/* ============================================================
   CYBERPUNK / GLITCH DESIGN SYSTEM
   "High-Tech, Low-Life" — every pixel rendered on a malfunctioning
   CRT in a rain-soaked alley or a rogue terminal in a bunker.
   ============================================================ */

/* ============================================================
   1. DESIGN TOKENS
   ============================================================ */
:root {
  /* Colors */
  --bg:                #0a0a0f;
  --fg:                #e0e0e0;
  --card:              #12121a;
  --muted:             #1c1c2e;
  --muted-fg:          #6b7280;
  --accent:            #00ff88;
  --accent-secondary:  #ff00ff;
  --accent-tertiary:   #00d4ff;
  --border:            #2a2a3a;
  --destructive:       #ff3366;

  /* Typography */
  --font-heading: "Orbitron", "Share Tech Mono", monospace;
  --font-body:    "JetBrains Mono", "Fira Code", "Consolas", monospace;
  --font-label:   "Share Tech Mono", monospace;

  /* Neon box-shadows */
  --box-glow:           0 0 5px #00ff88, 0 0 10px rgba(0,255,136,0.4);
  --box-glow-lg:        0 0 10px #00ff88, 0 0 25px rgba(0,255,136,0.5), 0 0 50px rgba(0,255,136,0.15);
  --box-glow-secondary: 0 0 5px #ff00ff, 0 0 20px rgba(255,0,255,0.5);
  --box-glow-tertiary:  0 0 5px #00d4ff, 0 0 20px rgba(0,212,255,0.5);

  /* drop-shadow filter versions (works after clip-path) */
  --glow:           drop-shadow(0 0 5px #00ff88) drop-shadow(0 0 12px rgba(0,255,136,0.4));
  --glow-secondary: drop-shadow(0 0 5px #ff00ff) drop-shadow(0 0 15px rgba(255,0,255,0.5));
  --glow-tertiary:  drop-shadow(0 0 5px #00d4ff) drop-shadow(0 0 15px rgba(0,212,255,0.5));

  /* Chamfer clip-paths */
  --chamfer:    polygon(0 10px, 10px 0, calc(100% - 10px) 0, 100% 10px, 100% calc(100% - 10px), calc(100% - 10px) 100%, 10px 100%, 0 calc(100% - 10px));
  --chamfer-sm: polygon(0 6px, 6px 0, calc(100% - 6px) 0, 100% 6px, 100% calc(100% - 6px), calc(100% - 6px) 100%, 6px 100%, 0 calc(100% - 6px));
  --chamfer-lg: polygon(0 18px, 18px 0, calc(100% - 18px) 0, 100% 18px, 100% calc(100% - 18px), calc(100% - 18px) 100%, 18px 100%, 0 calc(100% - 18px));

  /* Transitions — sharp & digital */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-med:  200ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   2. RESET
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }

/* ============================================================
   3. KEYFRAMES
   ============================================================ */

/* Glitch burst + chromatic aberration on hero headline */
@keyframes rgb-glitch {
  0%, 87%, 100% {
    text-shadow: -1px 0 rgba(255,0,255,0.5), 1px 0 rgba(0,212,255,0.5),
                 0 0 30px rgba(0,255,136,0.25);
    transform: none;
    filter: none;
  }
  88% {
    text-shadow: -6px 0 rgba(255,0,255,0.9), 6px 0 rgba(0,212,255,0.9);
    transform: translate(-2px, 0) scaleX(1.004);
    filter: brightness(1.2);
  }
  90% {
    text-shadow: 5px 0 rgba(255,0,255,0.8), -5px 0 rgba(0,212,255,0.8);
    transform: translate(2px, -1px) skewX(-2deg);
    filter: brightness(1.1);
  }
  92% {
    text-shadow: -2px 0 rgba(255,0,255,0.6), 2px 0 rgba(0,212,255,0.6);
    transform: translate(0, 1px);
    filter: none;
  }
  93% {
    text-shadow: -1px 0 rgba(255,0,255,0.5), 1px 0 rgba(0,212,255,0.5),
                 0 0 30px rgba(0,255,136,0.25);
    transform: none;
  }
}

/* Blinking cursor */
@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

/* Hero name reveal transition */
@keyframes hero-reveal {
  0% {
    opacity: 0;
    transform: translateY(30px) translateX(-10px);
    filter: blur(10px);
  }
  60% {
    opacity: 1;
    filter: blur(0px);
  }
  100% {
    opacity: 1;
    transform: translateY(0) translateX(0);
    filter: blur(0px);
  }
}

/* Last name reveal with glitch burst */
@keyframes hero-reveal-last {
  0% {
    opacity: 0;
    transform: translateY(30px) translateX(10px) skewX(10deg);
    filter: blur(10px);
  }
  50% {
    opacity: 1;
    filter: blur(0px);
  }
  65% {
    transform: translateY(0) translateX(-3px) skewX(-2deg);
  }
  75% {
    transform: translateY(0) translateX(2px) skewX(1deg);
  }
  100% {
    opacity: 1;
    transform: translateY(0) translateX(0) skewX(0deg);
    filter: blur(0px);
  }
}

/* Flicker (for badge & misc) */
@keyframes flicker {
  0%, 95%, 100% { opacity: 1; }
  96%            { opacity: 0.6; }
  97%            { opacity: 1; }
  98%            { opacity: 0.7; }
  99%            { opacity: 1; }
}

