/* =========================================================
   Design tokens
   ========================================================= */
:root {
  --paper: #FCFBF8;
  --paper-alt: #F3F0E8;
  --ink: #161511;
  --ink-soft: #55534B;
  --line: #DCD6C7;
  --line-strong: #161511;
  --accent: #B8410A;
  --accent-ink: #FFFFFF;
  --status-ongoing-bg: #FCEEDD;
  --status-ongoing-fg: #8A4300;
  --status-done-bg: #E8EFE4;
  --status-done-fg: #33622F;

  --radius: 2px;
  --max-width: 1080px;
  --prose-width: 62ch;

  --font-sans: "IBM Plex Sans", -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #131210;
    --paper-alt: #1B1A16;
    --ink: #F2EFE6;
    --ink-soft: #A8A392;
    --line: #37352C;
    --line-strong: #F2EFE6;
    --accent: #FF8A4C;
    --accent-ink: #161511;
    --status-ongoing-bg: #362510;
    --status-ongoing-fg: #F5B87A;
    --status-done-bg: #1D2B1B;
    --status-done-fg: #8FCB86;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

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

/* =========================================================
   Nav
   ========================================================= */
.site-header {
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: var(--paper);
  z-index: 10;
}

.nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-4) var(--space-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: var(--space-5);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-family: var(--font-mono);
  color: var(--ink-soft);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 2px solid transparent;
}

.nav-links a:hover { color: var(--ink); }

.nav-links a.active {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--ink);
  margin: 5px 0;
}

@media (max-width: 640px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    gap: 0;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links li { border-top: 1px solid var(--line); }
  .nav-links a { display: block; padding: var(--space-4) var(--space-5); border-bottom: none; }
  .nav-links a.active { background: var(--paper-alt); }
}

/* =========================================================
   Sections / typography
   ========================================================= */
main { padding: var(--space-8) 0 var(--space-9); }
section + section { margin-top: var(--space-8); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin: 0 0 var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--accent);
}

h1, h2, h3, h4 { font-weight: 600; letter-spacing: -0.01em; }
h1 { font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem); line-height: 0.98; letter-spacing: -0.03em; margin: 0 0 var(--space-4); }
h2 { font-size: 1.5rem; margin: 0 0 var(--space-4); }
h3 { font-size: 1.1rem; margin: 0 0 var(--space-2); }
p { margin: 0 0 var(--space-4); color: var(--ink); }
.lede { font-size: 1.15rem; color: var(--ink-soft); max-width: 56ch; }
.text-muted { color: var(--ink-soft); }

/* section heading with accent tick */
.section-heading {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  font-weight: 500;
  margin: 0 0 var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.section-heading::before { content: "›"; color: var(--accent); font-weight: 700; }

/* =========================================================
   Buttons
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 12px 22px;
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 0.9rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border: 1px solid var(--line-strong);
  cursor: pointer;
  text-decoration: none;
  transition: background 150ms var(--ease-out), color 150ms var(--ease-out);
}

.btn-primary {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.btn-primary:hover { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); text-decoration: none; }

.btn-secondary {
  background: transparent;
  color: var(--ink);
}
.btn-secondary:hover { background: var(--ink); color: var(--paper); text-decoration: none; }

.btn-row { display: flex; gap: var(--space-3); flex-wrap: wrap; margin-top: var(--space-6); }

/* =========================================================
   Hero title-block
   ========================================================= */
.hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  padding-bottom: var(--space-7);
  border-bottom: 1px solid var(--line);
}

@media (min-width: 800px) {
  .hero { grid-template-columns: 2fr 1fr; align-items: end; }
}

.hero-titleblock {
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  align-self: start;
}
.hero-titleblock dl { margin: 0; display: grid; grid-template-columns: auto 1fr; }
.hero-titleblock dt {
  padding: var(--space-3) var(--space-4);
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}
.hero-titleblock dd {
  margin: 0;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--line);
  color: var(--ink);
}
.hero-titleblock dt:last-of-type,
.hero-titleblock dd:last-of-type { border-bottom: none; }

/* =========================================================
   Index list (projects)
   ========================================================= */
.index-list { border-top: 1px solid var(--line); }

.index-row {
  display: grid;
  grid-template-columns: 3rem 1fr auto;
  gap: var(--space-5);
  align-items: baseline;
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  transition: background 150ms var(--ease-out), padding-left 150ms var(--ease-out);
}

.index-row:hover {
  text-decoration: none;
  color: inherit;
  background: var(--paper-alt);
  padding-left: var(--space-3);
}

.index-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
}

.index-body h3 { margin-bottom: var(--space-2); font-size: 1.3rem; }
.index-body p { color: var(--ink-soft); margin-bottom: var(--space-3); max-width: 56ch; }

