/* ═══════════════════════════════════════════════════════
   BioTech Noir — Portfolio Stylesheet
   Aesthetic: Fluorescence microscopy meets dark lab UI
   ═══════════════════════════════════════════════════════ */

/* --- Design Tokens --- */
:root {
  --bg-deep: #06060c;
  --bg-primary: #0a0a12;
  --bg-elevated: #10101c;
  --bg-card: #12122000;
  --bg-card-solid: #131320;

  --cyan: #00e5ff;
  --cyan-dim: #00e5ff60;
  --cyan-glow: #00e5ff20;
  --green: #39ff14;
  --green-dim: #39ff1460;
  --magenta: #ff006e;
  --magenta-dim: #ff006e60;
  --amber: #ffb300;
  --amber-dim: #ffb30060;
  --teal: #00d4aa;
  --teal-dim: #00d4aa60;
  --violet: #a855f7;
  --violet-dim: #a855f760;

  --text-primary: #e6e6ef;
  --text-secondary: #8888a0;
  --text-muted: #55556a;

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

  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);

  --container-max: 1200px;
  --gutter: clamp(1.5rem, 4vw, 3rem);
}

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

html {
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: var(--cyan-dim) var(--bg-deep);
}

body {
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection {
  background: var(--cyan);
  color: var(--bg-deep);
}

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

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

/* --- Film Grain Overlay --- */
.grain {
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 128px 128px;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem var(--gutter);
  transition:
    background 0.4s,
    backdrop-filter 0.4s;
}

.nav.scrolled {
  background: #06060cdd;
  backdrop-filter: blur(20px) saturate(1.2);
  border-bottom: 1px solid #ffffff08;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.5rem;
}

.nav-logo-helix {
  color: var(--cyan);
  font-size: 1.2rem;
  animation: spin-slow 8s linear infinite;
}

@keyframes spin-slow {
  to {
    transform: rotate(360deg);
  }
}

.nav-logo-text {
  letter-spacing: -0.02em;
}

.accent {
  color: var(--cyan);
}

.nav-links {
  display: flex;
  gap: 2.5rem;
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-secondary);
  transition: color 0.3s;
  position: relative;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--cyan);
  transition: width 0.3s var(--ease-out-expo);
}

.nav-link:hover {
  color: var(--text-primary);
}
.nav-link:hover::after {
  width: 100%;
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 0 var(--gutter);
  overflow: hidden;
}

#dna-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 780px;
  padding-top: 4rem;
}

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
  opacity: 0;
  animation: fadeSlideUp 0.8s var(--ease-out-expo) 0.3s forwards;
}

.hero-eyebrow-line {
  width: 48px;
  height: 1px;
  background: var(--cyan);
}

.hero-eyebrow-text {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--cyan);
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 1.75rem;
}

.hero-title-line {
  display: block;
  font-size: clamp(3rem, 8vw, 6rem);
  opacity: 0;
  transform: translateY(40px);
  animation: fadeSlideUp 0.9s var(--ease-out-expo) forwards;
}

.hero-title-line[data-delay="0"] {
  animation-delay: 0.5s;
}
.hero-title-line[data-delay="1"] {
  animation-delay: 0.65s;
}
.hero-title-line[data-delay="2"] {
  animation-delay: 0.8s;
}

.hero-title-accent {
  background: linear-gradient(
    135deg,
    var(--cyan) 0%,
    var(--green) 50%,
    var(--cyan) 100%
  );
  background-size: 200% 100%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation:
    fadeSlideUp 0.9s var(--ease-out-expo) 0.8s forwards,
    gradientShift 4s ease-in-out infinite 1.5s;
}

@keyframes gradientShift {
  0%,
  100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

.cursor {
  -webkit-text-fill-color: var(--cyan);
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.7;
  opacity: 0;
  animation: fadeSlideUp 0.8s var(--ease-out-expo) 1s forwards;
}

.hero-stats {
  display: flex;
  gap: 3rem;
  margin: 2.5rem 0;
  opacity: 0;
  animation: fadeSlideUp 0.8s var(--ease-out-expo) 1.15s forwards;
}

.hero-stat {
  display: flex;
  flex-direction: column;
}

.hero-stat-value {
  font-family: var(--font-display);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--cyan);
  line-height: 1.1;
}

