:root {
    --bg-deep: #0a0e1a;
    --bg-card: #111827;
    --bg-card-hover: #1a2235;
    --bg-chat: #0d1420;
    --accent-gold: #f0b429;
    --accent-gold-dim: rgba(240,180,41,0.15);
    --accent-blue: #3b82f6;
    --accent-blue-dim: rgba(59,130,246,0.12);
    --accent-green: #10b981;
    --accent-green-dim: rgba(16,185,129,0.12);
    --accent-purple: #8b5cf6;
    --accent-purple-dim: rgba(139,92,246,0.12);
    --accent-rose: #f43f5e;
    --accent-rose-dim: rgba(244,63,94,0.12);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #475569;
    --border: rgba(255,255,255,0.07);
    --border-active: rgba(240,180,41,0.4);
    --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
    --shadow-glow: 0 0 40px rgba(240,180,41,0.08);
    --radius: 16px;
    --radius-sm: 10px;
    --font-serif: 'Noto Serif SC', serif;
    --font-sans: 'Noto Sans SC', sans-serif;
  }

  * { margin: 0; padding: 0; box-sizing: border-box; }

  body {
    background: var(--bg-deep);
    color: var(--text-primary);
    font-family: var(--font-sans);
    min-height: 100vh;
    overflow-x: hidden;
  }

  /* ── Background texture ── */
  body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
      radial-gradient(ellipse 80% 50% at 20% 10%, rgba(59,130,246,0.06) 0%, transparent 60%),
      radial-gradient(ellipse 60% 40% at 80% 80%, rgba(240,180,41,0.05) 0%, transparent 60%),
      radial-gradient(ellipse 40% 60% at 50% 50%, rgba(139,92,246,0.03) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
  }

  /* ── Grid overlay ── */
  body::after {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
      linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    z-index: 0;
  }

  /* ── Layout ── */
  #app {
    position: relative;
    z-index: 1;
    min-height: 100vh;
  }

  /* ── Header ── */
  header {
    padding: 24px 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(12px);
    background: rgba(10,14,26,0.8);
    position: sticky;
    top: 0;
    z-index: 100;
  }

  .logo {
    display: flex;
    align-items: center;
    gap: 12px;
  }

  .logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent-gold), #e07b00);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    box-shadow: 0 4px 16px rgba(240,180,41,0.3);
  }

  .logo-text {
    font-family: var(--font-serif);
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.05em;
  }

  .logo-sub {
    font-size: 11px;
    color: var(--text-muted);
    letter-spacing: 0.1em;
    margin-top: 2px;
  }

  .header-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: var(--accent-gold-dim);
    border: 1px solid rgba(240,180,41,0.25);
    border-radius: 20px;
    font-size: 12px;
    color: var(--accent-gold);
    font-weight: 500;
  }

  .pulse-dot {
    width: 6px;
    height: 6px;
    background: var(--accent-green);
    border-radius: 50%;
    animation: pulse 2s infinite;
  }

  .header-user {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 14px 6px 6px;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(240,180,41,0.25);
    border-radius: 30px;
    transition: all 0.3s ease;
  }

  .header-user:hover {
    background: rgba(255,255,255,0.08);
    border-color: rgba(240,180,41,0.45);
    box-shadow: 0 4px 20px rgba(240,180,41,0.15);
  }

  .header-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-gold), #e07b00);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    box-shadow: 0 2px 8px rgba(240,180,41,0.4);
    flex-shrink: 0;
  }

  .header-identity {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
  }

  .header-username {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    max-width: 80px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .header-role-tag {
    font-size: 10px;
    color: var(--accent-gold);
    background: rgba(240,180,41,0.12);
    padding: 1px 6px;
    border-radius: 10px;
    border: 1px solid rgba(240,180,41,0.2);
    letter-spacing: 0.5px;
  }