/* Animated neon border hue rotation */
@keyframes hue-cycle {
  0%   { filter: hue-rotate(0deg); }
  100% { filter: hue-rotate(360deg); }
}

/* Corner dot pulse */
@keyframes corner-pulse {
  0%, 100% { box-shadow: 0 0 4px var(--accent), 0 0 8px rgba(0,255,136,0.4); }
  50%       { box-shadow: 0 0 8px var(--accent), 0 0 20px rgba(0,255,136,0.7); }
}

/* Scroll reveal */
@keyframes reveal-up {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================================================
   4. BASE / BODY
   ============================================================ */
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  background-color: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  /* Circuit grid */
  background-image:
    linear-gradient(rgba(0,255,136,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,255,136,0.025) 1px, transparent 1px);
  background-size: 50px 50px;
}

/* Radial gradient depth corners */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse at top left, rgba(0,255,136,0.05) 0%, transparent 50%),
    radial-gradient(ellipse at bottom right, rgba(255,0,255,0.05) 0%, transparent 50%),
    radial-gradient(ellipse at top right, rgba(0,212,255,0.04) 0%, transparent 40%);
  pointer-events: none;
  z-index: 0;
}

/* Scanlines overlay */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.12) 2px,
    rgba(0, 0, 0, 0.12) 4px
  );
  pointer-events: none;
  z-index: 9999;
}

/* ============================================================
   5. CANVAS
   ============================================================ */
#network-bg {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
  opacity: 0.6;
}

/* ============================================================
   6. APP CONTAINER
   ============================================================ */
#app {
  min-height: 100vh;
  display: flex;
  align-items: stretch;
  justify-content: center;
  padding: 0;
  position: relative;
  z-index: 1;
}

/* ============================================================
   7. SHELL — the terminal panel
   ============================================================ */
.shell {
  width: 100%;
  max-width: 100%;
  min-height: 100vh;
  background: linear-gradient(170deg, rgba(14,14,22,0.97), rgba(10,10,15,0.99));
  border: none;
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  position: relative;
  overflow: visible;
  /* Subtle inset neon border glow */
  box-shadow:
    0 0 0 1px rgba(0,255,136,0.04),
    inset 0 0 80px rgba(0,0,0,0.4);
}

/* Top-right corner accent */
.shell::before {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 32px;
  height: 32px;
  border-top: 2px solid var(--accent);
  border-right: 2px solid var(--accent);
  z-index: 2;
  animation: corner-pulse 3s ease-in-out infinite;
}

/* Bottom-left corner accent */
.shell::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: -1px;
  width: 32px;
  height: 32px;
  border-bottom: 2px solid var(--accent);
  border-left: 2px solid var(--accent);
  z-index: 2;
  animation: corner-pulse 3s ease-in-out infinite 1.5s;
}

/* ============================================================
   8. CURSOR LIGHT
   ============================================================ */
.cursor-light {
  position: fixed;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  pointer-events: none;
  background: radial-gradient(circle, rgba(0,212,255,0.2), transparent 65%);
  mix-blend-mode: screen;
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.96);
  filter: blur(24px);
  transition: opacity 220ms ease-out, transform 240ms ease-out;
  z-index: 0;
}

.cursor-light.is-visible {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

/* ============================================================
   9. SCROLL REVEAL
   ============================================================ */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 500ms ease-out, transform 600ms cubic-bezier(0.19, 1, 0.22, 1);
  will-change: transform, opacity;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  .hero-title   { animation: rgb-glitch 9s steps(1) infinite !important; }
  .hero-title-main,
  .hero-title-last { animation: none !important; opacity: 1; transform: none; filter: none; }
  .hero-title-last { filter: drop-shadow(0 0 12px rgba(0,255,136,0.6)); }
  body::after   { display: none; }
}

/* ============================================================
   10. NAVIGATION
   ============================================================ */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px;
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(10,10,15,0.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
}

/* Left-edge accent line on nav */
.nav::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), rgba(0,255,136,0));
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--fg);
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.brand-pill {
  width: 26px;
  height: 26px;
  clip-path: var(--chamfer-sm);
  background: var(--accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  flex-shrink: 0;
  filter: drop-shadow(0 0 4px rgba(0,255,136,0.6));
}

.brand-logo {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
}

.brand-text-rotator {
  color: var(--muted-fg);
  display: inline-block;
  transition: opacity 220ms ease-out, transform 220ms ease-out;
  will-change: opacity, transform;
}

/* Prefix indicator before brand text */
.brand::before {
  content: ">";
  color: var(--accent);
  font-size: 14px;
  margin-right: -4px;
  animation: blink 1.4s step-end infinite;
}

/* Nav links container */
.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  background: rgba(18,18,26,0.9);
  border: 1px solid var(--border);
  clip-path: var(--chamfer-sm);
}

.nav-link {
  border: none;
  background: transparent;
  color: var(--muted-fg);
  padding: 6px 14px;
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--fg);
  background: rgba(0,255,136,0.05);
}

.nav-link.is-active {
  color: var(--bg);
  background: var(--accent);
  clip-path: var(--chamfer-sm);
  text-shadow: none;
  filter: drop-shadow(0 0 4px rgba(0,255,136,0.6));
}

/* Mobile burger */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 32px;
  margin-left: 12px;
  clip-path: var(--chamfer-sm);
  border: 1px solid var(--border);
  background: var(--muted);
  cursor: pointer;
  padding: 0;
  position: relative;
  transition: border-color var(--transition-fast);
}

