/* 
  AKIOS v3 Design System
  Source of Truth: CSS Variables + Plain CSS
  No hidden themes. No frameworks.
*/

:root {
  color-scheme: light;

  /* Light canvas - Zinc Scale (Warmer/Neutral) */
  --bg: #ffffff;
  --bg-alt: #fafafa; /* Zinc-50 */
  --text: #18181b;   /* Zinc-950 */
  --muted: #52525b;  /* Zinc-600 - Darker/Stronger */

  /* Brand */
  --accent: #06b6d4;      /* Cyan-500 */
  --accent-dim: rgba(6, 182, 212, 0.10);

  /* Actions (AA) */
  --action: #0891b2;      /* Cyan-600 */
  --action-hover: #0e7490; /* Cyan-700 */

  /* UI */
  --border: #e4e4e7;        /* Zinc-200 */
  --border-subtle: #f4f4f5; /* Zinc-100 */

  /* Controlled dark surfaces (NOT a theme) */
  --surface-dark: #09090b;      /* Zinc-950 */
  --surface-dark-alt: #18181b;  /* Zinc-900 */
  --text-on-dark: #fafafa;      /* Zinc-50 */
  --muted-on-dark: #a1a1aa;     /* Zinc-400 */
  --border-on-dark: #27272a;    /* Zinc-800 */

  /* Typography */
  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --lh-body: 1.6;
  --lh-head: 1.2;

  --fs-h1: 2.5rem;
  --fs-h2: 1.75rem;
  --fs-h3: 1.25rem;
  --fs-h4: 1.0625rem;

  /* Spacing */
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4rem;

  /* Layout */
  --page: 960px;
  --gutter: var(--space-4);
  --header-height: 64px;
  --radius: 8px;
  --radius-sm: 4px;

  /* Surfaces */
  --hero-bg: #ecfeff; /* Cyan-50 - Happy & Distinct */
  --footer-bg: #253443; /* Slate-900 - Premium Builder */
}

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--action);
  text-decoration: none;
  font-weight: 500;
}

a:hover {
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
}

a:focus-visible,
.btn:focus-visible,
.copy-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  text-decoration: none;
}

h1, h2, h3, h4, h5, h6 {
  line-height: var(--lh-head);
  font-weight: 700; /* Bolder for confidence */
  color: var(--text);
  letter-spacing: -0.025em; /* Tighter for modern feel */
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }
h4 { font-size: var(--fs-h4); }

p {
  margin-bottom: var(--space-3);
  max-width: 70ch; /* Readable measure */
}

.subtitle {
  color: var(--muted);
  margin-bottom: var(--space-3);
  max-width: 60ch;
}

ul, ol {
  margin-bottom: var(--space-3);
  padding-left: var(--space-4);
}

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

/* --- Components: Layout --- */
.page {
  max-width: var(--page);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section {
  padding: var(--space-7) 0;
}

.section-hero {
  background-color: var(--hero-bg);
  background-image: radial-gradient(var(--accent-dim) 1px, transparent 1px);
  background-size: 24px 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.hero-simple {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
  max-width: 800px;
}

.hero-simple .subtitle {
  margin-left: auto;
  margin-right: auto;
}

.section-hero .page {
  padding-left: var(--gutter);
  padding-right: var(--gutter);
  max-width: 1200px;
}

.section-last {
  padding-bottom: var(--space-2);
}

.band {
  width: 100%;
  background-color: var(--bg-alt);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.band.section-last {
  border-bottom: none;
}

/* --- Components: Footer --- */
.site-footer {
  margin-top: 0;
  padding: var(--space-4) 0 var(--space-5);
  border-top: 1px solid var(--border-on-dark);
  background: var(--footer-bg);
  color: #ffffff;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  font-size: 0.875rem;
}

.footer-left {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.footer-tagline {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.78);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer-links-fixed {
  flex-direction: column;
  align-items: flex-end;
  gap: var(--space-2);
}

.footer-links-fixed .footer-row {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: flex-end;
}

.footer-social {
  display: flex;
  gap: var(--space-3);
  align-items: center;
}

.footer-social a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.6);
  transition: color 0.2s ease;
}

.footer-social a:hover {
  color: #ffffff;
}

.footer-social svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}


.footer-links a {
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links a:hover {
  color: #ffffff;
}

