:root {
  --ink: #0e0e0e;
  --ink-secondary: #4a4a4a;
  --ink-muted: #888;
  --surface: #f9f7f4;
  --surface-alt: #f0ede8;
  --surface-card: #ffffff;
  --accent: #1a3a5c;
  --accent-warm: #b5451b;
  --accent-gold: #c9922a;
  --border: rgba(0,0,0,0.10);
  --border-strong: rgba(0,0,0,0.18);
  --nav-h: 64px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Syne', sans-serif;
  background: var(--surface);
  color: var(--ink);
  min-height: 100vh;
}

/* ── NAV ── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h);
  background: rgba(249,247,244,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center;
  padding: 0 2.5rem;
  gap: 2.5rem;
}

.nav-logo {
  font-family: 'DM Serif Display', serif;
  font-size: 1.15rem;
  color: var(--accent);
  text-decoration: none;
  margin-right: auto;
  letter-spacing: 0.01em;
}

.nav-tabs {
  display: flex; gap: 0;
  list-style: none;
}

.nav-tabs a {
  text-decoration: none;
  font-family: 'Syne', sans-serif;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-secondary);
  padding: 0.5rem 1.1rem;
  border-radius: 6px;
  transition: color 0.2s, background 0.2s;
  display: inline-block;
}

.nav-tabs a.active {
  color: var(--accent);
  background: rgba(26,58,92,0.08);
}

.nav-tabs a:hover:not(.active) {
  color: var(--ink);
  background: var(--surface-alt);
}

.nav-cta {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--surface-card);
  background: var(--accent);
  border: none; border-radius: 6px;
  padding: 0.5rem 1.1rem;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s;
}
.nav-cta:hover { background: #0f2440; }

/* ── PAGES ── */
.page { padding-top: var(--nav-h); min-height: 100vh; }

/* ── HERO ── */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: calc(100vh - var(--nav-h));
}

.hero-left {
  padding: 6rem 3rem 4rem 3.5rem;
  display: flex; flex-direction: column; justify-content: center;
  border-right: 1px solid var(--border);
}

.hero-eyebrow {
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-warm);
  margin-bottom: 1.5rem;
}

.hero-name {
  font-family: 'DM Serif Display', serif;
  font-size: clamp(3rem, 5vw, 5rem);
  line-height: 1.05;
  color: var(--accent);
  margin-bottom: 1.2rem;
}

.hero-name em {
  font-style: italic;
  color: var(--accent-warm);
}

.hero-tagline {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--ink-secondary);
  max-width: 480px;
  margin-bottom: 2.5rem;
}

.hero-badges {
  display: flex; flex-wrap: wrap; gap: 0.6rem;
  margin-bottom: 2.5rem;
}

.badge {
  font-family: 'DM Mono', monospace;
  font-size: 0.7rem;
  padding: 0.3rem 0.75rem;
  border-radius: 4px;
  letter-spacing: 0.06em;
  border: 1px solid var(--border-strong);
  color: var(--ink-secondary);
  background: var(--surface-card);
}

.badge.highlight {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

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

.btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-family: 'Syne', sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.65rem 1.3rem;
  border-radius: 6px;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: #0f2440; }

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}
.btn-outline:hover { background: var(--accent); color: #fff; }

.hero-right {
  background: var(--accent);
  display: flex; flex-direction: column;
  padding: 5rem 3rem 4rem;
  position: relative; overflow: hidden;
}

.hero-right::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    radial-gradient(circle at 20% 80%, rgba(181,69,27,0.25) 0%, transparent 55%),
    radial-gradient(circle at 80% 20%, rgba(201,146,42,0.18) 0%, transparent 55%);
}

.hero-stat-grid {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: auto;
}

.hero-stat {
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 10px;
  padding: 1.5rem;
  background: rgba(255,255,255,0.06);
}

.hero-stat-num {
  font-family: 'DM Serif Display', serif;
  font-size: 2.4rem;
  color: #fff;
  line-height: 1;
  margin-bottom: 0.4rem;
}

