/* ── Custom Properties ─────────────────────────────── */
:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f8f8f8;
  --color-text: #111111;
  --color-text-muted: #555555;
  --color-accent: #e63946;
  --color-dark: #111111;
  --color-border: #e8e8e8;

  /* Writing section palette (from book cover) */
  --color-gold: #c9a227;
  --color-gold-light: #d4af37;
  --color-midnight: #0d1b2a;
  --color-midnight-alt: #1b2838;

  --font: 'Inter', system-ui, sans-serif;
  --font-serif: 'Source Serif 4', Georgia, serif;
  --nav-height: 64px;
  --max-width: 1100px;
  --section-pad: 96px 24px;
}

/* Dark mode */
[data-theme="dark"] {
  --color-bg: #0d0d0d;
  --color-bg-alt: #161616;
  --color-text: #f0f0f0;
  --color-text-muted: #999999;
  --color-dark: #000000;
  --color-border: #2a2a2a;
}

/* ── Reset ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; background: none; border: none; font: inherit; }

/* ── Navigation ────────────────────────────────────── */
#nav {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: rgba(255,255,255,0.97);
  border-bottom: 1px solid var(--color-border);
  z-index: 100; backdrop-filter: blur(4px);
}
[data-theme="dark"] #nav { background: rgba(13,13,13,0.97); }
.nav-inner {
  max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
  height: 100%; display: flex; align-items: center; justify-content: space-between;
}
.nav-name { font-weight: 700; font-size: 15px; letter-spacing: 0.5px; }
.nav-links { display: flex; gap: 32px; }
.nav-links a {
  font-size: 13px; font-weight: 500; letter-spacing: 1px;
  text-transform: uppercase; color: var(--color-text-muted); transition: color 0.2s;
}
.nav-links a:hover { color: var(--color-accent); }
.nav-link-writing { color: var(--color-gold) !important; }
.nav-link-writing:hover { color: var(--color-gold-light) !important; }
.nav-link-engineering { color: var(--color-accent) !important; }
.nav-hamburger { display: none; flex-direction: column; gap: 5px; padding: 4px; }
.nav-hamburger span { display: block; width: 22px; height: 2px; background: var(--color-text); transition: transform 0.2s, opacity 0.2s; }

/* Theme toggle */
.theme-toggle {
  display: flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; color: var(--color-text-muted);
  border-radius: 50%; transition: color 0.2s, background 0.2s; margin-left: 16px;
}
.theme-toggle:hover { color: var(--color-accent); background: var(--color-bg-alt); }
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

@media (max-width: 768px) {
  .nav-hamburger { display: flex; }
  .nav-links {
    display: none; position: fixed; inset: var(--nav-height) 0 0 0;
    background: var(--color-bg); flex-direction: column;
    align-items: center; justify-content: center; gap: 40px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { font-size: 18px; color: var(--color-text); }
  .theme-toggle { margin-left: 8px; }
}

/* ── Buttons ───────────────────────────────────────── */
.btn {
  display: inline-block; padding: 14px 28px; font-size: 12px;
  font-weight: 700; letter-spacing: 2px; text-transform: uppercase;
  transition: opacity 0.2s, background 0.2s, color 0.2s;
}
.btn-primary { background: var(--color-accent); color: #fff; }
.btn-primary:hover { opacity: 0.85; }
.btn-outline { border: 2px solid var(--color-text); color: var(--color-text); }
.btn-outline:hover { background: var(--color-text); color: #fff; }
.btn-gold { background: var(--color-gold); color: #fff; }
.btn-gold:hover { background: var(--color-gold-light); }
.btn-outline-gold { border: 2px solid var(--color-gold); color: var(--color-gold); }
.btn-outline-gold:hover { background: var(--color-gold); color: #fff; }
.btn-accent { border: 2px solid var(--color-accent); color: var(--color-accent); }
.btn-accent:hover { background: var(--color-accent); color: #fff; }
.btn-ghost { border: 2px solid #444; color: #999; }
.btn-ghost:hover { border-color: #999; color: #fff; }

