/* ============ Design tokens ============ */
:root {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-fg: #09090b;
  --color-primary: #18181b;
  --color-secondary: #52525b;
  --color-accent: #2563eb;
  --color-accent-fg: #ffffff;
  --color-muted: #eef0f3;
  --color-border: #e4e4e7;

  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'Source Serif 4', Georgia, serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 64px;
  --space-7: 96px;

  --radius: 10px;
  --duration: 220ms;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);

  color-scheme: light;
}

:root[data-theme="dark"] {
  --color-bg: #0a0a0b;
  --color-surface: #131316;
  --color-fg: #f4f4f5;
  --color-primary: #f4f4f5;
  --color-secondary: #a1a1aa;
  --color-accent: #5b9dff;
  --color-accent-fg: #08131f;
  --color-muted: #1c1c20;
  --color-border: #29292e;
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #0a0a0b;
    --color-surface: #131316;
    --color-fg: #f4f4f5;
    --color-primary: #f4f4f5;
    --color-secondary: #a1a1aa;
    --color-accent: #5b9dff;
    --color-accent-fg: #08131f;
    --color-muted: #1c1c20;
    --color-border: #29292e;
    color-scheme: dark;
  }
}

/* ============ Base ============ */
* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-fg);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  transition: background var(--duration) var(--ease), color var(--duration) var(--ease);
}

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

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-primary);
  margin: 0 0 var(--space-2);
}

h1 { font-size: clamp(2.1rem, 4vw + 1rem, 3.4rem); }
h2 { font-size: clamp(1.4rem, 1.6vw + 1rem, 1.9rem); margin-top: var(--space-6); }
h3 { font-size: 1.15rem; }

p { margin: 0 0 var(--space-3); max-width: 68ch; }

a {
  color: var(--color-accent);
  text-decoration-color: color-mix(in srgb, var(--color-accent) 40%, transparent);
  text-underline-offset: 3px;
  transition: color var(--duration) var(--ease), text-decoration-color var(--duration) var(--ease);
}
a:hover { text-decoration-color: var(--color-accent); }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

strong { color: var(--color-primary); }

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-secondary);
  margin-bottom: var(--space-1);
}

/* ============ Layout ============ */
.wrap {
  max-width: 1080px;
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.prose {
  max-width: 700px;
  margin-inline: auto;
  padding-inline: var(--space-3);
}

main { display: block; padding-bottom: var(--space-7); }

/* ============ Nav ============ */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-bg) 82%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

nav.site-nav {
  max-width: 1080px;
  margin-inline: auto;
  padding: var(--space-2) var(--space-3);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.brand {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: 0.01em;
}
.brand:hover { color: var(--color-accent); }

.nav-controls { display: flex; align-items: center; gap: var(--space-2); }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.nav-links a {
  color: var(--color-secondary);
  text-decoration: none;
  padding: var(--space-1) 2px;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  left: 0; right: 100%;
  bottom: -2px;
  height: 2px;
  background: var(--color-accent);
  transition: right var(--duration) var(--ease);
}

.nav-links a:hover { color: var(--color-primary); }
.nav-links a:hover::after { right: 0; }

.nav-links a[aria-current="page"] {
  color: var(--color-primary);
  font-weight: 500;
}
.nav-links a[aria-current="page"]::after { right: 0; }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-primary);
  cursor: pointer;
  transition: background var(--duration) var(--ease), transform var(--duration) var(--ease);
}
.icon-btn:hover { background: var(--color-muted); }
.icon-btn:active { transform: scale(0.94); }
.icon-btn svg { width: 18px; height: 18px; }

.menu-toggle { display: none; }

.theme-icon-dark { display: none; }
:root[data-theme="dark"] .theme-icon-light { display: none; }
:root[data-theme="dark"] .theme-icon-dark { display: block; }

@media (max-width: 640px) {
  .menu-toggle { display: inline-flex; }
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--duration) var(--ease);
  }
  .nav-links.show { max-height: 260px; }
  .nav-links a {
    width: 100%;
    padding: var(--space-2) var(--space-3);
  }
  .nav-links a::after { display: none; }
}

/* ============ Hero ============ */
.hero {
  padding: var(--space-6) 0 var(--space-5);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-5);
  align-items: center;
}

.hero-photo {
  width: 148px;
  height: 148px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--color-border);
}

.hero-role {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--color-secondary);
  margin-top: -6px;
}

@media (max-width: 640px) {
  .hero { grid-template-columns: 1fr; text-align: center; padding-top: var(--space-5); }
  .hero-photo { margin-inline: auto; }
  p { max-width: 100%; }
}

/* ============ Reveal on scroll ============ */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 600ms var(--ease), transform 600ms var(--ease);
}
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  * { scroll-behavior: auto !important; }
}

/* ============ Book cards ============ */
.book {
  padding: var(--space-4) 0;
  border-top: 1px solid var(--color-border);
}
.book:first-of-type { border-top: none; }

.book-meta {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-secondary);
  margin-bottom: var(--space-2);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  text-decoration: none;
  color: var(--color-accent-fg);
  background: var(--color-accent);
  padding: 8px 14px;
  border-radius: 8px;
  transition: filter var(--duration) var(--ease), transform var(--duration) var(--ease);
}
.btn:hover { filter: brightness(1.08); text-decoration: none; }
.btn:active { transform: scale(0.97); }

blockquote {
  margin: var(--space-3) 0;
  padding: var(--space-2) var(--space-3);
  border-left: 2px solid var(--color-accent);
  background: var(--color-muted);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-style: italic;
}
blockquote p:last-child { margin-bottom: var(--space-1); }
blockquote cite {
  display: block;
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-secondary);
  margin-top: var(--space-1);
}

.praise-list { list-style: none; margin: 0; padding: 0; }
.praise-list li { margin-bottom: var(--space-2); }

/* ============ Project grid (Side Quests) ============ */
.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

@media (max-width: 640px) {
  .project-grid { grid-template-columns: 1fr; }
}

.project-card {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: var(--space-3);
  transition: border-color var(--duration) var(--ease), transform var(--duration) var(--ease);
}
.project-card:hover { border-color: var(--color-accent); transform: translateY(-2px); }
.project-card h3 { margin-bottom: var(--space-1); }
.project-card p { margin-bottom: var(--space-2); font-size: 0.96rem; }
.project-card .btn { background: transparent; color: var(--color-accent); border: 1px solid var(--color-border); }
.project-card .btn:hover { border-color: var(--color-accent); background: var(--color-muted); }

/* ============ Footer ============ */
footer.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-4) 0 var(--space-6);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-secondary);
}
footer.site-footer a { color: var(--color-secondary); }
footer.site-footer a:hover { color: var(--color-accent); }