.hero-stat-label {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.65);
  letter-spacing: 0.05em;
  line-height: 1.4;
}

.hero-right-headline {
  position: relative; z-index: 1;
  font-family: 'DM Serif Display', serif;
  font-size: 1.5rem;
  color: rgba(255,255,255,0.9);
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.hero-right-sub {
  position: relative; z-index: 1;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
  line-height: 1.7;
  margin-bottom: 2.5rem;
  max-width: 380px;
}

/* ── SECTION WRAPPER ── */
.section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 5rem 2.5rem;
}

.section-header {
  display: flex;
  align-items: baseline;
  gap: 1.2rem;
  margin-bottom: 3rem;
}

.section-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-warm);
}

.section-title {
  font-family: 'DM Serif Display', serif;
  font-size: 2.2rem;
  color: var(--accent);
  line-height: 1.15;
}

.divider {
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ── PROJECT CARDS ── */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--surface-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  transition: box-shadow 0.25s, transform 0.25s;
  display: flex; flex-direction: column;
  cursor: default;
}
.project-card:hover {
  box-shadow: 0 8px 32px rgba(0,0,0,0.08);
  transform: translateY(-2px);
}

.card-type {
  font-family: 'DM Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-warm);
  margin-bottom: 0.9rem;
}

.card-title {
  font-family: 'DM Serif Display', serif;
  font-size: 1.25rem;
  color: var(--accent);
  line-height: 1.3;
  margin-bottom: 0.9rem;
}

.card-body {
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--ink-secondary);
  flex: 1;
  margin-bottom: 1.25rem;
}

.card-tags {
  display: flex; flex-wrap: wrap; gap: 0.4rem;
  margin-top: auto;
}

.tag {
  font-family: 'DM Mono', monospace;
  font-size: 0.66rem;
  padding: 0.22rem 0.6rem;
  border-radius: 4px;
  letter-spacing: 0.05em;
  background: rgba(26,58,92,0.07);
  color: var(--accent);
  border: 1px solid rgba(26,58,92,0.12);
}

.tag.warm {
  background: rgba(181,69,27,0.07);
  color: var(--accent-warm);
  border-color: rgba(181,69,27,0.15);
}

.card-link {
  display: inline-flex; align-items: center; gap: 0.35rem;
  margin-top: 1rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  text-decoration: none;
  transition: gap 0.2s;
}
.card-link:hover { gap: 0.55rem; }

/* ── FEATURED CARD (full-width) ── */
.project-card.featured {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  background: linear-gradient(135deg, #f0ede8 0%, #fff 100%);
  border: 1.5px solid rgba(26,58,92,0.18);
}

.featured-left { display: flex; flex-direction: column; }
.featured-right {
  display: flex; flex-direction: column; justify-content: center;
  background: var(--accent);
  border-radius: 8px;
  padding: 2rem;
  position: relative; overflow: hidden;
}

.featured-right::before {
  content: '';
  position: absolute; inset: 0;
  background-image: radial-gradient(circle at 80% 20%, rgba(201,146,42,0.25) 0%, transparent 60%);
}

.featured-right p {
  position: relative; z-index: 1;
  color: rgba(255,255,255,0.75);
  font-size: 0.85rem;
  line-height: 1.75;
  font-style: italic;
  font-family: 'DM Serif Display', serif;
  font-size: 1rem;
}

/* ── D2K TIMELINE ── */
.timeline { display: flex; flex-direction: column; gap: 0; }

.timeline-item {
  display: grid;
  grid-template-columns: 120px 1px 1fr;
  gap: 0 2rem;
  position: relative;
}

.timeline-item:not(:last-child) .timeline-line {
  background: var(--border-strong);
}

.timeline-date {
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  color: var(--accent-gold);
  letter-spacing: 0.08em;
  text-align: right;
  padding-top: 0.25rem;
}

.timeline-line {
  width: 1px;
  background: var(--border);
  position: relative;
}

