:root {
  --bg: #fdfdfe;
  --text-main: #0f172a;
  --text-dim: #475569;
  --primary: #0271ad;
  --glass-bg: rgba(255, 255, 255, 0.75);
  --glass-border: rgba(15, 23, 42, 0.08);
  --nav-pad: 24px;

  --primary-high: #004d87;
  --text-dim-high: #334155;
  --card-bg-glass: rgba(255, 255, 255, 0.95);
  --border: rgba(15, 23, 42, 0.15);
  --bg-app: #ffffff;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: #030712;
  --text-main: #f8fafc;
  --text-dim: #94a3b8;
  --primary: #38bdf8;
  --glass-bg: rgba(3, 7, 18, 0.75);
  --glass-border: rgba(255, 255, 255, 0.08);

  --primary-high: #7dd3fc;
  --text-dim-high: #cbd5e1;
  --card-bg-glass: rgba(15, 23, 42, 0.85);
  --border: rgba(255, 255, 255, 0.1);
  --bg-app: #0f172a;
  color-scheme: dark;
}

body {
  margin: 0;
  background-color: var(--bg);
  color: var(--text-main);
  font-family: "Plus Jakarta Sans", sans-serif;
  overflow-x: hidden;
  transition: background-color 0.4s ease;
  -webkit-font-smoothing: antialiased;
}

section {
  scroll-margin-top: 100px;
}

/* === Navbar === */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--nav-pad) 0;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: padding, background-color;
}

.navbar.scrolled {
  padding: 12px 0;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
}

.nav-container {
  max-width: 1300px;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 48px;
}
.nav-list {
  display: flex;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  background: none;
  border: none;
  color: var(--text-dim);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: color 0.3s;
  position: relative;
  padding: 8px 0;
}
.nav-item:hover {
  color: var(--primary);
}
.nav-item::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width 0.3s ease;
}
.nav-item:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.theme-toggle {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-main);
  padding: 10px;
  border-radius: 12px;
  cursor: pointer;
  display: flex;
  transition: all 0.3s ease;
}
.theme-toggle:hover {
  background: var(--primary);
  color: white;
  transform: rotate(15deg);
}

.github-cta {
  background: var(--text-main);
  color: var(--bg);
  padding: 10px 20px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 800;
  font-size: 0.75rem;
  transition: all 0.3s ease;
}
.github-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px -10px var(--primary);
}

.logo {
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0;
}
.logo-ring {
  width: 36px;
  height: 36px;
  border: 3.5px solid var(--primary);
  border-radius: 12px;
  transform: rotate(45deg);
  transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.logo:hover .logo-ring {
  transform: rotate(225deg);
}
.logo-main {
  font-weight: 800;
  font-size: 1.4rem;
  color: var(--text-main);
  display: block;
  line-height: 1;
}
.logo-sub {
  color: var(--primary);
  font-size: 0.65rem;
  letter-spacing: 3px;
  font-weight: 800;
  display: block;
  margin-top: 4px;
}

/* === Mobile Menu === */
.mobile-toggle {
  display: none;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  padding: 12px;
  border-radius: 14px;
  cursor: pointer;
  z-index: 1001;
}
.hamburger {
  width: 28px;
  height: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.hamburger span {
  display: block;
  width: 100%;
  height: 3px;
  background: var(--primary);
  border-radius: 10px;
  transition: all 0.4s cubic-bezier(0.68, -0.6, 0.32, 1.6);
}
.hamburger.active .line-top {
  transform: translateY(8.5px) rotate(45deg);
}
.hamburger.active .line-mid {
  opacity: 0;
  transform: translateX(20px);
}
.hamburger.active .line-bot {
  transform: translateY(-8.5px) rotate(-45deg);
}

.menu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(8px);
  z-index: 998;
  border: none;
  cursor: pointer;
}
.menu-overlay[hidden] {
  display: none;
}

/* === Core UI Components === */
.logo-container {
  margin-bottom: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.logo-container .logo-main {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -1px;
}
.logo-container .logo-sub {
  background-color: #1e293b;
  color: #ffffff;
  padding: 2px 10px;
  font-weight: 900;
  letter-spacing: 2.5px;
  font-size: 0.85rem;
  border-radius: 4px;
  margin-top: 5px;
}

.hero {
  min-height: 80vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}
.gradient-text {
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 24px;
  background: linear-gradient(
    135deg,
    var(--text-main) 30%,
    var(--primary-high) 100%
  );
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--text-main);
}
.hero-desc {
  color: var(--text-dim-high);
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  max-width: 800px;
  margin: 0 auto 40px;
}

.badges {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}
.high-contrast-badge {
  background: var(--primary-high);
  color: #ffffff;
  padding: 8px 18px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 700;
}
.high-badge-outline {
  border: 2px solid var(--primary-high);
  color: var(--primary-high);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 700;
}

