:root{
  --ink:#1a2330; --muted:#5c6b7f; --bg:#f6f8fa; --card:#ffffff;
  --accent:#d64541; --accent-dark:#b03a37; --line:#e3e8ee;
  --easy:#2eaf5d; --medium:#9aa5b1; --hard:#d64541;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
a{color:var(--accent-dark);text-decoration:none}
a:hover{text-decoration:underline}

.site-header{background:var(--ink);color:#fff}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
.logo{font-size:1.4rem;font-weight:800;color:#fff;letter-spacing:-.5px}
.logo span{color:var(--accent)}
.site-header nav a{color:#cfd8e3;margin-left:22px;font-size:.95rem}
.site-header nav a:hover{color:#fff;text-decoration:none}

.azbar{background:#232f3f;padding:6px 0}
.azbar .wrap{display:flex;flex-wrap:wrap;gap:2px}
.az{display:inline-block;min-width:26px;text-align:center;padding:2px 4px;border-radius:4px;color:#9fb0c3;font-size:.85rem;font-weight:600}
.az:hover{background:var(--accent);color:#fff;text-decoration:none}
.az.empty{opacity:.35}

.hero{text-align:center;padding:56px 0 32px}
.hero h1{font-size:2.3rem;letter-spacing:-1px;margin-bottom:10px}
.hero p{color:var(--muted);max-width:640px;margin:0 auto 24px}
#search{width:100%;max-width:560px;padding:14px 18px;font-size:1.05rem;border:2px solid var(--line);border-radius:10px;outline:none}
#search:focus{border-color:var(--accent)}
#results{max-width:560px;margin:6px auto 0;text-align:left}
#results a{display:block;background:var(--card);border:1px solid var(--line);padding:10px 14px;margin-top:4px;border-radius:8px}

.legend{display:flex;gap:22px;justify-content:center;color:var(--muted);font-size:.9rem;margin:8px 0 26px;flex-wrap:wrap}
.dot{display:inline-block;width:11px;height:11px;border-radius:50%;background:var(--medium);margin-right:6px;vertical-align:baseline}
.dot.easy{background:var(--easy)} .dot.medium{background:var(--medium)} .dot.hard{background:var(--hard)} .dot.unknown{background:#c9d2dc}

h2{margin:34px 0 14px;font-size:1.35rem}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:16px;display:block;transition:box-shadow .15s, transform .15s}
.card:hover{box-shadow:0 4px 14px rgba(16,24,40,.08);transform:translateY(-1px);text-decoration:none}
.card-title{display:block;font-weight:700;color:var(--ink);margin:6px 0 4px}
.card-sub{display:block;color:var(--muted);font-size:.85rem;line-height:1.45}

.entry{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:36px;margin:36px 0}
.entry h1{font-size:1.7rem;letter-spacing:-.5px;margin-bottom:6px}
.entry .meta{color:var(--muted);font-size:.9rem;margin-bottom:22px}
.entry-body p{margin:0 0 14px}
.entry-body ul,.entry-body ol{margin:0 0 14px 22px}
.tags{margin-top:20px}
.tag{display:inline-block;background:var(--bg);border:1px solid var(--line);border-radius:999px;padding:3px 12px;font-size:.8rem;color:var(--muted);margin:0 6px 6px 0}
.backlink{margin-top:18px}
.muted{color:var(--muted)}

.contact-form{max-width:520px;margin-top:10px}
.contact-form label{display:block;margin-bottom:14px;font-weight:600;font-size:.9rem}
.contact-form input,.contact-form textarea{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;font:inherit;margin-top:4px}
.contact-form button{background:var(--accent);color:#fff;border:0;border-radius:8px;padding:12px 28px;font-size:1rem;font-weight:700;cursor:pointer}
.contact-form button:hover{background:var(--accent-dark)}

.site-footer{background:var(--ink);color:#cfd8e3;margin-top:60px;padding:36px 0}
.site-footer a{color:#fff}
.site-footer .fineprint{margin-top:14px;font-size:.85rem;color:#8fa1b5}
@media(max-width:600px){.hero h1{font-size:1.7rem}.entry{padding:22px}}
.dlist{list-style:none;columns:3;column-gap:28px;margin:0 0 10px}
.dlist li{margin:0 0 6px;break-inside:avoid}
.count{color:var(--muted);font-size:.9rem;font-weight:400}
.browse-all{text-align:center;margin:26px 0;font-size:1.05rem;font-weight:700}
@media(max-width:800px){.dlist{columns:2}} @media(max-width:500px){.dlist{columns:1}}