:root {
    --ink: #1B2A41;
    --ink-soft: #5B6B7C;
    --cream: #FAF9F5;
    --panel: #FFFFFF;
    --line: #E4E1D8;
    --gold: #B8922F;
    --gold-soft: #F1E6C8;
  }

  * { box-sizing: border-box; }

  html, body {
    margin: 0;
    height: 100%;
    background: var(--cream);
    color: var(--ink);
    font-family: 'Inter', system-ui, sans-serif;
  }

  h3 a {
    color: white;
    text-decoration: underline;
  }

  .app {
    display: flex;
    min-height: 100vh;
  }

  /* ---------- Sidebar ---------- */
  .sidebar {
    width: 280px;
    flex-shrink: 0;
    background: var(--ink);
    color: #E8ECF1;
    padding: 32px 20px;
    display: flex;
    flex-direction: column;
  }

  .sidebar h1 {
    font-family: 'Fraunces', serif;
    font-weight: 500;
    font-size: 1.4rem;
    line-height: 1.25;
    margin: 0 0 4px;
    color: #fff;
  }

  .sidebar .sub {
    font-size: 0.8rem;
    color: #9AA9BC;
    margin: 0 0 28px;
  }

  .mentor-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
    overflow-y: auto;
  }

  .mentor-item button {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 12px;
    background: none;
    border: none;
    color: #C7D0DC;
    font-family: inherit;
    font-size: 0.95rem;
    text-align: left;
    padding: 10px 10px;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
  }

  .mentor-item button:hover {
    background: rgba(255,255,255,0.06);
    color: #fff;
  }

  .mentor-item.active button {
    background: rgba(184, 146, 47, 0.18);
    color: #fff;
  }

  .avatar {
    flex-shrink: 0;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: rgba(255,255,255,0.08);
    border: 1.5px solid rgba(184, 146, 47, 0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Fraunces', serif;
    font-size: 0.85rem;
    color: var(--gold-soft);
  }

  .mentor-item.active .avatar {
    background: var(--gold);
    border-color: var(--gold);
    color: var(--ink);
  }

  .mentor-name {
    font-weight: 500;
  }

  .sidebar-footer {
    margin-top: auto;
    padding-top: 20px;
    font-size: 0.72rem;
    color: #6C7B8E;
    border-top: 1px solid rgba(255,255,255,0.08);
  }

  /* ---------- Main panel ---------- */
  .main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
  }

  .main-header {
    padding: 28px 40px 20px;
    border-bottom: 1px solid var(--line);
    background: var(--panel);
  }

  .eyebrow {
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--gold);
    font-weight: 600;
    margin: 0 0 6px;
  }

  .main-header h2 {
    font-family: 'Fraunces', serif;
    font-weight: 500;
    font-size: 1.7rem;
    margin: 0 0 4px;
  }

  .main-header p {
    margin: 0;
    color: var(--ink-soft);
    font-size: 0.92rem;
  }

  .embed-wrap {
    flex: 1;
    padding: 24px 40px 40px;
  }

  .calendly-inline-widget {
    min-width: 320px;
    height: 100%;
    min-height: 700px;
    border: 1px solid var(--line);
    border-radius: 12px;
    overflow: hidden;
    background: var(--panel);
  }

  .empty-state {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    min-height: 400px;
    color: var(--ink-soft);
    font-size: 0.95rem;
    text-align: center;
  }

  /* ---------- Mobile ---------- */
  @media (max-width: 720px) {
    .app { flex-direction: column; }
    .sidebar {
      width: 100%;
      padding: 20px;
    }
    .mentor-list {
      flex-direction: row;
      flex-wrap: wrap;
      overflow-y: visible;
    }
    .mentor-item button { padding: 8px 10px; }
    .main-header, .embed-wrap { padding-left: 20px; padding-right: 20px; }
  }