/* agentback.dev — site styles (homepage + docs shell).
   Extends the design language of docs/blog/styles.css:
   paper background, deep green ink, mono accents — plus Fraunces display. */

:root {
  color-scheme: light;
  --bg: #f7f8f5;
  --ink: #17201b;
  --muted: #5a645e;
  --line: #d9ded6;
  --panel: #ffffff;
  --green: #0f6b4f;
  --green-soft: rgba(15, 107, 79, 0.08);
  --cyan: #087b8c;
  --violet: #6d4ca8;
  --amber: #9b6b16;
  --rose: #b43b55;
  --code-bg: #111815;
  --serif: 'Fraunces', Georgia, 'Times New Roman', serif;
  --sans: 'Inter', ui-sans-serif, system-ui, -apple-system, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(
      1100px 480px at 85% -120px,
      rgba(15, 107, 79, 0.1),
      transparent 70%
    ),
    linear-gradient(180deg, rgba(15, 107, 79, 0.05), transparent 420px),
    var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--green);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

code {
  font-family: var(--mono);
}

/* ---------- header ---------- */

.site-header {
  backdrop-filter: blur(12px);
  background: rgba(247, 248, 245, 0.88);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
}

.nav {
  align-items: center;
  display: flex;
  gap: 24px;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 1160px;
  min-height: 64px;
  padding: 0 24px;
}

.brand {
  align-items: center;
  color: var(--ink);
  display: inline-flex;
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 640;
  text-decoration: none;
}

.brand-mark {
  height: 21px;
  margin-right: 9px;
  width: auto;
}

.brand-dot {
  color: var(--green);
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 400;
}

.nav-links {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
}

.nav-links a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 550;
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--green);
}

.nav-gh {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 14px;
}

/* ---------- shared layout ---------- */

main {
  margin: 0 auto;
  max-width: 1160px;
  padding: 0 24px 80px;
}

.eyebrow {
  color: var(--green);
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.1em;
  margin: 0 0 14px;
  text-transform: uppercase;
}

h1,
h2 {
  font-family: var(--serif);
  font-weight: 560;
  letter-spacing: -0.01em;
  line-height: 1.06;
}

h1 {
  font-size: clamp(44px, 6.4vw, 84px);
  margin: 0 0 22px;
}

h1 em,
h2 em {
  color: var(--green);
  font-style: italic;
}

h2 {
  font-size: clamp(28px, 3.6vw, 44px);
  margin: 0 0 14px;
}

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

.lede {
  color: var(--muted);
  font-size: clamp(17px, 1.8vw, 20px);
  margin: 0;
  max-width: 560px;
}

.lede strong {
  color: var(--ink);
}

.section-head {
  align-items: end;
  display: flex;
  gap: 24px;
  justify-content: space-between;
  margin-bottom: 28px;
}

.section-head p {
  margin: 0;
  max-width: 460px;
}

section {
  border-top: 1px dashed var(--line);
  padding: 72px 0;
}

section.hero {
  border-top: none;
}

/* ---------- buttons ---------- */

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  align-items: center;
  background: var(--ink);
  border: 1px solid var(--ink);
  border-radius: 8px;
  color: #fff;
  display: inline-flex;
  font-size: 14px;
  font-weight: 700;
  min-height: 44px;
  padding: 0 18px;
  text-decoration: none;
  transition:
    background 0.15s ease,
    border-color 0.15s ease;
}

.button.secondary {
  background: transparent;
  color: var(--ink);
  font-family: var(--mono);
  font-weight: 600;
}

.button:hover {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
}

/* ---------- hero ---------- */

.hero {
  align-items: center;
  display: grid;
  gap: 56px;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 560px);
  padding: 84px 0 88px;
}

.hero-status {
  align-items: center;
  color: var(--muted);
  display: flex;
  font-family: var(--mono);
  font-size: 12.5px;
  gap: 8px;
  margin: 26px 0 0;
}

