:root {
  --bg: #070b1a;
  --bg-soft: #0f1833;
  --text: #eaf0ff;
  --text-soft: #a7b4d6;
  --primary: #6f8cff;
  --primary-strong: #5573f7;
  --accent: #00d4ff;
  --card: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.14);
  --shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
}

body.light-theme {
  --bg: #f5f8ff;
  --bg-soft: #ffffff;
  --text: #101933;
  --text-soft: #516082;
  --primary: #3f5fff;
  --primary-strong: #314dde;
  --accent: #008ccf;
  --card: rgba(16, 25, 51, 0.05);
  --border: rgba(16, 25, 51, 0.12);
  --shadow: 0 18px 30px rgba(40, 56, 94, 0.15);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  background: radial-gradient(circle at 20% 15%, #1a2550 0%, var(--bg) 44%);
  color: var(--text);
  line-height: 1.6;
}

body.light-theme {
  background: radial-gradient(circle at 20% 15%, #e9efff 0%, var(--bg) 44%);
}

.container {
  width: min(1120px, 92vw);
  margin: 0 auto;
}

.section {
  position: relative;
  padding: 5rem 0;
}

h1,
h2,
h3 {
  line-height: 1.2;
  margin-top: 0;
}

h1 {
  font-size: clamp(2rem, 6vw, 3.6rem);
}

h2 {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  margin-bottom: 1.2rem;
}

p {
  color: var(--text-soft);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg-soft) 74%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-height: 74px;
}

.brand {
  font-weight: 800;
  color: var(--text);
  text-decoration: none;
  letter-spacing: 0.4px;
}

.main-nav {
  margin-left: auto;
  display: flex;
  gap: 1rem;
  align-items: center;
}

.main-nav a,
.theme-toggle {
  color: var(--text);
  text-decoration: none;
  border: 1px solid transparent;
  padding: 0.5rem 0.8rem;
  border-radius: 10px;
  font-weight: 600;
}

.main-nav a:hover,
.theme-toggle:hover {
  border-color: var(--border);
  background: var(--card);
}

.cv-link {
  background: linear-gradient(120deg, var(--primary), var(--accent));
  color: #fff !important;
}

.theme-toggle {
  background: transparent;
  margin-left: 0.2rem;
  cursor: pointer;
}

.menu-toggle {
  display: none;
  margin-left: auto;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 10px;
  width: 46px;
  height: 42px;
  padding: 8px;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
}

.hero {
  overflow: hidden;
  padding-top: 6.4rem;
}

.hero-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
}

.kicker {
  display: inline-block;
  color: #fff;
  background: linear-gradient(120deg, var(--primary), var(--accent));
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  font-size: 0.88rem;
  font-weight: 700;
}

.hero-copy {
  max-width: 58ch;
}

.hero-actions {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  margin-top: 1.7rem;
}

.btn {
  text-decoration: none;
  border-radius: 12px;
  padding: 0.75rem 1rem;
  font-weight: 700;
}

.btn-primary {
  background: linear-gradient(120deg, var(--primary), var(--accent));
  color: #fff;
}

.btn-secondary {
  color: var(--text);
  border: 1px solid var(--border);
  background: var(--card);
}

.hero-card,
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.2rem;
  box-shadow: var(--shadow);
}

.hero-card ul {
  margin: 0;
  padding-left: 1.2rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.card h3 {
  margin-bottom: 0.4rem;
}

.tag {
  display: inline-block;
  margin-top: 0.75rem;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text);
  background: color-mix(in srgb, var(--primary) 32%, transparent);
  padding: 0.3rem 0.6rem;
  border-radius: 999px;
}

.mail-link {
  display: inline-block;
  margin-top: 0.4rem;
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
}

.site-footer {
  padding: 2rem 0 2.4rem;
  border-top: 1px solid var(--border);
}

.back-to-top {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  width: 42px;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-soft);
  color: var(--text);
  cursor: pointer;
  opacity: 0;
  transform: translateY(16px);
  pointer-events: none;
  transition: 220ms ease;
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.bg-glow {
  position: absolute;
  width: 320px;
  height: 320px;
  border-radius: 999px;
  filter: blur(56px);
  opacity: 0.32;
  pointer-events: none;
}

.bg-glow-a {
  background: var(--primary);
  top: 4rem;
  right: -80px;
}

.bg-glow-b {
  background: var(--accent);
  bottom: 0;
  left: -120px;
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 460ms ease, transform 460ms ease;
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 900px) {
  .hero-grid,
  .cards {
    grid-template-columns: 1fr;
  }

  .menu-toggle {
    display: block;
  }

  .main-nav {
    position: absolute;
    top: 74px;
    left: 0;
    right: 0;
    margin: 0;
    display: grid;
    gap: 0.3rem;
    padding: 0.7rem 4vw 1rem;
    background: var(--bg-soft);
    border-bottom: 1px solid var(--border);
    transform: scaleY(0);
    transform-origin: top;
    opacity: 0;
    pointer-events: none;
    transition: 220ms ease;
  }

  .main-nav.open {
    transform: scaleY(1);
    opacity: 1;
    pointer-events: auto;
  }
}