/* =============================================================
   rajan.portfolio — Design System
   Palette: Dark Navy · Violet Accent · Cyan Highlight
   Fonts:   Space Mono (display) · DM Sans (body)
   ============================================================= */

/* ── Reset & Base ──────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* Colors */
  --bg:            #08090F;
  --bg-alt:        #0D0F1A;
  --surface:       #13151F;
  --surface-2:     #1A1D2E;
  --border:        rgba(255, 255, 255, 0.07);
  --border-accent: rgba(139, 92, 246, 0.4);

  --accent:        #8B5CF6;
  --accent-dark:   #6D28D9;
  --accent-soft:   rgba(139, 92, 246, 0.1);
  --accent-glow:   rgba(139, 92, 246, 0.25);
  --cyan:          #22D3EE;
  --cyan-soft:     rgba(34, 211, 238, 0.1);
  --green:         #4ADE80;
  --orange:        #FB923C;

  --text:          #CBD5E1;
  --text-bright:   #F1F5F9;
  --text-muted:    #94A3B8;
  --text-dim:      #475569;

  /* Typography */
  --font-mono: 'Roboto', sans-serif;
  --font-sans: 'Roboto', sans-serif;

  /* Spacing */
  --sp-xs:  4px;
  --sp-sm:  8px;
  --sp-md:  16px;
  --sp-lg:  24px;
  --sp-xl:  40px;
  --sp-2xl: 64px;
  --sp-3xl: 96px;

  /* Radii */
  --r-sm:   4px;
  --r-md:   8px;
  --r-lg:   12px;
  --r-xl:   20px;
  --r-full: 9999px;

  /* Transitions */
  --ease:       cubic-bezier(0.22, 1, 0.36, 1);
  --t-fast:     180ms var(--ease);
  --t-base:     350ms var(--ease);
  --t-slow:     600ms var(--ease);
}

html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; height: auto; }
a   { text-decoration: none; color: inherit; transition: var(--t-fast); }
ul  { list-style: none; }
button { cursor: pointer; font: inherit; border: none; background: none; outline: none; }

/* ── Layout ────────────────────────────────────────────────── */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--sp-xl);
}
@media (max-width: 640px) { .container { padding: 0 var(--sp-md); } }

.section {
  padding: var(--sp-3xl) 0;
  position: relative;
}
.section-alt {
  background: var(--bg-alt);
}

/* ── Reveal Animation ──────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--t-slow), transform var(--t-slow);
}
.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ── Section Header ────────────────────────────────────────── */
.section-header {
  margin-bottom: var(--sp-2xl);
}
.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--sp-sm);
  padding: 4px 10px;
  background: var(--accent-soft);
  border-radius: var(--r-full);
  border: 1px solid var(--border-accent);
}
.section-title {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--text-bright);
  letter-spacing: -0.03em;
}

/* ── Buttons ────────────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-sm);
  background: var(--accent);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 13px 28px;
  border-radius: var(--r-sm);
  transition: var(--t-base);
  letter-spacing: 0.02em;
  border: 1px solid var(--accent);
}
.btn-primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-glow);
}
.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-sm);
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 12px 28px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
  transition: var(--t-base);
  letter-spacing: 0.02em;
}
.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
  background: var(--accent-soft);
}

/* ── NAVBAR ─────────────────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--sp-lg) 0;
  transition: var(--t-slow);
}
.navbar.nav-scrolled {
  background: rgba(8, 9, 15, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-bright);
  letter-spacing: -0.05em;
}
.nav-logo-dot { color: var(--accent); }

.nav-links {
  display: flex;
  gap: var(--sp-xl);
}
.nav-link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: var(--t-fast);
  position: relative;
}
.nav-link::after {
  content: '';
  position: absolute;
  left: 0; bottom: -4px;
  width: 0; height: 1px;
  background: var(--accent);
  transition: width var(--t-fast);
}
.nav-link:hover,
.nav-link.active { color: var(--text-bright); }
.nav-link:hover::after,
.nav-link.active::after { width: 100%; }

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--surface);
  color: var(--text-muted);
  padding: 8px 18px;
  border-radius: var(--r-sm);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  border: 1px solid var(--border);
  transition: var(--t-fast);
}
.nav-cta:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

/* ── Mobile Toggle ──────────────────────────────────────────── */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  z-index: 1001;
}
.nav-toggle span {
  width: 24px; height: 1.5px;
  background: var(--text-muted);
  transition: var(--t-base);
  transform-origin: center;
}
.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(4.5px, 4.5px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(4.5px, -4.5px); }

