/* ------------------
   Design Tokens
------------------- */
:root {
  /* brand */
  --brand: #0081a7; /* provided */
  --brand-2: #00b4d8; /* accent for gradients */
  --brand-3: #60eaf0; /* subtle glow */

  /* dark surface */
  --bg: #0b0f13; /* page */
  --panel: #0f141a; /* cards / sidebar */
  --muted: #131a22; /* subsection */
  --elev: #151d26; /* elevated */

  /* text */
  --text: #e5e7eb;
  --text-dim: #a8b3bf;
  --text-mute: #7a8a9a;

  /* borders & shadows */
  --line: 1px solid rgba(255, 255, 255, 0.06);
  --shadow-1: 0 10px 30px rgba(0, 0, 0, 0.45);
  --ring: 0 0 0 3px rgba(0, 129, 167, 0.25);

  /* code */
  --code-bg: #0a0e12;
  --code-br: 1px solid rgba(255, 255, 255, 0.07);
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;

  /* radii & spacing */
  --r: 14px;
  --r-sm: 10px;
  --pad: 18px;

  /* layout sizes */
  --topbar-h: 64px;
  --sidebar-w: 280px;
  --content-max: 1020px;
}

@media (prefers-color-scheme: light) {
  :root {
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica,
    Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(
      1200px 800px at 10% -10%,
      rgba(0, 180, 216, 0.12),
      transparent 60%
    ),
    radial-gradient(
      1000px 700px at 90% 10%,
      rgba(96, 234, 240, 0.1),
      transparent 60%
    ),
    var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/**************
 * Anchors: prevent headings from hiding under the topbar
 **************/
h1,
h2,
h3,
h4,
h5 {
  scroll-margin-top: calc(var(--topbar-h) + 18px);
}

a {
  color: inherit;
  text-decoration: none;
}
code,
pre {
  font-family: var(--mono);
}

/* --------------
   Layout Shell
--------------- */
.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  grid-template-rows: var(--topbar-h) 1fr;
  grid-template-areas: "side top" "side main";
  min-height: 100svh; /* svh for mobile viewport correctness */
  position: relative;
}

/* Topbar */
.topbar {
  grid-area: top;
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 12px;
  justify-content: space-between;
  padding: 0 16px;
  backdrop-filter: saturate(140%) blur(8px);
  background: linear-gradient(
    180deg,
    rgba(15, 20, 26, 0.75),
    rgba(15, 20, 26, 0.55)
  );
  border-bottom: var(--line);
  height: var(--topbar-h);
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand img {
  height: 34px;
  width: auto;
  object-fit: contain;
}
.brand .title {
  font-weight: 700;
  letter-spacing: 0.2px;
  white-space: nowrap;
}

.actions {
  display: flex;
  gap: 8px;
  align-items: center;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 36px;
  padding: 0 12px;
  border-radius: 9px;
  background: var(--muted);
  border: var(--line);
  color: var(--text);
  box-shadow: var(--shadow-1);
}
.btn.primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #041015;
  border: none;
  font-weight: 600;
}
.btn:focus-visible {
  outline: none;
  box-shadow: var(--ring);
}

/* Sidebar */
.sidebar {
  grid-area: side;
  position: sticky;
  top: 0;
  align-self: start;
  height: 100svh;
  border-right: var(--line);
  background: linear-gradient(
    180deg,
    rgba(19, 26, 34, 0.9),
    rgba(15, 20, 26, 0.92)
  );
  padding: 18px;
  overflow: auto;
}

.nav-group {
  margin-bottom: 22px;
}
.nav-label {
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-mute);
  margin-bottom: 10px;
  display: block;
}
.nav {
  display: grid;
  gap: 6px;
}
.nav a {
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--text-dim);
  border: 1px solid transparent;
  display: flex;
  align-items: center;
  gap: 10px;
}
.nav a:hover {
  background: rgba(0, 0, 0, 0.25);
  border-color: rgba(255, 255, 255, 0.06);
  color: var(--text);
}
.nav a.active {
  background: linear-gradient(
    135deg,
    rgba(0, 129, 167, 0.28),
    rgba(0, 180, 216, 0.14)
  );
  color: #eafcff;
  border-color: rgba(96, 234, 240, 0.25);
}

