:root{
  --bg1:#f8fafc; --bg2:#eef2ff; --ink:#0f172a; --muted:#475569; --brand:#6366f1; --brand2:#22d3ee; --card:#ffffff; --border:#e2e8f0;
  --shadow:0 20px 60px rgba(99,102,241,.18);
}
*{box-sizing:border-box} html,body{height:100%}
body{margin:0;font-family:Inter,system-ui,Segoe UI,Roboto,Arial,sans-serif;background:linear-gradient(120deg,var(--bg1), var(--bg2));color:var(--ink)}
a{color:var(--brand)}
.landing .hero{max-width:760px;margin:8vh auto;padding:36px;border:1px solid var(--border);border-radius:24px;background:var(--card);box-shadow:var(--shadow);text-align:center}
.logo{font-size:64px} h1{margin:10px 0 8px 0} .tag{color:var(--muted)}
.cta{display:flex;gap:10px;justify-content:center;margin-top:14px}
.btn{border:0;border-radius:12px;padding:12px 16px;font-weight:800;cursor:pointer}
.btn.primary{background:linear-gradient(135deg,var(--brand), var(--brand2));color:#00111e}
.btn.ghost{background:transparent;border:2px solid var(--brand);color:var(--brand)}

.container{max-width:1100px;margin:20px auto;padding:0 16px}
.topbar{display:flex;justify-content:space-between;align-items:center;margin:10px 0}
.controls{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.select,.btn-sm{padding:10px;border-radius:12px;border:1px solid var(--border);background:white}
.grid{display:grid;gap:10px;margin-top:10px}
.hud{display:flex;gap:12px;align-items:center;margin:6px 0;color:var(--muted);flex-wrap:wrap}
.badge{padding:6px 10px;border-radius:999px;background:#eef2ff;color:#1e3a8a;font-weight:800}

.card{position:relative;cursor:pointer;perspective:800px;width:100%;aspect-ratio:1;border-radius:16px}
.inner{position:absolute;inset:0;border-radius:16px;transition:transform .45s cubic-bezier(.2,.8,.2,1);transform-style:preserve-3d;box-shadow:0 6px 20px rgba(0,0,0,.08)}
.front,.back{position:absolute;inset:0;border-radius:16px;display:flex;align-items:center;justify-content:center;backface-visibility:hidden;font-size:2rem;font-weight:800}
.back{background:linear-gradient(135deg,#e2e8f0,#f1f5f9);color:#64748b;content:"?"}
.front{transform:rotateY(180deg);background:white;border:2px solid #e5e7eb}
.revealed .inner{transform:rotateY(180deg)} .matched .inner{transform:rotateY(180deg); box-shadow:0 0 0 3px var(--brand) inset}

.theme-wellness .front{background:linear-gradient(135deg,#ecfeff,#f5f3ff)}
.theme-nature .front{background:linear-gradient(135deg,#ecfccb,#dcfce7)}
.theme-fruits .front{background:linear-gradient(135deg,#fff7ed,#fee2e2)}
.theme-shapes .front{background:linear-gradient(135deg,#f1f5f9,#e2e8f0)}
.theme-letters .front{background:linear-gradient(135deg,#f0f9ff,#e0f2fe)}

.toast{position:fixed;bottom:16px;left:50%;transform:translateX(-50%);background:#6366f1;color:white;padding:10px 14px;border-radius:12px;box-shadow:var(--shadow);font-weight:800;z-index:9999}
.modal{position:fixed;inset:0;background:rgba(15,23,42,.55);display:none;align-items:center;justify-content:center;z-index:9998}
.modal .panel{background:white;border-radius:20px;padding:20px;max-width:420px;width:92%;text-align:center;box-shadow:var(--shadow)}
.modal h2{margin:0 0 6px 0}
.modal .msg{color:var(--muted);margin-bottom:12px}
.modal .row{display:flex;gap:10px;justify-content:center;margin-top:10px}
.btn-sm.primary{background:linear-gradient(135deg,var(--brand), var(--brand2));color:#00111e;border:0}
.btn-sm{cursor:pointer}