:root {
    --primary: #9b87f5;
    --secondary: #7dd3fc;
    --tertiary: #fda4af;
    --dark: #2d3748;
    --light: #f5f5f5;
    --text: #333333;
    --white: #ffffff;
  }
  
  /* ── Reset & Base ── */
  *, *::before, *::after { box-sizing: border-box; }
  
  body {
    margin: 0;
    font-family: 'Arial', 'Helvetica', sans-serif;
    background: radial-gradient(circle at 20% 50%, rgba(155,135,245,0.15), transparent),
                radial-gradient(circle at 80% 50%, rgba(125,211,252,0.15), transparent),
                var(--light);
    background-attachment: fixed;
    color: var(--text);
    line-height: 1.6;
  }
  
  a { color: var(--primary); text-decoration: none; }
  a:visited { color: var(--tertiary); }
  
  ::selection {
    background: rgba(125,211,252,0.4);
    color: var(--dark);
  }
  
  /* ── Site Header ── */
  .site-header {
    background: var(--dark);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  }
  
  /* Nav as grid: logo left, links right */
  .nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 18px 20px;
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: center;
  }
  
  .logo {
    font-weight: 700;
    font-size: 24px;
    color: var(--primary);
  }
  .logo:hover { color: var(--secondary); }
  .logo:visited { color: var(--primary); }
  
  .nav-links {
    justify-self: end;
    display: flex;
    gap: 8px;
  }
  
  .nav-links a {
    color: var(--white);
    font-size: 16px;
    padding: 8px 14px;
    border-radius: 5px;
    transition: background 0.2s, color 0.2s;
  }
  .nav-links a:visited { color: var(--white); }
  .nav-links a:hover { color: var(--secondary); text-decoration: underline; }
  .nav-links a:active { opacity: 0.7; }
  .nav-links a:focus { outline: 2px solid var(--secondary); outline-offset: 4px; }
  
  /* Active nav tab */
  .nav-links a.active {
    background: var(--primary);
    color: var(--white);
    font-weight: 700;
    border-radius: 5px;
  }
  .nav-links a.active:visited { color: var(--white); }
  
  /* ── Banner (Home) ── */
  .banner {
    min-height: 450px;
    background-image: url("https://images.unsplash.com/photo-1517694712202-14dd9538aa97?w=1200");
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    position: relative;
  }
  
  .banner::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg,
                rgba(155,135,245,0.75),
                rgba(125,211,252,0.75));
  }
  
  .banner-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 120px 20px;
    position: relative;
    text-align: center;
  }
  
  .banner h1 {
    font-size: 48px;
    margin: 0 0 16px;
    color: var(--white);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
  }
  
  .banner p {
    color: var(--white);
    font-size: 20px;
    max-width: 600px;
    margin: 0 auto 28px;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
  }
  
  /* ── Buttons ── */
  .btn {
    display: inline-block;
    background: var(--white);
    color: var(--primary);
    padding: 12px 28px;
    border-radius: 6px;
    font-weight: 700;
    font-size: 16px;
    transition: background 0.2s, transform 0.2s;
  }
  .btn:hover {
    background: var(--secondary);
    color: var(--dark);
    transform: translateY(-2px);
  }
  .btn:visited { color: var(--primary); }
  
  .btn-secondary {
    display: inline-block;
    background: var(--primary);
    color: var(--white);
    padding: 10px 24px;
    border-radius: 6px;
    font-weight: 600;
    margin-top: 16px;
    transition: background 0.2s, transform 0.2s;
  }
  .btn-secondary:hover {
    background: var(--secondary);
    transform: translateY(-2px);
  }
  .btn-secondary:visited { color: var(--white); }
  
  /* ── Page wrapper – master grid ── */
  .page {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px 60px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  /* ── Section cards ── */
  .section {
    background: var(--white);
    border: 1px solid rgba(0,0,0,0.08);
    border-radius: 12px;
    padding: 40px 30px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  }
  
  /* Remove top margin since gap handles spacing */
  .section { margin-top: 0; }
  
  .section h2 {
    color: var(--primary);
    font-size: 32px;
    margin: 0 0 20px;
  }
  
  .section p {
    color: var(--text);
    font-size: 16px;
    line-height: 1.8;
    max-width: 800px;
  }
  
  /* ── Featured-work / Portfolio cards – grid columns ── */
  .cols {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 30px;
  }
  
  .col a.card {
    display: block;
    background: var(--light);
    padding: 16px;
    border-radius: 12px;
    border: 2px solid transparent;
    transition: border-color 0.2s, transform 0.2s;
  }
  .col a.card:hover {
    border-color: var(--secondary);
    transform: translateY(-4px);
  }
  
  .col a.card img {
    width: 100%;
    aspect-ratio: 4/3;
    object-fit: cover;
    display: block;
    border-radius: 8px;
    border: 1px solid rgba(0,0,0,0.1);
  }
  .col a.card:hover img {
    filter: brightness(1.05) contrast(1.05);
  }
  
  a.card > h3 {
    margin: 14px 0 8px;
    color: var(--dark);
    font-size: 20px;
  }
  a.card > p {
    margin: 0;
    color: var(--text);
    font-size: 14px;
    line-height: 1.6;
  }
  
  a[target="_blank"] {
    box-shadow: 0 0 0 3px rgba(253,164,175,0.3);
  }
  
  /* ── Page header (gradient banners on sub-pages) ── */
  .page-header {
    text-align: center;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
  }
  .page-header h1 {
    color: var(--white);
    font-size: 42px;
    margin: 0 0 12px;
  }
  .page-header .subtitle {
    font-size: 18px;
    color: var(--white);
    opacity: 0.95;
    margin: 0;
  }
  
