/* ── Reset & base ─────────────────────────────────────────── */
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: background-color .2s ease, color .2s ease;
}

:root {
  --navy: #0f2544;
  --navy-dark: #0a1a30;
  --gold: #c9a227;
  --gold-light: #e8cf7a;
  --danger: #b3261e;
  --radius: 14px;

  /* Light theme (default) */
  --bg: #f2f4f7;
  --text: #1c2430;
  --heading: var(--navy);
  --muted: #667085;
  --surface: #ffffff;
  --surface-border: #e4e7ec;
  --surface-alt: #e9ecef;
  --bubble-user: var(--navy);
  --bubble-bot: #ffffff;
  --code-bg: #f2f4f7;
  --input-bg: #ffffff;
  --input-border: #d0d5dd;
  --sources-bg: #fbf8ee;
  --sources-border: #eee0b0;
  --sources-accent: #8a6d1c;
  --sources-link: #0f2544;
  --danger-bg: #fceaea;
  --danger-border: #f3c8c6;
  --overlay: rgba(10, 26, 48, 0.55);
}

[data-theme="dark"] {
  --bg: #0b1220;
  --text: #e5e9f0;
  --heading: var(--gold-light);
  --muted: #8a94a8;
  --surface: #16202f;
  --surface-border: #2a3648;
  --surface-alt: #223044;
  --bubble-user: #1a3a63;
  --bubble-bot: #16202f;
  --code-bg: #0f1722;
  --input-bg: #131b28;
  --input-border: #2a3648;
  --sources-bg: #241f12;
  --sources-border: #4a3d1c;
  --sources-accent: #e8cf7a;
  --sources-link: #e8cf7a;
  --danger-bg: #3a1a18;
  --danger-border: #5c2622;
  --overlay: rgba(0, 4, 12, 0.65);
}

a { color: inherit; }
button { font-family: inherit; cursor: pointer; }

/* ── Theme toggle ─────────────────────────────────────────── */
.theme-toggle {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255,255,255,0.3);
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.85rem;
}
.theme-toggle:hover { background: rgba(255,255,255,0.1); }
.theme-fab {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 10;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--surface-border);
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 0.85rem;
  box-shadow: 0 4px 14px rgba(0,0,0,0.15);
}
.theme-fab:hover { opacity: 0.85; }

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
  border: none;
  border-radius: 10px;
  padding: 10px 18px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: opacity .15s ease, transform .05s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.btn:active { transform: scale(0.98); }
.btn-block { width: 100%; }
.btn-primary { background: var(--navy); color: #fff; }
.btn-primary:hover { opacity: 0.9; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { opacity: 0.9; }
.btn-ghost { background: var(--surface-alt); color: var(--text); }
.btn-ghost:hover { opacity: 0.85; }

/* ── Login page ───────────────────────────────────────────── */
.login-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100%;
  background: linear-gradient(160deg, var(--navy) 0%, var(--navy-dark) 100%);
  padding: 20px;
}
.login-card {
  background: var(--surface);
  color: var(--text);
  width: 100%;
  max-width: 380px;
  border-radius: var(--radius);
  padding: 32px 28px 24px;
  box-shadow: 0 20px 50px rgba(0,0,0,0.25);
}
.brand { text-align: center; margin-bottom: 20px; }
.brand-badge {
  display: block;
  width: 56px; height: 56px;
  margin: 0 auto 10px;
}
.brand h1 { margin: 0; font-size: 1.6rem; color: var(--heading); }
.subtitle { margin: 2px 0 0; color: var(--muted); font-size: 0.9rem; }

.login-form { display: flex; flex-direction: column; gap: 6px; }
.login-form label { font-size: 0.85rem; font-weight: 600; margin-top: 10px; color: var(--text); }
.login-form input {
  padding: 10px 12px;
  border: 1px solid var(--input-border);
  border-radius: 8px;
  font-size: 0.95rem;
  background: var(--input-bg);
  color: var(--text);
}
.login-form input:focus { outline: 2px solid var(--gold); border-color: var(--gold); }
.login-form .btn { margin-top: 20px; }

.alert { padding: 10px 12px; border-radius: 8px; font-size: 0.9rem; margin-bottom: 10px; }
.alert-error { background: var(--danger-bg); color: var(--danger); border: 1px solid var(--danger-border); }

.login-footer { text-align: center; margin-top: 20px; color: var(--muted); }

/* ── Top bar ──────────────────────────────────────────────── */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--navy);
  color: #fff;
  padding: 10px 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}
.brand-mini { display: flex; align-items: center; gap: 10px; }
.brand-mini .brand-badge { width: 38px; height: 38px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-weight: 700; font-size: 1.1rem; }
.brand-subtitle { font-size: 0.72rem; color: var(--gold-light); }

.menu { display: flex; gap: 8px; }
.menu-item {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255,255,255,0.3);
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.85rem;
}
.menu-item:hover { background: rgba(255,255,255,0.1); }
.menu-item-danger { border-color: rgba(230, 130, 120, 0.6); color: #ffb4ac; }

