/* ===== base.css ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  -moz-text-size-adjust: none; -webkit-text-size-adjust: none; text-size-adjust: none;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility; scroll-behavior: smooth;
  hanging-punctuation: first last; scroll-padding-top: var(--space-16);
}
body {
  min-height: 100dvh; line-height: 1.7; font-family: var(--font-body, serif);
  font-size: var(--text-base); color: var(--color-text); background-color: var(--color-bg);
}
img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul[role='list'], ol[role='list'], nav ul { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4, h5, h6 { text-wrap: balance; line-height: 1.2; font-family: var(--font-display); font-weight: 500; }
h2 { font-size: var(--text-2xl); letter-spacing: -0.02em; margin-bottom: var(--space-5); }
h3 { font-size: var(--text-lg); }
p, li, figcaption { text-wrap: pretty; }
::selection { background: color-mix(in oklab, var(--color-primary) 30%, transparent); color: var(--color-text); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}
button { cursor: pointer; background: none; border: none; }
table { border-collapse: collapse; width: 100%; }
a, button, [role='button'], [role='link'], input, textarea, select {
  transition: color var(--transition-interactive), background var(--transition-interactive),
    border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border-width: 0; }

/* ===== design tokens ===== */
:root {
  --text-xs: clamp(0.8125rem, 0.78rem + 0.15vw, 0.875rem);
  --text-sm: clamp(0.9375rem, 0.9rem + 0.2vw, 1.025rem);
  --text-base: clamp(1.0625rem, 1rem + 0.3vw, 1.2rem);
  --text-lg: clamp(1.125rem, 1.05rem + 0.4vw, 1.3rem);
  --text-xl: clamp(1.4rem, 1.15rem + 1vw, 1.85rem);
  --text-2xl: clamp(1.85rem, 1.2rem + 2vw, 2.75rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(2.4rem, 1.2rem + 4.4vw, 4.75rem);

  --space-1: 0.25rem; --space-2: 0.5rem; --space-3: 0.75rem; --space-4: 1rem;
  --space-5: 1.25rem; --space-6: 1.5rem; --space-8: 2rem; --space-10: 2.5rem;
  --space-12: 3rem; --space-16: 4rem; --space-20: 5rem; --space-24: 6rem; --space-32: 8rem;

  --radius-sm: 0.375rem; --radius-md: 0.5rem; --radius-lg: 0.75rem; --radius-xl: 1rem; --radius-full: 9999px;
  --transition-interactive: 180ms cubic-bezier(0.16,1,0.3,1);

  --content-narrow: 640px; --content-default: 960px; --content-wide: 1120px;

  --font-display: 'Boska', 'Iowan Old Style', 'Georgia', serif;
  --font-body: 'Source Serif 4', 'Iowan Old Style', 'Georgia', serif;
  --font-ui: 'General Sans', 'Helvetica Neue', sans-serif;

  /* Light mode — aged paper / candlelit study */
  --color-bg: #f4ecd9;
  --color-surface: #f8f2e4;
  --color-surface-2: #fbf7ee;
  --color-surface-offset: #ece2cb;
  --color-divider: #ddd0b0;
  --color-border: #cbbb92;

  --color-text: #241d13;
  --color-text-muted: #4a4230;
  --color-text-faint: #7a6f55;
  --color-text-inverse: #f8f2e4;

  --color-primary: #8f5318;
  --color-primary-hover: #7c4913;
  --color-primary-active: #5c360d;
  --color-primary-highlight: #e6d2ab;

  --color-accent-2: #3c5c50;

  --shadow-sm: 0 1px 2px rgba(30, 20, 5, 0.08);
  --shadow-md: 0 6px 20px rgba(30, 20, 5, 0.14);
  --shadow-lg: 0 18px 48px rgba(20, 12, 4, 0.28);
}

[data-theme='dark'] {
  --color-bg: #10130f;
  --color-surface: #14180f;
  --color-surface-2: #171c14;
  --color-surface-offset: #1a1f16;
  --color-divider: #262c1e;
  --color-border: #34392a;

  --color-text: #eee6d4;
  --color-text-muted: #c4bba3;
  --color-text-faint: #8d8674;
  --color-text-inverse: #14180f;

  --color-primary: #e0a45a;
  --color-primary-hover: #eab264;
  --color-primary-active: #f5c988;
  --color-primary-highlight: #3a2f1c;

  --color-accent-2: #7fa695;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.35);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.45);
  --shadow-lg: 0 24px 64px rgba(0,0,0,0.6);
}

