/* ============================================
   IAM Local 2909 — Virtual Steward Stylesheet
   Brand Guidelines: IAM 2025 Rev 05/07/25
   ============================================ */

/* --- CSS Custom Properties (IAM Brand) --- */
:root {
  --union-blue: #0F4C8B;
  --union-red: #D52029;
  --dark-blue: #102042;
  --dark-red: #991F1F;
  --mid-blue: #006CAF;
  --sky-blue: #4FA9DF;
  --light-blue: #E5F4FB;
  --gray: #E6DFE0;
  --teal: #269993;
  --white: #FFFFFF;
  --off-white: #F8F9FA;
  --text-dark: #1A1A1A;
  --text-medium: #444444;
  --text-light: #666666;
  --error: #C0392B;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.12);
  --radius: 4px;
  --transition: 0.3s ease;
  --font-base: 18px;
}

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-base);
  scroll-behavior: smooth;
}

body {
  font-family: 'Roboto', Arial, Helvetica, sans-serif;
  background: var(--off-white);
  color: var(--text-dark);
  line-height: 1.6;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

/* Utility */
.hidden { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ── Font size levels ──────────────────────────────────────────────────────── */
body.font-md { font-size: 22px; }
body.font-lg { font-size: 26px; }

/* ── Auth Overlay ──────────────────────────────────────────────────────────── */
#auth-overlay,
.auth-overlay {
  position: fixed;
  inset: 0;
  background: linear-gradient(135deg, var(--dark-blue) 0%, var(--union-blue) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}

.auth-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  max-width: 480px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.auth-logo {
  font-size: 3rem;
  color: var(--union-blue);
  margin-bottom: 0.5rem;
}

.auth-card h1 {
  font-family: 'Archivo', Arial, Helvetica, sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--union-blue);
  margin-bottom: 0.25rem;
}

.auth-subtitle {
  font-family: 'Archivo', Arial, Helvetica, sans-serif;
  font-size: 1.1rem;
  color: var(--union-red);
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.auth-desc {
  color: var(--text-medium);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

#auth-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

#auth-form input[type="password"] {
  width: 100%;
  padding: 0.85rem 1rem;
  font-size: 1rem;
  font-family: 'Roboto', Arial, Helvetica, sans-serif;
  border: 2px solid var(--gray);
  border-radius: var(--radius);
  outline: none;
  transition: border-color var(--transition);
  color: var(--text-dark);
}

#auth-form input[type="password"]:focus {
  border-color: var(--union-blue);
}

.auth-error {
  color: var(--error);
  font-size: 0.9rem;
  min-height: 1.2em;
}

#auth-btn {
  background: var(--union-blue);
  color: var(--white);
  border: none;
  border-radius: var(--radius);
  padding: 0.9rem;
  font-size: 1.05rem;
  font-weight: 700;
  font-family: 'Roboto', Arial, Helvetica, sans-serif;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  transition: background var(--transition);
}

#auth-btn:hover, #auth-btn:focus-visible {
  background: var(--dark-blue);
  outline: 3px solid var(--union-red);
  outline-offset: 2px;
}

/* ── Classification Picker ────────────────────────────────────────────────── */
.class-options {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  width: 100%;
  margin: 1rem 0;
}

.class-option {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.85rem;
  border: 2px solid var(--gray);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  text-align: left;
}

.class-option:hover {
  border-color: var(--union-blue);
  background: var(--light-blue);
}

.class-option input[type="radio"] {
  margin-top: 0.35rem;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  accent-color: var(--union-blue);
}

.class-option-label {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.class-option-label strong {
  font-family: 'Archivo', Arial, Helvetica, sans-serif;
  font-size: 1.05rem;
  color: var(--text-dark);
  text-transform: uppercase;
}

.class-option-label small {
  font-size: 0.85rem;
  color: var(--text-light);
}

#class-btn {
  background: var(--union-blue);
  color: var(--white);
  border: none;
  border-radius: var(--radius);
  padding: 0.9rem;
  font-size: 1.05rem;
  font-weight: 700;
  font-family: 'Roboto', Arial, Helvetica, sans-serif;
  cursor: pointer;
  width: 100%;
  margin-top: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  transition: background var(--transition);
}

#class-btn:hover, #class-btn:focus-visible {
  background: var(--dark-blue);
  outline: 3px solid var(--union-red);
  outline-offset: 2px;
}

/* ── Session Expired Banner ────────────────────────────────────────────────── */
.session-banner {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: var(--union-red);
  color: var(--white);
  text-align: center;
  padding: 0.75rem 1rem;
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  font-size: 1rem;
  font-weight: 600;
}

.session-banner button {
  background: var(--white);
  color: var(--union-red);
  border: none;
  border-radius: var(--radius);
  padding: 0.4rem 1rem;
  font-size: 0.95rem;
  font-weight: 700;
  font-family: 'Roboto', Arial, Helvetica, sans-serif;
  cursor: pointer;
  text-transform: uppercase;
}

.session-banner button:hover {
  background: var(--off-white);
}

/* ── App Layout ────────────────────────────────────────────────────────────── */
#app {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

/* ── Header ────────────────────────────────────────────────────────────────── */
.site-header {
  background: var(--dark-blue);
  color: var(--white);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-lg);
}

.header-inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.header-title {
  font-family: 'Archivo', Arial, Helvetica, sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.header-logo {
  font-size: 1.4rem;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.font-btn {
  background: rgba(255,255,255,0.15);
  color: var(--white);
  border: 1px solid rgba(255,255,255,0.35);
  border-radius: var(--radius);
  padding: 0.35rem 0.7rem;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: 'Roboto', Arial, Helvetica, sans-serif;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition);
}