.nav-toggle:hover { border-color: var(--accent); }

.nav-toggle span {
  position: absolute;
  left: 50%;
  width: 18px;
  height: 1.5px;
  background: var(--fg);
  transform: translateX(-50%);
  transition: transform var(--transition-fast), opacity var(--transition-fast),
              top var(--transition-fast), bottom var(--transition-fast);
}

.nav-toggle span:nth-child(1) { top: 11px; }
.nav-toggle span:nth-child(2) { top: 50%; transform: translate(-50%, -50%); }
.nav-toggle span:nth-child(3) { bottom: 10px; }

.nav.nav--open .nav-toggle span:nth-child(1) { top: 50%; transform: translate(-50%,-50%) rotate(45deg); }
.nav.nav--open .nav-toggle span:nth-child(2) { opacity: 0; }
.nav.nav--open .nav-toggle span:nth-child(3) { bottom: auto; top: 50%; transform: translate(-50%,-50%) rotate(-45deg); }

/* ============================================================
   11. PAGE & SECTIONS
   ============================================================ */
.page {
  width: 100%;
  position: relative;
}

.page-section {
  padding-top: 4px;
  padding-bottom: 20px;
  position: relative;
}

/* Accent separator line between sections */
.page-section + .page-section::before {
  content: "";
  display: block;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border) 20%, var(--border) 80%, transparent);
  margin: 0 28px;
}

/* ============================================================
   12. MAIN GRID
   ============================================================ */
.main {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 32px;
  padding: 8px 48px 24px;
  max-width: 1920px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.main--about,
.main--skills,
.main--projects,
.main--certificates,
.main--publications {
  display: block;
}

/* ============================================================
   13. HERO — INTRO BADGE
   ============================================================ */
.intro-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px 5px 8px;
  clip-path: var(--chamfer-sm);
  border: 1px solid rgba(0,255,136,0.3);
  background: rgba(0,255,136,0.06);
  margin-bottom: 18px;
  animation: flicker 12s ease-in-out infinite;
}

.intro-badge-icon {
  width: 20px;
  height: 20px;
  clip-path: var(--chamfer-sm);
  background: var(--accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-family: var(--font-label);
  font-weight: 700;
  color: var(--bg);
  flex-shrink: 0;
}

.intro-badge-text {
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
}

/* Blinking terminal cursor after rotating word */
.intro-badge-text::after {
  content: "_";
  animation: blink 1s step-end infinite;
  color: var(--accent);
}

.intro-rotator {
  transition: opacity 220ms ease-out, transform 220ms ease-out;
  will-change: opacity, transform;
}

/* ============================================================
   14. HERO — HEADLINE
   ============================================================ */
.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(40px, 5.5vw, 72px);
  font-weight: 900;
  line-height: 1.0;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0 0 14px;
  /* Chromatic aberration — always on, subtle */
  animation: rgb-glitch 9s steps(1) infinite;
}

.hero-title span {
  display: block;
}

.hero-title-main {
  color: var(--fg);
  animation: hero-reveal 1.2s cubic-bezier(0.16, 1, 0.3, 1) backwards;
  animation-delay: 0.3s;
}

.hero-title-last {
  color: var(--accent);
  filter: drop-shadow(0 0 12px rgba(0,255,136,0.6));
  animation: hero-reveal-last 1.4s cubic-bezier(0.16, 1, 0.3, 1) backwards;
  animation-delay: 0.6s;
}

/* ============================================================
   15. HERO — SUBTITLE TAGS
   ============================================================ */
.hero-subtitle-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.tag-pill {
  display: inline-flex;
  align-items: center;
  padding: 5px 12px;
  clip-path: var(--chamfer-sm);
  font-family: var(--font-label);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  border: 1px solid var(--border);
  background: var(--muted);
  color: var(--muted-fg);
}

.tag-pill.primary {
  border-color: rgba(0,255,136,0.5);
  background: rgba(0,255,136,0.08);
  color: var(--accent);
  box-shadow: inset 0 0 0 1px rgba(0,255,136,0.15);
}

.tag-pill.secondary {
  border-color: rgba(255,0,255,0.5);
  background: rgba(255,0,255,0.08);
  color: var(--accent-secondary);
  box-shadow: inset 0 0 0 1px rgba(255,0,255,0.15);
}

/* ============================================================
   16. HERO — BODY TEXT
   ============================================================ */
.hero-text {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted-fg);
  max-width: 500px;
  margin-bottom: 24px;
  /* Subtle left border terminal feel */
  padding-left: 14px;
  border-left: 2px solid rgba(0,255,136,0.25);
}

.hero-text strong {
  color: var(--accent);
  font-weight: 600;
}

/* ============================================================
   17. CTA ROW & BUTTONS
   ============================================================ */
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 22px;
}

.btn {
  clip-path: var(--chamfer-sm);
  border: none;
  padding: 10px 20px;
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: filter var(--transition-fast), background var(--transition-fast),
              color var(--transition-fast), transform var(--transition-fast);
  min-height: 44px;
}

/* Primary — outlined neon green */
.btn-primary {
  background: transparent;
  color: var(--accent);
  box-shadow: inset 0 0 0 2px var(--accent);
}

.btn-primary:hover {
  background: var(--accent);
  color: var(--bg);
  filter: drop-shadow(0 0 8px rgba(0,255,136,0.7));
  transform: translateY(-1px);
}

/* Secondary — outlined magenta */
.btn-secondary {
  background: transparent;
  color: var(--accent-secondary);
  box-shadow: inset 0 0 0 2px var(--accent-secondary);
}

