/* ============================================================
   ikeohu.com — design system
   ============================================================ */

:root {
  /* Color */
  --paper:        #FAF7F2;
  --paper-warm:   #F5F0E6;
  --ink:          #1A1815;
  --ink-soft:     #3D3936;
  --ink-muted:    #6B6560;
  --ink-faint:    #9C958D;
  --oxblood:      #7C2D2D;
  --oxblood-deep: #5C1F1F;
  --tan:          #C4A57B;
  --rule:         #E8E2D8;
  --rule-soft:    #F0EBE0;

  /* Type */
  --serif:  'Fraunces', 'Iowan Old Style', Georgia, serif;
  --sans:   'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono:   'JetBrains Mono', 'SF Mono', Menlo, Consolas, monospace;

  /* Spacing scale (1.5x ratio) */
  --s-1: 0.25rem;
  --s-2: 0.5rem;
  --s-3: 0.75rem;
  --s-4: 1rem;
  --s-5: 1.5rem;
  --s-6: 2.25rem;
  --s-7: 3.375rem;
  --s-8: 5rem;
  --s-9: 7.5rem;
  --s-10: 11rem;

  /* Layout */
  --container:  1200px;
  --prose:      680px;
  --measure:    62ch;
}

/* ============================================================
   reset & base
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }

html {
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

@media (min-width: 768px) {
  html { font-size: 18px; }
}

body {
  margin: 0;
  font-family: var(--sans);
  font-weight: 400;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  background-image:
    radial-gradient(ellipse at top left, rgba(124,45,45,0.025), transparent 40%),
    radial-gradient(ellipse at bottom right, rgba(196,165,123,0.04), transparent 50%);
  background-attachment: fixed;
  min-height: 100vh;
}

/* subtle paper grain */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.4;
  background-image:
    url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.1 0 0 0 0 0.09 0 0 0 0 0.08 0 0 0 0.06 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  z-index: 1;
}

main, header, footer, nav, section, article { position: relative; z-index: 2; }

/* ============================================================
   typography
   ============================================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--serif);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--ink);
  margin: 0 0 var(--s-4);
  font-variation-settings: 'opsz' 144, 'SOFT' 0;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 350;
  letter-spacing: -0.025em;
  line-height: 1.05;
}

h2 {
  font-size: clamp(1.875rem, 3.5vw, 2.625rem);
  font-weight: 400;
  letter-spacing: -0.02em;
}

h3 {
  font-size: clamp(1.375rem, 2vw, 1.625rem);
  font-weight: 500;
  letter-spacing: -0.01em;
}

h4 {
  font-size: 1.125rem;
  font-weight: 500;
  font-family: var(--sans);
  letter-spacing: 0;
}

p { margin: 0 0 var(--s-5); max-width: var(--measure); }
p:last-child { margin-bottom: 0; }

a {
  color: var(--ink);
  text-decoration: none;
  background-image: linear-gradient(var(--oxblood), var(--oxblood));
  background-size: 100% 1px;
  background-position: 0 100%;
  background-repeat: no-repeat;
  transition: background-size 200ms ease, color 200ms ease;
}
a:hover {
  color: var(--oxblood);
  background-size: 100% 2px;
}

/* Inline emphasis */
em, i { font-style: italic; }
strong, b { font-weight: 600; color: var(--ink); }

/* Eyebrow / label text */
.eyebrow {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--oxblood);
  margin-bottom: var(--s-4);
  display: inline-block;
}

.eyebrow.muted { color: var(--ink-muted); }

/* Drop cap on long-form */
.dropcap::first-letter {
  font-family: var(--serif);
  font-size: 4.5rem;
  font-weight: 350;
  line-height: 0.9;
  float: left;
  padding: 0.45rem 0.6rem 0 0;
  color: var(--oxblood);
}

/* ============================================================
   layout primitives
   ============================================================ */

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--s-5);
}
@media (min-width: 768px) {
  .container { padding: 0 var(--s-6); }
}

.prose {
  max-width: var(--prose);
  margin: 0 auto;
}

.prose-wide { max-width: 880px; margin: 0 auto; }

.stack > * + * { margin-top: var(--s-5); }
.stack-tight > * + * { margin-top: var(--s-3); }
.stack-loose > * + * { margin-top: var(--s-7); }

.center { text-align: center; }

/* Horizontal rule */
hr.rule {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: var(--s-7) 0;
}

hr.rule-soft {
  border: 0;
  border-top: 1px solid var(--rule-soft);
  margin: var(--s-6) 0;
}