.index-meta {
  text-align: right;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
  white-space: nowrap;
}
.index-meta .status { display: inline-block; margin-bottom: var(--space-2); }

@media (max-width: 640px) {
  .index-row { grid-template-columns: 2rem 1fr; }
  .index-meta { grid-column: 1 / -1; text-align: left; display: flex; gap: var(--space-3); align-items: center; }
}

/* =========================================================
   Tags / status (mono bracket labels)
   ========================================================= */
.tags { display: flex; flex-wrap: wrap; gap: var(--space-2); margin: 0 0 var(--space-2); }

.tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.tag::before { content: "#"; color: var(--line-strong); opacity: 0.4; margin-right: 1px; }

.status {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 8px;
  border-radius: var(--radius);
  font-weight: 500;
}
.status-progress { background: var(--status-ongoing-bg); color: var(--status-ongoing-fg); }
.status-done { background: var(--status-done-bg); color: var(--status-done-fg); }

/* =========================================================
   Filter tabs (projects page)
   ========================================================= */
.filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.filter-tab {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  transition: background 150ms var(--ease-out), color 150ms var(--ease-out), border-color 150ms var(--ease-out);
}

.filter-tab:hover { border-color: var(--line-strong); color: var(--ink); }

.filter-tab.active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.filter-group { margin-top: var(--space-7); }
.filter-group:first-of-type { margin-top: var(--space-6); }
.filter-group.is-hidden { display: none; }

/* =========================================================
   Case study page
   ========================================================= */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-6);
  color: var(--ink-soft);
  text-decoration: none;
}
.back-link:hover { color: var(--accent); }

.case-hero { margin-bottom: var(--space-7); }
.case-hero h1 { font-size: clamp(2rem, 4vw + 0.5rem, 3.2rem); }

.case-hero-grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--space-7);
  align-items: start;
}
.case-hero-copy { min-width: 0; }
.case-hero-grid .case-hero-video { margin: 0; }
.case-hero-grid .case-hero-video video { aspect-ratio: 9 / 16; height: auto; }
@media (max-width: 800px) {
  .case-hero-grid { grid-template-columns: 1fr; }
  .case-hero-grid .case-hero-video { max-width: 320px; margin: var(--space-5) auto 0; }
}

.spec-block {
  border: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: var(--space-6) 0;
}
.spec-block > div {
  padding: var(--space-4);
  border-right: 1px solid var(--line);
}
.spec-block > div:last-child { border-right: none; }
.spec-block dt {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  margin-bottom: var(--space-2);
}
.spec-block dd { margin: 0; font-size: 0.9rem; font-weight: 500; }

@media (max-width: 700px) {
  .spec-block { grid-template-columns: repeat(2, 1fr); }
  .spec-block > div:nth-child(2) { border-right: none; }
}

.hatch {
  aspect-ratio: 16 / 7;
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--paper-alt);
  background-image: repeating-linear-gradient(135deg, var(--line) 0, var(--line) 1px, transparent 1px, transparent 12px);
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.hatch span {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: var(--space-2) var(--space-3);
}

.case-section { margin-bottom: var(--space-7); }

/* Wide screens: move the section label into a left rail (same pattern as the
   resume timeline) so body copy runs in one measured column instead of
   stranding the right half of the page. */
@media (min-width: 900px) {
  .case-section {
    display: grid;
    grid-template-columns: 11rem 1fr;
    gap: 0 var(--space-6);
    align-items: start;
    border-top: 1px solid var(--line);
    padding-top: var(--space-5);
  }
  .case-section > .section-heading {
    grid-column: 1;
    grid-row: 1;
    margin: 0;
    padding: 0;
    border-bottom: none;
  }
  .case-section > *:not(.section-heading) { grid-column: 2; }
  .case-section .prose { max-width: 68ch; }
}

.figure { border: 1px solid var(--line); margin: var(--space-5) 0; overflow: hidden; position: relative; }
.figure img,
.figure video {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: var(--paper-alt);
}

.figure-expand {
  position: absolute;
  bottom: var(--space-3);
  right: var(--space-3);
  z-index: 2;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1;
}
.figure-expand:hover { background: rgba(0, 0, 0, 0.8); }

.figure:fullscreen,
.figure:-webkit-full-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: #000;
}
.figure:fullscreen video,
.figure:-webkit-full-screen video {
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: 100%;
  aspect-ratio: auto;
  object-fit: contain;
  background: #000;
}
.figure:fullscreen .figure-caption,
.figure:-webkit-full-screen .figure-caption { display: none; }

.figure-caption {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-soft);
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--line);
  background: var(--paper-alt);
}

.gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  margin: var(--space-5) 0;
}
.gallery .figure { margin: 0; }
@media (max-width: 700px) {
  .gallery { grid-template-columns: repeat(2, 1fr); }
}