.btn-secondary:hover {
  background: var(--accent-secondary);
  color: var(--bg);
  filter: drop-shadow(0 0 8px rgba(255,0,255,0.6));
  transform: translateY(-1px);
}

/* Ghost — muted outline */
.btn-ghost {
  background: transparent;
  color: var(--muted-fg);
  box-shadow: inset 0 0 0 1px var(--border);
}

.btn-ghost:hover {
  color: var(--accent-tertiary);
  box-shadow: inset 0 0 0 1px var(--accent-tertiary);
  filter: drop-shadow(0 0 6px rgba(0,212,255,0.4));
  transform: translateY(-1px);
}

.btn span.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

/* ============================================================
   18. META ROW
   ============================================================ */
.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--font-label);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted-fg);
}

.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* Animated blinking data dot */
.meta-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  box-shadow: 0 0 6px var(--accent), 0 0 12px rgba(0,255,136,0.5);
  animation: blink 2s ease-in-out infinite;
}

.meta-strong {
  color: var(--accent);
  font-weight: 700;
}

/* ============================================================
   19. PROFILE CARD
   ============================================================ */
.right-col {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 0;
}

.profile-card {
  position: relative;
  width: 100%;
  max-width: 340px;
}

/* Holographic card frame */
.profile-frame {
  position: relative;
  clip-path: var(--chamfer-lg);
  padding: 10px;
  background:
    linear-gradient(135deg, rgba(0,255,136,0.08) 0%, transparent 40%),
    linear-gradient(315deg, rgba(255,0,255,0.06) 0%, transparent 40%),
    var(--card);
  box-shadow:
    inset 0 0 0 1px rgba(0,255,136,0.2),
    0 0 30px rgba(0,0,0,0.8),
    0 0 40px rgba(0,255,136,0.08);
  transition: box-shadow var(--transition-med), transform var(--transition-med);
}

.profile-frame:hover {
  box-shadow:
    inset 0 0 0 1px rgba(0,255,136,0.4),
    0 0 30px rgba(0,0,0,0.8),
    0 0 50px rgba(0,255,136,0.15);
  transform: translateY(-2px);
}

/* Corner accent dots on profile frame */
.profile-frame::before,
.profile-frame::after {
  content: "";
  position: absolute;
  width: 8px;
  height: 8px;
  background: var(--accent);
  z-index: 3;
  animation: corner-pulse 2s ease-in-out infinite;
}

.profile-frame::before {
  top: 18px;
  left: 18px;
  clip-path: var(--chamfer-sm);
}

.profile-frame::after {
  bottom: 18px;
  right: 18px;
  clip-path: var(--chamfer-sm);
  animation-delay: 1s;
}

.profile-inner {
  clip-path: var(--chamfer);
  background: #070710;
  padding: 14px 14px 12px;
  position: relative;
  overflow: hidden;
}

.profile-image {
  width: 100%;
  aspect-ratio: 3 / 4;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  /* Slight desaturate for the noir look — override if color preferred */
  filter: contrast(1.05) brightness(0.95);
}

/* Scan overlay on profile image */
.profile-image::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 3px,
    rgba(0,255,136,0.03) 3px,
    rgba(0,255,136,0.03) 4px
  );
  pointer-events: none;
}

.profile-location {
  position: absolute;
  bottom: 10px;
  right: 14px;
  padding: 3px 8px;
  clip-path: var(--chamfer-sm);
  background: rgba(0,212,255,0.15);
  border: 1px solid rgba(0,212,255,0.4);
  color: var(--accent-tertiary);
  font-family: var(--font-label);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  filter: drop-shadow(0 0 4px rgba(0,212,255,0.4));
}

.profile-badge {
  position: absolute;
  top: 10px;
  left: 14px;
  padding: 4px 10px;
  clip-path: var(--chamfer-sm);
  background: rgba(0,255,136,0.1);
  border: 1px solid rgba(0,255,136,0.5);
  color: var(--accent);
  font-family: var(--font-label);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  animation: flicker 10s ease-in-out infinite;
}

.profile-badge span.icon { font-size: 11px; }

.profile-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 10px;
  gap: 10px;
}

.profile-caption {
  font-family: var(--font-label);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted-fg);
}

/* Terminal prompt prefix on caption */
.profile-caption::before {
  content: "> ";
  color: var(--accent);
}

.profile-socials {
  display: inline-flex;
  gap: 6px;
}

/* Social icon buttons */
.icon-btn {
  width: 32px;
  height: 32px;
  clip-path: var(--chamfer-sm);
  border: 1px solid var(--border);
  background: var(--muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--muted-fg);
  cursor: pointer;
  transition: border-color var(--transition-fast), filter var(--transition-fast),
              background var(--transition-fast), color var(--transition-fast);
  text-decoration: none;
}

.icon-btn:hover {
  border-color: var(--accent);
  background: rgba(0,255,136,0.08);
  color: var(--accent);
  filter: drop-shadow(0 0 4px rgba(0,255,136,0.5));
  transform: translateY(-1px);
}

.icon-btn .icon-img {
  width: 16px;
  height: 16px;
  display: block;
  object-fit: contain;
  /* Desaturate social icons slightly for the monochrome hacker aesthetic */
  filter: grayscale(30%) brightness(0.9);
  transition: filter var(--transition-fast);
}

