/* ============ Variables & Reset ============ */
:root {
  --bg: #0a0f1a;
  --bg-soft: #101828;
  --bg-card: #131e30;
  --border: #1f2d45;
  --text: #c9d4e8;
  --text-strong: #eef3fb;
  --text-dim: #8b98b3;
  --accent: #2dd4bf;
  --accent-dim: rgba(45, 212, 191, 0.1);
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
  --nav-h: 68px;
}

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

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* Subtle background glow */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(600px 400px at 85% -5%, rgba(45, 212, 191, 0.07), transparent),
    radial-gradient(500px 350px at 5% 40%, rgba(99, 102, 241, 0.05), transparent);
  pointer-events: none;
  z-index: 0;
}

main, .nav, .footer { position: relative; z-index: 1; }

.container { max-width: 1040px; margin: 0 auto; padding: 0 24px; }
.mono { font-family: var(--font-mono); }
.accent { color: var(--accent); }
.accent-small { color: var(--accent); font-size: 0.65em; font-weight: 500; }

a { color: inherit; text-decoration: none; transition: color 0.2s; }
p a.accent:hover { text-decoration: underline; }
ul { list-style: none; }
strong { color: var(--text-strong); }

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

/* ============ Buttons ============ */
.btn {
  display: inline-block;
  padding: 12px 26px;
  border: 1px solid var(--accent);
  border-radius: 6px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
  background: transparent;
}
.btn:hover { background: var(--accent-dim); transform: translateY(-2px); }
.btn--primary { background: var(--accent); color: #04211c; font-weight: 600; }
.btn--primary:hover { background: #43e0cd; box-shadow: 0 8px 24px rgba(45, 212, 191, 0.25); }
.btn--small { padding: 8px 18px; font-size: 13px; }
.btn--big { padding: 16px 38px; font-size: 16px; }

/* ============ Nav ============ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: rgba(10, 15, 26, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  z-index: 100;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.nav.scrolled { border-color: var(--border); box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35); }
.nav__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.nav__logo { font-size: 20px; font-weight: 600; color: var(--text-strong); }
.nav__links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14.5px;
}
.nav__links a:not(.btn) { color: var(--text); }
.nav__links a:not(.btn):hover { color: var(--accent); }
.nav__actions { display: flex; align-items: center; gap: 14px; }

.lang-toggle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  padding: 7px 12px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}
.lang-toggle:hover { border-color: var(--accent); color: var(--accent); }

.nav__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav__burger span {
  width: 24px; height: 2px;
  background: var(--text-strong);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}
.nav__burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger.open span:nth-child(2) { opacity: 0; }
.nav__burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============ Hero ============ */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: var(--nav-h);
}
.hero__hello { font-size: 16px; margin-bottom: 18px; }
.hero__name {
  font-size: clamp(42px, 8vw, 76px);
  font-weight: 800;
  color: var(--text-strong);
  line-height: 1.05;
}
.hero__title {
  font-size: clamp(26px, 5vw, 48px);
  font-weight: 700;
  color: var(--text-dim);
  line-height: 1.15;
  margin: 10px 0 26px;
  max-width: 820px;
}
.hero__desc { max-width: 620px; color: var(--text); margin-bottom: 36px; }
.hero__cta { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 42px; }
.hero__social { display: flex; gap: 22px; }
.hero__social a { color: var(--text-dim); }
.hero__social a:hover { color: var(--accent); transform: translateY(-2px); }
.hero__social a { transition: color 0.2s, transform 0.2s; display: inline-flex; }

/* ============ Sections ============ */
.section { padding: 90px 24px; }
.section__title {
  font-size: clamp(24px, 4vw, 30px);
  font-weight: 700;
  color: var(--text-strong);
  margin-bottom: 44px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.section__title::after {
  content: '';
  flex: 1;
  max-width: 280px;
  height: 1px;
  background: var(--border);
  margin-left: 12px;
}
.section__title .mono { font-size: 0.75em; font-weight: 500; }

/* ============ About ============ */
.about__grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 48px;
  align-items: start;
}
.about__text p { margin-bottom: 16px; }
.about__stack {
  display: grid;
  grid-template-columns: repeat(2, minmax(140px, 1fr));
  gap: 8px 16px;
  margin-top: 8px;
  font-size: 13.5px;
}
.about__stack li { position: relative; padding-left: 20px; color: var(--text-dim); }
.about__stack li::before { content: '▸'; position: absolute; left: 0; color: var(--accent); }

.about__photo { display: flex; justify-content: center; }
.about__photo-frame {
  position: relative;
  width: 260px;
  aspect-ratio: 1;
  border-radius: 10px;
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border);
}
.about__photo-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 2px solid var(--accent);
  border-radius: 10px;
  transform: translate(14px, 14px);
  pointer-events: none;
  transition: transform 0.25s;
  z-index: -1;
}
.about__photo-frame img { width: 100%; height: 100%; object-fit: cover; display: block; }
.about__photo-placeholder {
  width: 100%; height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 64px;
  font-weight: 600;
  color: var(--accent);
  background: linear-gradient(135deg, var(--bg-card), var(--accent-dim));
}

