:root {
  --bg: #05060a;
  --bg-soft: #0b0d13;
  --accent: #4b82ff;
  --accent-soft: rgba(75, 130, 255, 0.2);
  --text-main: #f5f5f7;
  --text-muted: #9a9ba5;
  --border-subtle: #1a1c24;
  --radius-lg: 14px;
  --radius-pill: 999px;
  --shadow-soft: 0 24px 60px rgba(0, 0, 0, 0.6);
  --transition-fast: 160ms ease-out;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
}

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

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: var(--font-sans);
  background: radial-gradient(circle at top, #151827 0, #05060a 55%);
  color: var(--text-main);
  -webkit-font-smoothing: antialiased;
}

/* Subtle background glow */
.bg-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 20% -10%, rgba(75, 130, 255, 0.35), transparent 55%),
    radial-gradient(circle at 80% 110%, rgba(111, 255, 197, 0.18), transparent 55%);
  mix-blend-mode: screen;
  opacity: 0.8;
  z-index: -1;
}

/* Top bar */

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 7vw;
  backdrop-filter: blur(22px);
  background: linear-gradient(
    to bottom,
    rgba(5, 6, 10, 0.9),
    rgba(5, 6, 10, 0.4),
    transparent
  );
  border-bottom: 1px solid rgba(26, 28, 36, 0.7);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-dot {
  width: 16px;
  height: 16px;
  border-radius: 999px;
  background: radial-gradient(circle at 30% 30%, #ffffff, #4b82ff);
  box-shadow: 0 0 16px rgba(75, 130, 255, 0.9);
}

.brand-name {
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.topbar-nav {
  display: flex;
  gap: 18px;
  font-size: 0.85rem;
}

.topbar-nav a {
  text-decoration: none;
  color: var(--text-muted);
  padding: 6px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast),
    background var(--transition-fast), transform var(--transition-fast);
}

.topbar-nav a:hover {
  color: var(--text-main);
  border-color: rgba(75, 130, 255, 0.5);
  background: rgba(11, 13, 19, 0.9);
  transform: translateY(-1px);
}

/* Layout */

.main {
  max-width: 820px;
  margin: 0 auto;
  padding: 48px 16px 32px;
}

.hero {
  text-align: left;
  margin-bottom: 32px;
}

.hero h1 {
  font-size: clamp(2.4rem, 4vw, 3.2rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 8px;
}

.subtitle {
  margin: 0;
  max-width: 480px;
  color: var(--text-muted);
  font-size: 0.98rem;
}

/* Links grid */

.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 32px;
}

.link-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  border-radius: var(--radius-lg);
  background: radial-gradient(circle at top left, #202335, #0b0d13);
  border: 1px solid var(--border-subtle);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.7);
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
  transition: transform 160ms ease-out, box-shadow 160ms ease-out,
    border-color 160ms ease-out, background-position 160ms ease-out;
  background-size: 180% 180%;
  background-position: 0% 0%;
}

.link-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    transparent 0%,
    rgba(75, 130, 255, 0.16) 40%,
    transparent 90%
  );
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.link-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 26px 52px rgba(0, 0, 0, 0.9);
  border-color: rgba(75, 130, 255, 0.7);
  background-position: 100% 100%;
}

.link-card:hover::after {
  opacity: 1;
}

.link-title {
  font-weight: 600;
  font-size: 0.98rem;
}

.link-desc {
  font-size: 0.86rem;
  color: var(--text-muted);
}

/* About */

.about {
  margin-top: 32px;
  padding: 18px 18px 16px;
  border-radius: var(--radius-lg);
  border: 1px dashed rgba(154, 155, 165, 0.45);
  background: rgba(5, 6, 10, 0.7);
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Footer */

.footer {
  max-width: 820px;
  margin: 0 auto 24px;
  padding: 0 16px;
  color: var(--text-muted);
  font-size: 0.8rem;
  text-align: left;
}

/* Small screens */

@media (max-width: 600px) {
  .topbar {
    padding-inline: 16px;
  }

  .topbar-nav {
    gap: 10px;
  }

  .topbar-nav a {
    padding-inline: 8px;
  }
}