:root{--bg-gradient: radial-gradient(circle at 10% 20%, #dfeafc 0%, #f2f5ff 35%, #fefcff 100%);--panel-bg: rgba(255, 255, 255, .92);--accent: #3366ff;--accent-soft: rgba(51, 102, 255, .12);--bot-bg: rgba(51, 102, 255, .08);--user-bg: linear-gradient(135deg, #6385ff, #3a53ff);--system-bg: rgba(0, 0, 0, .04);--text-primary: #182034;--text-secondary: #505873;--border-subtle: rgba(24, 32, 52, .08);--shadow-soft: 0 24px 45px rgba(15, 35, 95, .08);--shadow-card: 0 18px 30px rgba(12, 28, 70, .12);--radius-lg: 28px;--radius-md: 18px;--radius-sm: 12px;font-family:Pretendard,Inter,Segoe UI,sans-serif}*,*:before,*:after{box-sizing:border-box}html,body{margin:0;background:var(--bg-gradient);color:var(--text-primary);min-height:100vh}body{display:flex;align-items:center;justify-content:center}.app-wrapper{width:100%;padding:clamp(24px,5vw,48px)}.app-shell{width:min(1200px,100%);margin:0 auto;display:grid;grid-template-columns:320px 1fr;gap:0;border-radius:var(--radius-lg);background:var(--panel-bg);box-shadow:var(--shadow-soft);overflow:hidden;-webkit-backdrop-filter:blur(22px);backdrop-filter:blur(22px);border:1px solid rgba(255,255,255,.4)}.brand-panel{background:#172c5aeb;color:#f5f7ff;padding:36px 32px;display:flex;flex-direction:column;gap:24px}.brand-card{background:#ffffff1a;border-radius:var(--radius-md);padding:24px;box-shadow:inset 0 0 0 1px #ffffff29;display:flex;flex-direction:column;gap:16px}.badge{align-self:flex-start;background:#ffffff2e;border-radius:999px;padding:6px 14px;font-size:12px;letter-spacing:.4px;text-transform:uppercase}.brand-card h1{margin:0;font-size:28px;font-weight:600}.brand-card p{margin:0;line-height:1.6;color:#f5f7ffcc}.brand-meta{margin:0;display:grid;grid-template-columns:1fr;gap:12px}.brand-meta dt{font-size:12px;text-transform:uppercase;letter-spacing:.6px;color:#f5f7ff99;margin-bottom:4px}.brand-meta dd{margin:0;font-size:14px;font-weight:600}.primary-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 18px;background:linear-gradient(135deg,#5a7dff,#3357ff);color:#fff;border:none;border-radius:14px;font-size:15px;font-weight:600;cursor:pointer;transition:transform .18s ease,box-shadow .18s ease,filter .18s ease;box-shadow:0 14px 28px #3357ff47}.primary-btn:disabled{cursor:not-allowed;filter:grayscale(.4);box-shadow:none;opacity:.7}.primary-btn:not(:disabled):hover{transform:translateY(-2px);box-shadow:0 22px 34px #3357ff52}.tips-card{background:#ffffff1a;border-radius:var(--radius-md);padding:24px;display:flex;flex-direction:column;gap:12px}.tips-card h2{margin:0;font-size:18px;font-weight:600}.tips-card ul{margin:0;padding-left:20px;color:#f5f7ffc7;line-height:1.6;font-size:14px}.chat-panel{background:#fdfdff;display:flex;flex-direction:column}.chat-header{display:flex;align-items:flex-start;justify-content:space-between;padding:32px clamp(20px,5vw,38px) 24px;border-bottom:1px solid var(--border-subtle)}.chat-header h2{margin:0;font-size:24px;font-weight:600}.chat-header p{margin:6px 0 0;color:var(--text-secondary);font-size:14px}.status-pill{align-self:flex-start;padding:6px 14px;border-radius:999px;font-size:13px;font-weight:600;background:#0f163414;color:var(--text-secondary)}.status-pill.online{background:#2ec9622e;color:#1a7a42}.status-pill.ready{background:#3366ff26;color:#2d49b9}.status-pill.loading{background:#ffc8502e;color:#8c6117}.status-pill.error{background:#ff638433;color:#b3203d}.chat-history{flex:1;padding:clamp(20px,4vw,32px);overflow-y:auto;display:flex;flex-direction:column;gap:18px;background:linear-gradient(180deg,#fffc,#f8f9fee6)}.chat-history::-webkit-scrollbar{width:8px}.chat-history::-webkit-scrollbar-thumb{background:#0f235f2e;border-radius:999px}.empty-state{margin:0 auto;text-align:center;padding:48px 32px;max-width:480px;background:#fff;border-radius:var(--radius-md);box-shadow:var(--shadow-card);border:1px solid rgba(51,102,255,.08)}.empty-state h3{margin:0 0 8px;font-size:20px}.empty-state p{margin:0;color:var(--text-secondary)}.message{display:flex;gap:12px;align-items:flex-start;animation:fadeInUp .28s ease}.message.user{justify-content:flex-end;text-align:right}.message.user .avatar{order:2}.message.user .bubble{background:var(--user-bg);color:#fff;box-shadow:0 16px 32px #3f62ff40}.message.bot .bubble{background:var(--bot-bg);color:var(--text-primary)}.message.system{justify-content:center}.message.system .avatar{display:none}.message.system .bubble{background:var(--system-bg);color:var(--text-secondary);text-align:center}.avatar{width:36px;height:36px;border-radius:12px;background:#fff;display:flex;align-items:center;justify-content:center;font-size:18px;box-shadow:0 8px 18px #1820341f}.bubble{max-width:min(560px,80%);padding:16px 18px 12px;border-radius:18px;background:#fff;box-shadow:0 18px 28px #1820341f;position:relative}.bubble-text{line-height:1.6;font-size:15px;white-space:pre-wrap}.timestamp{margin-top:8px;font-size:12px;opacity:.6;text-align:right}.chat-composer{padding:clamp(18px,4vw,28px);border-top:1px solid var(--border-subtle);display:flex;flex-direction:column;gap:16px}.composer-card{background:#fff;border-radius:var(--radius-md);box-shadow:var(--shadow-card);border:1px solid rgba(24,32,52,.06);padding:18px;display:flex;flex-direction:column;gap:12px}textarea{width:100%;border:none;resize:none;font-size:15px;line-height:1.6;outline:none;color:var(--text-primary)}textarea:disabled{background:#1820340a;color:#18203473}.composer-actions{display:flex;align-items:center;justify-content:space-between}.send-btn{padding:12px 18px;border-radius:12px;border:none;background:var(--accent);color:#fff;font-weight:600;font-size:14px;cursor:pointer;transition:transform .18s ease,box-shadow .18s ease;box-shadow:0 12px 24px #3366ff3d}.send-btn:disabled{opacity:.6;cursor:not-allowed;box-shadow:none}.send-btn:not(:disabled):hover{transform:translateY(-2px)}.hint{font-size:12px;color:var(--text-secondary)}.audio-player{width:100%;border-radius:14px;background:#3366ff14;padding:6px}@keyframes fadeInUp{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}@media (max-width: 1024px){.app-shell{grid-template-columns:1fr}.brand-panel{padding:28px 24px}}@media (max-width: 720px){.chat-header{flex-direction:column;gap:12px;align-items:flex-start}.message{flex-direction:column;align-items:stretch}.message.user{align-items:stretch;text-align:left}.message.user .avatar{order:0;align-self:flex-start}.message.user .bubble{background:var(--bot-bg);color:var(--text-primary);box-shadow:var(--shadow-card)}}