85);
  backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(34,26,20,.08);
}
.brand{font-weight:900;font-size:22px;letter-spacing:-.5px;white-space:nowrap}
.brand span{font-style:italic;font-weight:400;color:var(--accent)}
.progress-wrap{flex:1;max-width:520px;margin:0 auto}
.progress-text{font-family:ui-monospace,Menlo,monospace;font-size:13px;margin-bottom:6px}
.progress-bar{height:8px;background:rgba(34,26,20,.1);border-radius:99px;overflow:hidden}
#progressFill{height:100%;width:0%;background:linear-gradient(90deg,var(--accent),var(--gold));border-radius:99px;transition:width .4s ease}
.top-actions{display:flex;gap:8px}
.ghost-btn{
  font-family:ui-monospace,Menlo,monospace;font-size:12px;
  border:1px solid rgba(34,26,20,.2);background:transparent;border-radius:99px;
  padding:7px 12px;cursor:pointer;color:var(--ink);
}
.ghost-btn:hover{background:var(--ink);color:#fff}

/* Filters + tagline */
.filters{display:flex;gap:8px;justify-content:center;padding:18px 16px 6px;flex-wrap:wrap}
.filter{
  font-family:ui-monospace,Menlo,monospace;font-size:12px;
  border:1px solid rgba(34,26,20,.15);background:var(--card);
  padding:7px 14px;border-radius:99px;cursor:pointer;
}
.filter.active{background:var(--ink);color:#fff;border-color:var(--ink)}
.tagline{text-align:center;color:var(--muted);font-style:italic;margin:8px 16px 18px;font-size:15px}

/* Grid */
.grid{
  display:grid;gap:14px;padding:0 20px;max-width:1200px;margin:0 auto;
  grid-template-columns:repeat(auto-fill,minmax(210px,1fr));
}
.card{
  perspective:800px;cursor:pointer;min-height:170px;
}
.card-inner{
  position:relative;width:100%;height:100%;min-height:170px;
  transform-style:preserve-3d;transition:transform .6s cubic-bezier(.2,.7,.3,1.2);
}
.card.found .card-inner{transform:rotateY(180deg)}
.card-face{
  position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;
  border-radius:var(--radius);padding:16px;
  display:flex;flex-direction:column;justify-content:space-between;
  box-shadow:var(--shadow);border:1px solid rgba(34,26,20,.08);
}
.card-front{background:var(--card)}
.card-front .num{font-family:ui-monospace,Menlo,monospace;font-size:12px;color:var(--muted)}
.card-front .q{font-size:28px;line-height:1}
.card-front .cta{font-family:ui-monospace,Menlo,monospace;font-size:12px;color:var(--accent)}
.card-front .tag{font-size:11px;font-family:ui-monospace,Menlo,monospace;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}
.card-back{background:var(--ink);color:#fdf8ef;transform:rotateY(180deg)}
.card-back .rnum{font-family:ui-monospace,Menlo,monospace;font-size:11px;color:var(--gold)}
.card-back .rtext{font-size:17px;line-height:1.4;margin:8px 0 0}
.card-back .mood{font-family:ui-monospace,Menlo,monospace;font-size:11px;opacity:.7}
.card.finale-card .card-front{border:2px dashed var(--accent)}
.card.finale-card .card-back{background:linear-gradient(135deg,#221a14,#5b2321);border:1px solid var(--gold)}
.card.locked{opacity:.75;cursor:not-allowed}
.card.hidden-filter{display:none}

/* Finale */
.finale{max-width:760px;margin:60px auto 0;padding:0 20px}
.finale.hidden{display:none}
.finale-card{
  background:var(--ink);color:#fdf8ef;border-radius:24px;padding:40px 32px;text-align:center;
  box-shadow:var(--shadow);border:1px solid var(--gold);
  animation:pop .6s ease;
}
.finale-label{font-family:ui-monospace,Menlo,monospace;font-size:12px;color:var(--gold);letter-spacing:.1em;text-transform:uppercase}
.finale-card h2{font-size:clamp(26px,5vw,42px);line-height:1.15;margin:16px 0}
.finale-card h2 em{color:#f3d9c8}
.finale-card p{color:#d8cbbd;font-style:italic}
@keyframes pop{from{transform:scale(.96) translateY(10px);opacity:0}to{transform:scale(1) translateY(0);opacity:1}}