.font-btn:hover, .font-btn:focus-visible {
  background: rgba(255,255,255,0.3);
  outline: 2px solid var(--union-red);
  outline-offset: 2px;
}

/* ── Chat Main ─────────────────────────────────────────────────────────────── */
#chat-main {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem 1rem;
  scroll-behavior: smooth;
}

#chat-messages {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* ── Empty State ───────────────────────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--text-medium);
}

.empty-greeting {
  font-family: 'Archivo', Arial, Helvetica, sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--union-blue);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

.empty-hint {
  color: var(--text-light);
  margin-bottom: 1.25rem;
}

.empty-hint-header {
  color: var(--text-light);
  font-size: 0.85rem;
  margin-bottom: 1.25rem;
}

.example-questions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.example-btn {
  background: var(--white);
  color: var(--union-blue);
  border: 2px solid var(--union-blue);
  border-radius: var(--radius);
  padding: 0.65rem 1.25rem;
  font-size: 0.95rem;
  font-family: 'Roboto', Arial, Helvetica, sans-serif;
  cursor: pointer;
  font-weight: 500;
  transition: background var(--transition), color var(--transition);
  text-align: left;
}

.example-btn:hover, .example-btn:focus-visible {
  background: var(--union-blue);
  color: var(--white);
  outline: 3px solid var(--union-red);
  outline-offset: 2px;
}

/* ── Messages ──────────────────────────────────────────────────────────────── */
.message-row {
  display: flex;
  align-items: flex-end;
  gap: 0.5rem;
}

.message-row.user-row {
  flex-direction: row-reverse;
}

.message-avatar {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 700;
  flex-shrink: 0;
}

.user-row .message-avatar {
  background: var(--mid-blue);
  color: var(--white);
}

.bot-row .message-avatar {
  background: var(--union-blue);
  color: var(--white);
}

.message-bubble {
  max-width: 75%;
  padding: 0.9rem 1.1rem;
  border-radius: var(--radius);
  font-size: 1rem;
  line-height: 1.65;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.user-bubble {
  background: var(--light-blue);
  color: var(--text-dark);
  border-bottom-right-radius: 2px;
}

.bot-bubble {
  background: var(--white);
  color: var(--text-dark);
  border: 1px solid var(--gray);
  border-bottom-left-radius: 2px;
}

.message-sources {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-top: 0.5rem;
  font-style: italic;
}

/* Typing indicator */
.typing-bubble {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.9rem 1.1rem;
}

.typing-dot {
  width: 8px; height: 8px;
  background: var(--text-light);
  border-radius: 50%;
  animation: bounce 1.2s infinite ease-in-out;
}

.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
  0%, 80%, 100% { transform: translateY(0); }
  40%            { transform: translateY(-7px); }
}

/* ── Input Area ────────────────────────────────────────────────────────────── */
.input-area {
  background: var(--white);
  border-top: 2px solid var(--gray);
  padding: 0.85rem 1rem;
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
  position: sticky;
  bottom: 0;
  z-index: 50;
}

.input-area textarea {
  flex: 1;
  resize: none;
  border: 2px solid var(--gray);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  font-size: 1rem;
  font-family: 'Roboto', Arial, Helvetica, sans-serif;
  line-height: 1.5;
  color: var(--text-dark);
  background: var(--off-white);
  outline: none;
  transition: border-color var(--transition);
  min-height: 3rem;
  max-height: 9rem;
  overflow-y: auto;
}

.input-area textarea:focus {
  border-color: var(--union-blue);
}

#send-btn {
  background: var(--union-red);
  color: var(--white);
  border: none;
  border-radius: var(--radius);
  padding: 0.75rem 1.4rem;
  font-size: 1rem;
  font-weight: 700;
  font-family: 'Roboto', Arial, Helvetica, sans-serif;
  cursor: pointer;
  transition: background var(--transition);
  white-space: nowrap;
  min-height: 3rem;
  align-self: flex-end;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

#send-btn:hover, #send-btn:focus-visible {
  background: var(--dark-red);
  outline: 3px solid var(--union-blue);
  outline-offset: 2px;
}

#send-btn:disabled {
  background: var(--gray);
  cursor: not-allowed;
}

/* ── Footer ────────────────────────────────────────────────────────────────── */
.site-footer {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-light);
  background: var(--white);
  padding: 0.6rem 1rem;
  border-top: 1px solid var(--gray);
}

/* ── Back to Home Link ─────────────────────────────────────────────────────── */
.back-home {
  text-align: center;
  padding: 0.75rem 1rem;
  background: var(--white);
  border-top: 1px solid var(--gray);
}

.back-home a {
  color: var(--union-blue);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
}

.back-home a:hover {
  color: var(--union-red);
  text-decoration: underline;
}

/* ── Mobile ────────────────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .header-controls {
    gap: 0.35rem;
    flex-shrink: 0;
  }

  .font-btn {
    padding: 0.3rem 0.55rem;
    font-size: 0.8rem;
  }

  .header-inner {
    flex-wrap: wrap;
  }

  .header-title {
    flex-shrink: 0;
    white-space: nowrap;
    font-size: 1rem;
  }

  #suggestions-btn .btn-label,
  #change-class-btn .btn-label,
  #start-over-btn .btn-label {
    display: none;
  }

  .message-bubble {
    max-width: 90%;
    font-size: 0.95rem;
  }

  .example-btn {
    width: 100%;
    text-align: center;
    border-radius: var(--radius);
  }

  .input-area textarea {
    font-size: 1rem;
  }

  #send-btn {
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
  }

  .auth-card {
    padding: 2rem 1.25rem;
  }

  .class-option {
    padding: 0.75rem;
  }
}