/* ========== Variables & Reset ========== */
:root {
  --bg: #0a0a0a;
  --bg-light: #111111;
  --bg-card: #161616;
  --accent: #5ce0d8;
  --accent-dim: rgba(92, 224, 216, 0.1);
  --text: #ccd6f6;
  --text-dim: #8892b0;
  --text-bright: #e6f1ff;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', monospace;
  --nav-h: 70px;
  --max-w: 1100px;
  --transition: 0.25s cubic-bezier(0.645, 0.045, 0.355, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-h);
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover { color: var(--text-bright); }

ul { list-style: none; }

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

/* ========== Skip Link (a11y) ========== */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--accent);
  color: var(--bg);
  padding: 0.5rem 1rem;
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 0.85rem;
  z-index: 200;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0.5rem;
  color: var(--bg);
}

/* ========== Focus Visible (a11y) ========== */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

:focus:not(:focus-visible) {
  outline: none;
}

/* ========== Reduced Motion (a11y) ========== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .fade-seq {
    opacity: 1;
    transform: none;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ========== Buttons ========== */
.btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.85rem;
  border-radius: 4px;
  padding: 0.75rem 1.5rem;
  cursor: pointer;
  transition: all var(--transition);
}

.btn--outline {
  border: 1px solid var(--accent);
  color: var(--accent);
  background: transparent;
}

.btn--outline:hover {
  background: var(--accent-dim);
  color: var(--accent);
}

.btn--sm { padding: 0.5rem 1rem; font-size: 0.8rem; }

.btn--accent {
  border: 1px solid var(--accent);
  color: var(--accent);
  background: transparent;
  font-size: 0.9rem;
  padding: 1rem 2rem;
}

.btn--accent:hover {
  background: var(--accent-dim);
  color: var(--accent);
}

/* ========== Nav ========== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-h);
  z-index: 100;
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: transform 0.3s ease;
}

.nav__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo svg { display: block; }

.nav__links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav__link {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--text);
  transition: color var(--transition);
}

.nav__link:hover,
.nav__link.active { color: var(--accent); }

.nav__num {
  color: var(--accent);
  margin-right: 4px;
  font-size: 0.75rem;
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 110;
}

.nav__hamburger span {
  display: block;
  width: 28px;
  height: 2px;
  background: var(--accent);
  transition: all 0.3s ease;
  transform-origin: center;
}

.nav__hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__hamburger.open span:nth-child(2) { opacity: 0; }
.nav__hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ========== Hero ========== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 0 2rem;
}

.hero__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
}

.hero__greeting {
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--accent);
  margin-bottom: 1.25rem;
}

.hero__name {
  font-size: clamp(2.5rem, 7vw, 5rem);
  font-weight: 700;
  color: var(--text-bright);
  line-height: 1.1;
}

.hero__tagline {
  font-size: clamp(1.5rem, 5vw, 3.5rem);
  font-weight: 600;
  color: var(--text-dim);
  line-height: 1.1;
  margin-top: 0.5rem;
}

.hero__desc {
  max-width: 540px;
  color: var(--text-dim);
  margin-top: 1.5rem;
  font-size: 1.05rem;
  line-height: 1.7;
}

/* Hero marquee */
.hero__marquee {
  margin-top: 2rem;
  max-width: 540px;
  overflow-x: auto;
  mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
  scrollbar-width: none;
}

.hero__marquee::-webkit-scrollbar {
  display: none;
}

.marquee__track {
  display: flex;
  gap: 1.5rem;
  width: max-content;
}

.marquee__item {
  flex-shrink: 0;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  padding: 0.35rem 0.85rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 100px;
  white-space: nowrap;
  transition: border-color var(--transition), color var(--transition);
}

.marquee__track:hover .marquee__item {
  border-color: rgba(92, 224, 216, 0.3);
  color: var(--text);
}

.hero__cta {
  margin-top: 2.5rem;
  display: flex;
  gap: 1.25rem;
}

.hero__social {
  color: var(--text-dim);
  transition: color var(--transition), transform var(--transition);
}

.hero__social:hover {
  color: var(--accent);
  transform: translateY(-3px);
}

/* Staggered fade-in */
.fade-seq {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.5s forwards;
}

.fade-seq:nth-child(1) { animation-delay: 0.2s; }
.fade-seq:nth-child(2) { animation-delay: 0.35s; }
.fade-seq:nth-child(3) { animation-delay: 0.5s; }
.fade-seq:nth-child(4) { animation-delay: 0.65s; }
.fade-seq:nth-child(5) { animation-delay: 0.8s; }
.fade-seq:nth-child(6) { animation-delay: 0.95s; }

@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========== Sections ========== */
.section {
  padding: 6rem 2rem;
}

.section__inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.section__inner--narrow {
  max-width: 600px;
  text-align: center;
}

.section__heading {
  display: flex;
  align-items: center;
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--text-bright);
  margin-bottom: 2.5rem;
  white-space: nowrap;
}

.section__heading::after {
  content: '';
  display: block;
  width: 300px;
  max-width: 40%;
  height: 1px;
  background: rgba(255, 255, 255, 0.1);
  margin-left: 1.25rem;
}

.section__num {
  font-family: var(--mono);
  font-size: 1.1rem;
  color: var(--accent);
  margin-right: 0.75rem;
  font-weight: 400;
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(25px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ========== About ========== */
.about__grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 3rem;
  align-items: start;
}

