:root {
  --bg: #f5efe3;
  --bg-accent: #dcecff;
  --panel: rgba(255, 252, 247, 0.82);
  --panel-strong: rgba(255, 255, 255, 0.92);
  --line: rgba(18, 32, 51, 0.12);
  --line-strong: rgba(18, 32, 51, 0.2);
  --text: #122033;
  --muted: #586578;
  --accent: #0f766e;
  --accent-soft: #e1f5f2;
  --warm: #f59e0b;
  --code-bg: #0e1726;
  --code-text: #f4f8ff;
  --shadow: 0 28px 60px rgba(18, 32, 51, 0.12);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  background:
    radial-gradient(
      circle at top left,
      rgba(245, 158, 11, 0.18),
      transparent 30%
    ),
    radial-gradient(
      circle at top right,
      rgba(15, 118, 110, 0.14),
      transparent 26%
    ),
    linear-gradient(135deg, var(--bg) 0%, var(--bg-accent) 100%);
}

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

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

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 1.5rem;
  border-right: 1px solid var(--line);
  background: rgba(18, 32, 51, 0.9);
  color: #f8fafc;
  backdrop-filter: blur(16px);
}

.brand {
  display: flex;
  gap: 0.9rem;
  align-items: center;
  color: inherit;
  text-decoration: none;
  margin-bottom: 2rem;
}

.brand-mark {
  width: 3rem;
  height: 3rem;
  display: grid;
  place-items: center;
  border-radius: 18px;
  background: linear-gradient(135deg, #f59e0b, #f97316);
  color: #0f172a;
  font-weight: 700;
}

.brand strong,
.topbar h1,
.content-card h1,
.content-card h2,
.content-card h3 {
  font-family: "Literata", Georgia, serif;
}

.brand small {
  display: block;
  margin-top: 0.2rem;
  color: rgba(248, 250, 252, 0.7);
}

.sidebar-nav {
  display: grid;
  gap: 0.35rem;
}

.sidebar-nav a {
  padding: 0.75rem 0.9rem;
  border-radius: 12px;
  color: rgba(248, 250, 252, 0.84);
  text-decoration: none;
  transition:
    background 0.18s ease,
    color 0.18s ease,
    transform 0.18s ease;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
  transform: translateX(2px);
}

.content-shell {
  padding: 2rem;
}

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.eyebrow {
  margin: 0 0 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.74rem;
  color: var(--muted);
}

.topbar h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.4rem);
}

.language-switcher {
  display: inline-flex;
  gap: 0.35rem;
  padding: 0.35rem;
  background: rgba(255, 255, 255, 0.56);
  border: 1px solid var(--line);
  border-radius: 999px;
  backdrop-filter: blur(16px);
}

.language-switcher a {
  min-width: 3rem;
  padding: 0.55rem 0.8rem;
  border-radius: 999px;
  text-align: center;
  text-decoration: none;
  color: var(--muted);
}

.language-switcher a.active {
  background: var(--text);
  color: #fff;
}

.content-card {
  max-width: 980px;
  padding: 2rem clamp(1.2rem, 2vw, 2.4rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.content-card > :first-child {
  margin-top: 0;
}

.content-card p,
.content-card li {
  color: var(--text);
  line-height: 1.75;
}

.content-card ul,
.content-card ol {
  padding-left: 1.3rem;
}

.content-card blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.2rem;
  border-left: 4px solid var(--warm);
  background: rgba(245, 158, 11, 0.08);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.content-card code,
.content-card pre {
  font-family: "SFMono-Regular", Consolas, monospace;
}

.content-card :not(pre) > code {
  padding: 0.12rem 0.4rem;
  border-radius: 8px;
  background: rgba(15, 118, 110, 0.1);
  color: #0f5f58;
}

.content-card pre {
  overflow-x: auto;
  padding: 1rem 1.1rem;
  border-radius: var(--radius-md);
  background: var(--code-bg);
  color: var(--code-text);
}

.content-card table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--panel-strong);
}

.content-card th,
.content-card td {
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.content-card th {
  background: rgba(18, 32, 51, 0.06);
}

.hero-grid,
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1.6rem 0 0.4rem;
}

.hero-card,
.info-card {
  padding: 1.2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.78);
}

.hero-card h3,
.info-card h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.hero-card p,
.info-card p {
  margin-bottom: 0;
}

.download-note {
  margin-top: 1.5rem;
  padding: 1rem 1.2rem;
  border-radius: var(--radius-md);
  background: var(--accent-soft);
  border: 1px solid rgba(15, 118, 110, 0.16);
}

.footer {
  max-width: 980px;
  margin-top: 1rem;
  padding: 0.2rem 0.4rem;
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 1040px) {
  .page-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
}

@media (max-width: 720px) {
  .content-shell {
    padding: 1rem;
  }

  .topbar {
    flex-direction: column;
  }

  .content-card {
    padding: 1.25rem;
    border-radius: 20px;
  }
}