/* ============================================
   Tokens
   ============================================ */
:root {
  --bg: #0a0f1a;
  --bg-raised: #121826;
  --ink: #e9edf4;
  --ink-dim: #9aa3b5;
  --ink-faint: #5a6376;
  --accent: #4d9fff;
  --accent-dim: #2f5f9e;
  --line: #1e2738;
  --line-soft: #161d2a;

  --font-display: "Space Grotesk", sans-serif;
  --font-body: "IBM Plex Sans", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  --maxw: 1080px;
  --gutter: clamp(1.25rem, 6vw, 6rem);
  --nav-bg: rgba(10, 15, 26, 0.85);
}

/* Light theme overrides */
[data-theme="light"] {
  --bg: #f6f8fb;
  --bg-raised: #ffffff;
  --ink: #121826;
  --ink-dim: #4a5468;
  --ink-faint: #8a93a6;
  --accent: #1f6fd6;
  --accent-dim: #7fb0ec;
  --line: #dfe4ec;
  --line-soft: #eaeef4;
  --nav-bg: rgba(246, 248, 251, 0.85);
}

* { box-sizing: border-box; }

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background 0.25s ease, color 0.25s ease;
}

a {
  color: inherit;
  text-decoration: none;
}

.accent { color: var(--accent); }
.nowrap { white-space: nowrap; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #031428;
  padding: 0.5rem 1rem;
  z-index: 200;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

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

/* ============================================
   Nav (top)
   ============================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.1rem var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink-dim);
}

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

.nav-cta {
  border: 1px solid var(--line);
  padding: 0.45rem 0.95rem;
  border-radius: 999px;
  color: var(--ink) !important;
}
.nav-cta:hover {
  border-color: var(--accent);
  color: var(--accent) !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.4rem;
}
.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--ink);
  display: block;
}

/* Theme toggle button */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-left: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: none;
  color: var(--ink-dim);
  cursor: pointer;
  flex-shrink: 0;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.theme-toggle svg { display: block; }
/* Show the moon in dark mode (tap to go light), sun in light mode */
.theme-toggle .icon-sun { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-sun { display: block; }

/* ============================================
   Hero
   ============================================ */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(3rem, 8vw, 7rem) var(--gutter) clamp(2rem, 6vw, 4rem);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

.eyebrow {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 1rem;
}

.hero-text h1 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5.2vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 1.4rem;
  text-wrap: balance;
}

.hero-lede {
  color: var(--ink-dim);
  font-size: 1.05rem;
  max-width: 38ch;
  margin: 0 0 2.2rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 0.75rem 1.4rem;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.btn-primary {
  background: var(--accent);
  color: #031428;
}
@media (hover: hover) {
  .btn-primary:hover { transform: translateY(-2px); }
}

.btn-ghost {
  border: 1px solid var(--line);
  color: var(--ink);
}
.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.hero-art { width: 100%; }
.hero-canvas {
  display: block;
  width: 100%;
  height: 380px;
  max-height: 60vh;
}

/* ============================================
   Sections (shared)
   ============================================ */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(3rem, 7vw, 5.5rem) var(--gutter);
  border-top: 1px solid var(--line-soft);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  letter-spacing: -0.01em;
  margin: 0 0 2.2rem;
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}

.section-title .idx {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-dim);
  font-weight: 400;
}

.section-lede {
  color: var(--ink-dim);
  margin: -1.4rem 0 2rem;
}

/* ============================================
   Projects
   ============================================ */
.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.project-card {
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.6rem;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
@media (hover: hover) {
  .project-card:hover {
    border-color: var(--accent-dim);
    transform: translateY(-3px);
  }
}

.project-card .idx {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.85rem;
  margin: 0 0 0.6rem;
}

.project-card h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin: 0 0 0.6rem;
}

.project-title-link {
  color: var(--ink);
  transition: color 0.15s ease;
}
.project-title-link:hover {
  color: var(--accent);
}

.project-card p {
  color: var(--ink-dim);
  font-size: 0.95rem;
  margin: 0 0 1.1rem;
}

.tag-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0;
  margin: 0 0 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-dim);
}
.tag-list li {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
}

.card-links {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  flex-wrap: wrap;
}

.card-link {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--accent);
}
.card-link:hover { text-decoration: underline; }

.card-link-primary {
  font-weight: 500;
}

/* ============================================
   Skills
   ============================================ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem 2rem;
}

