/* اضافات مخصوص سایت چالش روی تم skills */
.ch-messages{display:grid;gap:8px;margin-bottom:16px}
.ch-msg{padding:10px 14px;border-radius:12px;border:1px solid var(--sk-line);background:var(--sk-surface);font-size:13.5px}
.ch-msg--success{border-color:rgba(23,114,69,.35);background:rgba(23,114,69,.08)}
.ch-msg--warning{border-color:rgba(154,91,0,.35);background:rgba(233,173,0,.12)}
.ch-msg--error{border-color:rgba(190,40,40,.35);background:rgba(190,40,40,.08)}
.ch-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}
.ch-card{display:flex;flex-direction:column;gap:8px;padding:16px;border:1px solid var(--sk-line);border-radius:16px;background:var(--sk-surface);text-decoration:none;color:inherit}
.ch-card:hover{border-color:var(--sk-primary)}
.ch-card h3{margin:0;font-size:15px}
.ch-card p{margin:0;color:var(--sk-ink-faint);font-size:12.5px;line-height:1.8}
.ch-meta{display:flex;flex-wrap:wrap;gap:6px;font-size:11.5px}
.ch-meta b{padding:2px 9px;border-radius:999px;border:1px solid var(--sk-line);font-weight:700}
.ch-level{color:var(--sk-primary)}
.ch-hero{padding:28px;border-radius:20px;background:var(--sk-surface);border:1px solid var(--sk-line);margin-bottom:22px}
.ch-hero h1{margin:0 0 8px;font-size:24px}
.ch-hero p{margin:0;color:var(--sk-ink-soft);line-height:2}
.ch-section{margin:22px 0 10px;font-size:16px}
.ch-task{border:1px solid var(--sk-line);border-radius:16px;background:var(--sk-surface);padding:16px;margin-bottom:12px}
.ch-task.is-solved{border-color:rgba(23,114,69,.45)}
.ch-task.is-locked{opacity:.6}
.ch-task h3{margin:0 0 6px;font-size:15px}
.ch-task .prompt{margin:0 0 12px;line-height:2}
.ch-form{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.sk-input{border:1px solid var(--sk-line);border-radius:10px;padding:9px 12px;background:var(--sk-surface);font:inherit;color:var(--sk-ink);min-width:260px}
.ch-hints{margin-top:12px;display:grid;gap:6px;font-size:12.5px}
.ch-hint{padding:8px 10px;border-radius:10px;border:1px dashed var(--sk-line)}
.ch-table{width:100%;border-collapse:collapse;font-size:13px}
.ch-table th,.ch-table td{padding:10px;border-bottom:1px solid var(--sk-line);text-align:start}
.ch-auth{max-width:420px;margin:60px auto;padding:28px;border:1px solid var(--sk-line);border-radius:20px;background:var(--sk-surface)}
.ch-auth h1{margin:0 0 6px;font-size:20px}
.ch-auth label{display:block;margin:12px 0 6px;font-size:13px}
.ch-auth .sk-input{width:100%;min-width:0;box-sizing:border-box}
.ch-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px;margin-bottom:20px}
.ch-stat{padding:16px;border-radius:14px;border:1px solid var(--sk-line);background:var(--sk-surface)}
.ch-stat b{display:block;font-size:22px}
.ch-stat span{font-size:12px;color:var(--sk-ink-faint)}
.ch-empty{padding:30px;text-align:center;color:var(--sk-ink-faint);border:1px dashed var(--sk-line);border-radius:16px}