* {
    box-sizing: border-box;
  }
  
  html {
    scroll-behavior: smooth;
  }
  
  body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: #f8fafc;
    color: #0f172a;
  }
  
  /* Full page layout */
  .shell {
    display: grid;
    grid-template-columns: 240px 1fr;
    min-height: 100vh;
  }
  
  /* Sidebar */
  .sidebar {
    background: #ffffff;
    border-right: 1px solid #dbeafe;
    padding: 24px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: sticky;
    top: 0;
    height: 100vh;
  }
  
  .name-btn {
    width: 100%;
    background: #ecfeff;
    color: #0f172a;
    border: 1px solid #67e8f9;
    border-radius: 14px;
    padding: 14px;
    font-weight: 800;
    font-size: 1rem;
    text-align: left;
    cursor: pointer;
  }
  
  .name-btn span {
    float: right;
    color: #0891b2;
  }
  
  .bio {
    margin-top: 14px;
    padding: 12px;
    background: #f0fdfa;
    border-radius: 14px;
    border: 1px solid #ccfbf1;
  }
  
  .bio p {
    margin: 6px 0;
    font-size: 0.85rem;
    color: #334155;
  }
  
  .hidden {
    display: none;
  }
  
  .tabs {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 30px;
  }
  
  .tabs a {
    text-decoration: none;
    color: #334155;
    font-weight: 700;
    padding: 11px 12px;
    border-radius: 12px;
  }
  
  .tabs a:hover {
    background: #ecfeff;
    color: #0891b2;
  }
  
  .sidebar-footer {
    font-size: 0.85rem;
    color: #64748b;
  }
  
  /* Main content */
  .main {
    height: 100vh;
    overflow-y: auto;
    scroll-snap-type: y mandatory;
  }
  
  .hero,
  .section {
    min-height: 100vh;
    padding: 54px 64px;
    scroll-snap-align: start;
  }
  
  /* Hero */
  .hero {
    display: grid;
    grid-template-columns: 1.4fr 0.7fr;
    gap: 40px;
    align-items: center;
  }
  
  .eyebrow {
    color: #0891b2;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: 0.78rem;
    font-weight: 900;
  }
  
  h1 {
    font-size: clamp(3rem, 7vw, 6.5rem);
    line-height: 0.95;
    margin: 16px 0;
    max-width: 900px;
  }
  
  h2 {
    font-size: clamp(2rem, 4vw, 4rem);
    line-height: 1.05;
    margin: 10px 0 24px;
    max-width: 850px;
  }
  
  h3 {
    margin: 0 0 10px;
  }
  
  .statement {
    max-width: 820px;
    font-size: 1.15rem;
    line-height: 1.7;
    color: #334155;
  }
  
  .statement.small {
    font-size: 1rem;
    color: #475569;
  }
  
  .buttons {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 26px;
  }
  
  .buttons a,
  .contact-box a {
    background: #0891b2;
    color: white;
    text-decoration: none;
    font-weight: 800;
    padding: 12px 18px;
    border-radius: 999px;
  }
  
  .buttons a:hover,
  .contact-box a:hover {
    background: #0e7490;
  }
  
  .hero-card {
    background: #ffffff;
    border: 1px solid #bae6fd;
    border-radius: 24px;
    padding: 28px;
    box-shadow: 0 20px 50px rgba(15, 23, 42, 0.08);
  }
  
  .hero-card h3 {
    color: #0891b2;
    font-size: 1.3rem;
  }
  
  .hero-card p {
    border-bottom: 1px solid #e0f2fe;
    padding: 12px 0;
    margin: 0;
    color: #334155;
    font-weight: 700;
  }
  
  /* Sections */
  .section {
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
  
  .section-header {
    margin-bottom: 28px;
  }
  
  /* Timeline */
  .timeline {
    display: grid;
    gap: 18px;
    max-width: 1050px;
  }
  
  .timeline-item {
    display: grid;
    grid-template-columns: 90px 1fr;
    gap: 20px;
    background: #ffffff;
    border: 1px solid #dbeafe;
    border-radius: 22px;
    padding: 22px;
    box-shadow: 0 14px 35px rgba(15, 23, 42, 0.05);
  }
  
  .year {
    color: #0891b2;
    font-weight: 900;
    font-size: 1.2rem;
  }
  
  .timeline-item p {
    margin: 0;
    color: #475569;
    line-height: 1.6;
  }
  
  /* Focus */
  .compact {
    background: #ecfeff;
  }
  
  .focus-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    max-width: 1050px;
  }
  
  .focus-grid div {
    background: #ffffff;
    border: 1px solid #99f6e4;
    color: #0f172a;
    padding: 22px;
    border-radius: 18px;
    font-weight: 900;
    text-align: center;
  }
  
  /* Projects */
  .project-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
    max-width: 1150px;
  }
  
  .project-card {
    background: #ffffff;
    border: 1px solid #dbeafe;
    border-radius: 22px;
    padding: 24px;
    box-shadow: 0 14px 35px rgba(15, 23, 42, 0.05);
  }
  
  .project-card p {
    color: #475569;
    line-height: 1.6;
  }
  
  .project-card span {
    display: block;
    margin-top: 18px;
    color: #0891b2;
    font-weight: 900;
    font-size: 0.9rem;
  }
  
  /* Contact */
  .contact {
    background: #f0fdfa;
  }
  
  .contact-box {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 20px;
  }
  
  /* Responsive */
  @media (max-width: 900px) {
    .shell {
      grid-template-columns: 1fr;
    }
  
    .sidebar {
      position: relative;
      height: auto;
    }
  
    .main {
      height: auto;
      overflow-y: visible;
      scroll-snap-type: none;
    }
  
    .hero,
    .section {
      min-height: auto;
      padding: 42px 24px;
    }
  
    .hero {
      grid-template-columns: 1fr;
    }
  
    .focus-grid,
    .project-grid {
      grid-template-columns: 1fr;
    }
  
    .timeline-item {
      grid-template-columns: 1fr;
    }
  }