@media (max-width: 860px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: 0; right: -100%;
    width: 260px; height: 100vh;
    background: var(--bg-alt);
    flex-direction: column;
    padding: 90px 36px 36px;
    gap: var(--sp-xl);
    transition: right var(--t-slow);
    z-index: 1000;
    border-left: 1px solid var(--border);
  }
  .nav-links.active { right: 0; }
  .nav-cta { display: none; }
}

/* ── HERO ───────────────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(139, 92, 246, 0.12) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 80% 80%, rgba(34, 211, 238, 0.05) 0%, transparent 60%),
    var(--bg);
  padding-top: 90px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 20%, transparent 80%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 6px 16px;
  border-radius: var(--r-full);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 400;
  color: var(--text-muted);
  margin-bottom: var(--sp-xl);
  letter-spacing: 0.05em;
}
.hero-badge-dot {
  width: 7px; height: 7px;
  background: var(--green);
  border-radius: 50%;
  animation: pulse-green 2s ease-in-out infinite;
}
@keyframes pulse-green {
  0%, 100% { box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.4); }
  50%       { box-shadow: 0 0 0 6px rgba(74, 222, 128, 0); }
}

.hero-name {
  display: block;
  margin-bottom: var(--sp-xl);
  line-height: 0.88;
}
.name-line {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(4.5rem, 14vw, 11rem);
  letter-spacing: -0.04em;
}
.name-first {
  color: var(--text-bright);
}
.name-last {
  color: transparent;
  -webkit-text-stroke: 2px var(--accent);
  text-shadow: 0 0 60px var(--accent-soft);
}

.hero-role {
  font-family: var(--font-mono);
  font-size: clamp(0.9rem, 2.5vw, 1.25rem);
  color: var(--cyan);
  margin-bottom: var(--sp-xl);
  letter-spacing: 0.02em;
}
.role-prefix { color: var(--text-dim); }
.typing-cursor {
  color: var(--accent);
  animation: blink 1s step-end infinite;
}
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }

.hero-desc {
  font-size: clamp(0.95rem, 2vw, 1.1rem);
  color: var(--text-muted);
  max-width: 580px;
  margin: 0 auto var(--sp-2xl);
  font-weight: 300;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  gap: var(--sp-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--sp-2xl);
}

.hero-meta {
  display: flex;
  gap: var(--sp-xl);
  justify-content: center;
  flex-wrap: wrap;
  padding-top: var(--sp-xl);
  border-top: 1px solid var(--border);
  width: 100%;
  max-width: 560px;
}
.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  letter-spacing: 0.03em;
}
.hero-meta-link:hover { color: var(--accent); }

/* Scroll hint */
.hero-scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
}
.scroll-line {
  display: block;
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  margin: 0 auto;
  animation: scroll-drop 2s ease-in-out infinite;
}
@keyframes scroll-drop {
  0%   { opacity: 0; transform: scaleY(0); transform-origin: top; }
  50%  { opacity: 1; transform: scaleY(1); }
  100% { opacity: 0; transform: scaleY(1); transform-origin: bottom; }
}

/* ── EXPERIENCE (Timeline) ──────────────────────────────────── */
.timeline {
  position: relative;
  padding-left: 2rem;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 0; top: 12px; bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent), transparent 90%);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--sp-3xl);
}
.timeline-item:last-child { padding-bottom: 0; }

.timeline-dot {
  position: absolute;
  left: -2.4rem;
  top: 8px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--surface-2);
  border: 2px solid var(--text-dim);
  transition: var(--t-fast);
}
.timeline-dot-active {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}
.timeline-item:hover .timeline-dot {
  border-color: var(--accent);
}

.timeline-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--sp-xl);
  transition: border-color var(--t-base), box-shadow var(--t-base);
}
.timeline-card:hover {
  border-color: var(--border-accent);
  box-shadow: 0 0 0 1px var(--accent-soft), 0 8px 32px rgba(0,0,0,0.4);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--sp-md);
  margin-bottom: var(--sp-lg);
  flex-wrap: wrap;
}
.timeline-company {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 4px;
}
.timeline-role {
  font-size: 0.9rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 4px;
}
.timeline-location {
  font-size: 0.78rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 4px;
}

.timeline-period {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: var(--r-full);
  white-space: nowrap;
  flex-shrink: 0;
}
.timeline-period-active {
  color: var(--green);
  border-color: rgba(74, 222, 128, 0.25);
  background: rgba(74, 222, 128, 0.06);
}
.period-dot {
  width: 6px; height: 6px;
  background: var(--green);
  border-radius: 50%;
  animation: pulse-green 2s ease-in-out infinite;
}

.timeline-bullets {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.timeline-bullet {
  font-size: 0.88rem;
  color: var(--text-muted);
  padding-left: 1.2em;
  position: relative;
  line-height: 1.6;
}
.timeline-bullet::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.7em;
  top: 0.15em;
}

