:root{--color-bg: #faf8f5;--color-card: #ffffff;--color-primary: #2d6a4f;--color-primary-hover: #1b4332;--color-accent: #e9c46a;--color-text: #2b2b2b;--color-text-muted: #6b6b6b;--color-border: #e5e0d8;--radius: 12px;font-family:Segoe UI,system-ui,-apple-system,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--color-bg);color:var(--color-text)}a{color:var(--color-primary);text-decoration:none}.container{max-width:960px;margin:0 auto;padding:24px 20px}.navbar{display:flex;align-items:center;justify-content:space-between;padding:16px 24px;background:var(--color-card);border-bottom:1px solid var(--color-border)}.brand{font-weight:700;font-size:1.25rem;color:var(--color-primary)}.card{background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius);padding:20px;margin-bottom:16px}.card:hover{border-color:var(--color-primary)}button,.btn{display:inline-block;background:var(--color-primary);color:#fff;border:none;padding:10px 18px;border-radius:8px;font-size:.95rem;cursor:pointer}button:hover,.btn:hover{background:var(--color-primary-hover)}button:disabled{background:#ccc;cursor:not-allowed}button.secondary{background:transparent;color:var(--color-primary);border:1px solid var(--color-primary)}input,textarea,select{width:100%;padding:10px 12px;border:1px solid var(--color-border);border-radius:8px;font-size:.95rem;margin-bottom:12px;font-family:inherit}.form-narrow{max-width:380px;margin:60px auto}h1,h2,h3{color:var(--color-text)}.muted{color:var(--color-text-muted);font-size:.9rem}.error-text{color:#b91c1c;font-size:.9rem;margin-bottom:12px}.chat-window{display:flex;flex-direction:column;gap:12px;min-height:300px;max-height:60vh;overflow-y:auto;padding:16px;background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius);margin-bottom:12px}.message{padding:10px 14px;border-radius:10px;max-width:80%;white-space:pre-wrap;line-height:1.4}.message.student{background:var(--color-primary);color:#fff;align-self:flex-end}.message.tutor{background:#f1efe9;align-self:flex-start}.message .source{display:block;margin-top:6px;font-size:.8rem;opacity:.7}.chat-input-row{display:flex;gap:8px}.chat-input-row input{margin-bottom:0}.badge{display:inline-block;padding:2px 10px;border-radius:999px;font-size:.75rem;background:var(--color-accent);color:#4a3c00}