  .header-logout {
    padding: 5px 12px;
    background: rgba(244,63,94,0.08);
    border: 1px solid rgba(244,63,94,0.2);
    border-radius: 16px;
    font-size: 11px;
    color: #f43f5e;
    cursor: pointer;
    transition: all 0.2s;
    font-family: var(--font-sans);
    white-space: nowrap;
    margin-left: 4px;
  }

  .header-logout:hover {
    background: rgba(244,63,94,0.15);
    border-color: rgba(244,63,94,0.35);
  }

  @keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.8); }
  }

  /* ── Hero ── */
  .hero {
    text-align: center;
    padding: 72px 40px 56px;
    max-width: 800px;
    margin: 0 auto;
  }

  .hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 14px;
    background: var(--accent-blue-dim);
    border: 1px solid rgba(59,130,246,0.2);
    border-radius: 20px;
    font-size: 12px;
    color: var(--accent-blue);
    letter-spacing: 0.08em;
    margin-bottom: 24px;
    font-weight: 500;
  }

  .hero h1 {
    font-family: var(--font-serif);
    font-size: clamp(32px, 5vw, 52px);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #f1f5f9 30%, var(--accent-gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }

  .hero p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    max-width: 560px;
    margin: 0 auto;
  }

  /* ── Stats bar ── */
  .stats-bar {
    display: flex;
    justify-content: center;
    gap: 48px;
    padding: 24px 40px;
    margin-bottom: 8px;
  }

  .stat-item {
    text-align: center;
  }

  .stat-num {
    font-family: var(--font-serif);
    font-size: 28px;
    font-weight: 700;
    color: var(--accent-gold);
    line-height: 1;
  }

  .stat-label {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
    letter-spacing: 0.05em;
  }

  /* ── Departments ── */
  .departments {
    padding: 0 40px 80px;
    max-width: 1400px;
    margin: 0 auto;
  }

  .section-title {
    font-family: var(--font-serif);
    font-size: 14px;
    color: var(--text-muted);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 32px;
    display: flex;
    align-items: center;
    gap: 12px;
  }

  .section-title::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
  }

  .dept-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
  }

  /* ── Onboarding Modal ── */
  .onboarding-overlay {
    position: fixed;
    inset: 0;
    background: rgba(10,14,26,0.95);
    backdrop-filter: blur(16px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    overflow-y: auto;
  }

  .onboarding-overlay.hidden {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s;
  }

  .onboarding-modal {
    width: 100%;
    max-width: 560px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 24px 80px rgba(0,0,0,0.6);
  }

  .onboarding-header {
    padding: 40px 32px 24px;
    text-align: center;
    background: linear-gradient(180deg, rgba(240,180,41,0.08) 0%, transparent 100%);
    border-bottom: 1px solid var(--border);
  }

  .onboarding-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--accent-gold), #e07b00);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    box-shadow: 0 8px 32px rgba(240,180,41,0.3);
  }

  .onboarding-header h2 {
    font-family: var(--font-serif);
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
  }

  .onboarding-header p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
  }

  .onboarding-form {
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 20px;
  }

  .form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
  }

  .form-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 6px;
  }

  .form-hint {
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 400;
  }

  .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .onboarding-form input,
  .onboarding-form select {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px 14px;
    color: var(--text-primary);
    font-size: 14px;
    font-family: var(--font-sans);
    outline: none;
    transition: all 0.2s;
  }

  .onboarding-form input:focus,
  .onboarding-form select:focus {
    border-color: var(--accent-gold);
    background: rgba(255,255,255,0.07);
  }

  .onboarding-form input::placeholder {
    color: var(--text-muted);
  }

  .onboarding-form select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
  }

  .onboarding-form select option {
    background: var(--bg-card);
    color: var(--text-primary);
  }

  /* Subject Tags */
  .subject-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }

  .subject-tag {
    cursor: pointer;
  }

  .subject-tag input {
    display: none;
  }

  .subject-tag span {
    display: block;
    padding: 8px 14px;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-secondary);
    transition: all 0.2s;
  }

