/* ==========================================================================
   Design tokens
   "Signal systems" — dark technical-editorial identity.
   Locked theme: near-black ground, warm paper ink, single amber signal accent.
   ========================================================================== */
:root {
  --bg: #0a0a0b;
  --bg-raised: #131316;
  --bg-raised-2: #1a1a1e;
  --line: rgba(243, 241, 234, 0.10);
  --line-strong: rgba(243, 241, 234, 0.20);

  --paper: #f3f1ea;
  --paper-dim: #9c9a95;
  --paper-faint: #66645f;

  --accent: #ff7a1a;
  --accent-2: #ffa259;
  --accent-soft: rgba(255, 122, 26, 0.12);
  --accent-soft-strong: rgba(255, 122, 26, 0.22);
  --accent-ink: #1a0e03;

  --signal-cool: #4fb8c9;

  --radius: 3px;
  --radius-lg: 4px;

  --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 24px 64px rgba(0, 0, 0, 0.55);

  --font-display: 'Space Grotesk', 'Arial Narrow', sans-serif;
  --font-sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --nav-height: 68px;
  --footer-height: 64px;
  --container-max: 1180px;
  --edge: clamp(1.25rem, 4vw, 3rem);

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-soft: cubic-bezier(0.22, 1, 0.36, 1);
  --t-fast: 160ms;
  --t-base: 320ms;
}

/* ==========================================================================
   Reset & base
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--paper);
  margin: 0;
  padding: 0;
  width: 100%;
  max-width: 100vw;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.6;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--paper);
  line-height: 1.05;
  margin: 0 0 0.5em 0;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.6rem, 5.4vw, 4.2rem); font-weight: 600; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.9rem, 3.4vw, 2.6rem); }
h3 { font-family: var(--font-sans); font-weight: 600; font-size: 1.1rem; letter-spacing: -0.005em; }

p { margin: 0 0 1em 0; color: var(--paper-dim); }

a { color: var(--accent); }

::selection { background: var(--accent); color: var(--accent-ink); }

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

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--paper-faint);
  margin: 0 0 0.9em 0;
  display: flex;
  align-items: center;
  gap: 0.6em;
}
.section-eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--accent);
  display: inline-block;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

/* ==========================================================================
   Reveal-on-scroll animation
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 640ms var(--ease-out), transform 640ms var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}
.reveal-visible { opacity: 1; transform: translateY(0); }

/* ==========================================================================
   Navigation
   ========================================================================== */
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 var(--edge);
  background: transparent;
  border-bottom: 1px solid transparent;
  box-shadow: 0 12px 24px -12px rgba(0, 0, 0, 0);
  height: var(--nav-height);
  box-sizing: border-box;
  position: fixed;
  top: 0; left: 0; right: 0;
  width: 100%;
  max-width: 100vw;
  z-index: 1000;
  transition:
    background var(--t-base) var(--ease-soft),
    border-color var(--t-base) var(--ease-soft),
    box-shadow var(--t-base) var(--ease-soft);
}

/* A soft gradient fade continues the nav's surface a little past its hard
   edge, so content passing underneath dissolves rather than clipping at a
   hairline. Plain gradient (no blur) to keep the effect cheap. */
nav::after {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 100%;
  height: 28px;
  background: linear-gradient(to bottom, rgba(10, 10, 11, 0.32), rgba(10, 10, 11, 0));
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--t-base) var(--ease-soft);
}

nav.nav-solid {
  background: rgba(10, 10, 11, 0.93);
  backdrop-filter: blur(20px) saturate(150%);
  -webkit-backdrop-filter: blur(20px) saturate(150%);
  border-bottom: 1px solid var(--line-strong);
  box-shadow: 0 12px 24px -12px rgba(0, 0, 0, 0.45);
}

nav.nav-solid::after { opacity: 1; }

.brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
  color: var(--paper);
  text-decoration: none;
}

main {
  background: var(--bg);
  color: var(--paper);
  padding-top: var(--nav-height);
}

.nav-right ul,
.nav-right .nav-menu {
  list-style: none;
  display: flex;
  gap: 2.25rem;
  margin: 0;
  padding: 0;
  align-items: center;
}

.nav-toggle { display: none; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 1001;
  position: relative;
}

.hamburger .bar {
  width: 20px;
  height: 1.5px;
  background: var(--paper);
  transition: transform var(--t-fast), opacity var(--t-fast);
}

