:root{--bg:#e8eef8;--bg-soft:#f3f6fc;--panel:#fff;--text:#1a2332;--muted:#6b7a90;--accent:#2b6ce6;--accent-soft:#85a9ee;--danger:#d64545;--border:#d5dee9;--nav:#fff;--shadow:0 8px 28px rgba(30,64,140,.12);--max:420px;color-scheme:light}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:Segoe UI,system-ui,-apple-system,BlinkMacSystemFont,Roboto,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased}a{color:var(--accent)}.app-shell{width:100%;max-width:var(--max);margin:0 auto;min-height:100dvh;background:var(--bg-soft);position:relative;box-shadow:0 0 0 1px rgba(0,0,0,.04)}.app-shell--pad{padding:calc(16px + env(safe-area-inset-top, 0px)) 16px calc(88px + env(safe-area-inset-bottom, 0px))}.app-shell--flush{padding:0 0 env(safe-area-inset-bottom,0)}button,input,select,textarea{font-size:16px;font-family:inherit}.btn{display:inline-flex;align-items:center;justify-content:center;width:100%;min-height:48px;padding:12px 16px;border:none;border-radius:10px;background:var(--accent);color:#fff;font-weight:700;letter-spacing:.02em;cursor:pointer}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-ghost{border:1px solid var(--border)}.btn-ghost,.btn-text{background:transparent;color:var(--accent)}.btn-text{border:none;font-weight:700;width:auto;min-height:44px;padding:8px 4px}.field{width:100%;padding:12px 14px;border-radius:999px;border:1px solid var(--border);background:#fff;color:var(--text)}.field:disabled{background:#eef2f7;color:var(--muted)}.field-label{display:block;font-weight:600;margin:16px 0 8px}.muted{color:var(--muted)}.error{color:var(--danger);font-size:14px;margin-top:10px}.card{background:var(--panel);border-radius:16px;padding:20px;box-shadow:var(--shadow)}.toast-host{position:fixed;left:50%;bottom:calc(96px + env(safe-area-inset-bottom, 0px));transform:translateX(-50%);width:min(392px,calc(100% - 24px));z-index:50;display:flex;flex-direction:column;gap:8px;pointer-events:none}.toast{background:#1a2332;color:#fff;padding:12px 14px;border-radius:10px;font-size:14px;box-shadow:var(--shadow)}.bottom-nav{position:fixed;left:50%;transform:translateX(-50%);bottom:0;width:100%;max-width:var(--max);display:grid;grid-template-columns:repeat(3,1fr);grid-gap:4px;gap:4px;background:var(--nav);border-top:1px solid var(--border);padding:8px 8px calc(8px + env(safe-area-inset-bottom, 0px));z-index:40}.bottom-nav a{text-decoration:none;color:var(--muted);display:flex;flex-direction:column;align-items:center;gap:4px;font-size:11px;font-weight:600;min-height:52px;justify-content:center}.bottom-nav a.active{color:var(--accent)}.chip{display:inline-flex;align-items:center;justify-content:center;text-align:center;padding:10px 12px;border-radius:999px;border:1px solid var(--border);background:#fff;color:var(--text);font-size:13px;font-weight:600;cursor:pointer;min-height:44px}.chip.selected{border-color:var(--accent);background:#eaf1ff;color:var(--accent)}.chip-grid{display:grid;grid-template-columns:1fr 1fr;grid-gap:10px;gap:10px}.lang-row{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}.lang-pill{border-radius:999px;border:1px solid var(--border);background:#fff;color:var(--text);padding:8px 14px;font-size:13px;font-weight:700;min-height:36px;cursor:pointer}.lang-pill.active{background:var(--accent);border-color:var(--accent);color:#fff}.rag-ask__header{margin-bottom:12px}.rag-ask__form{margin-bottom:20px}.rag-ask__textarea{border-radius:12px;min-height:110px;resize:vertical;line-height:1.45}.rag-ask__row{display:flex;gap:10px;align-items:flex-end}.rag-ask__topk{width:88px;flex-shrink:0}.rag-ask__h2{font-size:16px;margin:20px 0 8px}.rag-ask__badge{display:inline-block;margin:0 0 10px;padding:6px 10px;border-radius:8px;font-size:12px;font-weight:700;background:#fdecea;color:var(--danger)}.rag-ask__badge--ok{background:#e8f5ee;color:#1b7a45}.rag-ask__answer{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:14px 16px;line-height:1.5;white-space:pre-wrap}.rag-ask__sources{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px}.rag-ask__source{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:12px}.rag-ask__source-head{display:flex;flex-wrap:wrap;gap:8px;align-items:baseline;margin-bottom:8px}.rag-ask__source-body{margin:0;white-space:pre-wrap;word-break:break-word;font-family:inherit;font-size:13px;line-height:1.45;color:var(--text);max-height:220px;overflow:auto}.dev-shell{max-width:720px;margin:0 auto;padding:20px 16px 48px}.dev-rag{background:var(--bg-soft);min-height:100dvh}