/* --- Components: Header --- */
.site-header {
  height: var(--header-height);
  display: flex;
  align-items: center;
  border-top: 3px solid var(--accent);
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg);
  /* Optional: sticky */
  position: sticky;
  top: 0;
  z-index: 100;
  padding-inline: var(--space-3);
}

.site-header .page {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0; /* Remove default page padding to let site-header control it */
}


.brand {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-links {
  display: flex;
  gap: var(--space-4);
  align-items: center;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.9375rem;
}

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

.nav-links a.active {
  color: var(--text);
  border-bottom: 2px solid var(--accent);
  padding-bottom: 0;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-left: var(--space-3);
  font-size: 0.8125rem;
  color: var(--muted);
}

.lang-switch-label {
  font-size: 0.75rem;
  color: var(--muted);
}

.lang-link {
  font-size: 0.8125rem;
}

/* --- Components: Hero --- */
.hero {
  /* background: var(--bg); */
  /* border-radius: var(--radius); */
  padding: var(--space-6) var(--space-5);
  margin-top: var(--space-4);
  /* border: 1px solid var(--accent-dim); */
  /* box-shadow: 0 1px 0 rgba(0, 0, 0, 0.04); */
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  align-items: center;
  gap: var(--space-6);
}

.hero-left {
  grid-column: span 5; /* Reduced from 6 to give more space to graph */
  position: relative; /* Ensure z-index works */
  z-index: 10;        /* Place text above graph on overlap */
}

.hero-figure {
  grid-column: span 7; /* Increased from 6 */
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  background: transparent;
  border: none;
  box-shadow: none;
  min-width: 0;
}

.hero-figure img {
  width: 100%;
  max-width: 100%; /* Allow full use of the 7 columns */
  display: block;
}

.hero h1 {
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
  white-space: nowrap; /* Force single line segments (respecting <br>) */
  max-width: none;
}

.hero h1 br {
  display: block;
  content: "";
}

.hero .subtitle {
  font-size: 1.25rem;
  color: var(--text); /* Stronger than muted */
  opacity: 0.8;       /* Slight soften, but readable */
  margin-bottom: var(--space-5);
  max-width: 50ch;
}

.hero-actions {
  display: flex;
  gap: var(--space-3);
  align-items: center;
}

/* --- Components: Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 0.9375rem;
  transition: all 0.2s ease;
}

.btn-primary {
  background: var(--action);
  color: #fff;
  border: 1px solid var(--action);
  box-shadow: 0 4px 14px 0 rgba(8, 145, 178, 0.3); /* Subtle Cyan Glow */
}

.btn-primary:hover {
  background: var(--action-hover);
  border-color: var(--action-hover);
  text-decoration: none;
}

.btn-outline {
  background: transparent;
  color: var(--action);
  border: 1px solid var(--accent);
}

.btn-outline:hover {
  background: var(--accent-dim);
  text-decoration: none;
}

/* --- Components: Code Block --- */
pre {
  background: var(--bg-alt);
  color: var(--text);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  overflow-x: auto;
  margin-bottom: var(--space-4);
  position: relative;
  padding: var(--space-3);
}

.copy-btn {
  position: absolute;
  top: var(--space-1);
  right: var(--space-1);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 8px;
  font-size: 0.75rem;
  color: var(--muted);
  cursor: pointer;
  opacity: 0;
  transition: all 0.2s ease;
}

pre:hover .copy-btn {
  opacity: 1;
}

.copy-btn:focus-visible {
  opacity: 1;
}

.copy-btn:hover {
  color: var(--text);
  border-color: var(--border-subtle);
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--border-subtle); /* Slightly darker than bg-alt for contrast */
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  color: var(--text); /* Ensure high contrast */
}

pre code {
  background: transparent;
  padding: 0;
  border-radius: 0;
  font-size: inherit;
  color: inherit;
}

.code-caption {
  font-size: 0.875rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.quickstart-link-row {
  margin-top: var(--space-4);
}

.quickstart-link {
  font-weight: 600;
}

.arch-diagram {
  background: var(--bg);
  border: 1px solid var(--border);
  padding: var(--space-4);
  border-radius: var(--radius);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.arch-svg {
  width: 100%;
  max-width: 760px;
  display: block;
  margin: var(--space-4) auto 0 auto;
}