/* ── Labels & Section Headings ─────────────────────── */
.label { font-size: 11px; font-weight: 700; letter-spacing: 3px; text-transform: uppercase; color: var(--color-accent); margin-bottom: 20px; }
.label--gold { color: var(--color-gold); }
.label--light { color: var(--color-accent); }
.section-heading { font-size: clamp(28px, 4vw, 40px); font-weight: 900; letter-spacing: -1px; margin-bottom: 48px; margin-top: 8px; }
.section-heading--light { color: #ffffff; }
.section-inner { max-width: var(--max-width); margin: 0 auto; padding: var(--section-pad); }
section { width: 100%; }

/* ── Landing Page ──────────────────────────────────── */
#landing-hero {
  min-height: 70vh; display: flex; align-items: center; justify-content: center;
  padding: calc(var(--nav-height) + 48px) 24px 48px;
}
.landing-inner { max-width: 720px; text-align: center; margin: 0 auto; }
.landing-heading { font-size: clamp(40px, 7vw, 72px); font-weight: 900; line-height: 1.0; letter-spacing: -2px; margin-bottom: 24px; }
.landing-sub { font-size: 17px; color: var(--color-text-muted); line-height: 1.7; margin-bottom: 0; }

#fork { padding: 0 24px 96px; }
.fork-grid { max-width: var(--max-width); margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.fork-card {
  display: block; border: 1px solid var(--color-border); border-radius: 8px;
  padding: 48px 40px; transition: transform 0.2s, box-shadow 0.2s;
  position: relative; overflow: hidden;
}
.fork-card:hover { transform: translateY(-4px); box-shadow: 0 8px 32px rgba(0,0,0,0.1); }
.fork-card--engineering { border-top: 4px solid var(--color-accent); background: var(--color-bg); }
.fork-card--writing { border-top: 4px solid var(--color-gold); background: var(--color-midnight); color: #f0f0f0; }
[data-theme="dark"] .fork-card--engineering { background: var(--color-bg-alt); }
.fork-label { font-size: 11px; font-weight: 700; letter-spacing: 3px; text-transform: uppercase; color: var(--color-accent); margin-bottom: 16px; }
.fork-label--gold { color: var(--color-gold); }
.fork-title { font-size: clamp(28px, 4vw, 40px); font-weight: 900; line-height: 1.1; margin-bottom: 20px; }
.fork-desc { font-size: 15px; line-height: 1.7; margin-bottom: 24px; opacity: 0.85; }
.fork-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 32px; }
.fork-tags span { background: var(--color-bg-alt); border: 1px solid var(--color-border); padding: 3px 10px; font-size: 11px; color: var(--color-text-muted); border-radius: 2px; }
.fork-tags--gold span { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.15); color: rgba(255,255,255,0.7); }
.fork-cta { font-size: 14px; font-weight: 700; color: var(--color-accent); }
.fork-cta--gold { color: var(--color-gold); }

@media (max-width: 768px) { .fork-grid { grid-template-columns: 1fr; } }

/* ── Shared Footer ─────────────────────────────────── */
.site-footer-shared {
  padding: 48px 24px; border-top: 1px solid var(--color-border);
  text-align: center;
}
.footer-links { display: flex; gap: 24px; justify-content: center; margin-bottom: 16px; flex-wrap: wrap; }
.footer-links a { font-size: 13px; font-weight: 500; color: var(--color-text-muted); transition: color 0.2s; }
.footer-links a:hover { color: var(--color-accent); }
.footer-copy { font-size: 12px; color: var(--color-text-muted); }