/* Main */
.main {
  grid-area: main;
  padding: 28px clamp(16px, 4vw, 40px) 80px;
  max-width: var(--content-max);
  width: 100%;
}

/* --------------
   Content
--------------- */
.hero {
  background: linear-gradient(
    180deg,
    rgba(0, 129, 167, 0.14),
    rgba(0, 0, 0, 0)
  );
  border: var(--line);
  border-radius: var(--r);
  padding: 28px;
  margin-bottom: 22px;
  position: relative;
  overflow: hidden;
}
.hero:after {
  content: "";
  position: absolute;
  inset: -60px -60px auto auto;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(
    closest-side,
    rgba(96, 234, 240, 0.18),
    transparent
  );
  filter: blur(20px);
}

h1 {
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1.15;
  margin: 0 0 10px;
}
.lede {
  color: var(--text-dim);
  font-size: clamp(16px, 2.2vw, 18px);
}

h2 {
  margin: 26px 0 8px;
  font-size: clamp(18px, 2.3vw, 24px);
}
p {
  color: var(--text-dim);
  line-height: 1.7;
  margin: 10px 0 14px;
}
ul {
  margin: 8px 0 18px 18px;
  color: var(--text-dim);
}

.card {
  background: var(--panel);
  border: var(--line);
  border-radius: var(--r);
  padding: var(--pad);
  box-shadow: var(--shadow-1);
}
.grid {
  display: grid;
  gap: 16px;
}
.grid.cols-2 {
  grid-template-columns: 1fr 1fr;
}

/* tighten two-column at medium widths to avoid overflow */
@media (max-width: 1200px) {
  .grid.cols-2 {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 960px) {
  .grid.cols-2 {
    grid-template-columns: 1fr;
  }
}

/* code blocks */
pre {
  background: var(--code-bg);
  border: var(--code-br);
  border-radius: var(--r-sm);
  padding: 14px;
  overflow: auto;
  position: relative;
}
pre .copy {
  position: absolute;
  top: 10px;
  right: 10px;
}
kbd {
  background: #10161d;
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 2px 6px;
  border-radius: 6px;
}

/* search */
.search {
  display: flex;
  gap: 8px;
  align-items: center;
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--muted);
  border: var(--line);
  min-width: 220px;
}
.search input {
  flex: 1;
  background: transparent;
  border: 0;
  outline: none;
  color: var(--text);
  font-size: 14px;
}

/* mobile */
.hamburger {
  display: none;
}

/* Overlay when sidebar is open (pure CSS using :has) */
.app:has(.sidebar.open)::after {
  content: "";
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 35;
  backdrop-filter: blur(2px);
}

@media (max-width: 920px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-areas: "top" "main";
  }
  .sidebar {
    position: fixed;
    inset: var(--topbar-h) 0 0 auto;
    width: min(88vw, 340px);
    transform: translateX(105%);
    transition: transform 0.26s ease;
    z-index: 40;
    border-left: var(--line);
    border-right: none;
    border-top: var(--line);
    border-bottom: var(--line);
    border-top-left-radius: 18px;
    border-bottom-left-radius: 18px;
    box-shadow: -24px 0 48px rgba(0, 0, 0, 0.35);
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .hamburger {
    display: inline-flex;
  }
  .brand .title {
    display: none;
  }
  .actions .btn.primary {
    height: 34px;
    padding: 0 10px;
  }
  .search {
    min-width: 0;
    width: 42vw;
  }
  .main {
    padding: 20px 16px 56px;
    max-width: 100%;
  }
}

/* small phones */
@media (max-width: 640px) {
  .search kbd {
    display: none;
  }
  .search svg {
    display: none;
  }
  .search {
    width: 50vw;
  }
  .actions {
    gap: 6px;
  }
  .btn {
    height: 34px;
    padding: 0 10px;
  }
}

/* reduce motion for users that prefer it */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* focus styles */
:focus-visible {
  outline: none;
  box-shadow: var(--ring);
  border-radius: 10px;
}

/* footer */
.footer {
  color: var(--text-mute);
  font-size: 12px;
  margin-top: 36px;
  padding-top: 16px;
  border-top: var(--line);
}