/* --- Components: Tables --- */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-4);
  font-size: 0.9375rem;
}

th, td {
  padding: var(--space-2);
  border-bottom: 1px solid var(--border-subtle);
  text-align: left;
}

th {
  font-weight: 600;
  color: var(--text);
  border-bottom: 1px solid var(--border);
}

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

/* --- Components: Blockquote --- */
blockquote {
  margin: 0 0 var(--space-4) 0;
  padding: var(--space-3);
  border-left: 4px solid var(--accent);
  background: var(--bg-alt);
  border-radius: 0 var(--radius) var(--radius) 0;
}

blockquote p:last-child {
  margin-bottom: 0;
}

.section-heading {
  display: inline-block;
  border-bottom: 2px solid var(--accent);
  padding-bottom: var(--space-1);
}

/* --- Specifics: Feature List --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-5);
  margin-top: var(--space-5);
}

.feature h3 {
  margin-bottom: var(--space-2);
}

.feature p {
  color: var(--muted);
  font-size: 0.9375rem;
}

/* --- Security list --- */
.security-list {
  list-style: none;
  padding: 0;
  margin: var(--space-3) 0 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-3);
}

.security-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-3);
  background: #fff;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.05);
  position: relative;
  color: var(--text);
}

.security-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--accent);
  border-radius: var(--radius) 0 0 var(--radius);
}

.security-item p {
  margin: 0;
}

/* --- Agents --- */
.agents-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.agent-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-3);
  background: #fff;
  box-shadow: 0 6px 18px rgba(15, 23, 42, 0.04);
}

.agent-card h3 {
  margin-bottom: var(--space-2);
}

.agent-card p {
  color: var(--muted);
  font-size: 0.9375rem;
}

/* --- Callout --- */
.callout {
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: var(--space-3);
  background: var(--bg-alt);
  box-shadow: 0 6px 20px rgba(15, 23, 42, 0.04);
}

/* --- Components: Blog --- */
.blog-list {
  max-width: 700px;
  margin-top: var(--space-6);
}

.post-item {
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--border-subtle);
}

/* --- Specifics: CTA Section --- */
.section-cta {
  text-align: left;
}
.section-cta p {
  margin-left: 0;
  margin-right: 0;
  text-align: left;
}

.post-item:last-child {
  border-bottom: none;
}

.post-item h2 {
  font-size: 1.75rem; /* Larger for impact */
  margin-bottom: var(--space-2);
  letter-spacing: -0.025em;
  font-weight: 700;
}

.post-item h2 a {
  color: var(--text);
  text-decoration: none;
}

.post-item h2 a:hover {
  color: var(--action);
  text-decoration: none; /* Clean hover */
}

.post-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem; /* Tech-spec size */
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Optional: Add a small accent dot */
.post-meta::before {
  content: "";
  display: block;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}

.post-author {
  display: none;
}

.avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-alt);
}

/* Post Page */
.post-header {
  margin-bottom: var(--space-6);
  max-width: 800px;
}

.post-header h1 {
  margin-bottom: var(--space-3);
  line-height: 1.1;
}

.post-content {
  max-width: 700px; /* Optimal reading width */
}

.post-content .lead {
  font-size: 1.25rem;
  color: var(--muted);
  margin-bottom: var(--space-5);
  line-height: 1.6;
}

.post-footer {
  margin-top: var(--space-7);
  padding-top: var(--space-5);
  border-top: 1px solid var(--border-subtle);
}

/* --- Utility --- */
.text-center { text-align: center; }
.mb-0 { margin-bottom: 0; }

/* --- Docs Layout --- */
.docs-wrapper {
  display: grid;
  grid-template-columns: 240px 1fr; /* Fixed sidebar, fluid content */
  gap: var(--space-5);
  align-items: start;
  padding: var(--space-5) 0;
}

.docs-sidebar {
  position: sticky;
  top: calc(var(--header-height) + var(--space-4));
  padding-right: var(--space-3);
  border-right: 1px solid var(--border-subtle);
  max-height: calc(100vh - var(--header-height) - var(--space-6));
  overflow-y: auto;
}

.docs-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.docs-nav li {
  margin-bottom: var(--space-1);
}

.docs-nav a {
  display: block;
  color: var(--muted);
  font-size: 0.9375rem;
  padding: 4px 0;
  font-weight: 400;
}

