:root{--bg:#0f1220;--surface:#1a1e33;--surface-2:#232843;--border:#313864;--text:#e8eaf6;--muted:#a2a8cc;--accent:#6c8cff;--accent-strong:#4d6bff;--danger:#ff6b6b;--success:#43d19e;--radius:12px}*{box-sizing:border-box}body,html{margin:0;padding:0}body{background:radial-gradient(1200px 600px at 20% -10%,#1c2350 0,transparent),var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;min-height:100vh;overflow-x:hidden}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.site-header{display:flex;align-items:center;justify-content:space-between;padding:14px 24px;border-bottom:1px solid var(--border);background:rgba(15,18,32,.7);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);position:-webkit-sticky;position:sticky;top:0;z-index:10}.brand{font-size:20px;font-weight:700;color:var(--text)}.brand:hover{text-decoration:none}.site-nav{display:flex;align-items:center;gap:18px}.button,.nav-cta{background:var(--accent-strong);color:#fff;padding:8px 16px;border-radius:8px;border:none;font-weight:600;cursor:pointer;display:inline-block}.button:hover,.nav-cta:hover{background:var(--accent);text-decoration:none}.button.secondary{background:var(--surface-2);border:1px solid var(--border)}.button.secondary.active{border-color:var(--accent);color:#fff;box-shadow:inset 0 0 0 1px var(--accent)}.button.danger{background:transparent;border:1px solid var(--danger);color:var(--danger)}.button:disabled{opacity:.5;cursor:not-allowed}.link-button{background:none;border:none;color:var(--accent);cursor:pointer;font:inherit;padding:0}.link-button:hover{text-decoration:underline}.site-main{max-width:1100px;margin:0 auto;padding:32px 24px 64px}.hero{text-align:center;padding:48px 0 32px}.hero h1{font-size:42px;margin:0 0 12px;line-height:1.1}.hero p{color:var(--muted);font-size:18px;max-width:620px;margin:0 auto 24px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px}.form{max-width:400px;margin:32px auto;display:flex;flex-direction:column;gap:14px}.form h1{margin:0 0 8px}label{display:block;font-size:14px;color:var(--muted);margin-bottom:6px}input[type=email],input[type=file],input[type=password],input[type=text],select{width:100%;padding:10px 12px;background:var(--surface-2);border:1px solid var(--border);border-radius:8px;color:var(--text);font:inherit}input:focus,select:focus{outline:2px solid var(--accent);border-color:var(--accent)}.error{color:var(--danger);font-size:14px}.muted{color:var(--muted)}.grid-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));grid-gap:18px;gap:18px;margin-top:24px}.puzzle-card img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:8px;background:var(--surface-2)}.puzzle-card h3{margin:10px 0 4px;font-size:16px}.card-actions{display:flex;gap:8px;margin-top:10px;align-items:center;flex-wrap:wrap}.puzzle-card .card-actions .button{padding:6px 12px;font-size:14px}.preset-row{display:flex;gap:10px;flex-wrap:wrap}.preset{padding:10px 16px;border-radius:8px;border:1px solid var(--border);background:var(--surface-2);color:var(--text);cursor:pointer;font-weight:600}.preset.active{border-color:var(--accent);background:var(--accent-strong);color:#fff}.solve-toolbar{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:12px}.progress{font-weight:600}.solved-banner{background:var(--success);color:#06231a;font-weight:700;padding:10px 16px;border-radius:8px}.board-wrap{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);overflow:auto}.admin-table{width:100%;border-collapse:collapse;font-size:14px}.admin-table td,.admin-table th{text-align:left;padding:10px 12px;border-bottom:1px solid var(--border);vertical-align:middle}.admin-table th{color:var(--muted);font-weight:600}.admin-table .button{padding:5px 10px;font-size:13px}.solve-fullbleed{width:100vw;margin-left:calc(50% - 50vw);padding:0 16px;box-sizing:border-box}.reference-thumb{position:absolute;top:12px;right:12px;width:160px;max-width:40%;border-radius:8px;border:2px solid var(--accent);box-shadow:0 6px 20px rgba(0,0,0,.45);z-index:5;pointer-events:none}