/* ── SKILLS ─────────────────────────────────────────────────── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-lg);
}

.skill-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--sp-xl);
  transition: var(--t-base);
}
.skill-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 36px rgba(0,0,0,0.4);
}

.skill-card-header {
  display: flex;
  align-items: center;
  gap: var(--sp-md);
  margin-bottom: var(--sp-lg);
  padding-bottom: var(--sp-md);
  border-bottom: 1px solid var(--border);
}
.skill-card-icon {
  width: 40px; height: 40px;
  background: var(--accent-soft);
  border: 1px solid var(--border-accent);
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 1rem;
  flex-shrink: 0;
}
.skill-card-name {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-bright);
  letter-spacing: -0.01em;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.skill-pill {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: var(--r-full);
  transition: var(--t-fast);
  letter-spacing: 0.02em;
}
.skill-pill:hover {
  color: var(--accent);
  border-color: var(--border-accent);
  background: var(--accent-soft);
}

/* ── EDUCATION ──────────────────────────────────────────────── */
.edu-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-lg);
}
.edu-card {
  display: flex;
  gap: var(--sp-lg);
  align-items: flex-start;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--sp-xl);
  transition: var(--t-base);
}
.edu-card:hover {
  border-color: var(--border-accent);
  box-shadow: 0 8px 28px rgba(0,0,0,0.35);
}
.edu-icon {
  width: 44px; height: 44px;
  background: var(--cyan-soft);
  border: 1px solid rgba(34, 211, 238, 0.2);
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan);
  font-size: 1.1rem;
  flex-shrink: 0;
}
.edu-content { flex: 1; }
.edu-school {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 6px;
}
.edu-degree {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: var(--sp-md);
  line-height: 1.5;
}
.edu-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.edu-location {
  font-size: 0.75rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 4px;
}
.edu-period {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
}

/* ── PUBLICATIONS ───────────────────────────────────────────── */
.pub-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-lg);
}
.pub-item {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: var(--sp-xl);
  align-items: start;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--sp-xl);
  transition: var(--t-base);
}
.pub-item:hover {
  border-color: var(--border-accent);
  box-shadow: 0 6px 24px rgba(0,0,0,0.3);
}
.pub-year {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
  opacity: 0.6;
  text-align: center;
  padding-top: 4px;
}
.pub-title {
  font-size: 0.95rem;
  color: var(--text-bright);
  font-style: italic;
  line-height: 1.55;
  margin-bottom: 8px;
}
.pub-authors {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-bottom: var(--sp-md);
}
.pub-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.pub-venue {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: var(--cyan);
}
.pub-details {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-dim);
}

/* ── CONTACT ────────────────────────────────────────────────── */
.contact-intro {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 480px;
  margin: var(--sp-md) auto var(--sp-2xl);
  line-height: 1.7;
}
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-md);
  max-width: 740px;
  margin: 0 auto var(--sp-2xl);
}
.contact-card {
  display: flex;
  align-items: center;
  gap: var(--sp-md);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--sp-lg);
  transition: var(--t-base);
}
.contact-card:hover {
  border-color: var(--border-accent);
  background: var(--surface-2);
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(0,0,0,0.3);
}
.contact-card-icon {
  width: 44px; height: 44px;
  background: var(--accent-soft);
  border: 1px solid var(--border-accent);
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 1rem;
  flex-shrink: 0;
}
.contact-card-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow: hidden;
}
.contact-card-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.contact-card-value {
  font-size: 0.85rem;
  color: var(--text-bright);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.contact-card-arrow {
  color: var(--text-dim);
  font-size: 0.7rem;
  transition: var(--t-fast);
}
.contact-card:hover .contact-card-arrow {
  color: var(--accent);
  transform: translate(2px, -2px);
}
.contact-resume {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-dim);
}
.contact-resume-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  margin-left: 6px;
  transition: var(--t-fast);
}
.contact-resume-link:hover {
  color: var(--text-bright);
}

/* ── PROJECTS ───────────────────────────────────────────────── */
.proj-tabs {
  display: flex;
  gap: var(--sp-sm);
  margin-bottom: var(--sp-xl);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0;
}
.proj-tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-dim);
  padding: 10px 20px;
  border-radius: var(--r-sm) var(--r-sm) 0 0;
  border: 1px solid transparent;
  border-bottom: none;
  position: relative;
  bottom: -1px;
  transition: var(--t-fast);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.proj-tab:hover {
  color: var(--text-muted);
  background: var(--surface);
}
.proj-tab-active {
  color: var(--accent);
  background: var(--surface);
  border-color: var(--border);
  border-bottom-color: var(--surface);
}
.proj-tab-active i { color: var(--accent); }