/* ===== layout helpers ===== */
.wrap { width: 100%; max-width: var(--content-wide); margin-inline: auto; padding-inline: clamp(var(--space-5), 5vw, var(--space-12)); }
.wrap--narrow { max-width: var(--content-default); }
.section { padding-block: clamp(var(--space-16), 8vw, var(--space-24)); }
.section-label {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-family: var(--font-ui); font-size: var(--text-xs); letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--color-primary); font-weight: 600; margin-bottom: var(--space-4);
}
.section-label::before { content: ''; width: 18px; height: 1px; background: currentColor; display: inline-block; }
.section-head { max-width: 40rem; margin-bottom: var(--space-10); }
.section-head p {
  color: var(--color-text-muted); font-size: var(--text-base); line-height: 1.7; max-width: 62ch;
}
.prose p {
  color: var(--color-text-muted); font-size: var(--text-base); line-height: 1.75;
  max-width: 62ch; margin-bottom: var(--space-5);
}
.prose p:last-child { margin-bottom: 0; }

/* ===== header ===== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklab, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-divider);
  transition: transform 0.3s cubic-bezier(0.16,1,0.3,1), box-shadow var(--transition-interactive);
}
.site-header--hidden { transform: translateY(-100%); }
.site-header--scrolled { box-shadow: var(--shadow-sm); }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: var(--space-6); padding-block: var(--space-4); }
.brand { display: flex; align-items: center; gap: var(--space-3); font-family: var(--font-display); font-size: var(--text-lg); letter-spacing: 0.01em; }
.brand svg { width: 30px; height: 30px; color: var(--color-primary); flex-shrink: 0; }
.brand-text { display:flex; flex-direction:column; line-height:1.15; }
.brand-text .working { font-family: var(--font-ui); font-size: 0.7rem; text-transform: uppercase; letter-spacing:0.12em; color: var(--color-text-faint); margin-top: 0.2rem; }
nav.main-nav ul { display: flex; gap: var(--space-6); align-items:center; }
nav.main-nav a { font-family: var(--font-ui); font-size: var(--text-sm); color: var(--color-text-muted); white-space: nowrap; }
nav.main-nav a:hover { color: var(--color-primary); }
@media (min-width: 961px) {
  .nav-story { display: none; }
}
.header-actions { display:flex; align-items:center; gap: var(--space-3); }
.theme-toggle {
  width: 38px; height: 38px; border-radius: var(--radius-full); display: grid; place-items: center;
  color: var(--color-text-muted); border: 1px solid var(--color-border); flex-shrink: 0;
}
.theme-toggle:hover { color: var(--color-primary); border-color: var(--color-primary); }
.nav-toggle {
  display: none; width: 38px; height: 38px; border-radius: var(--radius-full);
  border: 1px solid var(--color-border); place-items: center; gap: 4px;
  flex-direction: column; padding: 0;
}
.nav-toggle span {
  display: block; width: 14px; height: 1.5px; background: currentColor; border-radius: 1px;
}
.nav-toggle[aria-expanded='true'] span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.nav-toggle[aria-expanded='true'] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded='true'] span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }
.nav-toggle span { transition: transform 160ms ease, opacity 160ms ease; }

/* ===== buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-family: var(--font-ui); font-size: var(--text-sm); font-weight: 600;
  padding: 0.7rem 1.25rem; border-radius: var(--radius-full);
  border: 1px solid transparent; white-space: nowrap;
}
.btn-primary { background: var(--color-primary); color: var(--color-text-inverse); box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--color-primary-hover); box-shadow: var(--shadow-md); transform: translateY(-1px); }
.btn-ghost { border-color: var(--color-border); color: var(--color-text); }
.btn-ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn-on-dark { color: #f4ecd9; border-color: rgba(244,236,217,0.4); }
.btn-on-dark:hover { color: #fff8ea; border-color: rgba(244,236,217,0.75); }

