:root{--bg: #0f172a;--bg-card: #1e293b;--text: #e2e8f0;--text-dim: #94a3b8;--accent: #6366f1;--accent-hover: #4f46e5;--fresh: #fbbf24;--library: #38bdf8;--error-bg: #7f1d1d;--error-text: #fecaca;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;color-scheme:dark}*{box-sizing:border-box}html,body{margin:0;padding:0;min-height:100%}body{background:radial-gradient(circle at 20% -10%,#1e293b,var(--bg) 60%);color:var(--text);line-height:1.6}.app{max-width:720px;margin:0 auto;padding:2.5rem 1.25rem 4rem;display:flex;flex-direction:column;min-height:100vh}.header{text-align:center;margin-bottom:2rem}.header h1{font-size:clamp(1.9rem,5vw,2.8rem);margin:0 0 .5rem;letter-spacing:-.02em}.tagline{color:var(--text-dim);margin:0 auto;max-width:46ch}.main{flex:1;display:flex;flex-direction:column;align-items:center;gap:1.5rem}.teach-button{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:none;cursor:pointer;background:linear-gradient(135deg,var(--accent),var(--accent-hover));color:#fff;font-size:1.15rem;font-weight:600;padding:.9rem 2rem;border-radius:999px;box-shadow:0 8px 24px #4f46e559;transition:transform .08s ease,box-shadow .2s ease,opacity .2s ease}.teach-button:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 10px 28px #4f46e580}.teach-button:active:not(:disabled){transform:translateY(0)}.teach-button:disabled{opacity:.6;cursor:progress}.teach-button{display:inline-flex;align-items:center;gap:.55rem;min-width:13.5rem;justify-content:center}.spinner{width:1em;height:1em;border-radius:50%;border:2px solid rgba(255,255,255,.35);border-top-color:#fff;animation:spin .7s linear infinite}@keyframes 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strong{color:var(--text)}.footer-progress{display:flex;flex-direction:column;gap:.4rem;min-width:12rem}.progress-track{display:block;height:4px;border-radius:999px;background:#94a3b82e;overflow:hidden}.progress-fill{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--library));border-radius:999px;transition:width .3s ease}.controls{display:flex;align-items:center;gap:.75rem}.nav-button{-webkit-appearance:none;-moz-appearance:none;appearance:none;cursor:pointer;background:var(--bg-card);color:var(--text);border:1px solid rgba(148,163,184,.25);width:2.9rem;height:2.9rem;border-radius:999px;font-size:1.25rem;line-height:1;display:inline-flex;align-items:center;justify-content:center;transition:transform .08s ease,border-color .2s ease,opacity .2s ease}.nav-button:hover:not(:disabled){transform:translateY(-1px);border-color:var(--accent)}.nav-button:disabled{opacity:.35;cursor:default}.footer-actions{display:flex;align-items:center;gap:1rem;flex-wrap:wrap}.reset-button{-webkit-appearance:none;-moz-appearance:none;appearance:none;cursor:pointer;background:transparent;color:var(--text-dim);border:1px solid rgba(148,163,184,.25);border-radius:999px;padding:.3rem .8rem;font-size:.8rem;transition:color .2s ease,border-color .2s ease}.reset-button:hover:not(:disabled){color:var(--text);border-color:var(--accent)}.reset-button:disabled{opacity:.4;cursor:default}.reset-confirm{display:inline-flex;align-items:center;gap:.5rem;flex-wrap:wrap}.reset-confirm-text{color:var(--text)}.reset-yes,.reset-no{-webkit-appearance:none;-moz-appearance:none;appearance:none;cursor:pointer;border-radius:999px;padding:.3rem .8rem;font-size:.8rem;font-weight:600;border:1px solid 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select:focus-visible,.filter-search input:focus-visible{outline:2px solid var(--accent);outline-offset:1px}.filter-search{position:relative;flex:1;min-width:13rem}.filter-search input{width:100%;background:var(--bg-card);color:var(--text);border:1px solid rgba(148,163,184,.25);border-radius:10px;padding:.55rem .8rem;font-size:.9rem}.filter-search input::placeholder{color:var(--text-dim)}.search-results{position:absolute;top:100%;left:0;right:0;margin:.35rem 0 0;padding:.3rem;list-style:none;background:var(--bg-card);border:1px solid rgba(148,163,184,.25);border-radius:10px;box-shadow:0 12px 32px #00000073;max-height:20rem;overflow-y:auto;z-index:10}.search-results li{margin:0}.search-results button{display:flex;flex-direction:column;gap:.1rem;width:100%;text-align:left;background:transparent;border:none;color:var(--text);padding:.5rem .6rem;border-radius:7px;cursor:pointer}.search-results button:hover{background:#6366f129}.sr-field{font-size:.68rem;text-transform:uppercase;letter-spacing:.04em;color:var(--text-dim)}.sr-title{font-size:.9rem;line-height:1.3}.search-empty{position:absolute;top:100%;margin:.35rem 0 0;font-size:.82rem;color:var(--text-dim)}button:focus-visible{outline:2px solid var(--accent);outline-offset:2px}@media (prefers-reduced-motion: reduce){.card{animation:none}.teach-button,.nav-button,.progress-fill{transition:none}}@media (max-width: 520px){.app{padding-top:1.75rem}.filters{flex-direction:column;align-items:stretch;gap:.6rem}.filter-field select{width:100%}.filter-search{min-width:0}.teach-button{min-width:0;flex:1;padding:1rem 1.5rem}.controls{width:100%}.nav-button{width:3.25rem;height:3.25rem;flex-shrink:0}.card{padding:1.25rem 1.15rem}.footer{flex-direction:column;align-items:stretch}}.share-button{margin-left:auto;-webkit-appearance:none;-moz-appearance:none;appearance:none;cursor:pointer;background:transparent;color:var(--library);border:1px solid rgba(56,189,248,.4);border-radius:999px;padding:.2rem .75rem;font-size:.72rem;font-weight:600;text-transform:uppercase;letter-spacing:.04em;transition:background .2s ease,color .2s ease}.share-button:hover{background:#38bdf829}