.proj-tab-panel { display: block; }
.proj-tab-panel-hidden { display: none; }

/* Software grid — 2 columns */
.proj-grid {
  display: grid;
  gap: var(--sp-lg);
}
.proj-grid-software {
  grid-template-columns: repeat(2, 1fr);
}
.proj-grid-eng {
  grid-template-columns: repeat(2, 1fr);
}

.proj-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--t-base);
}
.proj-card:hover {
  border-color: var(--border-accent);
  box-shadow: 0 8px 32px rgba(0,0,0,0.35);
  transform: translateY(-3px);
}

/* Thumbnail */
.proj-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--surface-2);
  overflow: hidden;
  position: relative;
}
.proj-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--t-slow);
}
.proj-card:hover .proj-thumb img {
  transform: scale(1.04);
}
.proj-thumb-placeholder::after {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    -45deg,
    var(--surface-2) 0px,
    var(--surface-2) 8px,
    var(--bg) 8px,
    var(--bg) 16px
  );
  opacity: 0.5;
}

/* Card body */
.proj-body {
  padding: var(--sp-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--sp-sm);
}
.proj-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--sp-sm);
  flex-wrap: wrap;
}
.proj-title {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-bright);
}
.proj-period {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-dim);
  white-space: nowrap;
}
.proj-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
}
.proj-bullets {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: var(--sp-md);
  margin-top: 4px;
}
.proj-bullet {
  font-size: 0.82rem;
  color: var(--text);
  line-height: 1.55;
  position: relative;
}
.proj-bullet::before {
  content: '▸';
  position: absolute;
  left: calc(-1 * var(--sp-md));
  color: var(--accent);
  font-size: 0.65rem;
  top: 3px;
}
.proj-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  margin-top: auto;
  padding-top: var(--sp-sm);
  transition: var(--t-fast);
}
.proj-link:hover { color: var(--text-bright); }

/* Engineering gallery */
.proj-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-sm);
  margin-top: var(--sp-sm);
}
.proj-gallery-item {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-radius: var(--r-sm);
  background: var(--surface-2);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: var(--t-fast);
}
.proj-gallery-item:hover {
  border-color: var(--border-accent);
  transform: scale(1.03);
}
.proj-gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
}

/* Lightbox */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0, 0, 0, 0.92);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: var(--sp-md);
  padding: var(--sp-xl);
}
.lightbox.lightbox-open {
  display: flex;
}
.lightbox-img {
  max-width: 90vw;
  max-height: 80vh;
  object-fit: contain;
  border-radius: var(--r-lg);
  box-shadow: 0 24px 64px rgba(0,0,0,0.6);
}
.lightbox-caption {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}
.lightbox-close {
  position: fixed;
  top: var(--sp-lg);
  right: var(--sp-xl);
  font-size: 2rem;
  color: var(--text-muted);
  line-height: 1;
  transition: var(--t-fast);
  z-index: 2001;
}
.lightbox-close:hover { color: var(--text-bright); }

/* ── FOOTER ─────────────────────────────────────────────────── */
.footer {
  padding: var(--sp-xl) 0;
  border-top: 1px solid var(--border);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--sp-md);
}
.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
}
.footer-copy strong { color: var(--text-muted); }
.footer-links {
  display: flex;
  gap: var(--sp-lg);
}
.footer-link {
  color: var(--text-dim);
  font-size: 1rem;
  transition: var(--t-fast);
}
.footer-link:hover { color: var(--accent); }

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 860px) {
  .skills-grid,
  .edu-grid {
    grid-template-columns: 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .proj-grid-software,
  .proj-grid-eng {
    grid-template-columns: 1fr;
  }
  .pub-item {
    grid-template-columns: 60px 1fr;
    gap: var(--sp-lg);
  }
}

@media (max-width: 640px) {
  .section { padding: var(--sp-2xl) 0; }

  .timeline { padding-left: 1.5rem; }
  .timeline-dot { left: -1.9rem; }
  .timeline-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .pub-item {
    grid-template-columns: 1fr;
    gap: var(--sp-sm);
  }
  .pub-year {
    font-size: 1rem;
    text-align: left;
    opacity: 0.5;
  }

  .edu-card {
    flex-direction: column;
    gap: var(--sp-md);
  }

  .hero-meta { gap: var(--sp-md); }

  .name-line { font-size: clamp(3.5rem, 18vw, 5rem); }

  .footer-inner { flex-direction: column; text-align: center; }
}

@media (max-width: 400px) {
  .hero-actions { flex-direction: column; align-items: center; }
  .btn-primary, .btn-ghost { width: 100%; justify-content: center; }
}