:root {
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --bg-page: oklch(12% 0.03 252);
  --bg-overlay: radial-gradient(circle at 20% 10%, oklch(38% 0.08 250 / 0.2) 0%, transparent 45%), radial-gradient(circle at 78% 6%, oklch(45% 0.07 215 / 0.18) 0%, transparent 42%);
  --text-primary: oklch(97% 0.01 250);
  --text-secondary: oklch(81% 0.02 252);
  --line-soft: oklch(85% 0.01 250 / 0.2);
  --glass-bg: oklch(100% 0 0 / 0.09);
  --glass-bg-strong: oklch(100% 0 0 / 0.12);
  --glass-border: oklch(94% 0.01 250 / 0.24);
  --accent: oklch(76% 0.13 235);
  --accent-2: oklch(79% 0.11 190);
  --button-text: oklch(99% 0.01 250);
  --star-opacity: 0.9;
  --shadow-main: 0 14px 45px oklch(4% 0.02 250 / 0.45);
}

[data-theme="light"] {
  --bg-page: oklch(95% 0.01 252);
  --bg-overlay: radial-gradient(circle at 15% 14%, oklch(85% 0.05 235 / 0.38) 0%, transparent 48%), radial-gradient(circle at 84% 8%, oklch(90% 0.04 200 / 0.35) 0%, transparent 44%);
  --text-primary: oklch(21% 0.02 255);
  --text-secondary: oklch(42% 0.02 255);
  --line-soft: oklch(30% 0.01 250 / 0.22);
  --glass-bg: oklch(100% 0 0 / 0.34);
  --glass-bg-strong: oklch(100% 0 0 / 0.46);
  --glass-border: oklch(33% 0.01 255 / 0.16);
  --accent: oklch(54% 0.17 245);
  --accent-2: oklch(58% 0.14 210);
  --button-text: oklch(100% 0 0);
  --star-opacity: 0.42;
  --shadow-main: 0 12px 36px oklch(35% 0.03 250 / 0.22);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text-primary);
  background-color: var(--bg-page);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -3;
  background-image: var(--bg-overlay), url("../resources/sky-dark.svg");
  background-size: cover;
  background-position: center;
  filter: saturate(1.05) contrast(1.03);
}

[data-theme="light"] body::before {
  background-image: var(--bg-overlay), url("../resources/sky-light.svg");
}

.stars {
  position: fixed;
  inset: -12%;
  z-index: -2;
  pointer-events: none;
  opacity: var(--star-opacity);
  background-repeat: repeat;
}

.stars-a {
  background-image: radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.8) 0 1.1px, transparent 1.4px), radial-gradient(circle at 80% 60%, rgba(255, 255, 255, 0.7) 0 1px, transparent 1.5px), radial-gradient(circle at 40% 80%, rgba(255, 255, 255, 0.6) 0 0.9px, transparent 1.3px);
  background-size: 260px 260px, 320px 320px, 210px 210px;
  animation: driftA 36s linear infinite;
}

.stars-b {
  background-image: radial-gradient(circle at 65% 20%, rgba(255, 255, 255, 0.62) 0 0.8px, transparent 1.2px), radial-gradient(circle at 10% 90%, rgba(255, 255, 255, 0.55) 0 0.9px, transparent 1.2px), radial-gradient(circle at 70% 75%, rgba(255, 255, 255, 0.45) 0 0.8px, transparent 1.1px);
  background-size: 180px 180px, 240px 240px, 140px 140px;
  mix-blend-mode: screen;
  animation: driftB 48s linear infinite;
}

@keyframes driftA {
  0% {
    transform: translate3d(0, 0, 0) scale(1);
  }
  100% {
    transform: translate3d(-80px, -50px, 0) scale(1.08);
  }
}

@keyframes driftB {
  0% {
    transform: translate3d(0, 0, 0) scale(1);
  }
  100% {
    transform: translate3d(75px, 45px, 0) scale(1.07);
  }
}

.glass-surface,
.glass-soft,
.icon-btn,
.btn-glass {
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
}

.glass-surface {
  contain: paint;
  will-change: transform;
}

.glass-soft,
.icon-btn,
.btn-glass {
  border-radius: 12px;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  border-left: none;
  border-right: none;
  border-top: none;
  border-radius: 0 0 18px 18px;
  box-shadow: var(--shadow-main);
}

.header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.logo-wrap {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
}

.logo {
  width: 56px;
  height: 56px;
  object-fit: contain;
}

[data-theme="dark"] .logo {
  filter: drop-shadow(0 1px 4px rgba(0, 0, 0, 0.25));
}