.status-dot {
  animation: pulse 2.4s ease-in-out infinite;
  background: var(--green);
  border-radius: 50%;
  display: inline-block;
  height: 8px;
  width: 8px;
}

@keyframes pulse {
  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(15, 107, 79, 0.4);
  }
  50% {
    box-shadow: 0 0 0 6px rgba(15, 107, 79, 0);
  }
}

/* staggered load reveal */
.reveal {
  animation: rise 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.reveal.d1 {
  animation-delay: 0.08s;
}

.reveal.d2 {
  animation-delay: 0.16s;
}

.reveal.d3 {
  animation-delay: 0.26s;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .reveal,
  .status-dot {
    animation: none;
  }
}

/* ---------- code panels ---------- */

.hero-code {
  background: var(--code-bg);
  border: 1px solid #243029;
  border-radius: 12px;
  box-shadow:
    0 24px 48px -24px rgba(17, 24, 21, 0.45),
    0 2px 8px rgba(17, 24, 21, 0.12);
  margin: 0;
  overflow: hidden;
}

.hero-code figcaption {
  align-items: center;
  border-bottom: 1px solid #243029;
  color: #7d8d84;
  display: flex;
  font-family: var(--mono);
  font-size: 12px;
  gap: 7px;
  padding: 12px 16px;
}

.hero-code .filename {
  margin-left: 8px;
}

.dot {
  border-radius: 50%;
  display: inline-block;
  height: 10px;
  width: 10px;
}

.dot.r {
  background: #e0604f;
}

.dot.a {
  background: #d9a13c;
}

.dot.g {
  background: #4caf7d;
}

.hero-code pre {
  margin: 0;
  overflow-x: auto;
  padding: 20px 22px;
}

.hero-code code {
  color: #d8f3e5;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.7;
}

.hero-code .kw {
  color: #8ab8ff;
}

.hero-code .ty {
  color: #ffd483;
}

.hero-code .dec {
  color: #79e2b6;
}

.hero-code .str {
  color: #f5a8b8;
}

.hero-code .num {
  color: #f5a8b8;
}

.hero-code .fn {
  color: #c9b8ff;
}

.hero-code .cm {
  color: #6f7f76;
}

/* ---------- fan-out ---------- */

.fanout {
  display: grid;
  gap: 48px;
  grid-template-columns: minmax(280px, 420px) minmax(0, 1fr);
}

.fanout .thread {
  border-bottom: 3px solid var(--green);
  font-style: italic;
}

.fanout-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  list-style: none;
  margin: 0;
  padding: 0;
}

.fanout-grid li {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 4px solid var(--green);
  border-radius: 8px;
  padding: 16px 18px;
  transition:
    transform 0.15s ease,
    border-color 0.15s ease;
}

.fanout-grid li:hover {
  border-left-color: var(--cyan);
  transform: translateY(-2px);
}

.fanout-grid li:nth-child(2) {
  border-left-color: var(--cyan);
}

.fanout-grid li:nth-child(3) {
  border-left-color: var(--violet);
}

.fanout-grid li:nth-child(4) {
  border-left-color: var(--amber);
}

.fanout-grid li:nth-child(5) {
  border-left-color: var(--rose);
}

.fanout-grid li:nth-child(6) {
  border-left-color: var(--cyan);
}

.fanout-grid strong {
  display: block;
  font-size: 15px;
}

.fanout-grid span {
  color: var(--muted);
  display: block;
  font-size: 13.5px;
  margin-top: 3px;
}

/* ---------- comparison table ---------- */

.table-wrap {
  overflow-x: auto;
}

.compare table,
.doc-content table {
  background: var(--panel);
  border: 1px solid var(--line);
  border-collapse: separate;
  border-radius: 10px;
  border-spacing: 0;
  min-width: 640px;
  width: 100%;
}

.compare th,
.compare td,
.doc-content th,
.doc-content td {
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
  padding: 13px 18px;
  text-align: left;
}