/* ============================================================
   navigation
   ============================================================ */

.site-header {
  padding: var(--s-5) 0;
  border-bottom: 1px solid var(--rule);
  background: rgba(250, 247, 242, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-5);
}

.brand {
  font-family: var(--serif);
  font-size: 1.375rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink);
  background: none;
  display: flex;
  align-items: baseline;
  gap: var(--s-2);
}

.brand:hover { color: var(--oxblood); background: none; }

.brand-mark {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--ink-muted);
}

.nav-links {
  display: none;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--s-6);
}

@media (min-width: 768px) {
  .nav-links { display: flex; }
}

.nav-links a {
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink-soft);
  background: none;
  letter-spacing: 0;
}
.nav-links a:hover { color: var(--oxblood); background: none; }
.nav-links a.active { color: var(--oxblood); }

/* Mobile menu toggle */
.menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 0;
}
.menu-toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--ink);
  transition: transform 200ms ease;
}
@media (min-width: 768px) {
  .menu-toggle { display: none; }
}

.mobile-menu {
  display: none;
  padding: var(--s-5) 0;
  border-top: 1px solid var(--rule);
}
.mobile-menu.open { display: block; }
.mobile-menu ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--s-4);
}
.mobile-menu a {
  font-family: var(--sans);
  font-size: 1.125rem;
  color: var(--ink-soft);
  background: none;
}

/* ============================================================
   hero
   ============================================================ */

.hero {
  padding: var(--s-9) 0 var(--s-8);
  position: relative;
}

.hero-grid {
  display: grid;
  gap: var(--s-7);
  grid-template-columns: 1fr;
  align-items: end;
}

@media (min-width: 900px) {
  .hero-grid { grid-template-columns: 3fr 2fr; gap: var(--s-8); }
}

.hero-headline {
  font-size: clamp(2.5rem, 7vw, 5rem);
  font-weight: 300;
  line-height: 0.98;
  letter-spacing: -0.03em;
  margin: 0 0 var(--s-6);
  font-variation-settings: 'opsz' 144;
}

.hero-headline em {
  font-style: italic;
  color: var(--oxblood);
  font-weight: 350;
}

.hero-lede {
  font-size: 1.25rem;
  line-height: 1.5;
  color: var(--ink-soft);
  max-width: 30em;
}

.hero-meta {
  font-family: var(--mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--ink-muted);
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-3) var(--s-5);
  margin-top: var(--s-6);
  padding-top: var(--s-5);
  border-top: 1px solid var(--rule);
}

.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
}
.hero-meta span::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--oxblood);
}

/* ============================================================
   sections
   ============================================================ */

.section {
  padding: var(--s-8) 0;
}

@media (min-width: 768px) {
  .section { padding: var(--s-9) 0; }
}

.section-tight { padding: var(--s-7) 0; }

.section-head {
  margin-bottom: var(--s-7);
  max-width: 800px;
}

.section-head h2 {
  margin-bottom: var(--s-4);
}

.section-head p {
  font-size: 1.125rem;
  color: var(--ink-soft);
}

/* Section number marker */
.section-number {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--ink-faint);
  text-transform: uppercase;
  margin-bottom: var(--s-3);
  display: block;
}

/* ============================================================
   pillar cards (three-up grid)
   ============================================================ */

.pillars {
  display: grid;
  gap: 0;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--rule);
}

@media (min-width: 768px) {
  .pillars { grid-template-columns: repeat(3, 1fr); }
}

.pillar {
  padding: var(--s-7) 0;
  border-bottom: 1px solid var(--rule);
  position: relative;
}

@media (min-width: 768px) {
  .pillar {
    padding: var(--s-7) var(--s-6) var(--s-7) 0;
    border-bottom: 0;
    border-right: 1px solid var(--rule);
  }
  .pillar:last-child { border-right: 0; padding-right: 0; }
  .pillar:not(:first-child) { padding-left: var(--s-6); }
  .pillar:nth-child(2) { padding-left: var(--s-6); }
}

.pillar-num {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--oxblood);
  text-transform: uppercase;
  margin-bottom: var(--s-4);
  display: block;
}

.pillar h3 {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 450;
  margin-bottom: var(--s-4);
  letter-spacing: -0.015em;
}

.pillar p {
  font-size: 0.98rem;
  color: var(--ink-soft);
  line-height: 1.55;
}

.pillar ul {
  list-style: none;
  padding: 0;
  margin: var(--s-4) 0 0;
  font-size: 0.875rem;
  color: var(--ink-muted);
}

