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0;display:grid;position:relative}.challenge-checkpoint:not(:last-child):after{content:"";background:var(--line);width:1px;position:absolute;top:66px;bottom:-2px;left:21px}.checkpoint-marker{z-index:1;border:1px solid var(--line);width:44px;height:44px;color:var(--muted);font-family:var(--font-mono);background:#fff;border-radius:50%;place-items:center;font-size:12px;display:grid;position:relative}.challenge-checkpoint.is-complete .checkpoint-marker{border-color:var(--teal);background:var(--teal);color:#fff}.challenge-checkpoint header{align-items:center;gap:10px;display:flex}.challenge-checkpoint h3{margin:0;font-size:17px}.challenge-checkpoint header span{border-radius:var(--radius-pill);background:var(--accent-surface);color:var(--accent-foreground);padding:4px 8px;font-size:10px}.challenge-checkpoint p{color:var(--muted);margin:7px 0 0;font-size:13px;line-height:1.65}.checkpoint-done{color:var(--teal);margin-top:12px;font-size:12px;display:inline-flex}.challenge-flag-form{grid-template-columns:minmax(180px,1fr) auto;gap:9px;max-width:620px;margin-top:15px;display:grid}.challenge-flag-form input{background:var(--surface-soft);min-width:0;color:var(--ink);font-family:var(--font-mono);border:1px solid #0000;border-radius:12px;outline:none;padding:11px 13px}.challenge-flag-form input:focus{border-color:var(--teal);background:#fff;box-shadow:0 0 0 3px #557fff2e}.challenge-flag-form .primary-button{min-height:40px}.challenge-flag-feedback{grid-column:1/-1;margin:0;font-size:12px}.challenge-flag-feedback.is-correct{color:#178353}.challenge-flag-feedback.is-wrong,.challenge-flag-feedback.is-rate_limited{color:var(--danger)}.challenge-coach-entry{grid-template-columns:minmax(0,1.2fr) minmax(300px,.8fr);gap:28px;display:grid}.challenge-coach-entry>div{padding:18px 10px}.challenge-coach-entry h2{letter-spacing:-.04em;margin:10px 0;font-size:clamp(26px,4vw,40px)}.challenge-coach-entry>div>p{max-width:580px;color:var(--muted);line-height:1.75}.challenge-coach-entry>div>.primary-button{margin-top:18px}.challenge-coach-entry aside{border-radius:var(--radius-md);background:var(--surface-soft);padding:22px}.challenge-coach-entry aside>small{color:var(--muted)}.challenge-coach-entry aside h3{margin:10px 0 6px}.challenge-coach-entry aside>p{color:var(--muted);font-size:13px;line-height:1.6}.challenge-coach-page__header{border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--card);gap:20px;margin-bottom:14px;padding:24px;display:grid}.challenge-coach-page__header h1{margin-bottom:8px;font-size:clamp(28px,4vw,44px)}.challenge-coach-page__header p{color:var(--muted);margin:0}.ai-guidance__context{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--line);grid-template-columns:1.4fr .6fr;gap:1px;display:grid}.ai-guidance__context>div{background:#f8f9fb;padding:16px 20px}.ai-guidance__context small,.ai-guidance__context strong{display:block}.ai-guidance__context small{color:var(--muted);font-size:10px}.ai-guidance__context strong{margin-top:6px;font-size:13px}.ai-guidance__context p{color:var(--muted);margin:6px 0 0;font-size:12px;line-height:1.55}@media (max-width:820px){.challenge-detail-hero,.challenge-coach-entry,.challenge-mode-tabs,.ai-guidance__context{grid-template-columns:1fr}}@media (max-width:560px){.challenge-detail-hero,.challenge-checkpoint-panel,.challenge-coach-entry{padding:17px}.challenge-detail-identity h1{font-size:34px}.challenge-flag-form{grid-template-columns:1fr}.challenge-flag-feedback{grid-column:1}}.challenge-bank-panel{padding:22px 24px 24px}.challenge-bank-panel .panel-title{border-bottom:0;margin-bottom:2px;padding-bottom:0}.challenge-bank-panel .panel-title h2{font-family:var(--font-sans);letter-spacing:-.01em;color:var(--ink);margin:0;font-size:18px;font-weight:700}.challenge-bank-panel .panel-title__actions{gap:12px}.challenge-bank-panel .panel-title__actions strong{border-radius:var(--radius-pill);background:color-mix(in srgb, var(--teal) 10%, transparent);min-width:30px;color:var(--teal);font-family:var(--font-mono);justify-content:center;align-items:center;padding:3px 10px;font-size:12px;font-weight:600;display:inline-flex}.challenge-bank-panel .panel-title__actions .text-button{border-radius:var(--radius-pill);color:var(--muted);padding:6px 10px;font-size:12px;font-weight:600;transition:background .16s,color .16s}.challenge-bank-panel .panel-title__actions .text-button:hover{background:var(--surface-soft);color:var(--ink);text-decoration:none}.challenge-bank-panel .challenge-filters{grid-template-columns:minmax(200px,1.4fr) repeat(3,minmax(120px,1fr));gap:10px;margin:16px 0 18px;display:grid}.challenge-bank-panel .challenge-filters .search-input{border-radius:var(--radius-sm);background:var(--surface-soft);width:100%;height:40px;color:var(--ink);border:1px solid #0000;padding:0 12px;font-size:13px;transition:background .16s,border-color .16s,box-shadow .16s}.challenge-bank-panel .challenge-filters .search-input:focus{border-color:var(--teal);background:var(--card);box-shadow:0 0 0 3px color-mix(in srgb, var(--teal) 18%, transparent);outline:0}.challenge-bank-panel .challenge-list{gap:10px;max-height:none;padding-right:0;display:grid}.challenge-bank-panel .challenge-list .class-row{border:1px solid var(--line);border-radius:var(--radius-md);background:var(--card);margin-bottom:0;padding:0;transition:border-color .16s,background .16s,transform .16s,box-shadow .16s;display:block}.challenge-bank-panel .challenge-list .class-row:hover{border-color:color-mix(in srgb, var(--teal) 40%, var(--line));background:color-mix(in srgb, var(--accent-surface) 22%, var(--card));transform:translateY(-2px);box-shadow:0 6px 18px #1018280d}.challenge-bank-panel .challenge-list .class-row.is-active{border-color:color-mix(in srgb, var(--teal) 40%, var(--line));background:color-mix(in srgb, var(--accent-surface) 26%, var(--card))}.challenge-bank-panel .challenge-row__open{gap:16px;width:100%;padding:15px 18px}.challenge-bank-panel .challenge-row__main strong{letter-spacing:-.01em;color:var(--ink);font-size:15px;font-weight:600}.challenge-bank-panel .challenge-row__main small{color:var(--muted);margin-top:6px;font-size:12px}.challenge-bank-panel .challenge-row__meta{flex-wrap:wrap;justify-content:flex-end;gap:8px}.challenge-bank-panel .version-badge{border-radius:var(--radius-pill);background:var(--surface-soft);color:var(--muted);font-family:var(--font-mono);border:0;padding:3px 10px;font-size:11px;font-weight:600}.challenge-bank-panel .completion-pill{border-radius:var(--radius-pill);background:color-mix(in srgb, var(--chart-2) 14%, transparent);color:var(--chart-3);align-items:center;gap:6px;padding:3px 10px;font-size:11px;font-weight:600;display:inline-flex}.challenge-bank-panel .completion-pill:before{content:"";background:currentColor;border-radius:50%;width:6px;height:6px}.challenge-bank-panel .completion-pill--empty{background:color-mix(in srgb, var(--muted) 14%, transparent);color:var(--muted)}.challenge-bank-panel .challenge-row__go{border-radius:var(--radius-pill);background:var(--teal);color:#fff;white-space:nowrap;align-items:center;padding:6px 14px;font-size:12px;font-style:normal;font-weight:600;transition:background .16s,transform .16s;display:inline-flex}.challenge-bank-panel .challenge-list .class-row:hover .challenge-row__go{background:var(--teal-dark)}.challenge-bank-panel .challenge-list .challenge-row__open:disabled{cursor:not-allowed}.challenge-bank-panel .challenge-list .class-row:has(.challenge-row__open:disabled){opacity:.62}.challenge-bank-panel .challenge-list .class-row:has(.challenge-row__open:disabled):hover{border-color:var(--line);background:var(--card);box-shadow:none;transform:none}.challenge-bank-panel .challenge-list .challenge-row__open:disabled .challenge-row__go{background:var(--surface-soft);color:var(--muted)}.challenge-bank-panel .challenge-list .muted{text-align:center;color:var(--muted);padding:36px 12px;font-size:13px}@media (max-width:1100px){.challenge-bank-panel .challenge-filters{grid-template-columns:repeat(2,minmax(0,1fr))}.challenge-bank-panel .challenge-filters .search-input:first-child{grid-column:1/-1}}@media (max-width:640px){.challenge-bank-panel .challenge-filters{grid-template-columns:1fr}.challenge-bank-panel .challenge-row__open{flex-direction:column;align-items:flex-start;gap:10px}.challenge-bank-panel .challenge-row__meta{justify-content:flex-start}}.challenge-bank-panel .challenge-row__open{align-items:center;gap:14px}.challenge-bank-panel .challenge-row__avatar{background:linear-gradient(135deg, var(--chart-1), var(--chart-2));color:#fff;width:40px;height:40px;font-family:var(--font-mono);letter-spacing:-.02em;border-radius:12px;flex:none;place-items:center;font-size:15px;font-weight:700;display:grid}.challenge-bank-panel .challenge-list .class-row:has(.challenge-row__open:disabled) .challenge-row__avatar{background:linear-gradient(135deg, var(--muted), color-mix(in