.timeline-dot {
  position: absolute;
  top: 6px; left: 50%; transform: translateX(-50%);
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--surface);
  box-shadow: 0 0 0 1px var(--accent);
}

.timeline-content {
  padding: 0 0 2.5rem;
}

.timeline-title {
  font-family: 'DM Serif Display', serif;
  font-size: 1.1rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.timeline-desc {
  font-size: 0.86rem;
  color: var(--ink-secondary);
  line-height: 1.75;
  margin-bottom: 0.8rem;
}

.timeline-award {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-family: 'DM Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  padding: 0.25rem 0.7rem;
  border-radius: 4px;
  background: rgba(201,146,42,0.1);
  color: #8a6010;
  border: 1px solid rgba(201,146,42,0.3);
  margin-bottom: 0.6rem;
}

/* ── SKILLS GRID ── */
.skills-section {
  background: var(--accent);
  padding: 4rem 0;
  margin-top: 0;
}

.skills-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2.5rem;
}

.skills-inner .section-title { color: #fff; }
.skills-inner .section-label { color: rgba(255,255,255,0.5); }
.skills-inner .divider { background: rgba(255,255,255,0.2); }

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-top: 2.5rem;
}

.skill-card {
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 10px;
  padding: 1.5rem;
}

.skill-card-title {
  font-family: 'DM Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  margin-bottom: 1rem;
}

.skill-list {
  list-style: none;
  display: flex; flex-direction: column; gap: 0.45rem;
}

.skill-list li {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.85);
  display: flex; align-items: center; gap: 0.5rem;
}

.skill-list li::before {
  content: '';
  display: inline-block;
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--accent-gold);
  flex-shrink: 0;
}

/* ── ABOUT PAGE ── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 4rem;
  align-items: start;
}

.about-sidebar {
  position: sticky; top: calc(var(--nav-h) + 2rem);
}

.about-avatar {
  width: 100%;
  aspect-ratio: 1/1;
  border-radius: 12px;
  background: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-family: 'DM Serif Display', serif;
  font-size: 5rem;
  color: rgba(255,255,255,0.3);
  margin-bottom: 1.5rem;
  position: relative; overflow: hidden;
}

.about-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: relative;
  z-index: 2;
}

.about-avatar::after {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(circle at 70% 30%, rgba(201,146,42,0.3) 0%, transparent 60%);
}

.about-initials {
  position: relative; z-index: 1;
  color: rgba(255,255,255,0.7);
}

.about-info { display: flex; flex-direction: column; gap: 0.5rem; }

.about-info-row {
  display: flex; justify-content: space-between; align-items: baseline;
  border-bottom: 1px solid var(--border);
  padding: 0.5rem 0;
  font-size: 0.82rem;
}

.about-info-label { color: var(--ink-muted); font-family: 'DM Mono', monospace; font-size: 0.7rem; }
.about-info-val { color: var(--ink); font-weight: 500; text-align: right; }

.about-main { display: flex; flex-direction: column; gap: 2.5rem; }

.about-block-title {
  font-family: 'DM Serif Display', serif;
  font-size: 1.4rem;
  color: var(--accent);
  margin-bottom: 1rem;
}

.about-prose {
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--ink-secondary);
}

.exp-item {
  border-left: 2px solid var(--border-strong);
  padding-left: 1.25rem;
  margin-bottom: 1.5rem;
}

.exp-title { font-weight: 600; font-size: 0.92rem; color: var(--ink); }
.exp-org { font-size: 0.82rem; color: var(--accent); margin-bottom: 0.25rem; }
.exp-date { font-family: 'DM Mono', monospace; font-size: 0.7rem; color: var(--ink-muted); margin-bottom: 0.5rem; }
.exp-desc { font-size: 0.83rem; color: var(--ink-secondary); line-height: 1.7; }

/* ── MENTOR PAGE ── */
.mentor-hero {
  background: var(--accent);
  padding: 5rem 0 4rem;
  position: relative; overflow: hidden;
}