.nav-toggle:checked + .nav-menu + .hamburger .bar:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle:checked + .nav-menu + .hamburger .bar:nth-child(2) { opacity: 0; }
.nav-toggle:checked + .nav-menu + .hamburger .bar:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

.nav-right a {
  text-decoration: none;
  color: var(--paper-dim);
  font-weight: 500;
  font-size: 0.9rem;
  font-family: var(--font-mono);
  transition: color var(--t-fast);
  position: relative;
  padding-bottom: 4px;
  letter-spacing: 0.01em;
}

.nav-right a:hover,
.nav-right a.active { color: var(--paper); }

.nav-right a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  height: 1px;
  width: 0;
  background: var(--accent);
  transition: width var(--t-base) var(--ease-soft);
}
.nav-right a:hover::after,
.nav-right a.active::after { width: 100%; }

.nav-right a.nav-contact { color: var(--accent); }

/* ==========================================================================
   Buttons & magnetic wrapper
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: 0.9em 1.6em;
  border-radius: var(--radius);
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--t-fast), color var(--t-fast), border-color var(--t-fast), transform var(--t-fast);
  white-space: nowrap;
}
.btn:active { transform: translateY(1px) scale(0.98); }

.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
}
.btn-primary:hover { background: var(--accent-2); }

.btn-outline {
  background: transparent;
  color: var(--paper);
  border-color: var(--line-strong);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

.magnetic { will-change: transform; transition: transform 220ms var(--ease-out), background var(--t-fast), color var(--t-fast), border-color var(--t-fast); }

/* ==========================================================================
   Footer
   ========================================================================== */
footer {
  background: var(--bg);
  border-top: 1px solid var(--line);
  text-align: center;
  min-height: var(--footer-height);
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--paper-faint);
  box-sizing: border-box;
}
footer p { margin: 0; }
footer a { color: var(--paper-dim); text-decoration: none; transition: color var(--t-fast); }
footer a:hover { color: var(--accent); }

/* ==========================================================================
   Hero
   ========================================================================== */
body.landing-page { background: var(--bg); }
body.landing-page main { padding-top: 0; }

.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.5;
}

.hero-scrim {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(
    100deg,
    var(--bg) 0%,
    var(--bg) 34%,
    rgba(10, 10, 11, 0.88) 48%,
    rgba(10, 10, 11, 0.35) 64%,
    transparent 82%
  );
}

.hero-grid-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 85% 70% at 50% 40%, black 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 85% 70% at 50% 40%, black 30%, transparent 78%);
  opacity: 0.5;
}

.hero-corner {
  position: absolute;
  z-index: 2;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--paper-faint);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  pointer-events: none;
}
.hero-corner span strong { color: var(--paper-dim); font-weight: 500; }
.hero-corner-tl { top: calc(var(--nav-height) + 1.75rem); left: var(--edge); }
.hero-corner-tr { top: calc(var(--nav-height) + 1.75rem); right: var(--edge); text-align: right; align-items: flex-end; }

.hero-inner {
  position: relative;
  z-index: 2;
  max-width: var(--container-max);
  width: 100%;
  margin: 0 auto;
  padding: calc(var(--nav-height) + 4.75rem) var(--edge) 4rem;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent);
  margin: 0 0 1.1em 0;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.hero-title {
  font-size: clamp(3rem, 8.4vw, 6.6rem);
  margin: 0 0 0.08em 0;
  line-height: 0.98;
}
.hero-title-line { display: block; }
.hero-title-accent { color: var(--accent); font-style: italic; }

.hero-role {
  font-family: var(--font-mono);
  font-size: clamp(0.95rem, 1.6vw, 1.15rem);
  font-weight: 500;
  color: var(--paper-dim);
  margin: 0.9em 0 1.6em 0;
  letter-spacing: 0.01em;
}
.hero-role-sep { color: var(--paper-faint); margin: 0 0.6em; }

.hero-desc {
  font-size: 1.08rem;
  color: var(--paper-dim);
  max-width: 40em;
  margin-bottom: 2.2em;
  line-height: 1.7;
}

.hero-actions { display: flex; gap: 0.9em; margin-bottom: 2.6em; flex-wrap: wrap; }

.social-links { display: flex; gap: 0.75rem; align-items: center; }

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius);
  border: 1px solid var(--line-strong);
  color: var(--paper-dim);
  transition: border-color var(--t-fast), color var(--t-fast), transform var(--t-fast);
}
.social-link:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.social-link svg { width: 17px; height: 17px; }

