@import url("https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,500;9..144,700&family=Source+Sans+3:ital,wght@0,400;0,600;0,700;1,400&family=IBM+Plex+Mono:wght@400;500&display=swap");

:root {
  --brand: #2b5cd9;
  --brand-soft: #7ba3ff;
  --brand-deep: #1a3a9e;
  --ink: #0f172a;
  --ink-muted: #475569;
  --paper: #f4f7fc;
  --surface: rgba(255, 255, 255, 0.78);
  --line: rgba(15, 23, 42, 0.1);
  --code-bg: #0b1220;
  --code-ink: #e2e8f0;
  --ok: #0f766e;
  --warn: #b45309;
  --radius: 14px;
  --shadow: 0 18px 50px rgba(15, 40, 100, 0.08);
  --max: 720px;
  --nav-h: 64px;
  --page-pad: 1.25rem;
  --page-max: 1100px;
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Source Sans 3", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(43, 92, 217, 0.22), transparent 55%),
    radial-gradient(ellipse 60% 40% at 95% 5%, rgba(123, 163, 255, 0.28), transparent 50%),
    radial-gradient(ellipse 50% 35% at 70% 90%, rgba(26, 58, 158, 0.1), transparent 55%),
    linear-gradient(180deg, #eef3fb 0%, var(--paper) 40%, #e8eef8 100%);
  background-attachment: fixed;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--brand-deep);
  text-underline-offset: 0.15em;
}

a:hover {
  color: var(--brand);
}

/* ----- Nav ----- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  min-height: var(--nav-h);
  backdrop-filter: blur(14px);
  background: rgba(244, 247, 252, 0.82);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--page-pad);
  min-height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  margin: 0;
  padding: 0.35rem 0;
  text-decoration: none;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.brand img {
  display: block;
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 10px;
  padding: 0.45rem 0.75rem;
  margin: 0;
  font: inherit;
  line-height: 1;
  cursor: pointer;
  color: var(--ink);
}

.nav-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-links li {
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  color: var(--ink-muted);
  font-weight: 600;
  font-size: 0.92rem;
  line-height: 1;
  padding: 0.5rem 0.7rem;
  border-radius: 8px;
  transition: background 0.2s ease, color 0.2s ease;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--brand-deep);
  background: rgba(43, 92, 217, 0.1);
}

.nav-links .github {
  margin: 0 0 0 0.25rem;
  color: #fff;
  background: var(--ink);
}

.nav-links .github:hover {
  background: var(--brand);
  color: #fff;
}

/* ----- Layout ----- */

main {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 2rem var(--page-pad) 4rem;
}

.prose {
  max-width: var(--max);
}

.prose-wide {
  max-width: 860px;
}

footer.site-footer {
  border-top: 1px solid var(--line);
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 1.75rem var(--page-pad) 2.5rem;
  text-align: center;
  color: var(--ink-muted);
  font-size: 0.95rem;
}

footer.site-footer a {
  font-weight: 600;
  text-decoration: none;
}

/* ----- Hero (landing only) ----- */

.hero {
  position: relative;
  min-height: calc(100vh - var(--nav-h) - 2rem);
  display: grid;
  align-content: center;
  gap: 1.25rem;
  padding: 2.5rem 0 3rem;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 8% -10% auto 35%;
  height: 70%;
  background:
    radial-gradient(circle at 30% 40%, rgba(43, 92, 217, 0.18), transparent 55%),
    radial-gradient(circle at 70% 60%, rgba(123, 163, 255, 0.22), transparent 50%);
  filter: blur(8px);
  pointer-events: none;
  animation: drift 14s ease-in-out infinite alternate;
}

@keyframes drift {
  from {
    transform: translate3d(0, 0, 0) scale(1);
  }
  to {
    transform: translate3d(-3%, 4%, 0) scale(1.05);
  }
}

.hero-brand {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 3.75rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.05;
  margin: 0;
  animation: rise 0.7s ease both;
}

.hero-brand img {
  width: clamp(48px, 8vw, 64px);
  height: clamp(48px, 8vw, 64px);
  border-radius: 16px;
  box-shadow: var(--shadow);
}

.hero h2 {
  position: relative;
  margin: 0;
  max-width: 18ch;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--ink);
  animation: rise 0.7s ease 0.08s both;
}

.hero p.lede {
  position: relative;
  margin: 0;
  max-width: 38ch;
  font-size: 1.15rem;
  color: var(--ink-muted);
  animation: rise 0.7s ease 0.16s both;
}

.cta-row {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.5rem;
  animation: rise 0.7s ease 0.24s both;
}

.keys-banner {
  position: relative;
  max-width: 42rem;
  margin: 0.25rem 0 0;
  padding: 1.05rem 1.2rem 1.15rem;
  background: rgba(15, 118, 110, 0.1);
  border: 1px solid rgba(15, 118, 110, 0.28);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  animation: rise 0.7s ease 0.32s both;
}

