:root {
  --accent: #1E90FF;
  --accent-strong: #0b74d5;
  --accent-glow: rgba(30, 144, 255, 0.35);
  --bg: #f6f8fb;
  --bg-soft: #ffffff;
  --text: #0f172a;
  --muted: #5b6b7c;
  --card: #ffffff;
  --card-border: rgba(30, 144, 255, 0.18);
  --header-bg: rgba(246, 248, 251, 0.82);
  --footer-bg: #0a0d14;
  --contact-grad: linear-gradient(135deg, #0b74d5 0%, #1E90FF 60%, #4da6ff 100%);
  --bubble: rgba(30, 144, 255, 0.10);
}

[data-theme="dark"] {
  --bg: #05070c;
  --bg-soft: #0b1018;
  --text: #f0f4f9;
  --muted: #8fa1b5;
  --card: #0d1420;
  --card-border: rgba(30, 144, 255, 0.25);
  --header-bg: rgba(5, 7, 12, 0.82);
  --footer-bg: #030408;
  --bubble: rgba(30, 144, 255, 0.14);
}

* { margin: 0; padding: 0; box-sizing: border-box; text-decoration: none; border: none; outline: none; }

html {
  font-size: 62.5%;
  scroll-behavior: smooth;
  scroll-padding-top: 9rem;
}

body {
  width: 100%;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: 'Poppins', 'Kantumruy Pro', sans-serif;
  transition: background 0.35s ease, color 0.35s ease;
}

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

::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 8px; }

/* ── Header ───────────────── */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 1.6rem 9%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 100;
  transition: background 0.3s ease, box-shadow 0.3s ease, padding 0.3s ease;
}
header.scrolled {
  background: var(--header-bg);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.18);
  padding: 1rem 9%;
}

.logo {
  font-size: 3rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: 0.5px;
  transition: transform 0.3s ease;
}
.logo:hover { transform: scale(1.06); }
.logo span { color: var(--text); }

nav a {
  font-size: 1.6rem;
  color: var(--text);
  margin-left: 3.2rem;
  font-weight: 500;
  padding-bottom: 4px;
  border-bottom: 3px solid transparent;
  transition: color 0.3s ease, border-color 0.3s ease;
}
nav a:hover,
nav a.active { color: var(--accent); border-bottom: 3px solid var(--accent); }

.actions { display: flex; align-items: center; gap: 1rem; }

.icon-btn {
  width: 4.2rem;
  height: 4.2rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--text);
  border: 2px solid var(--accent);
  font-size: 1.7rem;
  cursor: pointer;
  transition: all 0.3s ease;
}
.icon-btn:hover {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 20px var(--accent-glow);
  transform: translateY(-2px);
}
.lang-btn { font-size: 1.25rem; font-weight: 700; letter-spacing: 0.5px; }
.hamburger { display: none; }

/* ── Shared sections ───────── */
.section { position: relative; padding: 10rem 9%; min-height: auto; }

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 1.2rem;
  color: var(--accent);
  font-size: 1.45rem;
  font-weight: 600;
  letter-spacing: 0.4rem;
  text-transform: uppercase;
  margin-bottom: 1.4rem;
}
.section-label::before {
  content: "";
  width: 4.5rem;
  height: 2px;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent-glow);
}
.section-title {
  font-size: 3.6rem;
  font-weight: 700;
  margin-bottom: 1.6rem;
  letter-spacing: -0.5px;
  line-height: 1.25;
}
.section-desc { color: var(--muted); font-size: 1.6rem; max-width: 62rem; }

/* ── Home / hero ───────────── */
.home {
  min-height: 100vh;
  padding: 12rem 9% 6rem;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 7rem;
  position: relative;
  overflow: hidden;
  background: var(--bg);
}
.home::before,
.home::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  pointer-events: none;
  z-index: 0;
}
.home::before { width: 38rem; height: 38rem; background: var(--bubble); top: 5%; left: -9rem; animation: floatOrb 10s ease-in-out infinite; }
.home::after { width: 30rem; height: 30rem; background: var(--bubble); bottom: 0; right: -7rem; animation: floatOrb 13s ease-in-out infinite reverse; }

.home-content, .home-img { position: relative; z-index: 1; }

.eyebrow {
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: 0.35rem;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.4rem;
  display: inline-flex;
  align-items: center;
  gap: 1rem;
}
.eyebrow::after { content: ""; width: 5rem; height: 1px; background: var(--accent); box-shadow: 0 0 8px var(--accent-glow); }

.home h1 { font-size: 5.4rem; font-weight: 700; line-height: 1.25; }
.home h1 .name { color: var(--accent); text-shadow: 0 0 18px var(--accent-glow); }