  .subject-tag:hover span {
    background: rgba(255,255,255,0.08);
    border-color: rgba(255,255,255,0.12);
  }

  .subject-tag input:checked + span {
    background: var(--accent-gold-dim);
    border-color: var(--accent-gold);
    color: var(--accent-gold);
  }

  .subject-tag.other span {
    background: rgba(139,92,246,0.1);
    border-color: rgba(139,92,246,0.2);
    color: var(--accent-purple);
  }

  .subject-tag.other input:checked + span {
    background: rgba(139,92,246,0.2);
    border-color: var(--accent-purple);
  }

  .other-input {
    margin-top: 8px;
  }

  .onboarding-submit {
    margin-top: 8px;
    padding: 14px 24px;
    background: linear-gradient(135deg, var(--accent-gold), #e07b00);
    border: none;
    border-radius: 12px;
    color: #0a0e1a;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s;
  }

  .onboarding-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(240,180,41,0.3);
  }

  .onboarding-submit .arrow {
    transition: transform 0.2s;
  }

  .onboarding-submit:hover .arrow {
    transform: translateX(4px);
  }

  /* ── User Profile Card ── */
  .user-profile {
    padding: 0 40px 24px;
    max-width: 1400px;
    margin: 0 auto;
    animation: fadeUp 0.5s ease;
  }

  .profile-card {
    background: linear-gradient(135deg, rgba(59,130,246,0.1), rgba(139,92,246,0.1));
    border: 1px solid rgba(59,130,246,0.2);
    border-radius: var(--radius);
    padding: 20px 24px;
    display: flex;
    align-items: center;
    gap: 16px;
  }

  .profile-avatar {
    width: 48px;
    height: 48px;
    background: rgba(59,130,246,0.15);
    border: 1px solid rgba(59,130,246,0.25);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
  }

  .profile-info {
    flex: 1;
  }

  .profile-name {
    font-family: var(--font-serif);
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
  }

  .profile-meta {
    font-size: 13px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .profile-meta .dot {
    color: var(--text-muted);
  }

  .profile-subjects {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 8px;
  }

  .profile-subject-tag {
    padding: 3px 10px;
    background: rgba(59,130,246,0.12);
    border: 1px solid rgba(59,130,246,0.2);
    border-radius: 4px;
    font-size: 11px;
    color: var(--accent-blue);
  }

  .profile-edit {
    padding: 8px 16px;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
  }

  .profile-edit:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.15);
    color: var(--text-primary);
  }

  @media (max-width: 768px) {
    .form-row { grid-template-columns: 1fr; }
    .onboarding-form { padding: 24px; }
    .onboarding-header { padding: 32px 24px 20px; }
    .user-profile { padding: 0 20px 20px; }
    .profile-card { flex-wrap: wrap; }
  }

  /* ── Department Card ── */
  .dept-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
  }

  .dept-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--dept-color, var(--accent-gold));
    opacity: 0;
    transition: opacity 0.3s;
  }

  .dept-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(255,255,255,0.12);
    transform: translateY(-4px);
    box-shadow: var(--shadow-card), 0 0 0 1px rgba(255,255,255,0.05);
  }

  .dept-card:hover::before {
    opacity: 1;
  }

  .dept-card.active {
    border-color: var(--dept-color, var(--accent-gold));
    box-shadow: 0 0 0 1px var(--dept-color, var(--accent-gold)), var(--shadow-card);
  }

  .dept-card.active::before {
    opacity: 1;
  }

  .dept-header {
    padding: 24px 24px 20px;
    display: flex;
    align-items: flex-start;
    gap: 16px;
  }

  .dept-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    flex-shrink: 0;
    background: var(--dept-bg, var(--accent-gold-dim));
    border: 1px solid var(--dept-border, rgba(240,180,41,0.2));
  }

  .dept-info h3 {
    font-family: var(--font-serif);
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
  }

  .dept-info p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
  }

  .dept-employees {
    padding: 0 24px 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
  }