/* ============ Timeline (Experience) ============ */
.timeline {
  position: relative;
  padding-left: 32px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: var(--border);
}
.timeline__item { position: relative; padding-bottom: 48px; }
.timeline__item:last-child { padding-bottom: 0; }
.timeline__dot {
  position: absolute;
  left: -32px;
  top: 5px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--bg);
  border: 3px solid var(--accent);
}
.timeline__date { font-size: 13px; color: var(--text-dim); margin-bottom: 6px; }
.timeline__role { font-size: 20px; font-weight: 700; color: var(--text-strong); margin-bottom: 10px; }
.timeline__desc { max-width: 760px; margin-bottom: 14px; }
.timeline__tags { display: flex; flex-wrap: wrap; gap: 8px; }
.timeline__tags li {
  font-size: 12.5px;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--accent-dim);
  color: var(--accent);
}

/* ============ Projects ============ */
.featured {
  background: linear-gradient(135deg, var(--bg-card), rgba(45, 212, 191, 0.06));
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 40px;
  margin-bottom: 28px;
  transition: transform 0.25s, border-color 0.25s;
}
.featured:hover { border-color: rgba(45, 212, 191, 0.4); }
.featured__label { font-size: 13px; margin-bottom: 8px; }
.featured__title { font-size: 32px; font-weight: 800; color: var(--text-strong); margin-bottom: 14px; }
.featured__desc { max-width: 720px; margin-bottom: 18px; }
.featured .card__tags { margin-bottom: 24px; }

.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 20px;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}
.card:hover {
  transform: translateY(-6px);
  border-color: rgba(45, 212, 191, 0.4);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
}
.card__top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 18px;
}
.card__icon { color: var(--accent); }
.card__links { display: flex; gap: 12px; }
.card__links a { color: var(--text-dim); display: inline-flex; }
.card__links a:hover { color: var(--accent); }
.card__title { font-size: 19px; font-weight: 700; color: var(--text-strong); margin-bottom: 10px; }
.card__desc { font-size: 15px; color: var(--text); flex: 1; margin-bottom: 18px; }
.card__tags { display: flex; flex-wrap: wrap; gap: 8px; }
.card__tags li {
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--accent-dim);
  color: var(--accent);
}
.projects__more { text-align: center; margin-top: 36px; font-size: 15.5px; }

/* ============ Skills ============ */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.skills__group {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 26px;
}
.skills__group h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.skills__chips { display: flex; flex-wrap: wrap; gap: 8px; }
.skills__chips li {
  font-size: 13px;
  font-family: var(--font-mono);
  padding: 5px 12px;
  border-radius: 6px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  color: var(--text);
}
.skills__list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 10px;
  font-size: 14.5px;
  color: var(--text);
}
.skills__list li::before { content: '▸'; position: absolute; left: 0; color: var(--accent); }

/* ============ Contact ============ */
.section--contact {
  text-align: center;
  max-width: 660px;
  padding-top: 110px;
  padding-bottom: 130px;
}
.section--contact .mono { font-size: 15px; margin-bottom: 14px; }
.contact__title {
  font-size: clamp(36px, 6vw, 54px);
  font-weight: 800;
  color: var(--text-strong);
  margin-bottom: 18px;
}
.contact__desc { margin-bottom: 36px; color: var(--text); }
.contact__alt {
  margin-top: 28px;
  display: flex;
  justify-content: center;
  gap: 14px;
  font-size: 15px;
  color: var(--text-dim);
}
.contact__alt a { color: var(--text-dim); border-bottom: 1px dashed var(--border); }
.contact__alt a:hover { color: var(--accent); border-color: var(--accent); }

/* ============ Footer ============ */
.footer {
  text-align: center;
  padding: 28px 24px;
  font-size: 12.5px;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
}

/* ============ Reveal animations ============ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ============ Responsive ============ */
@media (max-width: 820px) {
  .about__grid { grid-template-columns: 1fr; }
  .about__photo { order: -1; }
  .about__photo-frame { width: 200px; }
  .featured { padding: 28px; }
}

@media (max-width: 700px) {
  .nav__burger { display: flex; }
  .nav__links {
    position: fixed;
    top: var(--nav-h);
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    background: var(--bg-soft);
    border: 1px solid var(--border);
    border-right: none;
    border-radius: 10px 0 0 10px;
    padding: 20px 28px;
    transform: translateX(110%);
    transition: transform 0.3s ease;
    box-shadow: -10px 10px 40px rgba(0, 0, 0, 0.4);
  }
  .nav__links.open { transform: translateX(0); }
  .nav__links a { padding: 8px 0; font-size: 16px; }
  .nav__links .btn { margin-top: 8px; }
  .section { padding: 64px 24px; }
  .hero { min-height: 92vh; }
}