/* ── Work Page: Hero ───────────────────────────────── */
#hero { min-height: 100vh; display: flex; align-items: center; padding: var(--section-pad); padding-top: calc(var(--nav-height) + 48px); }
.hero-inner { max-width: var(--max-width); margin: 0 auto; width: 100%; }
.hero-divider { width: 48px; height: 4px; background: var(--color-accent); margin-bottom: 24px; }
.hero-divider--gold { background: var(--color-gold); }
.hero-heading { font-size: clamp(48px, 8vw, 88px); font-weight: 900; line-height: 1.0; letter-spacing: -2px; margin-bottom: 24px; }
.hero-sub { font-size: 17px; color: var(--color-text-muted); max-width: 520px; line-height: 1.7; margin-bottom: 40px; }
.hero-ctas { display: flex; gap: 16px; flex-wrap: wrap; }

/* ── Work Page: About ──────────────────────────────── */
#about { background: var(--color-bg-alt); }
.about-grid { display: grid; grid-template-columns: 220px 1fr; gap: 64px; align-items: start; }
.about-photo { position: relative; aspect-ratio: 1; background: var(--color-border); border-radius: 4px; overflow: hidden; }
.about-photo img { width: 100%; height: 100%; object-fit: cover; }
.photo-placeholder { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; color: #aaa; font-size: 13px; }
.about-photo.has-photo .photo-placeholder { display: none; }
.about-photo:not(.has-photo) #profile-photo { display: none; }
.about-bio { font-size: 16px; color: var(--color-text-muted); line-height: 1.8; margin-bottom: 40px; }
.about-stats { display: flex; gap: 40px; }
.stat { display: flex; flex-direction: column; gap: 4px; }
.stat-value { font-size: 28px; font-weight: 900; color: var(--color-text); line-height: 1; }
.stat-label { font-size: 10px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; color: var(--color-text-muted); }
.github-stats { margin-top: 32px; }
.github-stats img { max-width: 100%; height: auto; }

@media (max-width: 768px) {
  .about-grid { grid-template-columns: 1fr; gap: 32px; }
  .about-photo { width: 120px; height: 120px; }
  .about-stats { flex-wrap: wrap; gap: 24px; }
}

/* ── Work Page: Projects ───────────────────────────── */
.projects-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.project-card { border: 1px solid var(--color-border); border-top: 3px solid var(--color-text); padding: 28px; transition: box-shadow 0.2s; }
.project-card--featured { border-top-color: var(--color-accent); }
.project-card:hover { box-shadow: 0 4px 24px rgba(0,0,0,0.07); }
.project-screenshot { margin: -28px -28px 20px; overflow: hidden; border-bottom: 1px solid var(--color-border); aspect-ratio: 16/10; }
.project-screenshot img { width: 100%; height: 100%; object-fit: cover; object-position: top center; transition: transform 0.3s ease; }
.project-card:hover .project-screenshot img { transform: scale(1.02); }
.project-category { font-size: 10px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; color: var(--color-accent); margin-bottom: 10px; }
.project-title { font-size: 18px; font-weight: 700; margin-bottom: 12px; line-height: 1.3; }
.project-desc { font-size: 14px; color: var(--color-text-muted); line-height: 1.7; margin-bottom: 20px; }
.project-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.project-tags li { background: var(--color-bg-alt); border: 1px solid var(--color-border); padding: 3px 10px; font-size: 11px; color: var(--color-text-muted); border-radius: 2px; }
.project-links { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 20px; }
.project-links .btn { padding: 10px 20px; font-size: 11px; }
.projects-subsection-title { font-size: 13px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; color: var(--color-text-muted); margin-top: 56px; margin-bottom: 24px; padding-bottom: 10px; border-bottom: 1px solid var(--color-border); }
.projects-subsection-title:first-of-type { margin-top: 0; }

@media (max-width: 768px) { .projects-grid { grid-template-columns: 1fr; } }

/* ── Work Page: Skills ─────────────────────────────── */
#skills { background: var(--color-bg-alt); }
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 40px; }
.skill-group-title { font-size: 12px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; color: var(--color-text); margin-bottom: 20px; padding-bottom: 12px; border-bottom: 2px solid var(--color-accent); }
.skill-list { display: flex; flex-direction: column; gap: 10px; }
.skill-list li { font-size: 14px; color: var(--color-text-muted); padding-left: 12px; position: relative; }
.skill-list li::before { content: ''; position: absolute; left: 0; top: 8px; width: 4px; height: 4px; background: var(--color-accent); border-radius: 50%; }