  .employee-chip {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
  }

  .employee-chip:hover {
    background: var(--dept-bg, var(--accent-gold-dim));
    border-color: var(--dept-border, rgba(240,180,41,0.3));
    transform: translateX(4px);
  }

  .employee-avatar {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    background: var(--dept-bg, var(--accent-gold-dim));
    flex-shrink: 0;
  }

  .employee-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    flex: 1;
  }

  .employee-tag {
    font-size: 11px;
    color: var(--text-muted);
    background: rgba(255,255,255,0.05);
    padding: 2px 8px;
    border-radius: 4px;
  }

  .dept-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .dept-count {
    font-size: 12px;
    color: var(--text-muted);
  }

  .dept-cta {
    font-size: 12px;
    color: var(--dept-color, var(--accent-gold));
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 4px;
  }

  /* ── Chat Modal ── */
  .chat-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(8px);
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
  }

  .chat-overlay.open {
    opacity: 1;
    pointer-events: all;
  }

  .chat-modal {
    width: 100%;
    max-width: 720px;
    height: 80vh;
    max-height: 700px;
    background: var(--bg-chat);
    border: 1px solid var(--border);
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 24px 80px rgba(0,0,0,0.6);
    transform: scale(0.95) translateY(20px);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .chat-overlay.open .chat-modal {
    transform: scale(1) translateY(0);
  }

  .chat-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 14px;
    background: rgba(255,255,255,0.02);
  }

  .chat-agent-avatar {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    flex-shrink: 0;
  }

  .chat-agent-info h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
  }

  .chat-agent-info p {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 2px;
  }

  .chat-close {
    margin-left: auto;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: all 0.2s;
  }

  .chat-close:hover {
    background: rgba(255,255,255,0.1);
    color: var(--text-primary);
  }

  /* ── Quick prompts ── */
  .quick-prompts {
    padding: 16px 20px;
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    border-bottom: 1px solid var(--border);
    background: rgba(255,255,255,0.01);
  }

  .quick-btn {
    padding: 6px 12px;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 12px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    font-family: var(--font-sans);
    white-space: nowrap;
  }

  .quick-btn:hover {
    background: var(--agent-bg, var(--accent-gold-dim));
    border-color: var(--agent-border, rgba(240,180,41,0.3));
    color: var(--text-primary);
  }

  /* ── Messages ── */
  .chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    scroll-behavior: smooth;
  }

  .chat-messages::-webkit-scrollbar {
    width: 10px;
  }

  .chat-messages::-webkit-scrollbar-track {
    background: transparent;
  }

  .chat-messages::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.15);
    border-radius: 5px;
    border: 2px solid transparent;
    background-clip: padding-box;
  }

  .chat-messages::-webkit-scrollbar-thumb:hover {
    background: rgba(255,255,255,0.3);
    border: 2px solid transparent;
    background-clip: padding-box;
  }

  .msg {
    display: flex;
    gap: 10px;
    animation: msgIn 0.3s ease;
  }

  @keyframes msgIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
  }

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

  .msg-avatar {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
    margin-top: 2px;
  }

  .msg.user .msg-avatar {
    background: rgba(59,130,246,0.15);
    border: 1px solid rgba(59,130,246,0.2);
  }

  .msg > div {
    max-width: 420px;
    flex-shrink: 0;
  }

  .msg-bubble {
    max-width: 100%;
    padding: 12px 16px;
    border-radius: 14px;
    font-size: 14px;
    line-height: 1.7;
    word-wrap: break-word;
    overflow-wrap: break-word;
  }

  .msg.ai .msg-bubble {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-top-left-radius: 4px;
  }

  .msg.user .msg-bubble {
    background: var(--accent-blue);
    color: white;
    border-top-right-radius: 4px;
  }

  .msg-time {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 4px;
    padding: 0 4px;
  }

  .msg.user .msg-time {
    text-align: right;
  }

  /* ── Typing indicator ── */
  .typing-indicator {
    display: flex;
    gap: 10px;
    align-items: flex-end;
  }

