:root{color-scheme:light;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:#f6f7fb;color:#111827;font-smoothing:antialiased}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(circle at top,#fff,#e7ecf6 45%,#f6f7fb)}button,input,select,textarea{font:inherit}.page-shell{max-width:1080px;margin:0 auto;padding:32px 24px 64px}.hero-panel{margin-bottom:32px;padding:28px 24px;background:hsla(0,0%,100%,.9);border:1px solid rgba(15,23,42,.08);border-radius:24px;box-shadow:0 24px 64px rgba(15,23,42,.08)}.eyebrow{margin:0 0 8px;text-transform:uppercase;letter-spacing:.16em;color:#2563eb;font-size:.85rem;font-weight:700}h1{margin:0;font-size:clamp(2rem,3vw,3.4rem);line-height:1.05}.description{margin:16px 0 0;max-width:700px;line-height:1.7;color:#475569}.chat-shell{display:grid;grid-gap:24px;gap:24px}.chat-back-button{justify-self:start;border:1px solid rgba(15,23,42,.15);border-radius:999px;background:#fff;color:#0f172a;padding:10px 16px;font-weight:600;cursor:pointer}.chat-back-button:hover{background:#f8fafc}.chat-panel{background:#fff;border:1px solid rgba(15,23,42,.08);border-radius:24px;overflow:hidden;display:flex;flex-direction:column;min-height:640px}.chat-toolbar{display:flex;align-items:center;justify-content:space-between;padding:20px 24px;border-bottom:1px solid rgba(15,23,42,.08);gap:16px}.chat-toolbar h2{margin:0;font-size:1.1rem}.chat-controls{display:flex;gap:12px;flex-wrap:wrap}.chat-controls button,.chat-controls select{border:1px solid rgba(15,23,42,.12);border-radius:12px;padding:10px 14px;background:#f8fafc;color:#0f172a}.chat-area{flex:1 1;padding:20px 24px;overflow-y:auto;display:grid;grid-gap:18px;gap:18px}.message-row{display:flex;gap:16px}.message-bubble{max-width:78%;border-radius:24px;padding:18px 20px;line-height:1.75}.message-role{margin:0 0 10px;font-size:.8rem;font-weight:700;letter-spacing:.02em;text-transform:uppercase;color:#52606d}.message-content h1,.message-content h2,.message-content h3,.message-content h4,.message-content h5,.message-content h6{margin:16px 0 8px;font-weight:600;line-height:1.3}.message-content h1{font-size:1.5em}.message-content h2{font-size:1.3em}.message-content h3{font-size:1.1em}.message-content p{margin:8px 0}.message-content ol,.message-content ul{margin:8px 0;padding-left:20px}.message-content li{margin:4px 0}.message-content code{background:rgba(0,0,0,.1);padding:2px 4px;border-radius:4px;font-family:Monaco,Menlo,Ubuntu Mono,monospace;font-size:.9em}.message-content pre{background:rgba(0,0,0,.05);padding:12px;border-radius:8px;overflow-x:auto;margin:8px 0}.message-content pre code{background:none;padding:0}.message-content blockquote{border-left:4px solid #ddd;padding-left:16px;margin:8px 0;color:#666}.message-content a{color:#2563eb;text-decoration:underline}.message-content strong{font-weight:600}.message-content em{font-style:italic}.message-user{justify-content:flex-end}.message-user .message-bubble{background:#2563eb;color:#fff;border-bottom-right-radius:6px}.message-assistant .message-bubble{background:#f1f5f9;color:#0f172a;border-bottom-left-radius:6px}.chat-footer{padding:20px 24px;border-top:1px solid rgba(15,23,42,.08)}.chat-footer,.input-row{display:grid;grid-gap:12px;gap:12px}textarea{width:100%;min-height:120px;border:1px solid rgba(15,23,42,.12);border-radius:18px;padding:16px 18px;resize:vertical;background:#f8fafc;color:#111827}button:focus,select:focus,textarea:focus{outline:2px solid #2563eb;outline-offset:2px}button.primary{border:none;background:#2563eb;color:#fff;cursor:pointer}button.primary:disabled{opacity:.55;cursor:not-allowed}.platform-chatgpt .message-user .message-bubble{background:#10b981}.platform-deepseek .message-user .message-bubble{background:#7c3aed}.platform-azure .message-assistant .message-bubble{background:#e0f2fe}.platform-azure .message-user .message-bubble{background:#0369a1}@media (max-width:860px){.page-shell{padding:20px 16px 48px}.chat-panel{min-height:560px}}.scenario-picker{background:#fff;border:1px solid rgba(15,23,42,.08);border-radius:24px;padding:40px 32px;box-shadow:0 24px 64px rgba(15,23,42,.08)}.scenario-picker-title{margin:0 0 28px;font-size:1.4rem;font-weight:700;color:#0f172a}.scenario-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));grid-gap:20px;gap:20px}.scenario-card{display:flex;flex-direction:column;align-items:flex-start;text-align:left;background:#f8fafc;border:1.5px solid rgba(15,23,42,.1);border-radius:18px;padding:28px 24px;cursor:pointer;transition:border-color .15s,box-shadow .15s,background .15s}.scenario-card:hover{background:#eff6ff;border-color:#2563eb;box-shadow:0 8px 32px rgba(37,99,235,.1)}.scenario-card-name{margin:0 0 12px;font-size:1.05rem;font-weight:700;color:#0f172a}.scenario-card-desc{margin:0;font-size:.92rem;line-height:1.65;color:#475569}