:root {
  --ink: #12181f; --ink-soft: #5a6472; --accent: #2563eb; --accent-dark: #1d4ed8;
  --border: #dde3ec; --cream: #f7f9fc; --white: #ffffff; --danger: #d64545;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--cream); color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
.btn { padding: 0.7rem 1.2rem; border: 1px solid var(--accent); background: var(--accent); color: #fff; font-size: 0.95rem; cursor: pointer; border-radius: 6px; }
.btn:hover { background: var(--accent-dark); }
.btn-ghost { background: transparent; color: var(--ink-soft); border-color: var(--border); }
.btn-small { padding: 0.4rem 0.8rem; font-size: 0.8rem; }

.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 1rem; }
.login-card { background: var(--white); border: 1px solid var(--border); border-radius: 10px; padding: 2rem; width: 100%; max-width: 340px; display: flex; flex-direction: column; gap: 1rem; }
.login-card h1 { font-size: 1.4rem; margin: 0; }
.login-card .lede { margin: -0.5rem 0 0; color: var(--ink-soft); font-size: 0.9rem; }

label { display: flex; flex-direction: column; gap: 0.3rem; font-size: 0.85rem; color: var(--ink-soft); }
input { padding: 0.7rem 0.8rem; border: 1px solid var(--border); border-radius: 6px; font-size: 1rem; font-family: inherit; background: var(--white); color: var(--ink); }
.error { color: var(--danger); font-size: 0.85rem; margin: 0; min-height: 1.1em; }

/* ---------- Chat ---------- */
.chat-body { display: flex; flex-direction: column; height: 100dvh; }

.chat-header {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 0.9rem 1rem; background: var(--white); border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.chat-title { font-weight: 700; font-size: 1.05rem; }
.chat-user { margin-left: auto; color: var(--ink-soft); font-size: 0.85rem; }

.chat-messages {
  flex: 1; overflow-y: auto; padding: 1rem;
  display: flex; flex-direction: column; gap: 0.6rem;
}

.msg {
  max-width: 85%; padding: 0.7rem 0.9rem; border-radius: 12px;
  font-size: 0.95rem; line-height: 1.4; white-space: pre-wrap;
}
.msg-user { align-self: flex-end; background: var(--accent); color: #fff; border-bottom-right-radius: 3px; }
.msg-bot { align-self: flex-start; background: var(--white); border: 1px solid var(--border); border-bottom-left-radius: 3px; }
.msg-bot-note { align-self: flex-start; background: transparent; border: none; color: var(--ink-soft); font-size: 0.8rem; font-style: italic; padding: 0 0.9rem; }

.msg-pages { display: flex; flex-wrap: wrap; gap: 0.6rem; margin: 0.2rem 0 0.6rem; }
.page-thumb {
  display: flex; flex-direction: column; gap: 0.3rem; text-decoration: none; color: var(--ink-soft);
  font-size: 0.75rem; width: 130px;
}
.page-thumb img {
  width: 100%; height: 160px; object-fit: cover; border: 1px solid var(--border); border-radius: 6px; background: var(--white);
}

.chat-form {
  display: flex; gap: 0.5rem; padding: 0.75rem; background: var(--white); border-top: 1px solid var(--border);
  flex-shrink: 0;
}
.chat-form input { flex: 1; }