/* Positioned near the top of the hero (not the bottom) so the nav goes solid
   after a small, fixed amount of scrolling, independent of hero height. A
   bottom-anchored sentinel kept the nav transparent for the entire hero
   scroll, which broke on any viewport where hero content (stacked mobile
   buttons, wrapped heading) is taller than the viewport: the oversized name
   would scroll most of the way up, passing directly under a still-transparent
   nav, before the sentinel ever left view. */
#hero-sentinel { position: absolute; top: 40px; left: 0; width: 1px; height: 1px; }

/* ==========================================================================
   Shared: sidebar + content two-column layout (About page)
   ========================================================================== */
.about-main {
  display: flex;
  align-items: flex-start;
  min-height: calc(100vh - var(--nav-height) - 60px);
  max-width: var(--container-max);
  margin: 0 auto;
}

.about-sidebar {
  position: sticky;
  top: calc(var(--nav-height) + 3rem);
  flex: 0 0 200px;
  margin-left: var(--edge);
  margin-top: 4rem;
}

.sidebar-content h3 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--paper-faint);
  margin-bottom: 1.1rem;
}

.sidebar-nav { list-style: none; padding: 0; margin: 0; }
.sidebar-nav li { margin-bottom: 0.2rem; }
.sidebar-nav a {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  color: var(--paper-dim);
  text-decoration: none;
  padding: 0.4rem 0;
  font-size: 0.88rem;
  border-left: 1px solid transparent;
  padding-left: 0.8rem;
  transition: color var(--t-fast), border-color var(--t-fast);
}
.sidebar-index { font-family: var(--font-mono); font-size: 0.72rem; color: var(--paper-faint); }
.sidebar-nav a:hover { color: var(--paper); border-color: var(--accent); }

.about-content {
  flex: 1;
  min-width: 0;
  max-width: 760px;
  margin: 0 auto;
  padding: 4rem var(--edge) 6rem;
}

.about-section { margin-bottom: 6rem; scroll-margin-top: calc(var(--nav-height) + 24px); }
.about-section:first-child { margin-top: 0.5rem; }
.about-section:last-child { margin-bottom: 2rem; }

.about-section h1 { margin-bottom: 1.6rem; }
.about-section h2 { margin-bottom: 2rem; }

/* ==========================================================================
   Intro
   ========================================================================== */
.intro-row { display: flex; align-items: flex-start; gap: 2.5rem; }

.profile-image { flex: 0 0 auto; }
.profile-image img {
  width: 116px;
  height: 116px;
  object-fit: cover;
  border-radius: 50%;
  filter: grayscale(1);
  border: 1px solid var(--line-strong);
  transition: filter var(--t-base) var(--ease-soft);
}
.profile-image:hover img { filter: grayscale(0); }

.intro-text-content { flex: 1; }
.intro-text { font-size: 1.04rem; line-height: 1.75; }
.intro-text:last-child { margin-bottom: 0; }

/* ==========================================================================
   Timeline (Experience)
   ========================================================================== */
.timeline { display: flex; flex-direction: column; }

.timeline-item {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 2rem;
  padding: 2.25rem 0;
  border-top: 1px solid var(--line);
  position: relative;
}
.timeline-item:first-child { border-top: none; padding-top: 0; }

.timeline-marker { display: flex; align-items: baseline; gap: 0.6rem; }
.timeline-year {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--paper-faint);
  transition: color var(--t-base) var(--ease-soft);
}
.timeline-item:hover .timeline-year { color: var(--accent); }
.timeline-node { display: none; }

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.timeline-header > div:first-child { flex: 1 1 300px; min-width: 0; }
.timeline-header .duration { flex: 0 0 auto; }

.timeline-header h3 { margin-bottom: 0.2em; }

.company { font-weight: 500; color: var(--paper-dim); margin: 0; font-size: 0.95rem; }
.company a { color: var(--accent); }
.location { color: var(--paper-faint); }

.duration {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--paper-faint);
  white-space: nowrap;
  margin: 0;
}

.description { font-size: 0.98rem; }

.key-achievements { margin: 0.75rem 0; padding-left: 1.1rem; }
.key-achievements li { color: var(--paper-dim); margin-bottom: 0.5rem; line-height: 1.65; font-size: 0.96rem; }
.key-achievements li:last-child { margin-bottom: 0; }

.technologies { margin-top: 1.2rem; display: flex; flex-wrap: wrap; gap: 0.5rem; }