.pillar ul li {
  padding: var(--s-2) 0;
  border-top: 1px solid var(--rule-soft);
  font-family: var(--mono);
  letter-spacing: 0.02em;
  font-size: 0.78rem;
  text-transform: uppercase;
}

/* ============================================================
   featured insight
   ============================================================ */

.featured-insight {
  background: var(--paper-warm);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: var(--s-7) var(--s-6);
  position: relative;
  overflow: hidden;
}

@media (min-width: 768px) {
  .featured-insight { padding: var(--s-8) var(--s-7); }
}

.featured-insight::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px;
  height: 100%;
  background: var(--oxblood);
}

.featured-insight .eyebrow { color: var(--oxblood); }

.featured-insight h3 {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 3vw, 2.125rem);
  font-weight: 400;
  line-height: 1.2;
  margin-bottom: var(--s-4);
  letter-spacing: -0.02em;
}

.featured-insight h3 a {
  color: var(--ink);
  background: none;
}
.featured-insight h3 a:hover { color: var(--oxblood); }

.featured-insight p {
  font-size: 1.0625rem;
  color: var(--ink-soft);
  margin-bottom: var(--s-5);
}

/* ============================================================
   cv / metrics list
   ============================================================ */

.metrics {
  display: grid;
  gap: var(--s-5);
  grid-template-columns: repeat(2, 1fr);
}

@media (min-width: 768px) {
  .metrics { grid-template-columns: repeat(4, 1fr); gap: var(--s-6); }
}

.metric {
  border-top: 1px solid var(--ink);
  padding-top: var(--s-4);
}

.metric-value {
  font-family: var(--serif);
  font-size: clamp(2.25rem, 4vw, 3rem);
  font-weight: 350;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: var(--s-3);
  font-variation-settings: 'opsz' 144;
}

.metric-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
  line-height: 1.4;
}

/* ============================================================
   article list (insights index)
   ============================================================ */

.article-list {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px solid var(--ink);
}

.article-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-3);
  padding: var(--s-6) 0;
  border-bottom: 1px solid var(--rule);
  transition: padding 200ms ease;
}

@media (min-width: 768px) {
  .article-row {
    grid-template-columns: 140px 1fr auto;
    gap: var(--s-6);
    align-items: baseline;
  }
}

.article-row:hover { padding-left: var(--s-3); }

.article-date {
  font-family: var(--mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-muted);
}

.article-title {
  font-family: var(--serif);
  font-size: 1.375rem;
  font-weight: 450;
  line-height: 1.25;
  letter-spacing: -0.015em;
}

.article-title a {
  color: var(--ink);
  background: none;
}
.article-title a:hover { color: var(--oxblood); }

.article-summary {
  font-size: 0.95rem;
  color: var(--ink-soft);
  margin-top: var(--s-3);
  max-width: 56ch;
}

.article-tag {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--oxblood);
}

.article-status {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-faint);
  font-style: italic;
}

/* ============================================================
   long-form article
   ============================================================ */

.article-header {
  padding: var(--s-8) 0 var(--s-7);
  border-bottom: 1px solid var(--rule);
  margin-bottom: var(--s-7);
}

.article-meta {
  font-family: var(--mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-muted);
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-4);
  margin-bottom: var(--s-5);
}

.article-meta .sep::before {
  content: '·';
  margin-right: var(--s-4);
  color: var(--ink-faint);
}

.article-h1 {
  font-size: clamp(2.25rem, 5.5vw, 3.75rem);
  font-weight: 350;
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin-bottom: var(--s-5);
  max-width: 18ch;
}

.article-deck {
  font-family: var(--serif);
  font-size: 1.375rem;
  font-style: italic;
  font-weight: 350;
  line-height: 1.4;
  color: var(--ink-soft);
  max-width: 36em;
}

.article-body {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--ink);
}

.article-body p { font-size: 1.125rem; line-height: 1.7; max-width: var(--measure); }
.article-body h2 {
  font-size: 1.875rem;
  margin-top: var(--s-7);
  margin-bottom: var(--s-4);
}
.article-body h3 {
  font-size: 1.375rem;
  margin-top: var(--s-6);
  margin-bottom: var(--s-3);
}

.article-body blockquote {
  margin: var(--s-6) 0;
  padding: var(--s-2) 0 var(--s-2) var(--s-5);
  border-left: 2px solid var(--oxblood);
  font-family: var(--serif);
  font-size: 1.25rem;
  font-style: italic;
  color: var(--ink-soft);
}

