*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  color-scheme: dark;
  --bg-base: #0f172a;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --text-strong: #f8fafc;
  --accent-sky: #7dd3fc;
  --accent-violet: #a78bfa;
  --accent-gold: #facc15;
  --panel: rgba(15, 23, 42, 0.72);
  --panel-border: rgba(255, 255, 255, 0.09);
  --radius: 16px;
  --max-width: 1120px;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background:
    radial-gradient(ellipse 80% 50% at 15% -10%, rgba(56, 189, 248, 0.28), transparent 55%),
    radial-gradient(ellipse 70% 45% at 90% 110%, rgba(167, 139, 250, 0.22), transparent 50%),
    linear-gradient(160deg, var(--bg-base) 0%, #1e1b4b 48%, #0c4a6e 100%);
}

a {
  color: var(--accent-sky);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  width: min(100% - 2rem, var(--max-width));
  margin-inline: auto;
}

/* Brand */
.brand {
  font-family: 'Orbitron', 'Segoe UI', system-ui, sans-serif;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  background: linear-gradient(135deg, #f1f5f9 0%, var(--accent-sky) 50%, var(--accent-violet) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(12px);
  background: rgba(15, 23, 42, 0.65);
  border-bottom: 1px solid var(--panel-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
}

.site-header__brand:hover {
  text-decoration: none;
}

.site-header__logo {
  width: 36px;
  height: 36px;
}

.site-header__name {
  font-size: 1.05rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.site-nav a {
  color: var(--text-muted);
  font-size: 0.9rem;
  text-decoration: none;
  transition: color 0.15s;
}

.site-nav a:hover {
  color: var(--text-strong);
  text-decoration: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.35rem;
  border-radius: 12px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn--primary {
  background: linear-gradient(135deg, #facc15 0%, #f59e0b 100%);
  color: #0b101a;
  box-shadow: 0 4px 24px rgba(250, 204, 21, 0.35);
}

.btn--primary:hover {
  box-shadow: 0 6px 28px rgba(250, 204, 21, 0.45);
}

.btn--ghost {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-strong);
  border: 1px solid var(--panel-border);
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.1);
}

.btn--large {
  padding: 0.9rem 1.75rem;
  font-size: 1.05rem;
  border-radius: 14px;
}

/* Hero */
.hero {
  padding: 4.5rem 0 5rem;
  text-align: center;
}

.hero__badge {
  display: inline-block;
  margin-bottom: 1.25rem;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--accent-sky);
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(125, 211, 252, 0.25);
}

.hero__title {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--text-strong);
  letter-spacing: -0.02em;
}

.hero__title span {
  background: linear-gradient(135deg, var(--accent-sky), var(--accent-violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__lead {
  margin: 0 auto 2rem;
  max-width: 36rem;
  font-size: clamp(1.05rem, 2.5vw, 1.25rem);
  color: var(--text-muted);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  justify-content: center;
}

.hero__visual {
  margin: 3rem auto 0;
  max-width: 720px;
  padding: 1.5rem;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.hero__mock {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 0.75rem;
  min-height: 200px;
  border-radius: 12px;
  overflow: hidden;
  background: rgba(0, 0, 0, 0.25);
}

.hero__mock-rail {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 0;
  background: rgba(255, 255, 255, 0.03);
}

.hero__mock-dot {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, #334155, #1e1b4b);
}

.hero__mock-dot--active {
  box-shadow: 0 0 0 2px var(--accent-sky);
}

.hero__mock-main {
  padding: 1rem 1.25rem;
  text-align: left;
}

.hero__mock-line {
  height: 10px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.08);
  margin-bottom: 0.6rem;
}

.hero__mock-line--short {
  width: 45%;
}

.hero__mock-line--accent {
  width: 70%;
  background: linear-gradient(90deg, rgba(125, 211, 252, 0.35), transparent);
}

/* Sections */
.section {
  padding: 4rem 0;
}

.section__label {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-violet);
}

.section__title {
  margin: 0 0 0.75rem;
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  color: var(--text-strong);
}

.section__lead {
  margin: 0 0 2.5rem;
  max-width: 32rem;
  color: var(--text-muted);
}

/* Features grid */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.feature-card {
  padding: 1.5rem;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  transition: border-color 0.2s, transform 0.2s;
}

.feature-card:hover {
  border-color: rgba(125, 211, 252, 0.25);
  transform: translateY(-2px);
}

.feature-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin-bottom: 1rem;
  border-radius: 12px;
  font-size: 1.35rem;
  background: rgba(56, 189, 248, 0.12);
}

.feature-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  color: var(--text-strong);
}

.feature-card p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* Download */
.download {
  padding: 4rem 0 5rem;
}

.download-card {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 2rem 2.25rem;
  border-radius: calc(var(--radius) + 4px);
  background:
    linear-gradient(135deg, rgba(56, 189, 248, 0.08), rgba(167, 139, 250, 0.08)),
    var(--panel);
  border: 1px solid var(--panel-border);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

.download-card__meta {
  flex: 1 1 280px;
}

.download-card__version {
  display: inline-block;
  margin-bottom: 0.75rem;
  padding: 0.25rem 0.65rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-gold);
  background: rgba(250, 204, 21, 0.12);
}

.download-card h2 {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
  color: var(--text-strong);
}

.download-card p {
  margin: 0;
  color: var(--text-muted);
}

.download-card__actions {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  align-items: flex-start;
}

.download-card__status {
  margin: 0;
  font-size: 0.85rem;
  color: #fca5a5;
}

.btn--disabled {
  pointer-events: none;
  opacity: 0.55;
  cursor: not-allowed;
}

.btn--disabled:hover {
  transform: none;
  box-shadow: 0 4px 24px rgba(250, 204, 21, 0.35);
}

/* Footer */
.site-footer {
  padding: 2rem 0 2.5rem;
  border-top: 1px solid var(--panel-border);
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Mobile nav */
.menu-toggle {
  display: none;
  padding: 0.4rem;
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
}

@media (max-width: 640px) {
  .menu-toggle {
    display: block;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    padding: 1rem;
    background: rgba(15, 23, 42, 0.95);
    border-bottom: 1px solid var(--panel-border);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-header__inner {
    position: relative;
    flex-wrap: wrap;
  }

  .hero {
    padding-top: 3rem;
  }

  .download-card {
    padding: 1.5rem;
  }
}