.skill-label {
  font-family: var(--font-mono);
  color: var(--ink-faint);
  font-size: 0.82rem;
  margin: 0 0 0.8rem;
}

.skill-group .tag-list { margin: 0; }

/* ============================================
   Resume
   ============================================ */
.timeline {
  margin-top: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.timeline-item {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  grid-template-areas:
    "date title"
    "date body";
  gap: 0.3rem 1.5rem;
  padding-bottom: 1.6rem;
  border-bottom: 1px solid var(--line-soft);
}

.timeline-item > p,
.timeline-item > h3,
.timeline-item > ul {
  min-width: 0;
}

.timeline-date { grid-area: date; }
.timeline-item h3 { grid-area: title; }
.timeline-item ul { grid-area: body; }

.timeline-date {
  font-family: var(--font-mono);
  color: var(--accent-dim);
  font-size: 0.85rem;
  margin: 0;
}

.timeline-item h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin: 0 0 0.7rem;
}

.timeline-item ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--ink-dim);
}
.timeline-item li { margin-bottom: 0.4rem; }

.edu {
  margin-top: 2.5rem;
}
.edu-grid {
  margin-top: 2.5rem;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem 3rem;
}
.edu-grid .edu { margin-top: 0; }
@media (max-width: 600px) {
  .edu-grid { grid-template-columns: 1fr; gap: 2rem; }
}
.edu h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin: 0 0 0.8rem;
}
.edu ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--ink-dim);
}
.edu li { margin-bottom: 0.4rem; }

/* ============================================
   Writing
   ============================================ */
.log-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.log-list li {
  display: flex;
  gap: 1.2rem;
  align-items: baseline;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--line-soft);
}
.log-date {
  font-family: var(--font-mono);
  color: var(--ink-faint);
  font-size: 0.85rem;
  flex-shrink: 0;
}
.log-list a:hover { color: var(--accent); }

/* ============================================
   Footer
   ============================================ */
.footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(3rem, 7vw, 5.5rem) var(--gutter) max(3rem, env(safe-area-inset-bottom));
  border-top: 1px solid var(--line-soft);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-text h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin: 0 0 0.7rem;
}

.footer-text p {
  color: var(--ink-dim);
  margin: 0 0 1rem;
}

.footer-email {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 1.05rem;
}
.footer-email:hover { text-decoration: underline; }

.footer-links {
  display: flex;
  gap: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--ink-dim);
}
.footer-links a:hover { color: var(--ink); }

.visitor-count {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-faint);
  margin-top: 2.5rem;
}

/* ============================================
   Side rail nav (dash markers)
   ============================================ */
.side-rail {
  position: fixed;
  right: clamp(1rem, 3vw, 2.5rem);
  top: 50%;
  transform: translateY(-50%);
  z-index: 90;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 1.1rem;
}

.side-rail-item {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.3rem 0;
}

.side-rail-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--ink-dim);
  opacity: 0;
  transform: translateX(6px);
  transition: opacity 0.2s ease, transform 0.2s ease, color 0.2s ease;
  white-space: nowrap;
}

.side-rail-dash {
  width: 18px;
  height: 2px;
  background: var(--ink-faint);
  border-radius: 1px;
  transition: width 0.25s ease, background 0.25s ease, box-shadow 0.25s ease;
}

.side-rail-item:hover .side-rail-label,
.side-rail-item:focus-visible .side-rail-label {
  opacity: 1;
  transform: translateX(0);
}

.side-rail-item:hover .side-rail-dash,
.side-rail-item:focus-visible .side-rail-dash {
  background: var(--ink);
}

.side-rail-item.is-active .side-rail-dash {
  width: 34px;
  background: var(--accent);
  box-shadow: 0 0 10px rgba(124, 242, 156, 0.45);
}

.side-rail-item.is-active .side-rail-label {
  color: var(--accent);
}

@media (max-width: 900px) {
  .side-rail { display: none; }
}

/* ============================================
   Reveal-on-scroll
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ============================================
   Mobile nav
   ============================================ */
@media (max-width: 760px) {
  .nav-toggle { display: flex; order: 3; }
  .theme-toggle { order: 2; margin-left: auto; margin-right: 0.25rem; }

  .nav-inner {
    padding-left: max(var(--gutter), env(safe-area-inset-left));
    padding-right: max(var(--gutter), env(safe-area-inset-right));
  }