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  background: transparent;
  border: none;
  width: 32px; height: 32px;
}
.menu-toggle span {
  display: block;
  height: 2px;
  background: #fff;
  border-radius: 2px;
}

/* ── Chat ─────────────────────────────────────────────────── */
.chat-container {
  display: flex;
  flex-direction: column;
  max-width: 860px;
  margin: 0 auto;
  min-height: calc(100vh - 130px);
  padding: 16px 16px 0;
}
.chat-log {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding-bottom: 16px;
}

.msg { display: flex; flex-direction: column; max-width: 78%; min-width: 0; }
.msg-user { align-self: flex-end; align-items: flex-end; }
.msg-bot { align-self: flex-start; align-items: flex-start; }

.bubble {
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 0.95rem;
  line-height: 1.5;
  word-wrap: break-word;
  overflow-wrap: break-word;
  min-width: 0;
  max-width: 100%;
}
.msg-user .bubble { background: var(--bubble-user); color: #fff; border-bottom-right-radius: 4px; }
.msg-bot .bubble { background: var(--bubble-bot); color: var(--text); border: 1px solid var(--surface-border); border-bottom-left-radius: 4px; }

.bubble p:first-child { margin-top: 0; }
.bubble p:last-child { margin-bottom: 0; }
.bubble code { background: var(--code-bg); padding: 1px 5px; border-radius: 4px; font-size: 0.85em; }
.bubble pre { background: var(--code-bg); padding: 10px; border-radius: 8px; overflow-x: auto; }

.msg-name { font-size: 0.72rem; color: var(--muted); margin: 4px 6px 0; }

.sources {
  margin-top: 8px;
  background: var(--sources-bg);
  border: 1px solid var(--sources-border);
  border-radius: 10px;
  padding: 8px 12px;
  font-size: 0.82rem;
  max-width: 100%;
}
.sources summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--sources-accent);
  padding: 6px 2px;
  user-select: none;
}
.sources ol { margin: 6px 0 2px; padding-left: 22px; }
.sources li { margin-bottom: 2px; }
.sources li a {
  display: block;
  color: var(--sources-link);
  text-decoration: underline;
  text-underline-offset: 2px;
  padding: 10px 6px;
  word-break: break-word;
}
.sources li a:hover,
.sources li a:focus-visible { color: var(--gold); }

.typing { display: flex; gap: 4px; padding: 6px 4px; }
.typing span {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--muted);
  animation: blink 1.2s infinite ease-in-out;
}
.typing span:nth-child(2) { animation-delay: 0.2s; }
.typing span:nth-child(3) { animation-delay: 0.4s; }
@keyframes blink { 0%, 80%, 100% { opacity: 0.2; } 40% { opacity: 1; } }

/* ── Input bar ────────────────────────────────────────────── */
.chat-input-bar {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding: 12px 0 16px;
  position: sticky;
  bottom: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0) 0%, var(--bg) 30%);
}
.chat-input-bar textarea {
  flex: 1;
  resize: none;
  border: 1px solid var(--input-border);
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 0.95rem;
  font-family: inherit;
  max-height: 140px;
  background: var(--input-bg);
  color: var(--text);
}
.chat-input-bar textarea:focus { outline: 2px solid var(--gold); border-color: var(--gold); }
.chat-input-bar .btn {
  flex-shrink: 0;
  height: 44px;
}

/* ── Footer ───────────────────────────────────────────────── */
.app-footer {
  text-align: center;
  padding: 10px;
  color: var(--muted);
  font-size: 0.78rem;
}

/* ── Modals ───────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 50;
  padding: 16px;
}
.modal-overlay.open { display: flex; }
.modal-box {
  background: var(--surface);
  color: var(--text);
  border-radius: var(--radius);
  max-width: 480px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  padding: 24px 24px 20px;
  box-shadow: 0 24px 60px rgba(0,0,0,0.3);
}
.modal-box-small { max-width: 380px; }
.modal-box h2 { margin-top: 0; color: var(--heading); }
.modal-version { color: var(--gold); font-weight: 600; margin-top: -8px; }
.modal-body h3 { font-size: 0.95rem; margin-bottom: 6px; color: var(--text); }
.modal-body ul { padding-left: 18px; }
.modal-box .disclaimer { font-size: 0.78rem; color: var(--muted); margin-top: 16px; }
.modal-actions { display: flex; gap: 10px; margin-top: 16px; }
.modal-actions .btn { flex: 1; }

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 640px) {
  .menu-toggle { display: flex; }
  .menu {
    position: absolute;
    top: 100%;
    right: 12px;
    background: var(--navy);
    flex-direction: column;
    padding: 10px;
    border-radius: 10px;
    display: none;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    min-width: 200px;
  }
  .menu.open { display: flex; }
  .msg { max-width: 90%; }
  .chat-container { padding: 12px 10px 0; }
}