.mentor-hero::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    radial-gradient(circle at 15% 85%, rgba(181,69,27,0.3) 0%, transparent 50%),
    radial-gradient(circle at 85% 15%, rgba(201,146,42,0.2) 0%, transparent 50%);
}

.mentor-hero-inner {
  position: relative; z-index: 1;
  max-width: 1100px; margin: 0 auto; padding: 0 2.5rem;
}

.mentor-hero h1 {
  font-family: 'DM Serif Display', serif;
  font-size: 3rem;
  color: #fff;
  margin-bottom: 0.75rem;
}

.mentor-hero p {
  font-size: 1rem;
  color: rgba(255,255,255,0.7);
  max-width: 600px;
  line-height: 1.75;
  margin-bottom: 2rem;
}

.mentor-stats {
  display: flex; gap: 3rem; flex-wrap: wrap;
}

.mentor-stat { }
.mentor-stat-num {
  font-family: 'DM Serif Display', serif;
  font-size: 2.5rem; color: #fff;
  line-height: 1;
}
.mentor-stat-label {
  font-size: 0.78rem; color: rgba(255,255,255,0.55);
  letter-spacing: 0.05em;
}

/* ── FOOTER ── */
footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem;
  text-align: center;
  font-family: 'DM Mono', monospace;
  font-size: 0.7rem;
  color: var(--ink-muted);
  letter-spacing: 0.08em;
}

/* ── RESEARCH PAGE ── */
.research-intro {
  background: var(--surface-alt);
  border-bottom: 1px solid var(--border);
  padding: 4rem 0 3.5rem;
}

.research-intro-inner {
  max-width: 1100px; margin: 0 auto; padding: 0 2.5rem;
}

.research-intro h1 {
  font-family: 'DM Serif Display', serif;
  font-size: 2.8rem; color: var(--accent);
  margin-bottom: 1rem;
}

.research-intro p {
  font-size: 0.95rem; color: var(--ink-secondary);
  max-width: 680px; line-height: 1.8;
}

.research-card {
  background: var(--surface-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 2.5rem;
  margin-bottom: 2rem;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 2.5rem;
  align-items: start;
  transition: box-shadow 0.25s, transform 0.25s;
}

.research-card:hover {
  box-shadow: 0 8px 36px rgba(0,0,0,0.07);
  transform: translateY(-2px);
}

.research-card.sandia {
  border-color: rgba(181,69,27,0.25);
  background: linear-gradient(135deg, #fdf8f5 0%, #fff 100%);
}

.research-card-left {}

.research-num {
  font-family: 'DM Serif Display', serif;
  font-size: 5rem;
  line-height: 1;
  color: rgba(26,58,92,0.08);
  margin-bottom: 0.5rem;
}

.research-card.sandia .research-num { color: rgba(181,69,27,0.1); }

.research-area {
  font-family: 'DM Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-warm);
  margin-bottom: 0.4rem;
}

.research-card-left h2 {
  font-family: 'DM Serif Display', serif;
  font-size: 1.3rem;
  color: var(--accent);
  line-height: 1.35;
}

.research-card-right {}

.research-card-right h3 {
  font-family: 'DM Serif Display', serif;
  font-size: 1.55rem;
  color: var(--ink);
  line-height: 1.3;
  margin-bottom: 1rem;
}

.research-card-right p {
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--ink-secondary);
  margin-bottom: 1rem;
}

.research-highlight {
  background: rgba(26,58,92,0.05);
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  padding: 1rem 1.25rem;
  font-size: 0.84rem;
  color: var(--ink-secondary);
  line-height: 1.7;
  font-style: italic;
  margin-top: 1.25rem;
}

.research-card.sandia .research-highlight {
  background: rgba(181,69,27,0.05);
  border-color: var(--accent-warm);
}

.sandia-badge {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: rgba(181,69,27,0.08);
  border: 1px solid rgba(181,69,27,0.2);
  color: var(--accent-warm);
  font-family: 'DM Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  padding: 0.3rem 0.75rem;
  border-radius: 4px;
  margin-top: 1rem;
}

