:root {
    --font-mono: 'JetBrains Mono', ui-monospace, monospace;
    --font-body: 'Inter', system-ui, sans-serif;
  }

  html[data-theme="dark"] {
    --bg: #0b0b0e;
    --surface: #131318;
    --surface-2: #17171d;
    --text: #e8e7ec;
    --text-muted: #9d9ba8;
    --border: #26262f;
    --accent: #a78bfa;
    --accent-soft: rgba(167, 139, 250, 0.14);
    --accent-contrast: #0b0b0e;
    --shadow: 0 20px 40px -20px rgba(0,0,0,0.6);
  }

  html[data-theme="light"] {
    --bg: #faf9fb;
    --surface: #ffffff;
    --surface-2: #f3f1f6;
    --text: #1c1b1f;
    --text-muted: #5c5a66;
    --border: #e6e3ea;
    --accent: #8b5cf6;
    --accent-soft: rgba(139, 92, 246, 0.10);
    --accent-contrast: #ffffff;
    --shadow: 0 20px 40px -20px rgba(30,20,60,0.15);
  }

  * { box-sizing: border-box; }

  html { scroll-behavior: smooth; }

  body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    transition: background 0.3s ease, color 0.3s ease;
  }

  ::selection { background: var(--accent-soft); color: var(--accent); }

  a { color: inherit; }

  :focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 4px;
  }

  .accent { color: var(--accent); }

  /* ---------- Topbar ---------- */
  .topbar {
    position: sticky;
    top: 0;
    z-index: 50;
    background: color-mix(in srgb, var(--bg) 85%, transparent);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
  }

  .topbar-inner {
    max-width: 1080px;
    margin: 0 auto;
    padding: 14px 24px;
    display: flex;
    align-items: center;
    gap: 24px;
  }

  .brand {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1rem;
    white-space: nowrap;
  }

  .tabs {
    display: flex;
    gap: 4px;
    overflow-x: auto;
    scrollbar-width: none;
    flex: 1;
  }
  .tabs::-webkit-scrollbar { display: none; }

  .tab {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-muted);
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    white-space: nowrap;
    transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
  }

  .tab:hover { color: var(--text); }

  .tab.active {
    color: var(--accent);
    background: var(--accent-soft);
    border-color: var(--accent);
  }

  .theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    cursor: pointer;
    flex-shrink: 0;
    transition: border-color 0.2s ease, transform 0.2s ease;
  }
  .theme-toggle:hover { border-color: var(--accent); transform: translateY(-1px); }
  .theme-toggle svg { width: 16px; height: 16px; }
  .theme-toggle .icon-moon { display: none; }
  html[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
  html[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

  /* ---------- Layout helpers ---------- */
  .section-inner {
    max-width: 1080px;
    margin: 0 auto;
    padding: 88px 24px;
  }

  .section.alt { background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

  .file-label {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--accent);
    letter-spacing: 0.04em;
    margin: 0 0 10px;
  }

  .section-title {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: clamp(1.4rem, 3vw, 1.9rem);
    margin: 0 0 28px;
    letter-spacing: -0.01em;
  }

  .prose {
    max-width: 640px;
    color: var(--text-muted);
    font-size: 1.02rem;
  }

  .reveal {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }
  .reveal.in-view { opacity: 1; transform: translateY(0); }

  /* ---------- Hero ---------- */
  .hero {
    min-height: calc(100svh - 65px);
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border);
  }

  .hero-inner {
    max-width: 1080px;
    margin: 0 auto;
    padding: 60px 24px;
    width: 100%;
  }

  .prompt-line {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
    margin: 0 0 20px;
  }
  .prompt-line .prompt-user { color: var(--accent); }
  .prompt-line .prompt-path { color: var(--text); }

  .cursor {
    display: inline-block;
    color: var(--accent);
    animation: blink 1s step-end infinite;
  }

  @keyframes blink { 50% { opacity: 0; } }

  .hero-name {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: clamp(2.3rem, 6vw, 4rem);
    line-height: 1.05;
    margin: 0 0 14px;
    letter-spacing: -0.02em;
  }

  .hero-title {
    font-family: var(--font-mono);
    font-size: clamp(0.95rem, 2vw, 1.1rem);
    color: var(--accent);
    margin: 0 0 22px;
  }

  .hero-about {
    max-width: 560px;
    color: var(--text-muted);
    font-size: 1.05rem;
    margin: 0 0 36px;
  }

  .hero-reveal {
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.7s ease 0.15s, transform 0.7s ease 0.15s;
  }
  .hero-reveal.shown { opacity: 1; transform: translateY(0); }

  .cta-row { display: flex; gap: 14px; flex-wrap: wrap; }

  .btn {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    padding: 12px 22px;
    border-radius: 8px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: 1px solid transparent;
    transition: transform 0.15s ease, border-color 0.2s ease, background 0.2s ease;
    cursor: pointer;
  }
  .btn:hover { transform: translateY(-2px); }

  .btn-solid {
    background: var(--accent);
    color: var(--accent-contrast);
    font-weight: 600;
  }

  .btn-outline {
    background: transparent;
    border-color: var(--border);
    color: var(--text);
  }
  .btn-outline:hover { border-color: var(--accent); color: var(--accent); }

  /* ---------- Tags ---------- */
  .tag-grid { display: flex; flex-wrap: wrap; gap: 10px; }

  .tag {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.02em;
    padding: 8px 14px;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: var(--surface-2);
    color: var(--text);
  }
  .tag.small { font-size: 0.7rem; padding: 5px 10px; color: var(--text-muted); }

  /* ---------- Projects ---------- */
  .project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
  }

  .project-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
  }
  .project-card:hover { border-color: var(--accent); transform: translateY(-3px); box-shadow: var(--shadow); }

  .section.alt .project-card { background: var(--bg); }

  .project-cmd {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
  }

  .project-name {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    margin: 10px 0 10px;
  }

  .project-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin: 0 0 16px;
  }

  .project-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }

  .project-link {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid transparent;
  }
  .project-link:hover { border-color: var(--accent); }

  .project-card.is-pending { opacity: 0.75; }
  .project-link.pending {
    color: var(--text-muted);
    font-style: italic;
    border-bottom: none;
  }

  /* ---------- Contact ---------- */
  .contact-list {
    list-style: none;
    padding: 0;
    margin: 28px 0 0;
    display: flex;
    flex-direction: column;
    gap: 14px;
  }

  .contact-list a {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    text-decoration: none;
    color: var(--text);
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: color 0.2s ease;
  }
  .contact-list a:hover { color: var(--accent); }
  .contact-list a::before {
    content: '→';
    color: var(--accent);
  }

  /* ---------- Footer ---------- */
  .footer {
    padding: 48px 24px 60px;
    text-align: center;
  }

  .footer-line {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text);
    margin: 0 0 8px;
  }
  .footer-line .blink { animation: blink 1s step-end infinite; color: var(--accent); }

  .footer-copy {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    margin: 0;
  }

  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .cursor, .blink { animation: none; opacity: 1; }
    .reveal, .hero-reveal { opacity: 1; transform: none; transition: none; }
    .btn:hover, .project-card:hover, .theme-toggle:hover { transform: none; }
  }

  @media (max-width: 640px) {
    .hero-inner, .section-inner { padding-left: 20px; padding-right: 20px; }
    .cta-row { flex-direction: column; align-items: flex-start; }
    .btn { width: 100%; justify-content: center; }
  }