/* ===== hero ===== */
.hero {
  position: relative; min-height: min(86vh, 46rem); display: flex; align-items: flex-end;
  overflow: hidden; isolation: isolate; background: #0c0e0b;
}
.hero-bg { position: absolute; inset: 0; z-index: -2; background: #0c0e0b; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; object-position: 62% 40%; }
.hero-bg::after {
  content: ''; position: absolute; inset: 0;
  background:
    linear-gradient(90deg, rgba(8,10,7,0.82) 0%, rgba(8,10,7,0.42) 42%, rgba(8,10,7,0.18) 68%, rgba(8,10,7,0.28) 100%),
    linear-gradient(180deg, rgba(12,14,11,0.2) 0%, rgba(12,14,11,0.28) 40%, rgba(8,10,7,0.9) 100%);
}
.hero-inner {
  position: relative; z-index: 1;
  padding-block: clamp(var(--space-16), 10vw, var(--space-24)) clamp(var(--space-10), 6vw, var(--space-16));
  color: #f4ecd9;
}
.hero .section-label { color: #e6c087; }
.hero h1 {
  font-size: var(--text-hero); max-width: 16ch; color: #f8f2e4;
  text-shadow: 0 2px 24px rgba(0,0,0,0.35); margin-bottom: 0;
}
.hero-sub {
  margin-top: var(--space-6); font-size: var(--text-lg); line-height: 1.65;
  max-width: 42ch; color: #efe4cb; font-family: var(--font-body);
  text-shadow: 0 1px 12px rgba(0,0,0,0.55);
}
.hero-meta { margin-top: var(--space-8); display: flex; flex-wrap: wrap; gap: var(--space-4); align-items: center; }
.hero-meta .working-tag {
  font-family: var(--font-ui); font-size: var(--text-xs); letter-spacing: 0.1em; text-transform: uppercase;
  color: #d8ccb0;
}

/* ===== idea / intro ===== */
.idea-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: clamp(var(--space-10), 6vw, var(--space-16)); align-items: start; }
.idea-grid h2 { max-width: 18ch; }
.pull-quote,
.prose p.pull-quote {
  font-family: var(--font-display); font-size: var(--text-xl); font-style: italic; color: var(--color-primary);
  border-left: 3px solid var(--color-primary); padding-left: var(--space-5); margin-block: var(--space-8);
  max-width: 36ch; line-height: 1.4;
}
.idea-figure { position: sticky; top: calc(var(--space-24)); }
.idea-figure img { width: 100%; border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); }
.idea-figure figcaption {
  margin-top: var(--space-3); font-size: var(--text-xs); line-height: 1.5;
  color: var(--color-text-faint); font-family: var(--font-ui); max-width: 42ch;
}

/* ===== pillars ===== */
.pillars { background: var(--color-surface); border-top: 1px solid var(--color-divider); border-bottom: 1px solid var(--color-divider); }
.pillar-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-5); }
.pillar-card {
  background: var(--color-surface-2); border: 1px solid var(--color-divider); border-radius: var(--radius-lg);
  padding: 1.75rem var(--space-6); display: flex; flex-direction: column; gap: var(--space-3); height: 100%;
}
.pillar-card .num { font-family: var(--font-display); font-size: var(--text-xl); color: var(--color-primary); line-height: 1; }
.pillar-card h3 { font-size: var(--text-lg); font-weight: 600; font-family: var(--font-ui); }
.pillar-card p { font-size: var(--text-sm); line-height: 1.65; color: var(--color-text-muted); }

/* ===== comps / lineage strip ===== */
.book-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-5); }
.book-card {
  border: 1px solid var(--color-divider); border-radius: var(--radius-lg); padding: var(--space-6);
  background: var(--color-surface); display:flex; flex-direction:column; gap: var(--space-2); height: 100%;
}
.book-card .title { font-family: var(--font-display); font-size: var(--text-lg); font-weight: 500; line-height: 1.25; }
.book-card .author { font-family: var(--font-ui); font-size: var(--text-xs); color: var(--color-text-faint); text-transform: uppercase; letter-spacing: 0.06em; }
.book-card p { font-size: var(--text-sm); line-height: 1.6; color: var(--color-text-muted); margin-top: var(--space-2); }

/* ===== author ===== */
.author-grid { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: clamp(var(--space-10), 6vw, var(--space-16)); align-items: center; }
.author-portrait {
  aspect-ratio: 4/5; border-radius: var(--radius-lg); background: var(--color-surface-offset);
  border: 1px solid var(--color-divider); display: grid; place-items: center; color: var(--color-text-faint);
  font-family: var(--font-ui); font-size: var(--text-sm); text-align: center; padding: var(--space-8);
  letter-spacing: 0.04em;
}
.author-copy .tag-list { display:flex; flex-wrap:wrap; gap: var(--space-2); margin-top: var(--space-6); }
.tag {
  font-family: var(--font-ui); font-size: var(--text-xs); border: 1px solid var(--color-border);
  border-radius: var(--radius-full); padding: 0.4rem 0.85rem; color: var(--color-text-muted);
}