.hero-stat-lt {
  font-size: 2rem;
}

.hero-stat-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
  opacity: 0;
  animation: fadeSlideUp 0.8s var(--ease-out-expo) 1.3s forwards;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 1.75rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: none;
  cursor: pointer;
  transition: all 0.35s var(--ease-out-expo);
}

.btn-primary {
  background: var(--cyan);
  color: var(--bg-deep);
  clip-path: polygon(
    0 0,
    calc(100% - 12px) 0,
    100% 12px,
    100% 100%,
    12px 100%,
    0 calc(100% - 12px)
  );
}

.btn-primary:hover {
  background: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--cyan-dim);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid #ffffff15;
}

.btn-ghost:hover {
  color: var(--text-primary);
  border-color: var(--cyan-dim);
  background: var(--cyan-glow);
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 2.5rem;
  right: var(--gutter);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  opacity: 0;
  animation: fadeIn 1s 2s forwards;
}

.hero-scroll-indicator span {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--text-muted);
  writing-mode: vertical-rl;
}

.hero-scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--cyan), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%,
  100% {
    opacity: 0.3;
    transform: scaleY(0.5);
    transform-origin: top;
  }
  50% {
    opacity: 1;
    transform: scaleY(1);
  }
}

/* --- Section Styles --- */
.section {
  padding: clamp(5rem, 10vh, 8rem) 0;
  position: relative;
}

.section-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section-header {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 4rem;
}

.section-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--cyan);
  letter-spacing: 0.1em;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.section-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, #ffffff15, transparent);
}

/* --- About Section --- */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about-lead {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.about-lead em {
  font-style: normal;
  color: var(--cyan);
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

.about-details {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.about-detail-card {
  padding: 1.5rem;
  border: 1px solid #ffffff08;
  border-radius: 2px;
  background: var(--bg-elevated);
  display: grid;
  grid-template-columns: 44px 1fr;
  grid-template-rows: auto auto;
  column-gap: 1rem;
  row-gap: 0.25rem;
  transition:
    border-color 0.3s,
    transform 0.3s;
}

.about-detail-card:hover {
  border-color: var(--cyan-dim);
  transform: translateX(4px);
}

.about-detail-icon {
  grid-row: 1 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan);
}

.about-detail-card h3 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
}

.about-detail-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* --- Expertise Section --- */
.expertise {
  background: var(--bg-primary);
}

.expertise-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.expertise-card {
  position: relative;
  padding: 2.5rem;
  border: 1px solid #ffffff08;
  background: var(--bg-deep);
  overflow: hidden;
  transition:
    border-color 0.4s,
    transform 0.4s var(--ease-out-expo);
}

.expertise-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  opacity: 0;
  transition: opacity 0.4s;
}

.expertise-card[data-category="de1"]::before {
  background: var(--cyan);
}
.expertise-card[data-category="de2"]::before {
  background: var(--green);
}
.expertise-card[data-category="de3"]::before {
  background: var(--magenta);
}
.expertise-card[data-category="de4"]::before {
  background: var(--amber);
}

.expertise-card:hover {
  border-color: #ffffff15;
  transform: translateY(-4px);
}

.expertise-card:hover::before {
  opacity: 1;
}

.expertise-card-glow {
  position: absolute;
  top: -80px;
  right: -80px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  opacity: 0;
  filter: blur(60px);
  transition: opacity 0.5s;
  pointer-events: none;
}

.expertise-card[data-category="de1"] .expertise-card-glow {
  background: var(--cyan-glow);
}
.expertise-card[data-category="de2"] .expertise-card-glow {
  background: #39ff1415;
}
.expertise-card[data-category="de3"] .expertise-card-glow {
  background: #ff006e15;
}
.expertise-card[data-category="de4"] .expertise-card-glow {
  background: #ffb30015;
}

.expertise-card:hover .expertise-card-glow {
  opacity: 1;
}

.expertise-card-number {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.expertise-card[data-category="de1"] .expertise-card-number {
  color: var(--cyan);
}
.expertise-card[data-category="de2"] .expertise-card-number {
  color: var(--green);
}
.expertise-card[data-category="de3"] .expertise-card-number {
  color: var(--magenta);
}
.expertise-card[data-category="de4"] .expertise-card-number {
  color: var(--amber);
}

.expertise-card-title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}

.expertise-card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.5rem;
}

.expertise-card-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 0.3rem 0.65rem;
  border-radius: 1px;
  letter-spacing: 0.04em;
}