/* Buttons */
.primary-btn{
  font-family:ui-monospace,Menlo,monospace;font-size:15px;
  background:var(--accent);color:#fff;border:none;border-radius:99px;
  padding:14px 28px;cursor:pointer;box-shadow:0 8px 24px rgba(199,62,58,.35);
  transition:transform .15s ease;
}
.primary-btn:hover{background:var(--accent-dark);transform:translateY(-1px)}

/* Overlay / Envelope */
.overlay{
  position:fixed;inset:0;z-index:50;
  background:radial-gradient(800px 500px at 50% 30%, #fff 0%, #f6efe6 60%, #e9dccb 100%);
  display:flex;align-items:center;justify-content:center;padding:24px;
  transition:opacity .6s ease, visibility .6s;
}
.overlay.opened{opacity:0;visibility:hidden;pointer-events:none}
.envelope-scene{text-align:center;max-width:560px;width:100%}
.envelope{
  position:relative;width:min(420px,86vw);height:280px;margin:0 auto 28px;
}
.envelope-back{
  position:absolute;inset:0;background:#d9c3a5;border-radius:16px;
  box-shadow:var(--shadow);
}
.letter{
  position:absolute;left:14px;right:14px;top:14px;bottom:14px;
  background:#fffdf8;border-radius:12px;padding:24px 20px;
  display:flex;flex-direction:column;justify-content:center;gap:10px;
  transition:transform .8s ease;z-index:2;
  box-shadow:0 4px 16px rgba(0,0,0,.08);
  border:1px solid rgba(0,0,0,.06);
}
.letter-small{font-family:ui-monospace,Menlo,monospace;font-size:11px;text-transform:uppercase;letter-spacing:.2em;color:var(--muted);margin:0}
.letter-big{font-size:20px;line-height:1.5;margin:0}
.letter-tiny{font-size:13px;color:var(--muted);font-style:italic;margin:0}
.envelope-front{
  position:absolute;inset:0;z-index:3;
  background:linear-gradient(135deg,#e8d5b7,#d9be94);
  border-radius:16px;
  clip-path:polygon(0 35%, 50% 62%, 100% 35%, 100% 100%, 0 100%);
  border:1px solid rgba(0,0,0,.08);
}
.envelope-flap{
  position:absolute;left:0;right:0;top:0;height:55%;z-index:4;
  background:linear-gradient(180deg,#cbb086,#b8976c);
  clip-path:polygon(0 0, 100% 0, 50% 100%);
  border-radius:16px 16px 0 0;
  transform-origin:top center;transition:transform .8s ease;transition-delay:.1s;
}
.envelope.open .envelope-flap{transform:rotateX(180deg);z-index:1}
.envelope.open .letter{transform:translateY(-110px);z-index:5}
.wax{
  position:absolute;left:50%;top:46%;transform:translate(-50%,-50%);
  z-index:6;width:84px;height:84px;border-radius:50%;
  background:radial-gradient(circle at 30% 30%, #e0605c, var(--accent) 55%, var(--accent-dark));
  color:#ffe9c9;font-family:ui-serif,Georgia,serif;font-weight:900;font-size:24px;
  border:3px solid #a33;border:none;cursor:pointer;
  box-shadow:0 6px 18px rgba(156,43,40,.45), inset 0 2px 6px rgba(255,255,255,.4);
}
.title{font-size:clamp(28px,6vw,44px);letter-spacing:-1px;margin:10px 0 16px;line-height:1.05}
.title span{display:block;font-weight:400;font-style:italic;font-size:.6em;color:var(--muted)}
.hint{font-family:ui-monospace,Menlo,monospace;font-size:12px;color:var(--muted);margin-top:14px}

#confetti{position:fixed;inset:0;pointer-events:none;z-index:60}

/* Credit */
.credit{
  position:fixed;right:14px;bottom:12px;z-index:30;
  font-family:ui-monospace,Menlo,monospace;font-size:12px;
  color:var(--muted);text-decoration:none;
  background:rgba(255,253,248,.8);border:1px solid rgba(0,0,0,.08);
  padding:6px 10px;border-radius:99px;backdrop-filter:blur(6px);
}
.credit:hover{color:var(--ink);border-color:var(--ink)}

@media(max-width:600px){
  .topbar{flex-wrap:wrap}
  .progress-wrap{order:3;flex-basis:100%;max-width:none}
}