/* ===== research CTA ===== */
.research {
  background: var(--color-text); color: var(--color-text-inverse); border-radius: var(--radius-xl);
  padding: clamp(var(--space-10), 5vw, var(--space-16));
  display: grid; grid-template-columns: 1.1fr 0.9fr; gap: clamp(var(--space-8), 5vw, var(--space-12)); align-items: center;
}
[data-theme='dark'] .research {
  background: var(--color-surface-2);
  border: 1px solid var(--color-divider);
  color: var(--color-text);
}
.research .section-label { color: var(--color-primary); }
.research h2 { font-size: var(--text-2xl); margin-bottom: var(--space-5); color: inherit; }
.research p { color: inherit; opacity: 0.9; font-size: var(--text-base); line-height: 1.7; margin-bottom: var(--space-6); max-width: 46ch; }
.research .btn-primary { background: var(--color-primary); color: var(--color-text-inverse); }
.research-questions { display:flex; flex-direction:column; gap: var(--space-3); }
.research-questions .q {
  font-family: var(--font-ui); font-size: var(--text-sm); line-height: 1.45;
  padding: var(--space-4) var(--space-5);
  border: 1px solid rgba(244,236,217,0.28); border-radius: var(--radius-md);
}
[data-theme='dark'] .research-questions .q { border-color: var(--color-divider); }

/* ===== updates / contact ===== */
.updates { padding-top: clamp(var(--space-12), 6vw, var(--space-16)); }
.contact-grid { display:grid; grid-template-columns: 1fr 1fr; gap: var(--space-5); }
.contact-card {
  background: var(--color-surface); border: 1px solid var(--color-divider); border-radius: var(--radius-lg);
  padding: var(--space-8) var(--space-6); display: flex; flex-direction: column; gap: var(--space-3);
}
.contact-card h3 { font-size: var(--text-lg); font-family: var(--font-ui); font-weight: 600; }
.contact-card p { color: var(--color-text-muted); font-size: var(--text-sm); line-height: 1.65; max-width: 48ch; }
.contact-card .btn { margin-top: var(--space-3); align-self: flex-start; }

/* ===== footer ===== */
footer.site-footer { border-top: 1px solid var(--color-divider); padding-block: var(--space-8); }
.footer-inner { display:flex; align-items:center; justify-content:space-between; flex-wrap: wrap; gap: var(--space-4); }
.footer-inner p { font-family: var(--font-ui); font-size: var(--text-xs); line-height: 1.5; color: var(--color-text-faint); max-width: 62ch; }

/* ===== reveal ===== */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.7s cubic-bezier(0.16,1,0.3,1), transform 0.7s cubic-bezier(0.16,1,0.3,1); }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ===== responsive ===== */
@media (max-width: 960px) {
  nav.main-nav {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    background: color-mix(in oklab, var(--color-bg) 96%, transparent);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-divider);
    padding: var(--space-4) clamp(var(--space-5), 5vw, var(--space-12)) var(--space-6);
  }
  nav.main-nav.is-open { display: block; }
  nav.main-nav ul { flex-direction: column; align-items: flex-start; gap: var(--space-1); }
  nav.main-nav a { display: block; padding: var(--space-3) 0; font-size: var(--text-base); }
  .nav-toggle { display: flex; }
  .header-cta { display: none; }
}

@media (max-width: 900px) {
  .idea-grid, .author-grid, .research, .contact-grid { grid-template-columns: 1fr; }
  .idea-figure { position: static; }
  .pillar-grid { grid-template-columns: 1fr; }
  .book-row { grid-template-columns: repeat(2, 1fr); }
  .author-grid { display: flex; flex-direction: column-reverse; }
  .hero { min-height: min(78vh, 40rem); }
  .hero-bg img { object-position: 78% 45%; }
  .hero-bg::after {
    background:
      linear-gradient(180deg, rgba(8,10,7,0.55) 0%, rgba(8,10,7,0.72) 48%, rgba(8,10,7,0.94) 100%);
  }
}

@media (max-width: 560px) {
  .book-row { grid-template-columns: 1fr; }
  .header-inner { gap: var(--space-3); }
  .brand { font-size: var(--text-base); }
  .brand-text .working { display: none; }
  .hero h1 { max-width: 12ch; }
  .hero-meta { flex-direction: column; align-items: flex-start; gap: var(--space-4); }
}