.icon-btn:hover .icon-img {
  filter: grayscale(0%) brightness(1.2);
}

/* ============================================================
   20. SECTION HEADER SHARED STYLES
   ============================================================ */

/* Common badge style across all section headers */
.about-badge,
.skills-badge,
.projects-badge,
.certs-badge,
.publications-badge {
  display: inline-block;
  padding: 4px 12px;
  clip-path: var(--chamfer-sm);
  border: 1px solid rgba(0,255,136,0.4);
  background: rgba(0,255,136,0.07);
  font-family: var(--font-label);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

/* Terminal comment prefix */
.about-badge::before,
.skills-badge::before,
.projects-badge::before,
.certs-badge::before,
.publications-badge::before {
  content: "// ";
  opacity: 0.6;
}

/* Common title style */
.about-title,
.skills-title,
.projects-title,
.certs-title,
.publications-title {
  font-family: var(--font-heading);
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0 0 8px;
  color: var(--fg);
}

/* Common subtitle style */
.about-subtitle,
.skills-subtitle,
.projects-subtitle,
.certs-subtitle,
.publications-subtitle {
  margin: 0;
  font-size: 12px;
  color: var(--muted-fg);
  letter-spacing: 0.05em;
  line-height: 1.6;
}

/* ============================================================
   21. ABOUT SECTION
   ============================================================ */
.about {
  padding: 18px 4px 6px;
}

.about-header {
  margin-bottom: 20px;
}

.about-tabs {
  display: flex;
  gap: 6px;
  margin: 16px 0 14px;
}

.about-tab {
  clip-path: var(--chamfer-sm);
  border: 1px solid var(--border);
  background: var(--muted);
  color: var(--muted-fg);
  padding: 6px 16px;
  font-family: var(--font-label);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  cursor: default;
  transition: all var(--transition-fast);
}

.about-tab.is-active {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
  filter: drop-shadow(0 0 5px rgba(0,255,136,0.6));
}

.edu-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.edu-card {
  clip-path: var(--chamfer);
  padding: 16px 18px;
  background: var(--card);
  /* Terminal border via inset shadow */
  box-shadow: inset 0 0 0 1px var(--border);
  position: relative;
  transition: box-shadow var(--transition-med), filter var(--transition-med);
}

.edu-card--primary {
  box-shadow: inset 0 0 0 1px rgba(0,255,136,0.4);
  background: linear-gradient(135deg, rgba(0,255,136,0.04), var(--card));
}

.edu-card--primary:hover {
  box-shadow: inset 0 0 0 1px var(--accent);
  filter: drop-shadow(0 0 6px rgba(0,255,136,0.3));
}

.edu-top-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.edu-pill {
  padding: 3px 10px;
  clip-path: var(--chamfer-sm);
  background: rgba(0,255,136,0.1);
  border: 1px solid rgba(0,255,136,0.4);
  color: var(--accent);
  font-family: var(--font-label);
  font-size: 9px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.edu-period {
  padding: 3px 10px;
  clip-path: var(--chamfer-sm);
  background: rgba(0,212,255,0.08);
  border: 1px solid rgba(0,212,255,0.3);
  color: var(--accent-tertiary);
  font-family: var(--font-label);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.edu-program {
  margin: 0 0 5px;
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg);
}

.edu-institution {
  margin: 0 0 2px;
  font-size: 12px;
  color: var(--fg);
}

.edu-location {
  margin: 0;
  font-size: 11px;
  color: var(--muted-fg);
}

/* ============================================================
   22. SKILLS SECTION
   ============================================================ */
.skills {
  padding: 18px 4px 10px;
}

.skills-header {
  margin-bottom: 18px;
}

/* Filter toolbar */
.skills-filters {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 4px;
  margin: 16px 0 18px;
  clip-path: var(--chamfer-sm);
  background: rgba(18,18,26,0.9);
  border: 1px solid var(--border);
}

.skills-filter {
  clip-path: var(--chamfer-sm);
  border: none;
  background: transparent;
  color: var(--muted-fg);
  padding: 6px 14px;
  font-family: var(--font-label);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast), filter var(--transition-fast);
  min-height: 34px;
}

.skills-filter.is-active {
  background: var(--accent);
  color: var(--bg);
  filter: drop-shadow(0 0 4px rgba(0,255,136,0.5));
}

.skills-filter:not(.is-active):hover {
  background: rgba(0,255,136,0.06);
  color: var(--accent);
}

/* Skills grid */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

/* Responsive grid breakpoints - gradual column reduction */
@media (max-width: 1400px) {
  .skills-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (max-width: 1200px) {
  .skills-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .skills-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .skills-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 400px) {
  .skills-grid {
    grid-template-columns: repeat(1, minmax(0, 1fr));
  }
}

.skill-card {
  clip-path: var(--chamfer);
  background: var(--card);
  box-shadow: inset 0 0 0 1px var(--border);
  padding: 16px 10px 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-height: 100px;
  transition: filter var(--transition-med), box-shadow var(--transition-med),
              background var(--transition-med), transform var(--transition-med);
  cursor: default;
}

.skill-card:hover {
  background: rgba(18,18,26,0.98);
  box-shadow: inset 0 0 0 1px var(--accent), inset 0 0 20px rgba(0,255,136,0.04);
  filter: drop-shadow(0 0 8px rgba(0,255,136,0.35));
  transform: translateY(-4px);
}