.about__text p {
  color: var(--text-dim);
  margin-bottom: 1rem;
  font-size: 1rem;
  line-height: 1.7;
}

.about__text strong { color: var(--text-bright); }

.about__tech {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem 1rem;
  margin-top: 1rem;
}

.about__tech li {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--text-dim);
  padding-left: 1.25rem;
  position: relative;
}

.about__tech li::before {
  content: '>';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.85rem;
}

.about__cards {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.about__card {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 6px;
  padding: 1.25rem;
  transition: border-color var(--transition), transform var(--transition);
}

.about__card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.about__card-icon { margin-bottom: 0.5rem; display: block; }

.about__card h3 {
  font-size: 1rem;
  color: var(--text-bright);
  margin-bottom: 0.25rem;
}

.about__card p {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.5;
}

/* ========== Experience ========== */
.exp {
  display: flex;
  gap: 2rem;
  min-height: 350px;
}

.exp__tabs {
  display: flex;
  flex-direction: column;
  border-left: 2px solid rgba(255, 255, 255, 0.1);
  flex-shrink: 0;
  width: 200px;
}

.exp__tab {
  background: none;
  border: none;
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--text-dim);
  padding: 0.75rem 1.25rem;
  text-align: left;
  cursor: pointer;
  border-left: 2px solid transparent;
  margin-left: -2px;
  transition: all var(--transition);
  white-space: nowrap;
}

.exp__tab:hover {
  background: var(--accent-dim);
  color: var(--accent);
}

.exp__tab.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--accent-dim);
}

.exp__panels { flex: 1; }

.exp__panel { display: none; }
.exp__panel.active { display: block; }

.exp__title {
  font-size: 1.15rem;
  color: var(--text-bright);
  font-weight: 500;
}

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

.exp__dates {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  margin: 0.5rem 0 1.25rem;
}

.exp__list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.exp__list li {
  color: var(--text-dim);
  font-size: 0.95rem;
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.6;
}

.exp__list li::before {
  content: '>';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-family: var(--mono);
}

/* ========== Projects ========== */
.projects__featured {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
  margin-bottom: 4rem;
}

.project-card {
  position: relative;
}

.project-card__inner {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 6px;
  padding: 2rem;
  height: 100%;
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.project-card__inner:hover {
  border-color: var(--accent);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.project-card__top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.5rem;
}

.project-card__links {
  display: flex;
  gap: 0.75rem;
}

.project-card__links a {
  color: var(--text-dim);
  transition: color var(--transition);
}

.project-card__links a:hover { color: var(--accent); }

.project-card__title {
  font-size: 1.2rem;
  color: var(--text-bright);
  margin-bottom: 0.75rem;
}

.project-card__desc {
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.6;
  flex: 1;
}

.project-card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-dim);
}

.projects__other-heading {
  text-align: center;
  font-size: 1.4rem;
  color: var(--text-bright);
  margin-bottom: 2rem;
}

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

/* ========== Contact ========== */
.section--contact {
  padding: 8rem 2rem;
}

.contact__overline {
  font-family: var(--mono);
  font-size: 0.9rem;
  color: var(--accent);
  margin-bottom: 1rem;
}

.contact__heading {
  font-size: clamp(2rem, 5vw, 3rem);
  color: var(--text-bright);
  margin-bottom: 1.25rem;
}

.contact__text {
  color: var(--text-dim);
  max-width: 500px;
  margin: 0 auto 2rem;
  line-height: 1.7;
}

/* ========== Footer ========== */
.footer {
  padding: 2rem;
  text-align: center;
}

.footer__socials {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 1.25rem;
}

.footer__socials a {
  color: var(--text-dim);
  transition: color var(--transition), transform var(--transition);
}

.footer__socials a:hover {
  color: var(--accent);
  transform: translateY(-3px);
}

.footer__credit {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-dim);
}

/* ========== Responsive ========== */

/* Tablet */
@media (max-width: 768px) {
  .nav__links {
    position: fixed;
    top: 0;
    right: 0;
    width: min(75vw, 320px);
    height: 100vh;
    background: var(--bg-light);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.5);
  }

  .nav__links.open {
    transform: translateX(0);
  }

  .nav__hamburger {
    display: flex;
  }

  .about__grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .about__cards {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .about__card { flex: 1; min-width: 140px; }

  .exp {
    flex-direction: column;
  }

  .exp__tabs {
    flex-direction: row;
    border-left: none;
    border-bottom: 2px solid rgba(255, 255, 255, 0.1);
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .exp__tab {
    border-left: none;
    border-bottom: 2px solid transparent;
    margin-left: 0;
    margin-bottom: -2px;
    padding: 0.75rem 1rem;
    font-size: 0.78rem;
  }

  .exp__tab.active {
    border-left-color: transparent;
    border-bottom-color: var(--accent);
  }

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

/* Mobile */
@media (max-width: 480px) {
  .section { padding: 4rem 1.25rem; }

  .hero { padding: 0 1.25rem; }

  .nav__inner { padding: 0 1.25rem; }

  .section__heading {
    font-size: 1.4rem;
  }

  .section__heading::after {
    max-width: 25%;
  }

  .about__cards {
    flex-direction: column;
  }

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

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

  .section--contact {
    padding: 5rem 1.25rem;
  }
}

/* Body scroll lock */
body.menu-open {
  overflow: hidden;
}