  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-raised);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 0.5rem var(--gutter) 1rem;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
  }
  .nav-menu.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-menu a {
    padding: 0.95rem 0;
    width: 100%;
    border-bottom: 1px solid var(--line-soft);
    font-size: 0.95rem;
  }
  .nav-cta {
    margin-top: 0.6rem;
    text-align: center;
    width: 100%;
  }

  .hero {
    position: relative;
    overflow: hidden;
  }
  .hero-inner {
    grid-template-columns: 1fr;
  }
  /* On phones, place the particle network as a full-bleed background
     layer behind the hero text instead of a separate block below it. */
  .hero-text {
    position: relative;
    z-index: 2;
  }
  .hero-art {
    display: block;
    position: absolute;
    inset: 0;
    width: 100%;
    margin: 0;
    max-width: none;
    z-index: 1;
    opacity: 0.5;
    pointer-events: none;
  }
  .hero-canvas {
    width: 100%;
    height: 100%;
    max-height: none;
  }

  .hero-actions { width: 100%; }
  .hero-actions .btn {
    flex: 1 1 auto;
    justify-content: center;
    min-height: 48px;
  }

  .project-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr 1fr; }
  .timeline-item {
    grid-template-columns: 1fr;
    grid-template-areas:
      "date"
      "title"
      "body";
    gap: 0.4rem;
  }

  .footer-inner {
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .skills-grid { grid-template-columns: 1fr; }

  .hero-text h1 { font-size: clamp(2rem, 9vw, 2.6rem); }

  .log-list li {
    flex-direction: column;
    gap: 0.25rem;
    align-items: flex-start;
  }

  .footer-inner { gap: 1.5rem; }
}

/* ============================================
   Project detail page
   ============================================ */
.project-hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 4rem) var(--gutter) clamp(2rem, 5vw, 3rem);
}

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink-faint);
  margin: 0 0 1.8rem;
}
.breadcrumb a { color: var(--ink-dim); }
.breadcrumb a:hover { color: var(--accent); }

.project-hero .idx {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.85rem;
  display: block;
  margin: 0 0 0.8rem;
}

.project-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.5vw, 3rem);
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
  line-height: 1.1;
}

.project-hero .summary {
  color: var(--ink-dim);
  font-size: 1.08rem;
  max-width: 60ch;
  margin: 0 0 1.8rem;
}

.project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 0 0 1.8rem;
}
.project-meta li {
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-dim);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.3rem 0.8rem;
}

.project-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.project-body {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter) clamp(3rem, 6vw, 5rem);
  display: grid;
  gap: clamp(2.5rem, 5vw, 3.5rem);
}

.project-section h2 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin: 0 0 1rem;
  letter-spacing: -0.01em;
}

.project-section p {
  color: var(--ink-dim);
  margin: 0 0 1rem;
  max-width: 72ch;
}

.project-section ul {
  color: var(--ink-dim);
  padding-left: 1.2rem;
  margin: 0 0 1rem;
  max-width: 72ch;
}
.project-section li { margin-bottom: 0.5rem; }

.shot-frame {
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: clamp(1rem, 3vw, 1.8rem);
}
.shot-frame img {
  width: 100%;
  display: block;
  border-radius: 8px;
}
.shot-caption {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-faint);
  margin: 0.9rem 0 0;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}
.result-stat {
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.4rem;
}
.result-stat .num {
  font-family: var(--font-display);
  font-size: 1.9rem;
  color: var(--accent);
  display: block;
  margin: 0 0 0.4rem;
}
.result-stat .label {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink-dim);
}

.project-nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 3rem) var(--gutter) clamp(3rem, 6vw, 5rem);
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  border-top: 1px solid var(--line-soft);
  flex-wrap: wrap;
}

.project-nav-link {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink-dim);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  max-width: 45%;
}
.project-nav-link:hover { color: var(--accent); }
.project-nav-link .dir {
  color: var(--ink-faint);
  font-size: 0.75rem;
}
.project-nav-link.next { text-align: right; align-items: flex-end; }

@media (max-width: 760px) {
  .results-grid { grid-template-columns: 1fr 1fr; }
  .project-nav {
    flex-direction: column;
  }
  .project-nav-link { max-width: 100%; }
  .project-nav-link.next {
    text-align: left;
    align-items: flex-start;
  }
  .project-actions { width: 100%; }
  .project-actions .btn {
    flex: 1 1 auto;
    justify-content: center;
    min-height: 48px;
  }
}

@media (max-width: 480px) {
  .results-grid { grid-template-columns: 1fr; }
}