:root{color-scheme:dark;--bg: #111213;--surface: #17191b;--raised: #202326;--soft: #2a2d31;--border: #35383d;--text: #f1f2f3;--muted: #a6adb5;--accent: #a54d67;--accent-soft: #d989a0;--success: #68d8c1;--warning: #ffd36b;--error: #ee6f92;font-family:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:radial-gradient(ellipse 80% 40% at 50% 0%,rgba(180,40,70,.18) 0%,transparent 70%),linear-gradient(180deg,#111213,#131518);color:var(--text)}*{box-sizing:border-box}body{margin:0;min-height:100dvh;background:inherit}main{min-height:100dvh;max-width:1040px;margin:auto;padding:24px}header{display:flex;justify-content:space-between;align-items:center;gap:16px;color:var(--muted)}header strong{color:var(--text);font-size:1.125rem;font-weight:600;letter-spacing:.02em}.header-actions{display:flex;align-items:center;gap:12px}section{max-width:680px;margin:10vh auto 0;display:grid;gap:18px}h1{font-size:clamp(2rem,6vw,3.25rem);font-weight:500;line-height:1.05;margin:0 0 8px}p{color:var(--muted);margin:0;line-height:1.5}label{display:grid;gap:8px;color:var(--text);font-size:.9375rem}textarea,input,select{width:100%;padding:14px;color:inherit;background:var(--surface);border:1px solid var(--border);border-radius:8px;font:inherit}textarea{min-height:140px;resize:vertical}textarea::placeholder,input::placeholder{color:var(--muted)}button{min-height:44px;padding:12px 18px;border:0;border-radius:8px;background:var(--accent);color:var(--text);font:inherit;font-weight:600;cursor:pointer}button.secondary{background:var(--surface);color:var(--text);border:1px solid var(--border)}button:disabled{opacity:.45;cursor:not-allowed}button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.concepts{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.card{border-radius:8px;display:grid;gap:10px;text-align:left;background:var(--surface);color:var(--text);border:1px solid var(--border)}.card[aria-pressed=true]{background:var(--raised);border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}.notice{border-left:3px solid var(--warning);padding-left:12px;color:var(--muted)}.preview{aspect-ratio:9 / 16;max-height:48vh;background:var(--soft);border:1px solid var(--border);border-radius:16px;display:grid;place-items:center;text-align:center;padding:24px}dialog{color:inherit;background:var(--raised);border:1px solid var(--border);border-radius:16px;padding:24px;max-width:460px}[role=status]{color:var(--success);font-size:.875rem}header [role=status]{color:var(--muted)}@media(max-width:980px){.concepts{grid-template-columns:1fr}}@media(max-width:520px){main{padding:16px}header{font-size:.85rem}section{margin-top:7vh}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}