/* ==========================================================================
   Design tokens
   Palette: one accent (yellow), three distinct text tiers, two surface tiers.
   Type scale: modular, ratio 1.25 (major third), base 1rem.
   Spacing: 4px base unit.
   Breakpoints: mobile < 768px, tablet 768-1023px, desktop >= 1024px.
   ========================================================================== */

:root {
  /* Surfaces */
  --color-bg: #111827;
  --color-surface: #1a2233;
  --color-surface-raised: #212b3f;
  --color-border: #2b3547;
  --color-border-strong: #5a6884; /* 3.17:1 on bg — meets WCAG 1.4.11 for the secondary button edge */

  /* Text — three tiers, each visibly distinct */
  --color-text-primary: #f8fafc; /* headings, key labels */
  --color-text-body: #cbd5e1; /* paragraphs */
  --color-text-muted: #8b96aa; /* dates, captions, metadata */

  /* Accent — links, CTAs, current-role highlight only */
  --color-accent: #facc15;
  --color-accent-ink: #14110a; /* text on accent fills */
  --color-accent-soft: rgba(250, 204, 21, 0.12);

  /* Fonts */
  --font-heading: "Fraunces", Georgia, "Times New Roman", serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;

  /* Type scale, ratio 1.25 */
  --text-xs: 0.8rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.25rem;
  --text-xl: 1.563rem;
  --text-2xl: 1.953rem;
  --text-3xl: 2.441rem;
  --text-4xl: 3.052rem;

  /* Spacing, 4px base */
  --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-24: 6rem;

  --radius: 0.5rem;
  --radius-lg: 0.875rem;
  --content-width: 1080px;
  --touch-target: 44px;
  --transition-base: 200ms ease;

  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.25), 0 4px 16px rgba(0, 0, 0, 0.18);
  --shadow-card-hover: 0 2px 4px rgba(0, 0, 0, 0.3), 0 12px 32px rgba(0, 0, 0, 0.28);
}

/* ==========================================================================
   Base
   ========================================================================== */

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-base);
  background: var(--color-bg);
  color: var(--color-text-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
}

h1,
h2 {
  font-family: var(--font-heading);
  color: var(--color-text-primary);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.015em;
}

h3 {
  color: var(--color-text-primary);
  font-weight: 600;
  line-height: 1.3;
}

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-accent);
  color: var(--color-accent-ink);
  padding: var(--space-2) var(--space-4);
  z-index: 100;
  border-radius: 0 0 var(--radius) 0;
  font-weight: 600;
  text-decoration: none;
}

.skip-link:focus {
  left: 0;
}

/* ==========================================================================
   Nav
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(17, 24, 39, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-2) var(--space-6);
  min-height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  min-height: var(--touch-target);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--text-base);
  color: var(--color-text-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  min-height: var(--touch-target);
  padding: 0 var(--space-3);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: color var(--transition-base), background var(--transition-base);
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--color-text-primary);
  background: var(--color-surface);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: var(--touch-target);
  height: var(--touch-target);
  margin-right: calc(var(--space-2) * -1);
  background: none;
  border: none;
  border-radius: var(--radius);
  color: var(--color-text-primary);
  cursor: pointer;
}

.nav-toggle:hover {
  background: var(--color-surface);
}

.nav-toggle svg {
  width: 24px;
  height: 24px;
}

.nav-toggle .icon-close {
  display: none;
}

.nav-toggle[aria-expanded="true"] .icon-menu {
  display: none;
}

.nav-toggle[aria-expanded="true"] .icon-close {
  display: block;
}

/* Collapse below 900px: six links plus the logo do not fit one row at 768px, and wrapping looks worse than a menu. */
@media (max-width: 899px) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav-links {
    display: none;
    flex-basis: 100%;
    flex-direction: column;
    gap: 0;
    padding: 0 0 var(--space-2);
  }

  .nav-links.is-open {
    display: flex;
  }

  .nav-links a {
    width: 100%;
    padding: 0 var(--space-2);
  }
}

/* ==========================================================================
   Layout helpers
   ========================================================================== */

.section {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-16) var(--space-6);
}

.section-center {
  text-align: center;
}

.section-heading {
  font-size: clamp(var(--text-xl), 3.2vw + 0.6rem, var(--text-3xl));
  margin: 0 0 var(--space-3);
}

.section-lede {
  color: var(--color-text-body);
  max-width: 40rem;
  margin: 0 0 var(--space-6);
}

.section-center .section-lede {
  margin-left: auto;
  margin-right: auto;
}

@media (min-width: 768px) {
  .section {
    padding-top: var(--space-24);
    padding-bottom: var(--space-24);
  }
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-12) var(--space-6) var(--space-16);
  display: flex;
  flex-direction: column-reverse;
  align-items: flex-start;
  gap: var(--space-8);
}

.hero-content {
  flex: 1 1 auto;
  min-width: 0;
  max-width: 44rem;
}

.hero-eyebrow {
  color: var(--color-accent);
  font-weight: 600;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0 0 var(--space-5);
}