/* ── Work Page: Contact ────────────────────────────── */
#contact { background: var(--color-dark); }
.contact-inner { text-align: center; }
.contact-sub { font-size: 16px; color: #999; max-width: 480px; margin: 0 auto 40px; line-height: 1.7; }
.contact-links { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.site-footer { text-align: center; font-size: 12px; color: #555; padding: 20px 24px 40px; border-top: 1px solid #222; }

/* ── Writing Page: Book Hero ───────────────────────── */
#book-hero { padding: calc(var(--nav-height) + 48px) 24px 96px; background: var(--color-midnight); color: #f0f0f0; }
.book-hero-inner { max-width: var(--max-width); margin: 0 auto; display: grid; grid-template-columns: 320px 1fr; gap: 64px; align-items: start; }
.book-cover { position: relative; }
.book-cover img { width: 100%; border-radius: 4px; box-shadow: 0 8px 32px rgba(0,0,0,0.4); }
.book-title { font-family: var(--font-serif); font-size: clamp(40px, 6vw, 56px); font-weight: 600; line-height: 1.0; margin-bottom: 16px; letter-spacing: -1px; }
.book-epigraph { font-family: var(--font-serif); font-style: italic; font-size: 14px; color: rgba(255,255,255,0.6); margin-bottom: 24px; }
.epigraph-source { font-size: 12px; opacity: 0.7; }
.book-synopsis { font-family: var(--font-serif); font-size: 17px; line-height: 1.8; color: rgba(255,255,255,0.85); margin-bottom: 20px; }
.book-synopsis--final { color: rgba(255,255,255,0.7); font-style: italic; }
.book-ctas { margin-top: 32px; }

@media (max-width: 768px) {
  .book-hero-inner { grid-template-columns: 1fr; gap: 32px; }
  .book-cover { max-width: 240px; margin: 0 auto; }
}

/* ── Writing Page: Author Bio ──────────────────────── */
#author { background: var(--color-bg); }
.author-bio { max-width: 680px; }
.author-bio p { font-family: var(--font-serif); font-size: 17px; line-height: 1.8; color: var(--color-text-muted); margin-bottom: 20px; }

/* ── Writing Page: Agent Contact ───────────────────── */
#agent-contact { background: var(--color-midnight); color: #f0f0f0; }
#agent-contact .contact-sub { color: rgba(255,255,255,0.7); }

/* ── Excerpt Page: Reading Typography ──────────────── */
.excerpt-article { max-width: 680px; margin: 0 auto; padding: calc(var(--nav-height) + 64px) 24px 96px; }
.excerpt-header { text-align: center; margin-bottom: 48px; }
.excerpt-chapter-title { font-family: var(--font-serif); font-size: 32px; font-weight: 600; margin-bottom: 16px; }
.excerpt-back { font-size: 13px; color: var(--color-text-muted); transition: color 0.2s; }
.excerpt-back:hover { color: var(--color-gold); }
.excerpt-body { font-family: var(--font-serif); font-size: 18px; line-height: 1.8; color: var(--color-text); }
.excerpt-body p { margin-bottom: 1.5em; text-indent: 2em; }
.excerpt-body p:first-of-type { text-indent: 0; }
.excerpt-footer { text-align: center; margin-top: 64px; padding-top: 32px; border-top: 1px solid var(--color-border); }
.excerpt-note { font-size: 14px; color: var(--color-text-muted); margin-bottom: 24px; font-style: italic; }
.excerpt-footer .btn { margin: 0 8px 12px; }

[data-theme="dark"] .excerpt-body { color: var(--color-text); }

/* ── Scroll Reveal ─────────────────────────────────── */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.5s ease, transform 0.5s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }
.nav-links a.active { color: var(--color-accent); }