.tech-tag {
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--paper-dim);
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius);
  font-size: 0.74rem;
  font-weight: 500;
  font-family: var(--font-mono);
}

/* ==========================================================================
   Education
   ========================================================================== */
.education-item { padding-bottom: 2.25rem; margin-bottom: 2.25rem; border-bottom: 1px solid var(--line); }
.education-item:last-child { padding-bottom: 0; margin-bottom: 0; border-bottom: none; }
.education-item-secondary .institution { margin-bottom: 0; }

.institution { color: var(--paper-dim); font-weight: 500; margin: 0; font-size: 0.95rem; }

.academic-stat { font-size: 0.95rem; margin: 0.75rem 0 1.5rem; }
.academic-stat strong { color: var(--accent); font-family: var(--font-mono); }

.honors h4, .subsection-title {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--paper-faint);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1.1rem;
}

.honors-groups { display: flex; flex-direction: column; gap: 1.1rem; }
.honors-group { display: flex; gap: 1.2rem; align-items: baseline; }
.honors-year {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--paper-faint);
  flex: 0 0 2.6rem;
}

.tag-cloud, .skills-list { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.skill-item {
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--paper-dim);
  padding: 0.38rem 0.8rem;
  border-radius: var(--radius);
  font-size: 0.82rem;
  font-weight: 500;
  transition: border-color var(--t-fast), color var(--t-fast);
}
.skill-item:hover { border-color: var(--accent); color: var(--accent); }

/* ==========================================================================
   Publications & Achievements
   ========================================================================== */
.publications-list { list-style: none; padding: 0; margin: 0 0 2.5rem; }
.publications-list li {
  padding: 1.1rem 0;
  border-top: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.publications-list li:first-child { border-top: none; padding-top: 0; }
.publications-list li:last-child { padding-bottom: 0; }

.pub-title { font-size: 0.98rem; color: var(--paper); font-weight: 500; }
.pub-venue { font-family: var(--font-mono); font-size: 0.78rem; color: var(--accent); }

.achievements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2.5rem;
}

.achievement-item { border-left: 1px solid var(--line-strong); padding-left: 1.25rem; }
.achievement-item h3 { font-size: 1.05rem; margin-bottom: 0.4em; }
.achievement-item p:last-child { margin-bottom: 0; font-size: 0.92rem; }

.achievement-date {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--accent);
  margin-bottom: 0.5em;
}

/* ==========================================================================
   Skills
   ========================================================================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2.5rem;
}

.skill-category h3 {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--paper-faint);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
}

.languages-row { margin-top: 2.5rem; padding-top: 2.5rem; border-top: 1px solid var(--line); }
.languages-row h3 {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--paper-faint);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
}

/* ==========================================================================
   Certifications
   ========================================================================== */
.certifications-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
}

.certification-item {
  padding: 1.4rem 1.5rem 1.4rem 0;
  border-bottom: 1px solid var(--line);
  transition: opacity var(--t-fast);
}
.certification-item:hover { opacity: 0.8; }
.certification-item h3 { font-size: 0.98rem; margin-bottom: 0.35em; line-height: 1.35; }
.certification-item .issuer { font-family: var(--font-mono); font-size: 0.78rem; color: var(--paper-faint); margin-bottom: 0.9rem; }

.verification-link {
  display: inline-block;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
}
.verification-link:hover { text-decoration: underline; }

/* ==========================================================================
   Gallery
   ========================================================================== */
.image-gallery {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
}

.gallery-item {
  overflow: hidden;
  aspect-ratio: 1 / 1;
  background: var(--bg);
}
.gallery-item img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: grayscale(1);
  transition: transform var(--t-base) var(--ease-soft), filter var(--t-base) var(--ease-soft);
}
.gallery-item:hover img { transform: scale(1.05); filter: grayscale(0); }

/* ==========================================================================
   Projects page
   ========================================================================== */
.projects-main { display: flex; justify-content: center; }

.projects-content {
  width: 100%;
  max-width: var(--container-max);
  padding: 5rem var(--edge) 6rem;
}

.projects-header { max-width: 640px; margin-bottom: 4rem; }
.projects-intro { font-size: 1.06rem; line-height: 1.7; }

.projects-layout {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 4rem;
  align-items: start;
}

.projects-list { display: flex; flex-direction: column; }

.project-row {
  position: relative;
  display: grid;
  grid-template-columns: 46px 1fr 28px;
  align-items: baseline;
  gap: 1.25rem;
  padding: 1.9rem 0;
  border-top: 1px solid var(--line);
  cursor: pointer;
  transition: opacity var(--t-fast);
}
.project-row:first-child { border-top: none; padding-top: 0; }
.projects-list:hover .project-row:not(:hover) { opacity: 0.5; }