.keys-banner h3 {
  margin: 0 0 0.4rem;
  font-size: 1.15rem;
  color: var(--ok);
}

.keys-banner p {
  margin: 0 0 0.85rem;
  color: var(--ink);
  font-size: 1rem;
}

.keys-banner ul {
  margin: 0;
  padding-left: 1.15rem;
}

.keys-banner a {
  font-weight: 700;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.7rem 1.15rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.98rem;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.2s ease, box-shadow 0.2s ease;
}

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

.btn-primary {
  background: var(--brand);
  color: #fff;
  box-shadow: 0 10px 28px rgba(43, 92, 217, 0.28);
}

.btn-primary:hover {
  background: var(--brand-deep);
  color: #fff;
}

.btn-ghost {
  background: var(--surface);
  color: var(--ink);
  border-color: var(--line);
}

.btn-ghost:hover {
  color: var(--brand-deep);
  border-color: rgba(43, 92, 217, 0.35);
}

/* ----- Doc pages ----- */

.page-head {
  margin-bottom: 2rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--line);
}

.page-head h1 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 2.5rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.page-head p {
  margin: 0;
  color: var(--ink-muted);
  font-size: 1.1rem;
  max-width: 52ch;
}

.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 2rem;
  padding: 0;
  list-style: none;
}

.toc a {
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ink-muted);
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--line);
}

.toc a:hover {
  color: var(--brand-deep);
  border-color: rgba(43, 92, 217, 0.3);
}

h2 {
  font-family: var(--font-display);
  font-size: 1.45rem;
  letter-spacing: -0.02em;
  margin: 2.25rem 0 0.75rem;
  scroll-margin-top: calc(var(--nav-h) + 1rem);
}

h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin: 1.75rem 0 0.55rem;
  scroll-margin-top: calc(var(--nav-h) + 1rem);
}

h4 {
  font-family: var(--font-display);
  font-size: 1.02rem;
  margin: 1.35rem 0 0.45rem;
  scroll-margin-top: calc(var(--nav-h) + 1rem);
}

p {
  margin: 0 0 1rem;
}

ul,
ol {
  margin: 0 0 1.15rem;
  padding-left: 1.25rem;
}

li {
  margin-bottom: 0.35rem;
}

li::marker {
  color: var(--brand);
}

strong {
  font-weight: 700;
}

.step {
  counter-increment: step;
  margin: 0 0 1.75rem;
  padding: 1.15rem 1.25rem 1.15rem 1.35rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
  animation: rise 0.5s ease both;
}

.steps {
  counter-reset: step;
}

.step h3 {
  margin-top: 0;
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
}

.step h4 {
  margin-top: 1.25rem;
}

.step h3::before {
  content: counter(step);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.7rem;
  height: 1.7rem;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--brand);
  color: #fff;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 700;
}

.note {
  margin: 1rem 0;
  padding: 0.85rem 1rem;
  border-left: 3px solid var(--brand);
  background: rgba(43, 92, 217, 0.08);
  border-radius: 0 10px 10px 0;
  color: var(--ink);
}

.note.warn {
  border-left-color: var(--warn);
  background: rgba(180, 83, 9, 0.08);
}

.note.ok {
  border-left-color: var(--ok);
  background: rgba(15, 118, 110, 0.08);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.9rem;
  margin: 1.5rem 0 0;
}

.feature-card {
  padding: 1.1rem 1.15rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform 0.2s ease;
}

.feature-card:hover {
  transform: translateY(-2px);
}

.feature-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

.feature-card p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--ink-muted);
}

/* ----- Tables ----- */

.table-wrap {
  overflow-x: auto;
  margin: 0 0 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

th,
td {
  text-align: left;
  padding: 0.7rem 0.9rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

th {
  font-weight: 700;
  background: rgba(43, 92, 217, 0.06);
  white-space: nowrap;
}

tr:last-child td {
  border-bottom: none;
}

code,
kbd {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: rgba(15, 23, 42, 0.06);
  padding: 0.12em 0.35em;
  border-radius: 5px;
}

pre {
  margin: 0 0 1.15rem;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.55;
}

pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

.mermaid {
  margin: 1rem 0 1.5rem;
  padding: 1rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow-x: auto;
}

/* ----- Responsive ----- */

@media (max-width: 820px) {
  .nav-toggle {
    display: inline-flex;
    align-items: center;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    flex-wrap: nowrap;
    justify-content: flex-start;
    gap: 0.2rem;
    margin: 0;
    padding: 0.75rem var(--page-pad) 1rem;
    background: rgba(244, 247, 252, 0.96);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(14px);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links li {
    width: 100%;
  }

  .nav-links a {
    width: 100%;
    padding: 0.7rem 0.75rem;
  }

  .nav-links .github {
    margin: 0.25rem 0 0;
    justify-content: center;
  }

  .hero {
    min-height: auto;
    padding-top: 1.5rem;
  }
}