:root{color-scheme:dark;--color-bg: #0b0b0d;--color-surface: #18181b;--color-border: #2e2e33;--color-border-hover: #45454c;--color-text: #e8e8ea;--color-text-muted: #9a9aa2;--color-accent: #60a5fa;--color-bubble-user: #1e3a5f;--color-bubble-user-text: #dbeafe;--color-bubble-agent: #202024;--color-warning-bg: #3a2e10;--color-warning-border: #b45309;--color-warning-text: #fbbf24;--color-success-text: #4ade80;--color-danger-text: #f87171;--color-table-header-bg: #232327;--color-difficulty-easy: #4ade80;--color-difficulty-medium: #f0b429;--color-difficulty-hard: #fb7185}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--color-bg);color:var(--color-text);font-family:system-ui,-apple-system,Segoe UI,sans-serif;line-height:1.55;-webkit-font-smoothing:antialiased}h1,h2,h3{line-height:1.25;margin:0 0 .75rem}a{color:var(--color-accent)}button{font-family:inherit;font-size:1rem;padding:.55rem 1.1rem;border-radius:.5rem;border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-text);cursor:pointer;transition:border-color .15s ease,background .15s ease}button:hover:not(:disabled){border-color:var(--color-border-hover)}button:disabled{cursor:not-allowed;opacity:.55}textarea,input{font-family:inherit;font-size:1rem;padding:.5rem .65rem;border-radius:.5rem;border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-text)}textarea:focus,input:focus{outline:2px solid var(--color-accent);outline-offset:1px}.app-header{display:flex;justify-content:space-between;align-items:center;padding:.875rem 1.5rem;background:var(--color-surface);border-bottom:1px solid var(--color-border)}.app-header__brand{font-weight:700;font-size:1.05rem;color:var(--color-text);text-decoration:none}.app-header__nav a{color:var(--color-text-muted);text-decoration:none;font-size:.9rem}.app-header__nav a:hover{color:var(--color-accent)}.app-container{max-width:44rem;margin:0 auto;padding:2rem 1.5rem 3rem}.case-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:1rem;margin:1.5rem 0}.case-card{display:block;width:100%;text-align:left;background:var(--color-surface);border:1px solid var(--color-border);border-radius:14px;padding:1.1rem 1.25rem;font-family:inherit;color:inherit;transition:transform .15s ease,border-color .15s ease}.case-card:hover{transform:translateY(-2px);border-color:var(--color-border-hover)}.case-card__eyebrow{display:block;font-size:.72rem;text-transform:uppercase;letter-spacing:.05em;color:var(--color-text-muted);margin-bottom:.3rem}.case-card__type{display:block;font-size:1.05rem;font-weight:700}.case-card__footer{display:flex;justify-content:space-between;align-items:center;margin-top:.9rem;padding-top:.75rem;border-top:1px solid var(--color-border);font-size:.85rem}.case-card__difficulty{font-weight:600}.case-card__duration{color:var(--color-text-muted)}.md-content table{border-collapse:collapse;width:100%;margin:.5rem 0;font-size:.92rem}.md-content th,.md-content td{border:1px solid var(--color-border);padding:.35rem .6rem;text-align:left}.md-content th{background:var(--color-table-header-bg)}.md-content p{margin:.4rem 0}.md-content p:first-child{margin-top:0}.md-content p:last-child{margin-bottom:0}