/* Icon container — white bg preserves logo colors */
.skill-icon {
  width: 40px;
  height: 40px;
  clip-path: var(--chamfer-sm);
  background: rgba(255,255,255,0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-label);
  font-size: 11px;
  font-weight: 700;
  color: #111;
  padding: 5px;
  transition: filter var(--transition-fast);
}

.skill-card:hover .skill-icon {
  filter: drop-shadow(0 0 5px rgba(0,255,136,0.5));
}

.skill-icon-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.skill-name {
  font-family: var(--font-label);
  font-size: 9px;
  letter-spacing: 0.15em;
  text-align: center;
  text-transform: uppercase;
  color: var(--muted-fg);
  transition: color var(--transition-fast);
}

.skill-card:hover .skill-name {
  color: var(--accent);
}

/* ============================================================
   23. PROJECTS SECTION
   ============================================================ */
.projects {
  padding: 18px 4px 16px;
}

.projects-header {
  margin-bottom: 18px;
}

.projects-filters {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 4px;
  margin: 16px 0 18px;
  clip-path: var(--chamfer-sm);
  background: rgba(18,18,26,0.9);
  border: 1px solid var(--border);
}

.projects-filter {
  clip-path: var(--chamfer-sm);
  border: none;
  background: transparent;
  color: var(--muted-fg);
  padding: 6px 14px;
  font-family: var(--font-label);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast), filter var(--transition-fast);
  min-height: 34px;
}

.projects-filter.is-active {
  background: var(--accent);
  color: var(--bg);
  filter: drop-shadow(0 0 4px rgba(0,255,136,0.5));
}

.projects-filter:not(.is-active):hover {
  background: rgba(0,255,136,0.06);
  color: var(--accent);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

/* Project card */
.project-card {
  clip-path: var(--chamfer);
  -webkit-clip-path: var(--chamfer);
  background: var(--card);
  box-shadow: inset 0 0 0 1px var(--border);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: filter var(--transition-med), box-shadow var(--transition-med),
              transform var(--transition-med), background var(--transition-med);
  position: relative;
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
}

.project-card--featured {
  box-shadow: inset 0 0 0 1px rgba(0,255,136,0.35);
}

.project-card:hover {
  background: rgba(18,18,26,0.98);
  box-shadow: inset 0 0 0 1px var(--accent), inset 0 0 30px rgba(0,255,136,0.04);
  filter: drop-shadow(0 0 10px rgba(0,255,136,0.3));
  transform: translateY(-4px);
}

/* Featured badge */
.project-top {
  position: relative;
}

.project-featured-badge {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 3px 8px;
  clip-path: var(--chamfer-sm);
  background: var(--accent);
  color: var(--bg);
  font-family: var(--font-label);
  font-size: 9px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  z-index: 1;
  filter: drop-shadow(0 0 4px rgba(0,255,136,0.5));
}

/* Project thumbnail */
.project-thumb {
  height: 160px;
  background:
    linear-gradient(135deg, rgba(0,255,136,0.08) 0%, transparent 50%),
    linear-gradient(315deg, rgba(0,212,255,0.1) 0%, transparent 50%),
    var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

/* Scanlines overlay on thumbnail */
.project-thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.08) 2px,
    rgba(0,0,0,0.08) 4px
  );
  pointer-events: none;
}

.project-thumb--image {
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.project-thumb--image::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(0,0,0,0.5) 100%);
  z-index: 1;
}

.project-thumb-title {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  text-shadow: 0 0 20px rgba(0,255,136,0.4);
}

/* Project body */
.project-body {
  padding: 14px 16px 8px;
  flex: 1;
}

.project-name {
  margin: 0 0 5px;
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg);
}

.project-role {
  margin: 0 0 8px;
  font-family: var(--font-label);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-tertiary);
}

.project-role::before {
  content: "# ";
  opacity: 0.5;
}

.project-summary {
  margin: 0;
  font-size: 12px;
  color: var(--muted-fg);
  line-height: 1.65;
}

/* Project footer w/ tags + links */
.project-footer {
  padding: 10px 16px 14px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 8px;
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.project-tag-pill {
  padding: 2px 7px;
  clip-path: var(--chamfer-sm);
  background: rgba(28,28,46,0.9);
  border: 1px solid var(--border);
  font-family: var(--font-label);
  font-size: 8px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted-fg);
}

.project-ctas {
  display: inline-flex;
  gap: 5px;
  flex-shrink: 0;
}

.project-cta {
  padding: 5px 10px;
  clip-path: var(--chamfer-sm);
  font-family: var(--font-label);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  border: none;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: filter var(--transition-fast), transform var(--transition-fast);
  min-height: 30px;
}

.project-cta--live {
  background: rgba(0,255,136,0.12);
  color: var(--accent);
  box-shadow: inset 0 0 0 1px rgba(0,255,136,0.4);
}

.project-cta--live:hover {
  background: var(--accent);
  color: var(--bg);
  filter: drop-shadow(0 0 5px rgba(0,255,136,0.6));
  transform: translateY(-1px);
}

.project-cta--code {
  background: rgba(0,212,255,0.08);
  color: var(--accent-tertiary);
  box-shadow: inset 0 0 0 1px rgba(0,212,255,0.35);
}

.project-cta--code:hover {
  background: var(--accent-tertiary);
  color: var(--bg);
  filter: drop-shadow(0 0 5px rgba(0,212,255,0.6));
  transform: translateY(-1px);
}

/* ============================================================
   24. CERTIFICATES SECTION
   ============================================================ */
.certs {
  padding: 18px 4px 24px;
}