  .typing-dots {
    display: flex;
    gap: 4px;
    padding: 12px 16px;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    border-radius: 14px;
    border-top-left-radius: 4px;
  }

  .typing-dots span {
    width: 6px;
    height: 6px;
    background: var(--text-muted);
    border-radius: 50%;
    animation: typingBounce 1.2s infinite;
  }

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

  @keyframes typingBounce {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-6px); opacity: 1; }
  }

  /* ── Chat input ── */
  .chat-input-area {
    padding: 16px 20px;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 10px;
    align-items: flex-end;
    background: rgba(255,255,255,0.01);
  }

  .chat-input {
    flex: 1;
    min-width: 0;
    width: 100%;
    box-sizing: border-box;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px 16px;
    color: var(--text-primary);
    font-size: 15px;
    font-family: var(--font-sans);
    resize: none;
    outline: none;
    min-height: 48px;
    max-height: 120px;
    transition: border-color 0.2s;
    line-height: 1.6;
    overflow-wrap: break-word;
    word-break: break-all;
  }

  .chat-input:focus {
    border-color: rgba(255,255,255,0.2);
  }

  .chat-input::placeholder {
    color: var(--text-muted);
  }

  .send-btn {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--accent-gold);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: all 0.2s;
    flex-shrink: 0;
    color: #0a0e1a;
  }

  .send-btn:hover {
    background: #e0a820;
    transform: scale(1.05);
  }

  .send-btn:active {
    transform: scale(0.95);
  }

  /* ── Welcome message ── */
  .welcome-card {
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 20px;
    margin-bottom: 8px;
  }

  .welcome-card h5 {
    font-family: var(--font-serif);
    font-size: 15px;
    color: var(--text-primary);
    margin-bottom: 8px;
  }

  .welcome-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
  }

  /* ── Responsive ── */
  @media (max-width: 768px) {
    header { padding: 16px 20px; }
    .hero { padding: 48px 20px 40px; }
    .departments { padding: 0 20px 60px; }
    .stats-bar { gap: 24px; padding: 20px; }
    .dept-grid { grid-template-columns: 1fr; }
    .chat-modal { height: 90vh; max-max-height: none; border-radius: 16px 16px 0 0; align-self: flex-end; }
    .chat-overlay { padding: 0; align-items: flex-end; }
  }

  /* ── Entrance animations ── */
  /* ── Entrance animations ── */
  .fade-up {
    opacity: 0;
    transform: translateY(24px);
    animation: fadeUp 0.6s ease forwards;
  }

  @keyframes fadeUp {
    to { opacity: 1; transform: translateY(0); }
  }

  .dept-card:nth-child(1) { animation-delay: 0.1s; }
  .dept-card:nth-child(2) { animation-delay: 0.2s; }
  .dept-card:nth-child(3) { animation-delay: 0.3s; }
  .dept-card:nth-child(4) { animation-delay: 0.4s; }

/* 退出确认弹窗 */
.logout-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  justify-content: center;
  align-items: center;
  z-index: 10000;
}
.logout-overlay.show {
  display: flex;
}
.logout-card {
  background: #fff;
  border-radius: 16px;
  padding: 32px;
  text-align: center;
  max-width: 360px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}
.logout-card-icon {
  font-size: 48px;
  margin-bottom: 16px;
}
.logout-card h3 {
  margin: 0 0 8px;
  color: #333;
  font-size: 20px;
}
.logout-card p {
  margin: 0 0 24px;
  color: #666;
  font-size: 14px;
}
.logout-card-btns {
  display: flex;
  gap: 12px;
  justify-content: center;
}
.logout-cancel, .logout-confirm {
  padding: 10px 24px;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  border: none;
}
.logout-cancel {
  background: #f5f5f5;
  color: #666;
}
.logout-cancel:hover {
  background: #e0e0e0;
}
.logout-confirm {
  background: #f0a020;
  color: #fff;
}
.logout-confirm:hover {
  background: #e09010;
}