.hero-content h1 {
  font-size: clamp(var(--text-2xl), 5.5vw + 0.5rem, var(--text-4xl));
  margin: 0 0 var(--space-6);
  text-wrap: balance;
}

.hero-summary {
  color: var(--color-text-body);
  font-size: var(--text-lg);
  line-height: 1.6;
  margin: 0 0 var(--space-6);
  max-width: 38rem;
}

.hero-tags {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin: 0 0 var(--space-10);
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3) var(--space-4);
  margin-bottom: var(--space-8);
}

.hero-photo {
  width: 128px;
  height: 128px;
  border-radius: 50%;
  overflow: hidden;
  border: 2px solid var(--color-border-strong);
  box-shadow: var(--shadow-card);
  flex: 0 0 auto;
}

.hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@media (min-width: 768px) {
  .hero {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-12);
    padding-top: var(--space-24);
    padding-bottom: var(--space-24);
  }

  .hero-photo {
    width: 192px;
    height: 192px;
  }
}

/* ==========================================================================
   Buttons — primary (filled), secondary (outline), tertiary (text link)
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: var(--touch-target);
  padding: 0 var(--space-6);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  border: 1.5px solid transparent;
  transition: background var(--transition-base), color var(--transition-base),
    border-color var(--transition-base), transform var(--transition-base);
  cursor: pointer;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: #fde047;
  border-color: #fde047;
}

.btn-secondary {
  background: transparent;
  border-color: var(--color-border-strong);
  color: var(--color-text-primary);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  border-color: var(--color-text-muted);
  background: var(--color-surface);
}

.btn-tertiary {
  padding: 0 var(--space-2);
  color: var(--color-text-body);
  text-decoration: underline;
  text-decoration-color: var(--color-border-strong);
  text-underline-offset: 4px;
}

.btn-tertiary:hover,
.btn-tertiary:focus-visible {
  color: var(--color-accent);
  text-decoration-color: var(--color-accent);
}

/* ==========================================================================
   Social icons
   ========================================================================== */

.social-row {
  display: flex;
  gap: var(--space-1);
}

.social-row a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--touch-target);
  height: var(--touch-target);
  border-radius: var(--radius);
  color: var(--color-text-muted);
  transition: color var(--transition-base), background var(--transition-base);
}

.social-row a:hover,
.social-row a:focus-visible {
  color: var(--color-text-primary);
  background: var(--color-surface);
}

.social-row svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

.social-row-center {
  justify-content: center;
  margin-top: var(--space-6);
}

.hero-ctas-center {
  justify-content: center;
}

/* ==========================================================================
   Timeline
   Desktop/tablet: date column | rail | card. Mobile: rail | (date label above card).
   ========================================================================== */

.timeline {
  --date-col: 11rem;
  --col-gap: 2.5rem;
  position: relative;
  max-width: 860px;
  margin: var(--space-10) 0 0;
  padding: 0;
  list-style: none;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 0.5rem;
  bottom: 0;
  left: 6px;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  row-gap: var(--space-2);
  padding: 0 0 var(--space-8) var(--space-8);
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-marker {
  position: absolute;
  top: 0.3rem;
  left: 0;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 2px solid var(--color-border-strong);
  transition: border-color var(--transition-base), background var(--transition-base);
}

.timeline-item:hover .timeline-marker {
  border-color: var(--color-text-muted);
}

.timeline-dates {
  margin: 0;
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}

.timeline-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition-base), transform var(--transition-base),
    box-shadow var(--transition-base);
}

.timeline-item:hover .timeline-card {
  border-color: var(--color-border-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

.timeline-employer {
  font-size: var(--text-base);
  margin: 0 0 var(--space-1);
}

.timeline-title {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-body);
  font-size: var(--text-sm);
  font-weight: 500;
  margin: 0 0 var(--space-3);
}

.timeline-highlight {
  color: var(--color-text-body);
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.7;
}

.timeline-sub {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  margin: var(--space-3) 0 0;
  padding: var(--space-3) 0 0;
  border-top: 1px solid var(--color-border);
  list-style: none;
}

/* Current role — the only place accent marks "active" */
.timeline-item.is-current .timeline-marker {
  background: var(--color-accent);
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-soft);
}

.timeline-item.is-current .timeline-card {
  border-color: rgba(250, 204, 21, 0.45);
  background: linear-gradient(180deg, var(--color-accent-soft), transparent 60%), var(--color-surface);
}

.timeline-item.is-current .timeline-dates {
  color: var(--color-accent);
}

.badge {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-accent-ink);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  line-height: 1;
  padding: 0.3rem 0.55rem;
  border-radius: 999px;
}

@media (min-width: 768px) {
  .timeline::before {
    left: calc(var(--date-col) + var(--col-gap) / 2 - 1px);
  }

  .timeline-item {
    grid-template-columns: var(--date-col) 1fr;
    column-gap: var(--col-gap);
    padding: 0 0 var(--space-10) 0;
  }