.certs-header {
  margin-bottom: 18px;
}

.certs-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 4px;
}

/* Cert card — terminal variant */
.cert-card {
  clip-path: var(--chamfer);
  background: var(--card);
  position: relative;
  transition: filter var(--transition-med), box-shadow var(--transition-med),
              transform var(--transition-med);
}

/* Terminal header bar */
.cert-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 28px;
  background: rgba(0,255,136,0.05);
  border-bottom: 1px solid rgba(0,255,136,0.15);
  z-index: 1;
}

/* Terminal dot decorations in header */
.cert-card::after {
  content: "● ● ●";
  position: absolute;
  top: 7px;
  left: 14px;
  font-size: 8px;
  letter-spacing: 4px;
  color: rgba(0,255,136,0.4);
  z-index: 2;
}

.cert-card:hover {
  filter: drop-shadow(0 0 10px rgba(0,255,136,0.25));
  transform: translateY(-3px);
}

.cert-inner {
  padding: 38px 16px 16px; /* top padding accommodates terminal header */
  display: flex;
  flex-direction: column;
  gap: 8px;
  box-shadow: inset 0 0 0 1px rgba(0,255,136,0.2);
  clip-path: var(--chamfer);
  height: 100%;
}

.cert-top-row {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: 10px;
}

/* Certificate thumbnail badge */
.cert-thumb {
  width: 36px;
  height: 36px;
  clip-path: var(--chamfer-sm);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  flex-shrink: 0;
  border: 1px solid rgba(0,255,136,0.2);
}

.cert-title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg);
  line-height: 1.3;
}

.cert-issuer {
  margin: 0;
  font-family: var(--font-label);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-tertiary);
}

.cert-issuer::before {
  content: "> ";
  opacity: 0.6;
}

.cert-meta-row {
  display: flex;
  justify-content: space-between;
  gap: 8px;
}

.cert-issued {
  font-family: var(--font-label);
  font-size: 9px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted-fg);
}

.cert-description {
  margin: 0;
  font-size: 11px;
  color: var(--muted-fg);
  line-height: 1.6;
  flex: 1;
}

.cert-actions {
  margin-top: 8px;
}

.cert-verify-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  clip-path: var(--chamfer-sm);
  border: none;
  background: transparent;
  box-shadow: inset 0 0 0 1px rgba(0,255,136,0.5);
  color: var(--accent);
  font-family: var(--font-label);
  font-size: 9px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast),
              filter var(--transition-fast), transform var(--transition-fast);
  min-height: 36px;
}

.cert-verify-btn::before {
  content: "$ ";
  opacity: 0.6;
}

.cert-verify-btn:hover {
  background: var(--accent);
  color: var(--bg);
  filter: drop-shadow(0 0 8px rgba(0,255,136,0.7));
  transform: translateY(-1px);
}

.certs-footer {
  margin-top: 16px;
  padding-top: 10px;
  font-family: var(--font-label);
  font-size: 9px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted-fg);
  border-top: 1px solid var(--border);
}

.certs-footer::before {
  content: "// ";
  color: var(--accent);
  opacity: 0.5;
}

/* ============================================================
   25A. PUBLICATIONS SECTION
   ============================================================ */

.publications {
  padding: 18px 4px 24px;
}

.publications-header {
  margin-bottom: 18px;
}

.publications-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 16px;
}

/* Publication card — terminal variant */
.pub-card {
  clip-path: var(--chamfer);
  background: var(--card);
  position: relative;
  transition: filter var(--transition-med), box-shadow var(--transition-med),
              transform var(--transition-med);
}

/* Terminal header bar */
.pub-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 28px;
  background: rgba(0,255,136,0.05);
  border-bottom: 1px solid rgba(0,255,136,0.15);
  z-index: 1;
}

/* Terminal dot decorations in header */
.pub-card::after {
  content: "● ● ●";
  position: absolute;
  top: 7px;
  left: 14px;
  font-size: 8px;
  letter-spacing: 4px;
  color: rgba(0,255,136,0.4);
  z-index: 2;
}

.pub-card:hover {
  filter: drop-shadow(0 0 10px rgba(0,255,136,0.25));
  transform: translateY(-3px);
}

.pub-inner {
  padding: 38px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  box-shadow: inset 0 0 0 1px rgba(0,255,136,0.2);
  clip-path: var(--chamfer);
  height: 100%;
}

.pub-title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--fg);
  line-height: 1.4;
}

.pub-conference {
  margin: 0;
  font-family: var(--font-label);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-tertiary);
}

.pub-conference::before {
  content: "> ";
  opacity: 0.6;
}

.pub-year {
  font-family: var(--font-label);
  font-size: 9px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted-fg);
}

.pub-overview {
  margin: 0;
  font-size: 11px;
  color: var(--muted-fg);
  line-height: 1.6;
  flex: 1;
}

.pub-actions {
  margin-top: 8px;
}

.pub-pdf-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  clip-path: var(--chamfer-sm);
  border: none;
  background: transparent;
  box-shadow: inset 0 0 0 1px rgba(0,255,136,0.5);
  color: var(--accent);
  font-family: var(--font-label);
  font-size: 9px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast),
              filter var(--transition-fast), transform var(--transition-fast);
  min-height: 36px;
}

.pub-pdf-btn::before {
  content: "$ ";
  opacity: 0.6;
}

.pub-pdf-btn:hover {
  background: var(--accent);
  color: var(--bg);
  filter: drop-shadow(0 0 8px rgba(0,255,136,0.7));
  transform: translateY(-1px);
}