srgb, var(--ink) 60%, var(--muted)))}.challenge-bank-panel .challenge-row__main{flex:1 1 0;min-width:0}.challenge-bank-panel .challenge-row__main small{margin-top:4px;font-size:12px}.challenge-bank-panel .challenge-row__meta{flex-wrap:wrap;justify-content:flex-end;align-items:center;gap:8px 10px}.challenge-bank-panel .challenge-row__chips{flex-wrap:wrap;justify-content:flex-end;align-items:center;gap:6px;display:inline-flex}.challenge-chip{border-radius:var(--radius-pill);white-space:nowrap;align-items:center;padding:3px 9px;font-size:11px;font-weight:600;display:inline-flex}.challenge-chip--type{background:var(--surface-soft);color:var(--muted)}.challenge-chip--easy{color:#0b8a4f;background:#12b76a24}.challenge-chip--medium{color:#8c6423;background:#d19a3e29}.challenge-chip--hard{color:#b54255;background:#ef444424}@media (max-width:760px){.challenge-bank-panel .challenge-row__avatar{width:36px;height:36px;font-size:13px}.challenge-bank-panel .challenge-row__chips{justify-content:flex-start;width:100%}}.practice-mode-backdrop{z-index:60;padding:24px}.practice-mode-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-lg);width:min(560px,100%);padding:26px 28px 20px;box-shadow:0 24px 60px #0e11152e}.practice-mode-card__head{border-bottom:1px solid var(--line);gap:6px;padding-bottom:16px;display:grid}.practice-mode-card__eyebrow{color:var(--teal);font-family:var(--font-mono);letter-spacing:.18em;text-transform:uppercase;font-size:10px;font-weight:700}.practice-mode-card__head h2{font-family:var(--font-sans);letter-spacing:-.01em;color:var(--ink);margin:0;font-size:20px;font-weight:700}.practice-mode-card__hint{color:var(--muted);margin:0;font-size:12px}.practice-mode-grid{grid-template-columns:1fr 1fr;gap:12px;margin-top:16px;display:grid}.practice-mode-card__option{border:1px solid var(--line);border-radius:var(--radius-md);background:var(--card);color:var(--ink);text-align:left;cursor:pointer;grid-template-rows:auto auto auto;gap:10px;padding:16px;transition:border-color .16s,background .16s,transform .16s,box-shadow .16s;display:grid}.practice-mode-card__option:hover{border-color:color-mix(in srgb, var(--teal) 40%, var(--line));background:color-mix(in srgb, var(--accent-surface) 22%, var(--card));transform:translateY(-2px);box-shadow:0 6px 18px #1018280d}.practice-mode-card__option:focus-visible{outline:2px solid var(--teal);outline-offset:2px}.practice-mode-card__icon{color:#fff;border-radius:13px;place-items:center;width:44px;height:44px;display:grid}.practice-mode-card__icon svg{width:22px;height:22px}.practice-mode-card__icon--solve{background:linear-gradient(135deg, var(--chart-1), var(--chart-2))}.practice-mode-card__icon--guide{background:linear-gradient(135deg, var(--chart-2), var(--chart-4))}.practice-mode-card__body strong{letter-spacing:-.005em;color:var(--ink);font-size:14px;font-weight:600;display:block}.practice-mode-card__body small{color:var(--muted);margin-top:5px;font-size:12px;line-height:1.6;display:block}.practice-mode-card__cta{color:var(--teal);font-size:12px;font-style:normal;font-weight:600}.practice-mode-card__note{background:var(--surface-soft);color:var(--muted);border-radius:var(--radius-sm);align-items:center;gap:8px;margin:16px 0 0;padding:9px 12px;font-size:11px;display:flex}.practice-mode-card__note i{background:#44dcaf;border-radius:50%;flex:none;width:6px;height:6px;box-shadow:0 0 10px #44dcaf80}.practice-mode-card__footer{justify-content:flex-end;margin-top:12px;display:flex}@media (max-width:560px){.practice-mode-grid{grid-template-columns:1fr}}.practice-page .panel-title{flex-wrap:wrap;gap:14px}.practice-title__heading{align-items:center;gap:12px;min-width:0;display:flex}.practice-title__heading h2{font-family:var(--font-sans);letter-spacing:-.01em;color:var(--ink);margin:0;font-size:18px;font-weight:700}.practice-mode-badge{border-radius:var(--radius-pill);white-space:nowrap;align-items:center;gap:6px;padding:4px 11px;font-size:11px;font-weight:600;display:inline-flex}.practice-mode-badge:before{content:"";background:currentColor;border-radius:50%;width:6px;height:6px}.practice-mode-badge--solve{background:color-mix(in srgb, var(--teal) 12%, transparent);color:var(--teal)}.practice-mode-badge--guide{background:color-mix(in srgb, var(--chart-4) 14%, transparent);color:var(--chart-4)}@media (max-width:720px){.practice-title__heading{flex-basis:100%}.practice-page .panel-title{gap:10px}}