  /* ── Contact CTA / Contact section (gradient) ── */
  .contact-section,
  .contact-cta {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
    text-align: center;
  }
  .contact-section h2,
  .contact-cta h2 { color: var(--white); }
  .contact-section .contact-text,
  .contact-cta p {
    color: var(--white);
    max-width: 700px;
    margin: 0 auto 20px;
  }
  
  /* ── About page ── */
  .about-content { max-width: 800px; margin: 0 auto; }
  .about-text p { margin-bottom: 20px; font-size: 16px; line-height: 1.8; }
  
  /* Skills – grid columns */
  .skills-section { background: var(--light); }
  
  .skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-top: 30px;
  }
  
  .skill-col {
    background: var(--white);
    padding: 24px;
    border-radius: 8px;
    border: 1px solid rgba(0,0,0,0.08);
  }
  
  .skill-col h3 {
    color: var(--primary);
    margin: 0 0 16px;
    font-size: 22px;
  }
  
  .skill-list { list-style: none; padding: 0; margin: 0; }
  .skill-list li {
    padding: 8px 0;
    color: var(--text);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: color 0.2s, padding-left 0.2s;
  }
  .skill-list li:last-child { border-bottom: none; }
  .skill-list li:hover { color: var(--primary); padding-left: 8px; }
  
  /* Timeline */
  .education-section { background: var(--white); }
  
  .timeline { max-width: 800px; margin: 30px auto 0; }
  
  .timeline-item {
    padding: 24px;
    margin-bottom: 24px;
    background: var(--light);
    border-left: 4px solid var(--primary);
    border-radius: 8px;
    transition: border-left-color 0.2s, transform 0.2s;
  }
  .timeline-item:hover {
    border-left-color: var(--secondary);
    transform: translateX(4px);
  }
  .timeline-item h3 { color: var(--dark); margin: 0 0 8px; font-size: 20px; }
  .timeline-meta { color: var(--primary); font-size: 14px; font-weight: 600; margin: 0 0 12px; }
  .timeline-item p { margin: 0; color: var(--text); line-height: 1.7; }
  
  /* ── Contact page ── */
  .contact-info-section { background: var(--light); }
  
  .contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
    margin-top: 30px;
  }
  
  .contact-item {
    padding: 24px;
    background: var(--white);
    border-radius: 8px;
    border: 1px solid rgba(0,0,0,0.08);
  }
  .contact-item h3 { color: var(--primary); margin: 0 0 12px; font-size: 18px; }
  .contact-item p { margin: 0; color: var(--text); }
  .contact-item a { color: var(--primary); }
  .contact-item a:hover { color: var(--secondary); text-decoration: underline; }
  
  /* Form */
  .contact-form-container { max-width: 700px; margin: 30px auto 0; }
  .form-field { margin-bottom: 20px; }
  .form-field label {
    display: block;
    color: var(--dark);
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 14px;
  }
  .form-field input,
  .form-field textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid rgba(0,0,0,0.1);
    border-radius: 6px;
    font-family: inherit;
    font-size: 15px;
    color: var(--text);
    transition: border-color 0.2s;
  }
  .form-field input:focus,
  .form-field textarea:focus {
    outline: none;
    border-color: var(--primary);
  }
  .form-field textarea { resize: vertical; min-height: 120px; }
  .form-field button { border: none; cursor: pointer; font-family: inherit; transition: transform 0.2s; }
  .form-field button:hover { transform: translateY(-2px); }
  
  /* ── Portfolio detail grid ── */
  .portfolio-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-top: 30px;
    align-items: start;
  }
  
  .portfolio-detail-grid img,
  .portfolio-detail-grid video {
    width: 100%;
    border-radius: 8px;
    border: 1px solid rgba(0,0,0,0.1);
  }
  
  .portfolio-detail-text h3 {
    color: var(--dark);
    margin: 0 0 12px;
    font-size: 22px;
  }
  
  .portfolio-detail-text p {
    margin: 0 0 12px;
    line-height: 1.8;
  }
  
  /* Tags */
  .tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
  .tag {
    display: inline-block;
    background: rgba(155,135,245,0.12);
    color: var(--primary);
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
  }
  
  /* ── Footer ── */
  .site-footer {
    background: var(--dark);
    color: var(--white);
    text-align: center;
    padding: 30px 20px;
    margin-top: 40px;
  }
  .site-footer p { margin: 0 0 16px; font-size: 14px; }
  
  .social-links { display: flex; justify-content: center; gap: 24px; }
  .social-links a { color: var(--secondary); font-size: 14px; }
  .social-links a:hover { color: var(--tertiary); text-decoration: underline; }
  
  /* ── Responsive ── */
  @media (max-width: 768px) {
    .banner h1 { font-size: 32px; }
    .banner p { font-size: 16px; }
    .page-header h1 { font-size: 28px; }
  
    .nav {
      grid-template-columns: 1fr;
      text-align: center;
    }
    .nav-links {
      justify-self: center;
      margin-top: 12px;
      flex-wrap: wrap;
      justify-content: center;
    }
  
    .portfolio-detail-grid {
      grid-template-columns: 1fr;
    }
  }