/* ============================================================
   25. RESPONSIVE — 880px (tablet)
   ============================================================ */
@media (max-width: 880px) {
  [data-reveal="service"] {
    opacity: 0;
    transform: translateY(36px);
    transition: opacity 500ms ease-out, transform 600ms cubic-bezier(0.19, 1, 0.22, 1);
  }

  [data-reveal="service"].is-visible {
    opacity: 1;
    transform: translateY(0);
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav {
    padding: 14px 20px;
    justify-content: space-between;
    align-items: center;
  }

  /* Mobile dropdown */
  .nav-links {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    position: absolute;
    right: 20px;
    top: calc(100% + 8px);
    width: auto;
    min-width: 180px;
    padding: 8px;
    background: rgba(10,10,15,0.98);
    border: 1px solid var(--border);
    box-shadow: 0 8px 40px rgba(0,0,0,0.8), var(--box-glow);
    clip-path: none; /* Override clip-path so dropdown isn't cut off */
    z-index: 20;
  }

  .nav.nav--open .nav-links {
    display: flex;
  }

  .nav-link {
    text-align: left;
    justify-content: flex-start;
  }

  .main {
    grid-template-columns: minmax(0, 1fr);
  }

  .main--home .right-col { order: 1; }
  .main--home .left-col  { order: 2; }

  .right-col {
    justify-content: center;
    padding-top: 12px;
  }

  .profile-card {
    max-width: 280px;
    margin-top: 8px;
  }

  /* Skills filters — full-width grid on tablet */
  .skills { position: relative; }

  .skills-filters {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 4px;
    width: 100%;
    padding: 5px;
    margin: 12px 0 18px;
    clip-path: none;
    border-radius: 0;
    position: sticky;
    top: 64px;
    z-index: 3;
  }

  .skills-filter {
    width: 100%;
    text-align: center;
    justify-content: center;
  }

  /* Projects filters */
  .projects { position: relative; }

  .projects-filters {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 4px;
    width: 100%;
    padding: 5px;
    margin: 12px 0 18px;
    clip-path: none;
    border-radius: 0;
    position: sticky;
    top: 64px;
    z-index: 3;
  }

  .projects-filter {
    width: 100%;
    text-align: center;
    justify-content: center;
  }

  .projects-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .certs-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .publications-list {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ============================================================
   26. RESPONSIVE — 640px (mobile)
   ============================================================ */
@media (max-width: 640px) {
  #app {
    padding: 0;
  }

  .shell {
    border-left: none;
    border-right: none;
  }

  .main {
    padding: 8px 16px 18px;
  }

  .hero-title {
    font-size: 36px;
    letter-spacing: 0.06em;
  }

  .cta-row {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }
}

/* ============================================================
   27. SITE FOOTER
   ============================================================ */
.site-footer {
  background: var(--card);
  border-top: 1px solid var(--border);
  padding: 48px 40px 0;
  margin-top: 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 40px;
}

/* Brand column */
.footer-col--brand {}

.footer-logo {
  width: 52px;
  height: 52px;
  margin-bottom: 16px;
  display: block;
}

.footer-tagline {
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted-fg);
  margin: 0;
  max-width: 280px;
}

.footer-tagline strong {
  color: var(--fg);
}

/* Column headings */
.footer-heading {
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg);
  margin: 0 0 20px;
  padding: 6px 12px;
  border: 1px solid var(--accent);
  clip-path: var(--chamfer-sm);
  display: inline-block;
}

/* Quick links */
.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.footer-link-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--muted-fg);
  padding: 4px 0 4px 14px;
  position: relative;
  text-align: left;
  transition: color var(--transition-fast);
}

.footer-link-btn::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 5px;
  height: 5px;
  background: var(--accent);
  opacity: 0.5;
}

.footer-link-btn:hover {
  color: var(--accent);
}

.footer-link-btn:hover::before {
  opacity: 1;
}

/* Social buttons */
.footer-socials {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-social-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  background: var(--muted);
  border: 1px solid var(--border);
  clip-path: var(--chamfer-sm);
  color: var(--muted-fg);
  text-decoration: none;
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.15em;
  transition: color var(--transition-fast), border-color var(--transition-fast),
              background var(--transition-fast);
}

.footer-social-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(0,255,136,0.05);
}

.footer-social-icon {
  display: flex;
  align-items: center;
  opacity: 0.7;
}

.footer-social-btn:hover .footer-social-icon {
  opacity: 1;
}

/* Bottom bar */
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 16px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-copy {
  font-family: var(--font-label);
  font-size: 10px;
  letter-spacing: 0.15em;
  color: var(--muted-fg);
  text-transform: uppercase;
}

.footer-back-top {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: none;
  border: 1px solid var(--border);
  clip-path: var(--chamfer-sm);
  color: var(--muted-fg);
  font-family: var(--font-label);
  font-size: 10px;
  letter-spacing: 0.15em;
  cursor: pointer;
  padding: 7px 14px;
  transition: color var(--transition-fast), border-color var(--transition-fast),
              background var(--transition-fast);
}

.footer-back-top:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(0,255,136,0.05);
}

@media (max-width: 880px) {
  .site-footer {
    padding: 36px 16px 0;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-tagline {
    max-width: 100%;
  }
}

/* ============================================================
   29. FOCUS STATES (accessibility)
   ============================================================ */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  box-shadow: 0 0 0 4px rgba(0,255,136,0.15);
}