.expertise-card[data-category="de1"] .skill-tag {
  background: #00e5ff10;
  color: var(--cyan);
  border: 1px solid #00e5ff20;
}
.expertise-card[data-category="de2"] .skill-tag {
  background: #39ff1410;
  color: var(--green);
  border: 1px solid #39ff1420;
}
.expertise-card[data-category="de3"] .skill-tag {
  background: #ff006e10;
  color: var(--magenta);
  border: 1px solid #ff006e20;
}
.expertise-card[data-category="de4"] .skill-tag {
  background: #ffb30010;
  color: var(--amber);
  border: 1px solid #ffb30020;
}

/* --- Projects Section --- */
.project-filters {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.filter-btn {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.6rem 1.25rem;
  background: transparent;
  border: 1px solid #ffffff10;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.3s var(--ease-out-expo);
}

.filter-btn:hover {
  border-color: #ffffff25;
  color: var(--text-primary);
}

.filter-btn.active {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--bg-deep);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 1.5rem;
}

.project-card {
  opacity: 1;
  transform: translateY(0);
  transition:
    opacity 0.5s var(--ease-out-expo),
    transform 0.5s var(--ease-out-expo);
}

.project-card[data-visible="false"] {
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  position: absolute;
  visibility: hidden;
}

.project-card-inner {
  position: relative;
  padding: 2rem;
  height: 100%;
  border: 1px solid #ffffff08;
  background: var(--bg-card-solid);
  display: flex;
  flex-direction: column;
  transition:
    border-color 0.4s,
    transform 0.4s var(--ease-out-expo),
    box-shadow 0.4s;
  overflow: hidden;
}

.project-card-inner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 0%, #ffffff05, transparent 70%);
  opacity: 0;
  transition: opacity 0.4s;
  /* Decorative only — must not intercept clicks on the card/link beneath it. */
  pointer-events: none;
}

.project-card-inner:hover {
  border-color: #ffffff18;
  transform: translateY(-6px);
  box-shadow: 0 20px 60px -20px #00000080;
}

.project-card-inner:hover::before {
  opacity: 1;
}

.project-card-badge {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.25rem 0.6rem;
  border: 1px solid #ffffff15;
  color: var(--text-muted);
}

.fun-badge {
  border-color: var(--teal-dim);
  color: var(--teal);
}

.project-card-icon {
  margin-bottom: 1.25rem;
  opacity: 0.8;
}

.project-card-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 0.25rem;
}

.project-card-subtitle {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  margin-bottom: 1rem;
}

.project-card-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
  margin-bottom: 1.25rem;
}

.project-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  padding: 0.2rem 0.55rem;
  background: #ffffff06;
  border: 1px solid #ffffff0a;
  color: var(--text-muted);
  letter-spacing: 0.03em;
  transition:
    color 0.3s,
    border-color 0.3s;
}

.project-card-inner:hover .tag {
  border-color: #ffffff18;
  color: var(--text-secondary);
}

.project-card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--cyan);
  transition: gap 0.3s var(--ease-out-expo);
  margin-top: auto;
}

/* Stretched link: make the whole card navigate to its project page,
   while keeping a single semantic anchor per card. */
.project-card-link::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
}

.project-card-inner {
  cursor: pointer;
}

.project-card-link:hover {
  gap: 0.9rem;
}

/* --- Tech Stack Section --- */
.tech {
  background: var(--bg-primary);
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.tech-category-title {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.tech-items {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.tech-item {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  padding: 0.5rem 0.75rem;
  border-left: 2px solid #ffffff08;
  transition:
    border-color 0.3s,
    color 0.3s,
    transform 0.3s;
}

.tech-item:hover {
  border-color: var(--cyan);
  color: var(--text-primary);
  transform: translateX(4px);
}

/* --- Contact Section --- */
.contact {
  text-align: center;
  padding: clamp(6rem, 12vh, 10rem) 0;
}

.contact-content {
  max-width: 600px;
  margin: 0 auto;
}

.contact-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.contact-desc {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 2.5rem;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem 1.5rem;
  border: 1px solid #ffffff10;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  transition: all 0.35s var(--ease-out-expo);
}

.contact-link:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px -8px var(--cyan-dim);
}

/* --- Footer --- */
.footer {
  border-top: 1px solid #ffffff08;
  padding: 2rem var(--gutter);
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

