:root{--color-bg: #0f172a;--color-surface: #1e293b;--color-border: #334155;--color-text: #e2e8f0;--color-text-muted: #94a3b8;--color-accent: #38bdf8;--color-accent-hover: #7dd3fc;--max-width: 960px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:system-ui,-apple-system,sans-serif;background:var(--color-bg);color:var(--color-text);line-height:1.6;min-height:100vh;display:flex;flex-direction:column}.banner{width:100%;background:var(--color-surface);text-align:center}.banner a{display:block}.banner-img{width:100%;height:auto;display:block;object-fit:cover}header{border-bottom:1px solid var(--color-border);padding:1rem 2rem}nav{max-width:var(--max-width);margin:0 auto;display:flex;justify-content:space-between;align-items:center}.nav-links{display:flex;gap:1.5rem;align-items:center}.nav-links a{color:var(--color-text-muted);text-decoration:none;transition:color .2s}.nav-links 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button{background:none;border:none;color:var(--color-bg);font-size:1.3rem;cursor:pointer;line-height:1}#chat-messages{flex:1;overflow-y:auto;padding:1rem;display:flex;flex-direction:column;gap:.5rem;min-height:200px;max-height:340px}.chat-msg{padding:.5rem .75rem;border-radius:8px;max-width:85%;word-wrap:break-word;line-height:1.4}.chat-msg.bot{background:var(--color-border);color:var(--color-text);align-self:flex-start}.chat-msg.bot p{margin:.3em 0}.chat-msg.bot p:first-child{margin-top:0}.chat-msg.bot p:last-child{margin-bottom:0}.chat-msg.bot code{background:#0000004d;padding:.1em .35em;border-radius:3px;font-size:.85em}.chat-msg.bot pre{background:#0000004d;padding:.5em;border-radius:4px;overflow-x:auto;margin:.4em 0;font-size:.85em}.chat-msg.bot pre code{background:none;padding:0}.chat-msg.bot ul,.chat-msg.bot ol{margin:.3em 0;padding-left:1.4em}.chat-msg.bot table{border-collapse:collapse;margin:.3em 0;font-size:.85em}.chat-msg.bot th,.chat-msg.bot td{border:1px solid 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