.video-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  margin: var(--space-4) 0 var(--space-6);
}
.video-pair .figure { margin: 0; }
.video-pair .figure video {
  aspect-ratio: auto;
  width: 100%;
  height: 340px;
  object-fit: contain;
  background: var(--paper-alt);
}
@media (max-width: 700px) {
  .video-pair { grid-template-columns: 1fr; }
  .video-pair .figure video { height: 280px; }
}

.figure-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  margin: var(--space-5) 0;
}
.figure-pair .figure { margin: 0; }
@media (max-width: 700px) {
  .figure-pair { grid-template-columns: 1fr; }
}

.result-group-heading { margin-top: var(--space-6); }
.result-group-heading:first-of-type { margin-top: var(--space-5); }

.figure-detail { max-width: 480px; margin: var(--space-5) auto; }
.figure-detail img { aspect-ratio: 4 / 3; }

.stat-compare { border: 1px solid var(--line); margin: var(--space-5) 0; }
.stat-compare > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--line);
  font-size: 0.9rem;
}
.stat-compare > div:last-child { border-bottom: none; }
.stat-mono { font-family: var(--font-mono); font-weight: 500; white-space: nowrap; }

.prose ol,
.prose ul { padding-left: 1.25em; margin: var(--space-3) 0; }
.prose li { margin-bottom: var(--space-2); }

/* =========================================================
   Timeline (resume) — spec-table rows
   ========================================================= */
.timeline { border-top: 1px solid var(--line); }

.timeline-item {
  display: grid;
  grid-template-columns: 11rem 1fr;
  gap: var(--space-5);
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--line);
}

@media (max-width: 700px) {
  .timeline-item { grid-template-columns: 1fr; gap: var(--space-2); }
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  white-space: nowrap;
}

.timeline-header { display: flex; flex-direction: column; gap: var(--space-1); margin-bottom: var(--space-2); }
.timeline-header h3 { margin: 0; }
.timeline-role { color: var(--ink-soft); font-weight: 500; font-size: 0.9rem; margin: 0 0 var(--space-3); }

/* =========================================================
   Skills
   ========================================================= */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-6);
}
.skills-group h3 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  font-weight: 500;
}
.skills-group ul { list-style: none; padding: 0; margin: 0; }
.skills-group li { padding: var(--space-2) 0; border-bottom: 1px solid var(--line); font-size: 0.95rem; }
.skills-group li:last-child { border-bottom: none; }

/* =========================================================
   Contact
   ========================================================= */
.contact-list {
  list-style: none;
  padding: 0;
  margin: var(--space-6) 0 0;
  border: 1px solid var(--line);
  max-width: 480px;
}
.contact-list li {
  padding: var(--space-4) var(--space-5);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--line);
}
.contact-list li:last-child { border-bottom: none; }
.contact-list .label {
  font-family: var(--font-mono);
  color: var(--ink-soft);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.contact-list a { font-weight: 500; }

/* =========================================================
   Avatar placeholder
   ========================================================= */
.avatar-placeholder {
  width: 140px;
  height: 140px;
  border: 1px solid var(--line);
  background-color: var(--paper-alt);
  background-image: repeating-linear-gradient(135deg, var(--line) 0, var(--line) 1px, transparent 1px, transparent 10px);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-align: center;
  margin-bottom: var(--space-5);
}
.avatar-placeholder span { background: var(--paper); padding: 4px 6px; border: 1px solid var(--line); }

.avatar-photo {
  width: 140px;
  height: 140px;
  border: 1px solid var(--line);
  overflow: hidden;
  margin-bottom: var(--space-5);
}
.avatar-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
}

.about-hero {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: var(--space-7);
  align-items: start;
}
.about-hero-copy { min-width: 0; }
.avatar-photo-lg { width: 220px; height: 220px; margin-bottom: 0; }
@media (max-width: 800px) {
  .about-hero { grid-template-columns: 1fr; }
  .about-hero .avatar-photo-lg { margin: var(--space-5) auto 0; }
}

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  border-top: 1px solid var(--line);
  padding: var(--space-6) 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.footer-links { display: flex; gap: var(--space-5); }
.footer-links a { color: var(--ink-soft); text-decoration: none; }
.footer-links a:hover { color: var(--accent); }

/* =========================================================
   Scroll reveal (progressive enhancement — see js/main.js)
   Elements are fully visible by default; JS opts specific
   elements into the pre-hidden state, so nothing depends on
   JS for content to appear.
   ========================================================= */
.reveal-init { opacity: 0; transform: translateY(10px); }
.reveal-init.in-view {
  opacity: 1;
  transform: none;
  transition: opacity 400ms var(--ease-out), transform 400ms var(--ease-out);
}

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