.footer-note {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
}

/* --- Animations --- */
@keyframes fadeSlideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity 0.7s var(--ease-out-expo),
    transform 0.7s var(--ease-out-expo);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.stagger-children > * {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 0.5s var(--ease-out-expo),
    transform 0.5s var(--ease-out-expo);
}

.stagger-children.visible > *:nth-child(1) {
  transition-delay: 0s;
}
.stagger-children.visible > *:nth-child(2) {
  transition-delay: 0.08s;
}
.stagger-children.visible > *:nth-child(3) {
  transition-delay: 0.16s;
}
.stagger-children.visible > *:nth-child(4) {
  transition-delay: 0.24s;
}
.stagger-children.visible > *:nth-child(5) {
  transition-delay: 0.32s;
}
.stagger-children.visible > *:nth-child(6) {
  transition-delay: 0.4s;
}
.stagger-children.visible > *:nth-child(7) {
  transition-delay: 0.48s;
}
.stagger-children.visible > *:nth-child(8) {
  transition-delay: 0.56s;
}
.stagger-children.visible > *:nth-child(9) {
  transition-delay: 0.64s;
}
.stagger-children.visible > *:nth-child(10) {
  transition-delay: 0.72s;
}
.stagger-children.visible > *:nth-child(11) {
  transition-delay: 0.8s;
}
.stagger-children.visible > *:nth-child(12) {
  transition-delay: 0.88s;
}
.stagger-children.visible > *:nth-child(13) {
  transition-delay: 0.96s;
}
.stagger-children.visible > *:nth-child(14) {
  transition-delay: 1.04s;
}
.stagger-children.visible > *:nth-child(15) {
  transition-delay: 1.12s;
}
.stagger-children.visible > *:nth-child(16) {
  transition-delay: 1.2s;
}
.stagger-children.visible > *:nth-child(17) {
  transition-delay: 1.28s;
}
.stagger-children.visible > *:nth-child(18) {
  transition-delay: 1.36s;
}
.stagger-children.visible > *:nth-child(19) {
  transition-delay: 1.44s;
}
.stagger-children.visible > *:nth-child(20) {
  transition-delay: 1.52s;
}

.stagger-children.visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* --- Hamburger Menu --- */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

.nav-hamburger span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all 0.3s var(--ease-out-expo);
  transform-origin: center;
}

.nav-hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-hamburger.active span:nth-child(2) {
  opacity: 0;
}

.nav-hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* --- GenAI Badge --- */
.genai-badge {
  border-color: var(--violet-dim);
  color: var(--violet);
}

/* --- Suggested Skills Section --- */
.suggested-skills {
  background: var(--bg-primary);
}

.skills-intro {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 700px;
  margin-bottom: 3rem;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.skill-card {
  padding: 2rem;
  border: 1px solid #ffffff08;
  background: var(--bg-deep);
  transition:
    border-color 0.4s,
    transform 0.4s var(--ease-out-expo);
}

.skill-card:hover {
  border-color: #ffffff18;
  transform: translateY(-4px);
}

.skill-card-icon {
  margin-bottom: 1rem;
}

.skill-card h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.skill-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .expertise-grid {
    grid-template-columns: 1fr;
  }

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

  .about-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

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

@media (max-width: 768px) {
  .nav-hamburger {
    display: flex;
  }

  .nav-links {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-deep);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    z-index: 1000;
  }

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

  .nav-links.open .nav-link {
    font-size: 1.2rem;
  }

  .hero-content {
    padding-top: 6rem;
  }

  .hero-stats {
    gap: 2rem;
  }

  .hero-cta {
    flex-direction: column;
  }
  .hero-cta .btn {
    text-align: center;
    justify-content: center;
  }

  .hero-scroll-indicator {
    display: none;
  }

  .project-grid {
    grid-template-columns: 1fr;
  }

  .project-filters {
    gap: 0.4rem;
  }

  .filter-btn {
    font-size: 0.68rem;
    padding: 0.5rem 0.9rem;
  }

  .tech-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .contact-links {
    flex-direction: column;
    align-items: center;
  }

  .footer-inner {
    flex-direction: column;
    gap: 0.75rem;
    text-align: center;
  }

  .section-header {
    margin-bottom: 2.5rem;
  }

  .skills-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero-title-line {
    font-size: 2.5rem;
  }

  .expertise-card {
    padding: 1.5rem;
  }

  .project-card-inner {
    padding: 1.5rem;
  }
}