[data-theme="light"] .logo {
  filter: drop-shadow(0 1px 2px rgba(255, 255, 255, 0.5));
}

.brand {
  font-weight: 700;
  letter-spacing: 0.02em;
  font-size: 1rem;
}

.main-nav {
  display: none;
  gap: 16px;
}

.main-nav a {
  text-decoration: none;
  color: var(--text-primary);
  opacity: 0.88;
  font-weight: 500;
  font-size: 0.95rem;
}

.main-nav a:hover {
  opacity: 1;
}

.controls {
  display: flex;
  gap: 10px;
  align-items: center;
}

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  padding: 3px;
  background: var(--glass-bg);
  backdrop-filter: blur(16px) saturate(1.12);
  -webkit-backdrop-filter: blur(16px) saturate(1.12);
}

.lang-btn {
  border: none;
  background: transparent;
  color: var(--text-primary);
  border-radius: 999px;
  min-width: 40px;
  height: 30px;
  font-weight: 700;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: background-color 0.25s cubic-bezier(0.4, 0, 0.2, 1), color 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.lang-btn.is-active {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--button-text);
}

.lang-btn:hover,
.lang-btn:focus-visible {
  background-color: var(--glass-bg-strong);
}

.icon-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  color: var(--text-primary);
  display: grid;
  place-items: center;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1), background-color 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

.icon-btn:hover,
.icon-btn:focus-visible {
  transform: translateY(-1px) scale(1.04);
  background: var(--glass-bg-strong);
}

.page-content {
  width: min(1120px, 94vw);
  margin: 0 auto;
  padding: 98px 0 38px;
  display: grid;
  gap: 18px;
}

.hero,
.content-section,
.site-footer {
  border-radius: 22px;
  padding: 22px 18px;
  box-shadow: var(--shadow-main);
}

.hero {
  display: grid;
  gap: 14px;
}

.eyebrow {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-secondary);
  margin: 0;
}

h1 {
  margin: 0;
  font-size: clamp(1.8rem, 5.6vw, 3.1rem);
  line-height: 1.08;
  max-width: 16ch;
}

.hero-copy,
.content-section p,
.project-card p,
.external-card p {
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.68;
}

.btn-glass {
  width: fit-content;
  border-radius: 12px;
  padding: 10px 16px;
  color: var(--button-text);
  text-decoration: none;
  font-weight: 600;
  background-image: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-color: transparent;
  box-shadow: 0 7px 20px color-mix(in oklab, var(--accent), transparent 75%);
  transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-glass:hover,
.btn-glass:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 10px 26px color-mix(in oklab, var(--accent), transparent 68%);
}

.content-section {
  display: grid;
  gap: 10px;
}

.info-grid {
  display: grid;
  gap: 10px;
  margin-top: 8px;
}

.info-card {
  border-radius: 16px;
  padding: 14px;
  display: grid;
  gap: 8px;
}

.info-card h3 {
  margin: 0;
  font-size: 1.05rem;
}

.content-section h2 {
  margin: 0;
  font-size: clamp(1.2rem, 4vw, 1.8rem);
}

.project-grid {
  display: grid;
  gap: 10px;
  margin-top: 6px;
}

.project-card,
.external-card {
  border-radius: 16px;
  padding: 14px;
  display: grid;
  gap: 8px;
}

.project-card h3,
.external-card h3 {
  margin: 0;
  font-size: 1.05rem;
}

.spotlight {
  margin-top: 10px;
  border-radius: 16px;
  padding: 14px;
  display: grid;
  gap: 8px;
}

.spotlight h3 {
  margin: 0;
  font-size: 1.1rem;
}

.site-footer {
  width: min(1120px, 94vw);
  margin: 0 auto 20px;
  padding-block: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.site-footer a {
  color: var(--text-secondary);
  text-decoration: none;
}

.site-footer a:hover,
.site-footer a:focus-visible {
  color: var(--text-primary);
}

@supports not ((backdrop-filter: blur(2px)) or (-webkit-backdrop-filter: blur(2px))) {
  .glass-surface,
  .glass-soft,
  .icon-btn,
  .btn-glass {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: color-mix(in oklab, var(--bg-page), white 12%);
  }
}

@media (min-width: 740px) {
  .header-inner {
    padding: 14px 26px;
  }

  .main-nav {
    display: flex;
  }

  .controls {
    gap: 10px;
  }

  .page-content {
    gap: 20px;
    padding-top: 104px;
  }

  .hero,
  .content-section {
    padding: 28px;
  }

  .project-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
  }

  .info-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

  .external-card {
    max-width: 540px;
  }
}

@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;
  }

  .stars {
    opacity: 0.35;
  }
}