.typing-text { font-size: 3rem; font-weight: 600; margin: 0.4rem 0 1.6rem; min-height: 3.4rem; }
#typing { color: var(--accent); }
.cursor { display: inline-block; width: 3px; height: 2.8rem; margin-left: 3px; vertical-align: text-bottom; background: var(--accent); animation: blink 0.85s step-end infinite; }

.home-content p { font-size: 1.7rem; color: var(--muted); max-width: 56rem; line-height: 1.75; text-align: justify; }

.social-icons { margin: 2.6rem 0; display: flex; gap: 1.6rem; }
.social-icons a {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 5.4rem;
  height: 5.4rem;
  background: transparent;
  border: 2px solid var(--accent);
  border-radius: 50%;
  color: var(--accent);
  font-size: 2.2rem;
  transition: 0.3s ease;
}
.social-icons a:hover {
  color: #fff;
  background: var(--accent);
  transform: scale(1.15) translateY(-5px);
  box-shadow: 0 0 26px var(--accent-glow);
}

.hero-actions { display: flex; gap: 1.6rem; flex-wrap: wrap; margin-bottom: 3.4rem; }

.btn {
  display: inline-block;
  padding: 1.2rem 3rem;
  border-radius: 4rem;
  font-size: 1.55rem;
  font-weight: 600;
  letter-spacing: 0.2rem;
  color: #fff;
  background: var(--accent);
  border: 2px solid var(--accent);
  cursor: pointer;
  transition: 0.3s ease;
}
.btn:hover {
  box-shadow: 0 0 26px var(--accent-glow);
  transform: translateY(-2px);
}
.btn-ghost {
  background: transparent;
  color: var(--accent);
}
.btn-ghost:hover { color: #fff; background: var(--accent); }

.hero-stats { display: flex; gap: 4.5rem; flex-wrap: wrap; }
.hero-stat .num { font-size: 2.6rem; font-weight: 800; color: var(--accent); }
.hero-stat .label { font-size: 1.25rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.15rem; margin-top: 0.2rem; }

.home-img {
  width: 30rem;
  flex-shrink: 0;
  position: relative;
}
.home-img .ring {
  position: absolute;
  inset: -1.3rem;
  border-radius: 50%;
  border: 2px dashed var(--accent);
  opacity: 0.7;
  animation: spin 26s linear infinite;
}
.home-img img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: 50%;
  display: block;
  border: 3px solid var(--accent);
  box-shadow: 0 0 40px var(--accent-glow);
}

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes blink { 50% { opacity: 0; } }
@keyframes floatOrb {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(2rem, -2.5rem); }
}

/* ── About ─────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 5rem;
  align-items: start;
  margin-top: 2.5rem;
}
.about-text p { color: var(--muted); font-size: 1.6rem; margin-bottom: 1.6rem; text-align: justify; line-height: 1.8; }
.about-text strong { color: var(--accent); }

.about-cards { display: grid; gap: 1.4rem; }
.info-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 1.8rem;
  padding: 1.6rem 2rem;
  display: flex;
  gap: 1.6rem;
  align-items: center;
  transition: all 0.3s ease;
}
.info-card:hover {
  border-color: var(--accent);
  box-shadow: 0 10px 30px var(--accent-glow);
  transform: translateY(-3px);
}
.info-card .icon {
  width: 4.6rem;
  height: 4.6rem;
  flex-shrink: 0;
  border-radius: 1.2rem;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.9rem;
  box-shadow: 0 0 16px var(--accent-glow);
}
.info-card .label { font-size: 1.15rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.1rem; }
.info-card .value { font-size: 1.5rem; font-weight: 600; margin-top: 0.2rem; }

/* ── Skills ─────────────────── */
.skills-wrap { margin-top: 3rem; display: grid; gap: 2.6rem; }
.skill-group h3 {
  font-size: 1.5rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15rem;
  color: var(--accent);
  margin-bottom: 1.3rem;
  display: flex;
  align-items: center;
  gap: 1.2rem;
}
.skill-group h3::after { content: ""; flex: 1; height: 1px; background: var(--card-border); }
.chips { display: flex; flex-wrap: wrap; gap: 1rem; }
.chip {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 999px;
  padding: 0.8rem 1.8rem;
  font-size: 1.45rem;
  font-weight: 500;
  color: var(--text);
  transition: all 0.25s ease;
}
.chip:hover {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 14px var(--accent-glow);
  transform: translateY(-2px);
}
.chip strong { color: var(--accent); font-weight: 700; }
.chip.off { opacity: 0.55; }

/* ── Projects ───────────────── */
.projects-grid { margin-top: 3.5rem; display: grid; gap: 2.8rem; }
.project-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 2rem;
  padding: 3rem;
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
}
.project-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s ease;
}
.project-card:hover {
  border-color: var(--accent);
  box-shadow: 0 14px 44px var(--accent-glow);
  transform: translateY(-5px);
}
.project-card:hover::before { transform: scaleX(1); }