.section-container {
  max-width: 1200px;
  margin: 120px auto;
  padding: 0 24px;
  contain: layout;
}
.section-header {
  text-align: center;
  margin-bottom: 60px;
}
.section-title {
  font-size: clamp(2rem, 5vw, 2.8rem);
  color: var(--text-main);
  margin-bottom: 12px;
  font-weight: 800;
}
.section-subtitle {
  color: var(--text-dim-high);
  font-size: 1.1rem;
}

.presentation-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 40px;
  align-items: start;
}
.image-container {
  background: var(--card-bg-glass);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 20px;
  backdrop-filter: blur(10px);
}
.img-wrapper {
  border-radius: 16px;
  overflow: hidden;
  margin: 0;
  background: #f1f5f9;
  display: flex;
  flex-direction: column;
}
.hardware-img {
  width: 100%;
  height: auto;
  aspect-ratio: 16/10;
  object-fit: cover;
}
.caption {
  padding: 15px;
  color: var(--text-dim-high);
  text-align: center;
  font-size: 0.9rem;
  font-weight: 600;
  border-top: 1px solid var(--border);
}

.specs-card {
  background: var(--card-bg-glass);
  padding: 40px;
  border-radius: 24px;
  border: 1px solid var(--border);
  backdrop-filter: blur(10px);
}
.text-primary-high {
  color: var(--primary-high);
  font-size: 1.15rem;
  display: block;
  margin-bottom: 5px;
  font-weight: 800;
}
.spec-item p {
  color: var(--text-dim-high);
  margin-bottom: 25px;
  line-height: 1.6;
}

.modern-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}
.modern-card-link {
  text-decoration: none;
  color: inherit;
  display: block;
}
.modern-card {
  background: var(--card-bg-glass);
  border: 1px solid var(--border);
  border-radius: 24px;
  backdrop-filter: blur(12px);
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  height: 100%;
  display: flex;
  flex-direction: column;
}
.interactive:hover {
  transform: translateY(-8px);
  border-color: var(--primary-high);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.08);
}
.card-content {
  padding: 32px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}
.card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}
.modern-icon {
  font-size: 1.8rem;
}
.tech-pill-high {
  background: rgba(1, 87, 155, 0.05);
  color: var(--primary-high);
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.75rem;
  font-weight: 800;
  border: 1.5px solid var(--primary-high);
}
.primary-pill {
  background: var(--primary-high) !important;
  color: #ffffff !important;
  border: none !important;
}
.featured-card {
  border: 2px solid var(--primary-high);
}
.modern-card h3 {
  color: var(--text-main);
  margin: 10px 0;
  font-size: 1.4rem;
  font-weight: 700;
}
.modern-card p {
  color: var(--text-dim-high);
  line-height: 1.6;
  font-size: 0.95rem;
  margin-bottom: 20px;
}
.card-footer-high {
  margin-top: auto;
  color: var(--primary-high);
  font-weight: 800;
  font-size: 0.9rem;
}

footer {
  padding: 100px 24px;
  text-align: center;
  border-top: 1px solid var(--border);
  color: var(--text-main);
  font-size: 1rem;
}

/* === Scroll Animations (Replaces Svelte in:fly/fade) === */
.animate-fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity 0.8s ease-out,
    transform 0.8s ease-out;
  will-change: opacity, transform;
}
.animate-fade-right {
  opacity: 0;
  transform: translateX(-30px);
  transition:
    opacity 1s ease-out,
    transform 1s ease-out;
  will-change: opacity, transform;
}
.animate-fade-left {
  opacity: 0;
  transform: translateX(30px);
  transition:
    opacity 1s ease-out,
    transform 1s ease-out;
  will-change: opacity, transform;
}

.delay-1 {
  transition-delay: 100ms;
}
.delay-2 {
  transition-delay: 200ms;
}
.delay-3 {
  transition-delay: 300ms;
}

.is-visible {
  opacity: 1 !important;
  transform: translate(0) !important;
}

/* === Media Queries === */
@media (max-width: 1024px) {
  .mobile-toggle {
    display: flex;
  }
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    max-width: 300px;
    height: 100vh;
    background: var(--bg);
    flex-direction: column;
    justify-content: center;
    padding: 40px;
    transition: right 0.5s ease;
    border-left: 1px solid var(--glass-border);
    visibility: hidden;
  }
  .nav-links.open {
    right: 0;
    visibility: visible;
  }
  .nav-list {
    flex-direction: column;
    gap: 40px;
    align-items: center;
  }
  .nav-actions {
    flex-direction: column;
    width: 100%;
    gap: 20px;
  }
}
@media (max-width: 900px) {
  .presentation-grid {
    grid-template-columns: 1fr;
  }
  .section-container {
    margin: 80px auto;
  }
}