@media (max-width: 768px) {
  /* ── NAV ── */
  nav {
    padding: 0 0.75rem;
    gap: 0.5rem;
  }
  .nav-logo {
    font-size: 1rem;
    flex: 0 0 auto;
  }
  .nav-tabs {
    gap: 0.2rem;
  }
  .nav-tabs a {
    padding: 0.35rem 0.45rem;
    font-size: 0.6rem;
  }
  .nav-cta {
    display: none;
  }

  /* ── HERO ── */
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }
  .hero-left {
    padding: 3rem 1.5rem 2rem;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  .hero-name {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 0.8rem;
  }
  .hero-eyebrow {
    font-size: 0.65rem;
    margin-bottom: 1rem;
  }
  .hero-tagline {
    font-size: 0.9rem;
    line-height: 1.6;
    max-width: none;
    margin-bottom: 1.5rem;
  }
  .hero-badges {
    gap: 0.4rem;
    margin-bottom: 1.5rem;
  }
  .badge {
    font-size: 0.6rem;
    padding: 0.25rem 0.5rem;
  }
  .hero-links {
    gap: 0.5rem;
    flex-direction: column;
  }
  .btn {
    padding: 0.55rem 1rem;
    font-size: 0.75rem;
    width: 100%;
    justify-content: center;
  }
  .hero-right {
    display: none;
  }

  /* ── SECTION ── */
  .section {
    padding: 3rem 1.5rem;
    max-width: 100%;
  }
  .section-header {
    flex-direction: column;
    gap: 0.8rem;
    margin-bottom: 2rem;
  }
  .section-label {
    font-size: 0.65rem;
  }
  .section-title {
    font-size: 1.6rem;
  }
  .divider {
    display: none;
  }

  /* ── PROJECT CARDS ── */
  .project-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .project-card {
    padding: 1.5rem;
  }
  .card-title {
    font-size: 1.1rem;
  }
  .card-body {
    font-size: 0.8rem;
  }
  .card-type {
    font-size: 0.6rem;
  }

  /* ── FEATURED CARD ── */
  .project-card.featured {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .featured-right {
    display: none;
  }

  /* ── SKILLS SECTION ── */
  .skills-section {
    padding: 2.5rem 0;
  }
  .skills-inner {
    padding: 0 1.5rem;
  }
  .skills-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
    margin-top: 2rem;
  }
  .skill-card {
    padding: 1.2rem;
  }
  .skill-card-title {
    font-size: 0.65rem;
    margin-bottom: 0.75rem;
  }
  .skill-list li {
    font-size: 0.8rem;
  }

  /* ── ABOUT PAGE ── */
  .about-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .about-sidebar {
    position: static;
  }
  .about-avatar {
    aspect-ratio: auto;
    height: 250px;
  }

  /* ── RESEARCH CARD ── */
  .research-card {
    grid-template-columns: 1fr;
    padding: 1.5rem;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
  }
  .research-num {
    font-size: 3rem;
  }
  .research-card-right h3 {
    font-size: 1.2rem;
  }
  .research-intro {
    padding: 2.5rem 0 2rem;
  }
  .research-intro-inner {
    padding: 0 1.5rem;
  }
  .research-intro h1 {
    font-size: 1.8rem;
  }
  .research-intro p {
    font-size: 0.88rem;
  }

  /* ── MENTOR PAGE ── */
  .mentor-hero {
    padding: 3rem 0 2rem;
  }
  .mentor-hero-inner {
    padding: 0 1.5rem;
  }
  .mentor-hero h1 {
    font-size: 2rem;
  }
  .mentor-hero p {
    font-size: 0.9rem;
  }
  .mentor-stats {
    gap: 1.5rem;
    flex-direction: column;
  }
  .mentor-stat-num {
    font-size: 1.8rem;
  }