.docs-nav a:hover {
  color: var(--text);
  font-weight: 500;
}

.docs-nav a.active {
  color: var(--text);
  font-weight: 500;
  border-left: 2px solid var(--accent);
  padding-left: var(--space-2);
}

.docs-nav .section-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text);
  font-weight: 600;
  margin-top: var(--space-4);
  margin-bottom: var(--space-2);
}

.docs-content {
  min-width: 0; /* Prevent grid blowout */
}

/* Docs Content Typography */
.docs-content h1 {
  margin-bottom: var(--space-4);
}

.docs-content h2 {
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: var(--space-2);
}

.docs-content h3 {
  margin-top: var(--space-5);
  margin-bottom: var(--space-2);
}

.docs-content p {
  line-height: 1.7;
  margin-top: 0;
  margin-bottom: var(--space-3);
}

.docs-cards {
  margin-top: var(--space-3);
}

.docs-card {
  display: block;
  padding: var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: inherit;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.docs-card:hover {
  border-color: var(--accent);
  background: var(--accent-dim);
  text-decoration: none;
  transform: translateY(-1px);
}

.docs-card-title {
  font-size: var(--fs-h3);
  color: var(--action);
  margin-bottom: var(--space-1);
}

.docs-card-text {
  font-size: 0.9375rem;
  color: var(--muted);
  margin-bottom: 0;
}

/* Responsive Docs */
@media (max-width: 768px) {
  /* Stack Header on mobile */
  .site-header {
    height: auto;
    padding: var(--space-3) 0;
  }

  .section {
    padding: var(--space-5) 0;
  }
  
  .site-header .page {
    flex-direction: column;
    gap: var(--space-3);
  }
  
  .nav-links {
    gap: var(--space-3);
    flex-wrap: wrap;
    justify-content: center;
  }

  /* Docs Layout Mobile */
  .docs-wrapper {
    grid-template-columns: 1fr;
  }
  
  .docs-sidebar {
    position: static;
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
    padding-bottom: var(--space-4);
    margin-bottom: var(--space-4);
    max-height: none;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-links-fixed {
    align-items: flex-start;
  }

  .footer-links-fixed .footer-row {
    justify-content: flex-start;
  }
}

@media (max-width: 768px) {
  .agents-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* Responsive Hero - Stack earlier for graph visibility */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: var(--space-5);
    text-align: center;
  }

  .hero-left, .hero-figure {
    grid-column: span 1;
  }
  
  .hero-left {
    order: 1; /* Text first */
    margin-bottom: var(--space-4);
  }

  .hero h1 {
    white-space: normal; /* Allow wrapping on smaller screens */
  }

  .hero-figure {
    order: 2; /* Graph second */
  }

  .hero-actions {
    justify-content: center;
  }
  
  .hero .subtitle {
    margin-left: auto;
    margin-right: auto;
  }
}

@media (max-width: 480px) {
  .agents-grid {
    grid-template-columns: 1fr;
  }

  /* .hero-grid overrides handled in 1024px query now */
  
  .hero {
    padding: var(--space-4) var(--space-3);
    margin-top: var(--space-2);
  }

  .section-hero .page {
    padding-left: var(--gutter);
    padding-right: var(--gutter);
    max-width: var(--page);
  }

  .hero h1 {
    font-size: 1.5rem;
  }

  .hero .subtitle {
    font-size: 0.9rem;
    max-width: 34ch;
  }

  .btn {
    font-size: 0.75rem;
    padding: 0.4rem 0.9rem;
    white-space: nowrap;
  }

  .hero-actions {
    gap: var(--space-2);
  }
}

/* --- Specifics: Share Links --- */
.share-links {
  display: flex;
  gap: var(--space-3);
  align-items: center;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.875rem;
}

.share-links span {
  color: var(--muted);
  font-weight: 500;
}

.share-links a {
  color: var(--text);
  text-decoration: none;
}

.share-links a:hover {
  color: var(--action);
  text-decoration: underline;
}

.community-grid {
  grid-template-columns: 1fr;
  max-width: 600px;
  margin-top: 0;
}

.community-feature {
  margin-bottom: var(--space-5);
}

.muted-list {
  color: var(--muted);
  margin-top: var(--space-2);
  font-size: 0.9375rem;
}