:root {
  --bg: #0f172a;
  --bg-deep: #020617;
  --panel: #111827;
  --panel-light: #1f2937;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent-soft: rgba(56, 189, 248, 0.15);
  --border: #334155;
  --shadow: rgba(0, 0, 0, 0.28);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  font-size: 18px;
  line-height: 1.6;
  background: linear-gradient(180deg, var(--bg-deep) 0%, var(--bg) 100%);
  color: var(--text);
}

img,
video,
iframe {
  display: block;
  max-width: 100%;
}

.site-shell {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  padding: 2.5rem 1.5rem;
  border-right: 1px solid var(--border);
  background: rgba(2, 6, 23, 0.92);
  backdrop-filter: blur(12px);
}

.sidebar h1 {
  margin: 0 0 0.75rem;
  font-size: 1.95rem;
  line-height: 1.15;
}

.tagline {
  margin: 0 0 2rem;
  color: var(--muted);
  line-height: 1.6;
  font-size: 1.1rem;
}

.nav {
  display: grid;
  gap: 0.85rem;
}

.nav-button {
  width: 100%;
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 0.85rem;
  background: var(--panel);
  color: var(--text);
  text-align: left;
  font-size: 0.98rem;
  line-height: 1.4;
  cursor: pointer;
  transition:
    transform 0.15s ease,
    border-color 0.15s ease,
    background 0.15s ease;
}

.nav-button:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  background: var(--panel-light);
}

.content {
  min-width: 0;
  width: 100%;
  padding: 3rem 3.5rem;
}

.page {
  width: 100%;
  padding: 3rem;
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: rgba(17, 24, 39, 0.82);
  box-shadow: 0 20px 50px var(--shadow);
}

.page h2 {
  margin: 0 0 1.25rem;
  font-size: 2.4rem;
  line-height: 1.15;
}

.page h3 {
  margin: 0 0 0.9rem;
  font-size: 1.35rem;
  line-height: 1.3;
}

.page p {
  margin: 0 0 1.25rem;
  font-size: 1.08rem;
  line-height: 1.85;
  color: #dbe4ee;
}

.page ul,
.page ol {
  margin: 0 0 1.5rem;
  padding-left: 1.4rem;
}

.page li {
  margin-bottom: 1rem;
  line-height: 1.8;
}

.section {
  margin-top: 2.5rem;
}

.section:first-child {
  margin-top: 0;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.card {
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  background: linear-gradient(
    180deg,
    rgba(31, 41, 55, 0.95) 0%,
    rgba(17, 24, 39, 0.95) 100%
  );
}

.card h3 {
  margin: 0 0 0.75rem;
}

.card p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.75;
}

.muted {
  color: var(--muted);
}

.source-list,
.log-list {
  margin: 0;
  padding-left: 1.35rem;
}

.source-list li,
.log-list li {
  margin-bottom: 1.25rem;
  line-height: 1.85;
}

.highlight-box {
  margin-top: 1.75rem;
  padding: 1.1rem 1.25rem;
  border-radius: 0.75rem;
  background: var(--accent-soft);
  line-height: 1.8;
}

.page-image {
  width: 100%;
  max-width: 700px;
  display: block;
  margin: 1.5rem auto;
  border-radius: 0.75rem;
  border: 1px solid var(--border);
  background: #0b1220;
}

a {
  color: var(--accent);
}

@media (max-width: 1100px) {
  .content {
    padding: 2rem;
  }

  .page {
    padding: 2.25rem;
  }
}

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

  .sidebar {
    position: static;
    height: auto;
    overflow: visible;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .content {
    padding: 1.5rem;
  }

  .page {
    padding: 2rem;
  }

  .page h2 {
    font-size: 2rem;
  }
}

@media (max-width: 600px) {
  body {
    font-size: 16px;
  }

  .sidebar {
    padding: 1.5rem 1rem;
  }

  .content {
    padding: 1rem;
  }

  .page {
    padding: 1.35rem;
    border-radius: 0.85rem;
  }

  .page h2 {
    font-size: 1.75rem;
  }

  .page h3 {
    font-size: 1.2rem;
  }

  .page p {
    font-size: 1rem;
    line-height: 1.75;
  }

  .nav-button {
    padding: 0.9rem 1rem;
  }
}