  .timeline-marker {
    left: calc(var(--date-col) + var(--col-gap) / 2 - 7px);
    top: 1.35rem;
  }

  .timeline-dates {
    text-align: right;
    padding-top: 1.1rem;
    font-size: var(--text-sm);
  }
}

/* ==========================================================================
   Capabilities grid — 3 across desktop, 2 tablet, 1 mobile; equal-height cards
   ========================================================================== */

.capabilities-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-top: var(--space-8);
}

.capability-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition-base), transform var(--transition-base),
    box-shadow var(--transition-base);
}

.capability-card:hover {
  border-color: var(--color-border-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

.capability-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-bottom: var(--space-4);
  border-radius: var(--radius);
  background: var(--color-accent-soft);
  color: var(--color-accent);
}

.capability-icon svg {
  width: 22px;
  height: 22px;
}

.capability-card h3 {
  margin: 0 0 var(--space-2);
  font-size: var(--text-base);
}

.capability-card p {
  margin: 0;
  color: var(--color-text-body);
  font-size: var(--text-sm);
}

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

/* Tablet only — scoped so it cannot outrank the desktop spans below on specificity. */
@media (min-width: 768px) and (max-width: 1023px) {
  .capability-card:last-child:nth-child(2n + 1) {
    grid-column: 1 / -1;
  }
}

/* Desktop uses a 6-column grid so an odd final row can still divide evenly.
   A normal card spans 2 (= 3 per row); the exceptions below rebalance the last row. */
@media (min-width: 1024px) {
  .capabilities-grid {
    grid-template-columns: repeat(6, 1fr);
  }

  .capability-card {
    grid-column: span 2;
  }

  /* 4 cards: the orphan takes the whole final row. */
  .capability-card:last-child:nth-child(3n + 1) {
    grid-column: 1 / -1;
  }

  /* 5 cards: the final two split the last row in half. */
  .capability-card:nth-last-child(2):nth-child(3n + 1),
  .capability-card:last-child:nth-child(3n + 2) {
    grid-column: span 3;
  }
}

.capabilities-note {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin: var(--space-6) 0 0;
}

.capabilities-note a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: rgba(250, 204, 21, 0.35);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--transition-base);
}

.capabilities-note a:hover,
.capabilities-note a:focus-visible {
  text-decoration-color: currentColor;
}

/* Proof-of-work gallery. Markup template lives (commented out) in index.html. */

.proof-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin: var(--space-8) 0 0;
  padding: 0;
  list-style: none;
}

.proof-item {
  margin: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.proof-item img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-bottom: 1px solid var(--color-border);
}

.proof-item figcaption {
  padding: var(--space-3) var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

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

@media (min-width: 1024px) {
  .proof-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ==========================================================================
   Prose sections (AI engineering / speaking)
   ========================================================================== */

.prose {
  color: var(--color-text-body);
  max-width: 44rem;
  margin: 0;
}

.prose a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: rgba(250, 204, 21, 0.35);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--transition-base);
}

.prose a:hover,
.prose a:focus-visible {
  text-decoration-color: currentColor;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-8) var(--space-6);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

/* ==========================================================================
   Scroll reveal (JS-gated, see js/main.js)
   ========================================================================== */

@media (prefers-reduced-motion: no-preference) {
  .reveal[data-animate="pending"] {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 700ms ease-out, transform 700ms ease-out;
  }

  .reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-photo picture {
  display: block;
  width: 100%;
  height: 100%;
}

/* ==========================================================================
   Print
   Recruiters do print these. Two things matter: readable ink, and the
   scroll-reveal elements must be forced visible — anything not yet scrolled
   into view is still opacity:0 and would otherwise print blank.
   ========================================================================== */

@media print {
  .reveal,
  .reveal[data-animate="pending"] {
    opacity: 1 !important;
    transform: none !important;
  }

  :root {
    --color-bg: #ffffff;
    --color-surface: #ffffff;
    --color-border: #cbd5e1;
    --color-border-strong: #94a3b8;
    --color-text-primary: #000000;
    --color-text-body: #1f2937;
    --color-text-muted: #4b5563;
    --color-accent: #7c5c00;
    --shadow-card: none;
    --shadow-card-hover: none;
  }

  body {
    background: #fff;
    color: #000;
  }

  .site-header,
  .social-row,
  .nav-toggle,
  .skip-link,
  .hero-ctas {
    display: none !important;
  }

  .section,
  .hero {
    padding: var(--space-6) 0;
    max-width: none;
  }

  .timeline-item,
  .capability-card {
    break-inside: avoid;
    page-break-inside: avoid;
  }

  .timeline-card,
  .capability-card {
    box-shadow: none;
  }

  .timeline-item.is-current .timeline-card {
    background: #fff;
  }

  /* Surface link targets that are otherwise invisible on paper. */
  .prose a::after {
    content: " (" attr(href) ")";
    font-size: 0.85em;
    color: var(--color-text-muted);
    word-break: break-all;
  }
}