:root {
  --bg: #000000;
  --bg-soft: #0f0f0f;
  --text: #ffffff;
  --muted: #c8c8c8;
  --primary: #f0f0f0;
  --primary-strong: #d9d9d9;
  --card: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.2);
  --shadow: 0 12px 24px rgba(0, 0, 0, 0.45);
  --radius: 16px;
  --container: 1120px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background-color: var(--bg);
  background-image:
    radial-gradient(circle at 20% 15%, rgba(255, 255, 255, 0.08), transparent 35%),
    radial-gradient(circle at 80% 0%, rgba(255, 255, 255, 0.05), transparent 30%),
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: auto, auto, 32px 32px, 32px 32px;
  background-position: center, center, center, center;
  color: var(--text);
  line-height: 1.6;
}

#particles-bg {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.site-header,
main,
.site-footer {
  position: relative;
  z-index: 1;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.section {
  padding: 5rem 0;
}

.section-title {
  font-size: clamp(1.75rem, 2vw + 1rem, 2.4rem);
  line-height: 1.2;
  margin: 0 0 1rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(12px);
  background: rgba(0, 0, 0, 0.92);
  border-bottom: 1px solid var(--border);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
  letter-spacing: 0.2px;
}

.logo img {
  width: 32px;
  height: 32px;
  object-fit: cover;
  border-radius: 6px;
  transform: translateY(-2px);
}

.logo span {
  color: var(--primary);
}

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

.site-nav a {
  color: var(--muted);
  font-weight: 500;
  transition: color 0.2s ease;
}

.site-nav a:hover {
  color: var(--text);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.06);
  cursor: pointer;
}

.menu-toggle span {
  width: 18px;
  height: 2px;
  margin-inline: auto;
  background: var(--text);
}

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

.eyebrow {
  display: inline-block;
  margin: 0 0 0.75rem;
  color: #d9d9d9;
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw + 1rem, 4rem);
  line-height: 1.08;
}

.lead {
  margin: 1rem 0 0;
  color: var(--muted);
  max-width: 60ch;
}

.hero-actions {
  display: flex;
  gap: 0.8rem;
  margin-top: 1.75rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1rem;
  border-radius: 12px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(130deg, var(--primary), var(--primary-strong));
  color: #000;
}

.btn-ghost {
  border-color: var(--border);
  background: rgba(255, 255, 255, 0.02);
}

.hero-card,
.card,
.about,
.contact {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 1.5rem;
}

.hero-card h2 {
  margin-top: 0;
}

.hero-card ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.hero-card li {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.hero-card strong {
  font-size: 1.25rem;
}

.hero-card span {
  color: var(--muted);
}

.cards {
  margin-top: 1.5rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.card {
  padding: 1.25rem;
}

.card h3 {
  margin-top: 0;
}

.card p,
.about p,
.contact p {
  color: var(--muted);
  margin-bottom: 0;
}

.about,
.contact {
  padding: 1.5rem;
}

.contact-link-line {
  font-family: Consolas, "SFMono-Regular", Menlo, Monaco, monospace;
  font-size: 1rem;
  line-height: 1.5;
  letter-spacing: 0.01em;
  color: var(--text);
  word-break: break-all;
}

.link-validator {
  margin-top: 1.5rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
}

.link-validator h3 {
  margin: 0 0 0.5rem;
}

.validator-form {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.75rem;
  flex-wrap: wrap;
}

.validator-form input {
  flex: 1 1 320px;
  min-width: 220px;
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  font: inherit;
}

.validator-form input::placeholder {
  color: var(--muted);
}

.validator-result {
  margin-top: 0.85rem;
  font-weight: 600;
}

.validator-result.valid {
  color: #9fe89f;
}

.validator-result.invalid {
  color: #ff9d9d;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
}

.footer-wrap {
  min-height: 76px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.back-to-top {
  color: var(--muted);
}

.back-to-top:hover {
  color: var(--text);
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

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

  .cards {
    grid-template-columns: 1fr;
  }

  .menu-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 72px;
    left: 1rem;
    right: 1rem;
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--bg-soft);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
  }

  .site-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }
}