  /* ── TIMELINE ── */
  .timeline-item {
    grid-template-columns: 80px 1px 1fr;
    gap: 0 1rem;
  }
  .timeline-date {
    font-size: 0.65rem;
  }
  .timeline-title {
    font-size: 1rem;
  }
  .timeline-desc {
    font-size: 0.8rem;
  }

  /* ── FOOTER ── */
  footer {
    padding: 1.5rem;
    font-size: 0.65rem;
  }
}

@media (max-width: 480px) {
  /* ── NAV ── */
  nav {
    padding: 0.5rem 0.75rem;
    gap: 0.5rem;
  }
  .nav-logo {
    font-size: 0.95rem;
    flex: 0 0 auto;
  }
  .nav-tabs {
    gap: 0.15rem;
  }
  .nav-tabs a {
    padding: 0.3rem 0.35rem;
    font-size: 0.55rem;
  }
  .nav-cta {
    display: none;
  }

  /* ── HERO ── */
  .hero-left {
    padding: 2rem 1rem 1.5rem;
  }
  .hero-name {
    font-size: clamp(1.5rem, 3.5vw, 2.5rem);
    margin-bottom: 0.6rem;
  }
  .hero-eyebrow {
    font-size: 0.6rem;
    margin-bottom: 0.8rem;
  }
  .hero-tagline {
    font-size: 0.85rem;
    line-height: 1.5;
    margin-bottom: 1rem;
  }
  .hero-badges {
    gap: 0.3rem;
    margin-bottom: 1rem;
  }
  .badge {
    font-size: 0.55rem;
    padding: 0.2rem 0.4rem;
  }
  .btn {
    padding: 0.5rem 0.8rem;
    font-size: 0.7rem;
    min-height: 40px;
  }

  /* ── SECTION ── */
  .section {
    padding: 2rem 1rem;
  }
  .section-title {
    font-size: 1.4rem;
  }
  .section-label {
    font-size: 0.6rem;
  }

  /* ── PROJECT CARD ── */
  .project-card {
    padding: 1.2rem;
  }
  .card-title {
    font-size: 1rem;
  }
  .card-body {
    font-size: 0.75rem;
    line-height: 1.6;
  }
  .card-type {
    font-size: 0.55rem;
    margin-bottom: 0.6rem;
  }
  .card-link {
    font-size: 0.7rem;
  }

  /* ── SKILLS SECTION ── */
  .skills-section {
    padding: 2rem 0;
  }
  .skills-inner {
    padding: 0 1rem;
  }
  .skills-grid {
    grid-template-columns: 1fr;
  }
  .skill-card {
    padding: 1rem;
  }
  .skill-card-title {
    font-size: 0.6rem;
    margin-bottom: 0.6rem;
  }
  .skill-list li {
    font-size: 0.75rem;
    gap: 0.35rem;
  }

  /* ── RESEARCH ── */
  .research-card {
    padding: 1.2rem;
  }
  .research-num {
    font-size: 2.5rem;
    margin-bottom: 0.3rem;
  }
  .research-card-right h3 {
    font-size: 1.05rem;
    margin-bottom: 0.75rem;
  }
  .research-area {
    font-size: 0.55rem;
  }
  .research-intro h1 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
  }
  .research-intro p {
    font-size: 0.8rem;
  }

  /* ── ABOUT ── */
  .about-avatar {
    height: 200px;
    font-size: 3.5rem;
  }
  .about-info-row {
    padding: 0.35rem 0;
    font-size: 0.75rem;
  }
  .about-block-title {
    font-size: 1.2rem;
  }
  .about-prose {
    font-size: 0.85rem;
  }

  /* ── MENTOR PAGE ── */
  .mentor-hero h1 {
    font-size: 1.5rem;
  }
  .mentor-hero p {
    font-size: 0.85rem;
    line-height: 1.6;
  }
  .mentor-stat-num {
    font-size: 1.5rem;
  }
  .mentor-stat-label {
    font-size: 0.7rem;
  }

  /* ── FOOTER ── */
  footer {
    padding: 1rem;
    font-size: 0.6rem;
  }
}