.compare th,
.doc-content th {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.compare tr:last-child td,
.doc-content tr:last-child td {
  border-bottom: none;
}

.compare td:first-child {
  font-weight: 700;
}

.compare tr.hl td {
  background: var(--green-soft);
  color: var(--green);
  font-weight: 700;
}

/* ---------- features ---------- */

.feature-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.feature-grid article {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  padding: 22px;
  transition: border-color 0.15s ease;
}

.feature-grid article:hover {
  border-color: var(--green);
}

.feature-grid h3 {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 640;
  margin: 0 0 10px;
}

.feature-grid p {
  color: var(--muted);
  font-size: 14px;
  margin: 0 0 16px;
}

.feature-grid code {
  background: var(--green-soft);
  border-radius: 4px;
  font-size: 0.92em;
  padding: 1px 5px;
}

.feature-grid a {
  font-size: 13.5px;
  font-weight: 700;
  margin-top: auto;
  text-decoration: none;
}

/* ---------- proof card ---------- */

.proof-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--ink);
  display: block;
  padding: 26px 28px;
  text-decoration: none;
  transition: border-color 0.15s ease;
}

.proof-card:hover {
  border-color: var(--green);
}

.proof-tag {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
}

.proof-card strong {
  display: block;
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 640;
  margin: 6px 0 10px;
}

.proof-card p {
  color: var(--muted);
  font-size: 14.5px;
  margin: 0 0 16px;
}

.proof-list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
}

.proof-list li {
  border-top: 1px solid var(--line);
  font-size: 14px;
  padding: 9px 0;
}

.proof-list li:last-child {
  border-bottom: 1px solid var(--line);
}

.proof-list code {
  background: var(--green-soft);
  border-radius: 4px;
  font-size: 0.92em;
  padding: 1px 5px;
}

.proof-link {
  color: var(--green);
  font-size: 13.5px;
  font-weight: 700;
}

/* ---------- docs map ---------- */

.docs-columns {
  display: grid;
  gap: 32px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.docs-col {
  border-top: 3px solid var(--green);
  padding-top: 16px;
}

.docs-col:nth-child(2) {
  border-top-color: var(--cyan);
}

.docs-col:nth-child(3) {
  border-top-color: var(--violet);
}

.docs-col h3 {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  margin: 0 0 12px;
  text-transform: uppercase;
}

.docs-col a {
  color: var(--ink);
  display: block;
  font-size: 15px;
  margin: 9px 0;
  text-decoration: none;
}

.docs-col a:hover {
  color: var(--green);
  text-decoration: underline;
}

/* ---------- blog teaser (post-card matches the blog) ---------- */

.all-posts {
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.post-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.post-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  min-height: 230px;
  padding: 22px;
  text-decoration: none;
  transition:
    border-color 0.15s ease,
    transform 0.15s ease;
}

.post-card:hover {
  border-color: var(--green);
  transform: translateY(-2px);
}

.post-card time {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
}

.post-card h3 {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 640;
  line-height: 1.2;
  margin: 10px 0 0;
}

.post-card p {
  color: var(--muted);
  font-size: 13.5px;
  margin: 10px 0 0;
}

.post-card code {
  background: var(--green-soft);
  border-radius: 4px;
  font-size: 0.92em;
  padding: 1px 4px;
}

.post-card .read-more {
  color: var(--green);
  font-size: 13.5px;
  font-weight: 700;
  margin-top: auto;
  padding-top: 18px;
}

/* ---------- quick start ---------- */

.quickstart {
  align-items: center;
  display: grid;
  gap: 56px;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 560px);
}

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 32px;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 1160px;
  padding: 28px 24px 44px;
}

.footer-inner p {
  margin: 0;
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  text-decoration: none;
}

/* ================= docs shell ================= */

.doc-layout {
  display: grid;
  gap: 48px;
  grid-template-columns: minmax(200px, 250px) minmax(0, 1fr);
  margin: 0 auto;
  max-width: 1160px;
  padding: 40px 24px 80px;
}

