:root{--bg: #0f1117;--bg-card: #181b25;--bg-input: #12141e;--border: #2d3248;--text: #e4e6ed;--text-dim: #9da3b5;--accent: #4e7a1e;--accent-hover: #629924;--danger: #e05252;--mono: "JetBrains Mono", monospace;--sans: "Outfit", system-ui, sans-serif}*{margin:0;padding:0;box-sizing:border-box}html{font-size:16px}body{font-family:var(--sans);background:var(--bg);color:var(--text);min-height:100vh;display:flex;flex-direction:column;line-height:1.6}.site-nav{border-bottom:1px solid var(--border);background:var(--bg-card)}.nav-inner{max-width:960px;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;height:56px}.nav-logo{font-size:1.1rem;font-weight:700;color:var(--text);text-decoration:none;letter-spacing:-.02em}.nav-links{display:flex;gap:4px}.nav-links a{font-size:.85rem;font-weight:500;color:var(--text-dim);text-decoration:none;padding:6px 14px;border-radius:6px;transition:color .15s,background .15s}.nav-links a:hover{color:var(--text);background:#ffffff0a}.nav-links a.active{color:var(--accent);background:#4e7a1e1a}@media(max-width:520px){.nav-inner{flex-direction:column;height:auto;padding:12px 16px;gap:8px}.nav-links{gap:2px}.nav-links a{font-size:.8rem;padding:5px 10px}}main{flex:1;max-width:900px;margin:0 auto;padding:40px 24px;width:100%}main.wide{max-width:1100px}h1{font-size:2rem;font-weight:700;margin-bottom:8px;letter-spacing:-.02em}h2{font-size:1.4rem;font-weight:600;margin-bottom:12px}h3{font-size:1.1rem;font-weight:600;margin-bottom:8px}.subtitle{color:var(--text-dim);font-size:1.05rem;margin-bottom:32px}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:10px;padding:24px;margin-bottom:16px}input,select{font-family:var(--sans);font-size:.9rem;background:var(--bg-input);border:1px solid var(--border);color:var(--text);padding:10px 14px;border-radius:6px;width:100%;outline:none;transition:border-color .15s}input:focus,select:focus{border-color:var(--accent)}input::placeholder{color:#5a6078}label{display:block;font-size:.85rem;color:var(--text-dim);margin-bottom:6px;font-weight:400}.form-row{margin-bottom:16px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}@media(max-width:600px){.form-grid{grid-template-columns:1fr}}.checkbox-label{display:flex;align-items:center;gap:8px;cursor:pointer;font-size:.9rem;color:var(--text-dim);user-select:none}.checkbox-label input[type=checkbox]{width:18px;height:18px;min-width:18px;accent-color:var(--accent);cursor:pointer}button,.btn{font-family:var(--sans);font-size:.95rem;font-weight:600;padding:10px 24px;border-radius:6px;border:none;cursor:pointer;transition:all .15s;text-decoration:none;display:inline-block}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover)}.btn-outline{background:transparent;color:var(--text-dim);border:1px solid var(--border)}.btn-outline:hover{border-color:var(--text-dim);color:var(--text)}.btn-danger{background:transparent;color:var(--danger);border:1px solid var(--danger);font-size:.8rem;padding:6px 14px}.btn-danger:hover{background:var(--danger);color:#fff}.btn-sm{font-size:.8rem;padding:6px 14px}.btn-secondary{background:transparent;color:var(--text);border:1px solid var(--border)}.btn-secondary:hover:not(:disabled){border-color:var(--accent);color:var(--accent)}.btn-secondary:disabled{opacity:.5;cursor:not-allowed}.alert{padding:14px 18px;border-radius:8px;margin-bottom:20px;font-size:.9rem}.alert-success{background:#172613;border:1px solid #2d5a1a;color:#a0d870}.alert-error{background:#2a1318;border:1px solid #5a1a2a;color:#f09090}.alert-info{background:#131a2a;border:1px solid #1a2a5a;color:#7db4d8}code,.mono{font-family:var(--mono);font-size:.85em}.tag{display:inline-block;background:var(--bg-input);border:1px solid var(--border);border-radius:4px;padding:2px 8px;font-size:.75rem;color:var(--text-dim);font-family:var(--mono)}.board-preview{display:none;grid-template-columns:repeat(8,1fr);width:264px;border:2px solid var(--border);border-radius:4px;overflow:hidden;margin-top:8px}.board-sq{aspect-ratio:1;display:flex;align-items:center;justify-content:center;user-select:none;position:relative}.board-sq img{width:100%;height:100%}.board-sq.light{background:#f0d9b5}.board-sq.dark{background:#b58863}.board-invalid{font-family:var(--mono);font-size:.8rem;color:var(--danger);margin-top:6px;display:none}