.project-index {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--paper-faint);
  transition: color var(--t-fast);
}
.project-row:hover .project-index,
.project-row.is-active .project-index { color: var(--accent); }

.project-name {
  font-size: clamp(1.3rem, 2vw, 1.7rem);
  margin: 0;
  transition: color var(--t-fast);
}
.project-row:hover .project-name,
.project-row.is-active .project-name { color: var(--accent-2); }

.project-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.7rem; }
.project-row .tech-tag { font-size: 0.7rem; padding: 0.24rem 0.55rem; }

.project-row-desc {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

.project-arrow {
  font-size: 1.1rem;
  color: var(--paper-faint);
  opacity: 0;
  transform: translate(-4px, 4px);
  transition: opacity var(--t-fast), transform var(--t-fast), color var(--t-fast);
  justify-self: end;
  align-self: center;
}
.project-row:hover .project-arrow,
.project-row.is-active .project-arrow {
  opacity: 1;
  transform: translate(0, 0);
  color: var(--accent);
}

.projects-preview {
  position: sticky;
  top: calc(var(--nav-height) + 2.5rem);
  border: 1px solid var(--line);
  padding: 1.75rem;
  background: var(--bg-raised);
}

.preview-visual {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--bg);
  border: 1px solid var(--line);
  margin-bottom: 1.6rem;
}
.preview-canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.preview-image {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  filter: grayscale(0.3);
}

.preview-index {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--paper-faint);
  margin-bottom: 0.8em;
}
.preview-name { font-size: 1.3rem; margin-bottom: 0.5em; }
.preview-desc { font-size: 0.92rem; line-height: 1.65; margin-bottom: 0; }
.preview-tags { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-top: 1.2rem; }
.preview-link {
  display: inline-block;
  margin-top: 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
}
.preview-link:hover { text-decoration: underline; }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1100px) {
  .about-sidebar { display: none; }
  .about-content { max-width: 640px; margin: 0; padding: 3rem var(--edge) 4rem; }
  .about-main { display: block; }

  .projects-layout { grid-template-columns: 1fr; gap: 3rem; }
  .projects-preview { position: static; order: -1; }
}

@media (max-width: 900px) {
  .hero-corner-tr { display: none; }
  .timeline-item { grid-template-columns: 1fr; gap: 0.6rem; }
  .timeline-marker { gap: 0.5rem; }
}

@media (max-width: 768px) {
  html, body { max-width: 100vw; overflow-x: hidden; }

  nav { padding: 0 1.25rem; }

  .nav-right .nav-menu {
    position: fixed;
    inset: 0;
    top: 0;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: var(--bg);
    width: 100%;
    height: 100dvh;
    text-align: center;
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--t-base) var(--ease-soft), opacity var(--t-base) var(--ease-soft);
    gap: 0;
  }

  .nav-toggle:checked + .nav-menu {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-right .nav-menu li { padding: 1rem 0; width: 100%; }
  .nav-right .nav-menu a { font-family: var(--font-display); font-size: 1.6rem; }
  .nav-right a::after { display: none; }

  .hamburger { display: flex; }

  .hero-inner { padding: 5.5rem 1.25rem 3rem; }
  .hero-corner { display: none; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { text-align: center; justify-content: center; }

  .about-content { padding: 2.5rem 1.25rem 3.5rem; }
  .about-section { margin-bottom: 4rem; }
  .intro-row { flex-direction: column; }

  .publications-list li,
  .achievements-grid,
  .skills-grid,
  .certifications-list { }
  .achievements-grid, .skills-grid { grid-template-columns: 1fr; }
  .certifications-list { grid-template-columns: 1fr; }
  .certification-item { padding-right: 0; }

  .image-gallery { grid-template-columns: repeat(2, 1fr); }

  .projects-content { padding: 3rem 1.25rem 4rem; }
  .project-row { grid-template-columns: 34px 1fr; }
  .project-arrow { display: none; }
  .projects-preview { padding: 1.25rem; }
}

@media (max-width: 480px) {
  .hero-title { font-size: clamp(2.6rem, 13vw, 3.4rem); }
  .profile-image img { width: 88px; height: 88px; }
  .honors-group { flex-direction: column; gap: 0.4rem; }
}