.article-body ul, .article-body ol {
  margin: 0 0 var(--s-5);
  padding-left: var(--s-5);
  max-width: var(--measure);
}

.article-body li {
  margin-bottom: var(--s-3);
  line-height: 1.6;
}

/* ============================================================
   publication list
   ============================================================ */

.pub-list {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: pub;
}

.pub-item {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: var(--s-4);
  padding: var(--s-5) 0;
  border-bottom: 1px solid var(--rule);
  counter-increment: pub;
}

.pub-item::before {
  content: counter(pub, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--oxblood);
  padding-top: 0.35rem;
}

.pub-citation {
  font-size: 1rem;
  line-height: 1.5;
  color: var(--ink);
}

.pub-citation em {
  font-style: italic;
  color: var(--ink-soft);
}

.pub-meta {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-muted);
  margin-top: var(--s-2);
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-4);
}

.pub-citations {
  color: var(--oxblood);
  font-weight: 500;
}

/* ============================================================
   buttons
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--s-3);
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0;
  padding: 0.85rem 1.5rem;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  border-radius: 1px;
  cursor: pointer;
  transition: background 180ms ease, transform 180ms ease;
}

.btn:hover {
  background: var(--oxblood);
  border-color: var(--oxblood);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--ink);
}
.btn-ghost:hover {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
  transform: translateY(-1px);
}

.btn-link {
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--oxblood);
  background: none;
  display: inline-flex;
  align-items: center;
  gap: var(--s-3);
  padding: 0;
  border: 0;
  cursor: pointer;
}

.btn-link::after {
  content: '→';
  transition: transform 180ms ease;
  font-family: var(--sans);
}

.btn-link:hover { color: var(--oxblood-deep); background: none; }
.btn-link:hover::after { transform: translateX(4px); }

/* ============================================================
   contact / form
   ============================================================ */

.contact-grid {
  display: grid;
  gap: var(--s-7);
  grid-template-columns: 1fr;
}

@media (min-width: 900px) {
  .contact-grid { grid-template-columns: 1fr 1.2fr; gap: var(--s-8); }
}

.contact-info dl {
  display: grid;
  gap: var(--s-5);
  margin: 0;
}

.contact-info dt {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--ink-muted);
  margin-bottom: var(--s-2);
}

.contact-info dd {
  margin: 0;
  font-size: 1.05rem;
  font-family: var(--serif);
}

/* ============================================================
   footer
   ============================================================ */

.site-footer {
  margin-top: var(--s-9);
  padding: var(--s-7) 0 var(--s-6);
  border-top: 1px solid var(--rule);
}

.footer-grid {
  display: grid;
  gap: var(--s-6);
  grid-template-columns: 1fr;
  margin-bottom: var(--s-6);
}

@media (min-width: 768px) {
  .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
}

.footer-brand {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 450;
}

.footer-brand p {
  font-family: var(--sans);
  font-size: 0.9rem;
  color: var(--ink-muted);
  margin-top: var(--s-2);
}

.footer-col h5 {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--ink-muted);
  margin: 0 0 var(--s-3);
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-col li { margin-bottom: var(--s-2); }

.footer-col a {
  font-size: 0.92rem;
  color: var(--ink-soft);
  background: none;
}
.footer-col a:hover { color: var(--oxblood); background: none; }

.footer-base {
  padding-top: var(--s-5);
  border-top: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-4);
  justify-content: space-between;
  align-items: center;
}

.footer-base p {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  text-transform: uppercase;
  margin: 0;
}

/* ============================================================
   misc utilities & detail
   ============================================================ */

.text-center { text-align: center; }
.muted { color: var(--ink-muted); }

/* Selection */
::selection {
  background: var(--oxblood);
  color: var(--paper);
}

/* Focus outline */
:focus-visible {
  outline: 2px solid var(--oxblood);
  outline-offset: 3px;
}

/* Animated reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 700ms cubic-bezier(0.2, 0.7, 0.2, 1), transform 700ms cubic-bezier(0.2, 0.7, 0.2, 1);
}
.reveal.in { opacity: 1; transform: translateY(0); }

/* Decorative ornament */
.ornament {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  color: var(--oxblood);
  margin: var(--s-7) 0;
}

.ornament::before, .ornament::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--rule);
}

.ornament-mark {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-style: italic;
  font-weight: 350;
  letter-spacing: 0.5em;
}

/* Print */
@media print {
  body::before { display: none; }
  .site-header, .site-footer { display: none; }
}