.doc-nav {
  align-self: start;
  border-right: 1px solid var(--line);
  padding-right: 24px;
  position: sticky;
  top: 88px;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
}

.nav-group {
  margin-bottom: 22px;
}

.nav-group h2 {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.1em;
  margin: 0 0 8px;
  text-transform: uppercase;
}

.nav-group a {
  border-left: 2px solid transparent;
  color: var(--ink);
  display: block;
  font-size: 14px;
  margin: 0 0 2px -12px;
  padding: 4px 0 4px 10px;
  text-decoration: none;
}

.nav-group a:hover {
  color: var(--green);
}

.nav-group a[aria-current='page'] {
  border-left-color: var(--green);
  color: var(--green);
  font-weight: 700;
}

.doc-content {
  min-width: 0;
}

.doc-content h1 {
  font-size: clamp(34px, 4.6vw, 52px);
}

.doc-content h2 {
  font-size: clamp(24px, 3vw, 32px);
  margin-top: 52px;
}

.doc-content h3 {
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 640;
  margin: 36px 0 10px;
}

.doc-content h4 {
  margin: 28px 0 8px;
}

.doc-content p,
.doc-content li {
  color: #2f3933;
  font-size: 16.5px;
}

.doc-content ul,
.doc-content ol {
  padding-left: 24px;
}

.doc-content blockquote {
  border-left: 4px solid var(--green);
  color: #2f3933;
  margin: 24px 0;
  padding: 4px 0 4px 20px;
}

.doc-content blockquote p {
  color: var(--muted);
}

.doc-content code {
  background: var(--green-soft);
  border-radius: 4px;
  font-size: 0.88em;
  padding: 2px 5px;
}

.doc-content pre {
  background: var(--code-bg);
  border-radius: 10px;
  color: #d8f3e5;
  font-size: 13.5px;
  line-height: 1.65;
  overflow-x: auto;
  padding: 18px 20px;
}

.doc-content pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

.doc-content table {
  display: block;
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
}

.doc-content img {
  max-width: 100%;
}

.doc-content .diagram {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  margin: 28px 0;
  padding: 20px;
}

.doc-content .diagram img {
  display: block;
  height: auto;
  margin: 0 auto;
  max-width: 100%;
}

.doc-content .diagram details {
  border-top: 1px dashed var(--line);
  margin-top: 16px;
  padding-top: 10px;
}

.doc-content .diagram summary {
  color: var(--muted);
  cursor: pointer;
  font-family: var(--mono);
  font-size: 12px;
}

.doc-content .diagram pre {
  font-size: 12.5px;
  margin: 10px 0 0;
}

.doc-content hr {
  border: none;
  border-top: 1px dashed var(--line);
  margin: 40px 0;
}

.doc-footer {
  border-top: 1px dashed var(--line);
  color: var(--muted);
  font-size: 13.5px;
  margin-top: 64px;
  padding-top: 20px;
}

/* ---------- responsive ---------- */

@media (max-width: 1020px) {
  .feature-grid,
  .post-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 880px) {
  .hero,
  .quickstart,
  .fanout {
    grid-template-columns: 1fr;
  }

  .section-head {
    align-items: start;
    flex-direction: column;
    gap: 8px;
  }

  .doc-layout {
    grid-template-columns: 1fr;
  }

  .doc-nav {
    border-bottom: 1px solid var(--line);
    border-right: none;
    max-height: none;
    padding: 0 0 18px;
    position: static;
  }
}

@media (max-width: 600px) {
  .nav {
    flex-wrap: wrap;
    gap: 10px;
    padding-bottom: 12px;
    padding-top: 12px;
  }

  .feature-grid,
  .post-grid,
  .fanout-grid,
  .docs-columns {
    grid-template-columns: 1fr;
  }

  section {
    padding: 52px 0;
  }

  .hero {
    padding: 48px 0 56px;
  }
}