.project-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 1.6rem; flex-wrap: wrap; margin-bottom: 1.6rem; }
.project-title { font-size: 2rem; font-weight: 700; }
.project-tagline { color: var(--muted); font-size: 1.35rem; font-weight: 500; margin-top: 0.2rem; }
.role-badge {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--accent);
  border: 1.5px solid var(--accent);
  border-radius: 999px;
  padding: 0.5rem 1.4rem;
  white-space: nowrap;
  box-shadow: 0 0 12px var(--accent-glow);
}

.project-body { list-style: none; color: var(--muted); font-size: 1.5rem; display: grid; gap: 1rem; }
.project-body li { position: relative; padding-left: 2rem; line-height: 1.7; }
.project-body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.9rem;
  width: 0.8rem;
  height: 0.8rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
}

.project-tags { margin-top: 2rem; display: flex; flex-wrap: wrap; gap: 0.8rem; }
.tag {
  background: var(--accent);
  color: #fff;
  font-size: 1.2rem;
  font-weight: 600;
  padding: 0.4rem 1.3rem;
  border-radius: 999px;
  opacity: 0.92;
}
.project-links { margin-top: 2rem; }
.project-links a {
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  transition: all 0.25s ease;
}
.project-links a:hover { text-shadow: 0 0 12px var(--accent-glow); transform: translateX(3px); }

/* ── Education ──────────────── */
.edu-grid { margin-top: 3rem; display: grid; gap: 1.8rem; }
.edu-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 1.8rem;
  padding: 2.2rem 2.6rem;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 2rem;
  flex-wrap: wrap;
  transition: all 0.3s ease;
}
.edu-card:hover {
  border-color: var(--accent);
  box-shadow: 0 10px 30px var(--accent-glow);
  transform: translateY(-3px);
}
.edu-card h3 { font-size: 1.8rem; font-weight: 700; }
.edu-card .school { color: var(--muted); font-size: 1.45rem; margin-top: 0.3rem; }
.edu-card .date {
  font-size: 1.25rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border-radius: 999px;
  padding: 0.6rem 1.6rem;
  white-space: nowrap;
  box-shadow: 0 0 12px var(--accent-glow);
}
.edu-note { margin-top: 2.4rem; display: flex; flex-wrap: wrap; gap: 1.1rem; }

/* ── Contact ────────────────── */
.contact {
  background: var(--contact-grad);
  text-align: center;
  color: #fff;
}
.contact-inner { max-width: 76rem; margin: 0 auto; }
.contact .section-title { color: #fff; }
.contact .section-desc { color: #dcedff; margin-left: auto; margin-right: auto; }
.contact-links {
  margin-top: 3.2rem;
  display: flex;
  justify-content: center;
  gap: 1.6rem;
  flex-wrap: wrap;
}
.contact-links a {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  padding: 1.3rem 2.6rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  border: 1.5px solid rgba(255, 255, 255, 0.45);
  color: #fff;
  font-size: 1.5rem;
  font-weight: 600;
  transition: all 0.3s ease;
}
.contact-links a:hover {
  background: #fff;
  color: var(--accent-strong);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  transform: translateY(-3px);
}

footer { background: var(--footer-bg); color: var(--muted); text-align: center; padding: 2.4rem; font-size: 1.35rem; }

/* ── Reveal animation ───────── */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.in-view { opacity: 1; transform: none; }

/* ── Responsive ─────────────── */
@media (max-width: 995px) {
  nav {
    position: absolute;
    top: 0;
    right: 0;
    width: 60%;
    max-width: 32rem;
    display: none;
    flex-direction: column;
    background: var(--bg-soft);
    border-left: 3px solid var(--accent);
    border-bottom: 3px solid var(--accent);
    border-bottom-left-radius: 2rem;
    padding: 7rem 2.5rem 2.5rem;
    box-shadow: -8px 12px 30px rgba(0, 0, 0, 0.25);
  }
  nav.active { display: flex; }
  nav a { display: block; margin: 1.4rem 0; font-size: 1.9rem; width: fit-content; }
  nav a:hover,
  nav a.active {
    padding: 0.3rem 1rem;
    border-radius: 0.5rem;
    border-bottom: 0.5rem solid var(--accent);
  }
  .hamburger { display: flex; }

  .home { flex-direction: column; gap: 4.5rem; padding-top: 11rem; text-align: center; }
  .home-content p { margin: 0 auto; }
  .social-icons, .hero-actions, .hero-stats { justify-content: center; }
  .eyebrow::after { display: none; }
  .home h1 { font-size: 4.2rem; }
  .typing-text { font-size: 2.4rem; }
  .home-img { width: 24rem; }

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