:root{--bg-void:#0b0b0c;--bg-panel:#141416;--bg-elevated:#1c1c1f;--bg-input:#121214;--chrome:#c8ccd2;--chrome-bright:#e8eaed;--chrome-dim:#8b909a;--accent-red:#c8102e;--accent-red-soft:rgba(200,16,46,0.15);--border:rgba(200,204,210,0.12);--border-strong:rgba(200,204,210,0.22);--safe:#2f9e6b;--caution:#d4a017;--stop:#c8102e;--radius:14px;--shadow:0 12px 40px rgba(0,0,0,0.45);--font:"Segoe UI","Noto Sans JP","Hiragino Sans","Helvetica Neue",Arial,sans-serif}*,:after,:before{box-sizing:border-box}body,html{margin:0;padding:0;min-height:100%;background:var(--bg-void);color:var(--chrome-bright);font-family:var(--font);-webkit-font-smoothing:antialiased}body{background-image:radial-gradient(ellipse 80% 50% at 50% -20%,rgba(200,16,46,.12),transparent),radial-gradient(ellipse 60% 40% at 100% 0,rgba(200,204,210,.06),transparent);background-attachment:fixed}a{color:inherit;text-decoration:none}button,input,textarea{font:inherit}.app-shell{min-height:100dvh;max-width:720px;margin:0 auto;border-left:1px solid var(--border);border-right:1px solid var(--border);background:linear-gradient(180deg,rgba(20,20,22,.95),rgba(11,11,12,.98));box-shadow:var(--shadow)}.app-shell,.navbar{display:flex;flex-direction:column}.navbar{position:-webkit-sticky;position:sticky;top:0;z-index:50;gap:.75rem;padding:.85rem 1rem .9rem;background:rgba(12,12,14,.92);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}.navbar-top{justify-content:space-between;gap:.75rem}.brand,.navbar-top{display:flex;align-items:center}.brand{gap:.7rem;min-width:0}.brand-logo{width:42px;height:42px;border-radius:10px;object-fit:cover;border:1px solid var(--border-strong);background:#000;flex-shrink:0}.brand-text{min-width:0}.brand-name{font-size:.95rem;font-weight:650;letter-spacing:.02em;color:var(--chrome-bright);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.brand-tagline{font-size:.72rem;color:var(--chrome-dim);letter-spacing:.04em;text-transform:uppercase}.lang-toggle{display:inline-flex;align-items:stretch;border:1px solid var(--border-strong);border-radius:999px;overflow:hidden;background:var(--bg-elevated);flex-shrink:0}.lang-toggle button{border:none;background:transparent;color:var(--chrome-dim);padding:.4rem .85rem;font-size:.8rem;font-weight:600;cursor:pointer;transition:background .15s,color .15s}.lang-toggle button:hover{color:var(--chrome-bright)}.lang-toggle button.active{background:var(--accent-red);color:#fff}.navbar-meta{display:flex;align-items:center;justify-content:space-between;gap:.5rem;font-size:.75rem;color:var(--chrome-dim)}.skill-pill{display:inline-flex;align-items:center;gap:.35rem;padding:.25rem .65rem;border-radius:999px;border:1px solid var(--border);background:var(--bg-panel);color:var(--chrome)}.skill-pill:before{content:"";width:6px;height:6px;border-radius:50%;background:var(--safe);box-shadow:0 0 8px var(--safe)}.chat-main{min-height:0}.chat-main,.messages{flex:1 1;display:flex;flex-direction:column}.messages{overflow-y:auto;padding:1.1rem 1rem 1.25rem;gap:1rem}.welcome-card{border:1px solid var(--border);border-radius:var(--radius);background:linear-gradient(135deg,rgba(200,16,46,.08),transparent 45%),var(--bg-panel);padding:1.15rem 1.1rem}.welcome-card h1{margin:0 0 .45rem;font-size:1.15rem;font-weight:650;color:var(--chrome-bright)}.welcome-card p{margin:0;color:var(--chrome-dim);line-height:1.55;font-size:.92rem}.message-row{display:flex;flex-direction:column;gap:.35rem;max-width:92%}.message-row.user{align-self:flex-end;align-items:flex-end}.message-row.assistant{align-self:flex-start;align-items:flex-start}.message-label{font-size:.68rem;color:var(--chrome-dim);letter-spacing:.04em;text-transform:uppercase}.bubble{padding:.75rem .95rem;border-radius:14px;line-height:1.55;font-size:.95rem;white-space:pre-wrap;word-break:break-word}.message-row.user .bubble{background:var(--accent-red-soft);border:1px solid rgba(200,16,46,.35);border-right:3px solid var(--accent-red);color:var(--chrome-bright);border-radius:14px 14px 4px 14px}.message-row.assistant .bubble{background:var(--bg-elevated);border:1px solid var(--border-strong);color:var(--chrome);border-radius:14px 14px 14px 4px}.vehicle-chip{margin:0 1rem;padding:.55rem .8rem;border-radius:10px;border:1px solid var(--border);background:var(--bg-panel);font-size:.82rem;color:var(--chrome);display:flex;flex-wrap:wrap;gap:.35rem .75rem;align-items:center}.vehicle-chip strong{color:var(--chrome-bright);font-weight:600}.vehicle-chip .muted{color:var(--chrome-dim)}.diagnosis-card{margin-top:.5rem;border-radius:var(--radius);border:1px solid var(--border-strong);background:var(--bg-panel);overflow:hidden;width:min(100%,420px)}.diagnosis-card.severity-safe_to_drive{border-color:rgba(47,158,107,.45)}.diagnosis-card.severity-caution{border-color:rgba(212,160,23,.45)}.diagnosis-card.severity-stop_immediately{border-color:rgba(200,16,46,.65);box-shadow:0 0 0 1px rgba(200,16,46,.2)}.diagnosis-header{display:flex;align-items:center;justify-content:space-between;gap:.5rem;padding:.75rem .9rem;border-bottom:1px solid var(--border);background:rgba(0,0,0,.25)}.diagnosis-header h3{margin:0;font-size:.85rem;font-weight:650;letter-spacing:.03em;text-transform:uppercase;color:var(--chrome-dim)}.severity-badge{font-size:.72rem;font-weight:700;padding:.28rem .55rem;border-radius:999px;letter-spacing:.02em}.severity-badge.safe_to_drive{background:rgba(47,158,107,.18);color:#5ddeb0}.severity-badge.caution{background:rgba(212,160,23,.18);color:#f0c14b}.severity-badge.stop_immediately{background:rgba(200,16,46,.22);color:#ff6b81}.diagnosis-body{padding:.85rem .9rem 1rem;gap:.85rem}.cause-row,.diagnosis-body{display:flex;flex-direction:column}.cause-row{gap:.3rem}.cause-top{display:flex;justify-content:space-between;gap:.5rem;font-size:.9rem}.cause-top span:last-child{color:var(--chrome-dim);font-feature-settings:"tnum";font-variant-numeric:tabular-nums;flex-shrink:0}.bar{height:6px;background:rgba(255,255,255,.06);overflow:hidden}.bar,.bar>i{border-radius:999px}.bar>i{display:block;height:100%;background:linear-gradient(90deg,var(--accent-red),#e85a4f)}.meta-block{font-size:.88rem;color:var(--chrome)}.meta-block label{display:block;font-size:.7rem;text-transform:uppercase;letter-spacing:.05em;color:var(--chrome-dim);margin-bottom:.2rem}.disclaimer{font-size:.72rem;color:var(--chrome-dim);line-height:1.45;padding-top:.65rem}.composer,.disclaimer{border-top:1px solid var(--border)}.composer{background:rgba(12,12,14,.95);padding:.75rem 1rem 1rem;display:flex;flex-direction:column;gap:.55rem}.composer-row{display:flex;gap:.5rem;align-items:flex-end}.composer textarea{flex:1 1;resize:none;min-height:48px;max-height:140px;padding:.7rem .85rem;border-radius:12px;border:1px solid var(--border-strong);background:var(--bg-input);color:var(--chrome-bright);outline:none}.composer textarea:focus{border-color:rgba(200,16,46,.55);box-shadow:0 0 0 3px var(--accent-red-soft)}.composer textarea::placeholder{color:var(--chrome-dim)}.btn{border:none;cursor:pointer;border-radius:12px;padding:.7rem 1rem;font-weight:650;font-size:.9rem;transition:opacity .15s,transform .1s}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--accent-red);color:#fff;min-width:5.5rem}.btn-primary:not(:disabled):hover{filter:brightness(1.08)}.btn-ghost{background:transparent;color:var(--chrome-dim);border:1px solid var(--border);padding:.4rem .7rem;font-size:.78rem;border-radius:999px}.btn-ghost:hover{color:var(--chrome-bright);border-color:var(--border-strong)}.composer-tools{display:flex;flex-wrap:wrap;gap:.4rem;align-items:center}.footer-bar{padding:.55rem 1rem .85rem;font-size:.68rem;color:var(--chrome-dim);text-align:center;line-height:1.45;border-top:1px solid var(--border)}.error-banner{margin:0 1rem;padding:.6rem .75rem;border-radius:10px;background:rgba(200,16,46,.12);border:1px solid rgba(200,16,46,.35);color:#ff8a9a;font-size:.85rem}.typing{color:var(--chrome-dim);font-size:.85rem;padding:0 .25rem}@media (max-width:480px){.brand-name{font-size:.85rem}.lang-toggle button{padding:.38rem .65rem;font-size:.75rem}.message-row{max-width:100%}}