/* ============================================================
   Open Talent Protocol – Site Stylesheet
   ============================================================ */

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

:root {
  --color-bg:         #ffffff;
  --color-bg-alt:     #f8f9fc;
  --color-bg-code:    #f1f3f8;
  --color-border:     #e2e6ef;
  --color-text:       #1a1d2e;
  --color-text-muted: #5a6175;
  --color-accent:     #2563eb;
  --color-accent-dk:  #1d4ed8;
  --color-accent-lt:  #eff4ff;
  --color-required:   #dc2626;
  --color-optional:   #059669;
  --color-tag-bg:     #e8edfc;
  --color-tag-text:   #2563eb;

  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Monaco, Consolas, monospace;

  --sidebar-width: 240px;
  --content-max:   780px;
  --nav-height:    56px;
  --radius:        6px;
  --transition:    0.15s ease;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.65;
}

a { color: var(--color-accent); text-decoration: none; }
a:hover { color: var(--color-accent-dk); text-decoration: underline; }

/* --- Top nav ----------------------------------------------- */
.top-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  z-index: 100;
}

.nav-brand {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-text);
  text-decoration: none;
}
.nav-brand:hover { color: var(--color-text); text-decoration: none; }

.nav-brand-name { letter-spacing: -0.01em; }

.nav-version {
  font-size: 0.7rem;
  font-weight: 600;
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  padding: 0.15em 0.5em;
  border-radius: 99px;
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
  font-size: 0.875rem;
}

.nav-links a {
  color: var(--color-text-muted);
  font-weight: 500;
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--color-accent); text-decoration: none; }

.nav-github {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--color-text) !important;
  font-weight: 600 !important;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.3rem 0.75rem !important;
  transition: border-color var(--transition), background var(--transition) !important;
}
.nav-github:hover {
  background: var(--color-bg-alt) !important;
  border-color: var(--color-text-muted) !important;
  text-decoration: none !important;
}

/* --- Layout ------------------------------------------------- */
.layout {
  display: flex;
  margin-top: var(--nav-height);
  min-height: calc(100vh - var(--nav-height));
}

/* --- Sidebar ----------------------------------------------- */
.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  position: sticky;
  top: var(--nav-height);
  height: calc(100vh - var(--nav-height));
  overflow-y: auto;
  border-right: 1px solid var(--color-border);
  padding: 1.5rem 0;
  background: var(--color-bg);
}

.sidebar-section { margin-bottom: 1.25rem; }

.sidebar-label {
  font-size: 0.675rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  padding: 0 1.25rem 0.4rem;
}

.sidebar-nav { list-style: none; }

.sidebar-nav a {
  display: block;
  padding: 0.3rem 1.25rem;
  font-size: 0.845rem;
  color: var(--color-text-muted);
  border-left: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
  text-decoration: none;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
  background: var(--color-accent-lt);
}

/* --- Main content ------------------------------------------ */
.main {
  flex: 1;
  min-width: 0;
  padding: 3rem 2.5rem 6rem;
}

.content-wrap { max-width: var(--content-max); }

/* --- Hero -------------------------------------------------- */
.hero {
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 3rem;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.hero h1 {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

.hero-tagline {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 560px;
  margin-bottom: 1.5rem;
}

.hero-actions { display: flex; gap: 0.75rem; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.btn-primary:hover { background: var(--color-accent-dk); border-color: var(--color-accent-dk); color: #fff; text-decoration: none; }

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-outline:hover { background: var(--color-bg-alt); border-color: var(--color-text-muted); color: var(--color-text); text-decoration: none; }

/* --- Section headers --------------------------------------- */
.spec-section {
  margin-bottom: 3.5rem;
  scroll-margin-top: calc(var(--nav-height) + 1.5rem);
}

.spec-section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.4rem;
}

.spec-section h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 1.75rem 0 0.5rem;
}

.spec-section p {
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  max-width: 640px;
}

.section-divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin-bottom: 2rem;
}

/* --- Section badge ----------------------------------------- */
.section-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.2em 0.55em;
  border-radius: 99px;
  letter-spacing: 0.03em;
}

.badge-required {
  background: #fee2e2;
  color: var(--color-required);
}

.badge-optional {
  background: #d1fae5;
  color: var(--color-optional);
}

.badge-new {
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
}

/* --- Property table ---------------------------------------- */
.prop-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.845rem;
  margin-bottom: 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.prop-table th {
  background: var(--color-bg-alt);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  padding: 0.6rem 0.85rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.prop-table td {
  padding: 0.65rem 0.85rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.prop-table tr:last-child td { border-bottom: none; }
.prop-table tr:hover td { background: var(--color-bg-alt); }

.prop-name {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-accent);
  font-weight: 500;
  white-space: nowrap;
}

.prop-type {
  font-family: var(--font-mono);
  font-size: 0.775rem;
  color: #7c3aed;
  white-space: nowrap;
}

.prop-req {
  font-size: 0.72rem;
  font-weight: 600;
  white-space: nowrap;
}

.req-yes { color: var(--color-required); }
.req-no  { color: var(--color-text-muted); }

.prop-desc { color: var(--color-text-muted); line-height: 1.5; }

/* --- Code blocks ------------------------------------------- */
pre, code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

pre {
  background: var(--color-bg-code);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  line-height: 1.6;
  margin: 1rem 0 1.5rem;
}

code {
  background: var(--color-bg-code);
  border: 1px solid var(--color-border);
  padding: 0.1em 0.35em;
  border-radius: 3px;
  font-size: 0.82em;
  color: #7c3aed;
}

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

/* JSON syntax highlight */
.json-key    { color: #1d4ed8; }
.json-str    { color: #059669; }
.json-num    { color: #d97706; }
.json-bool   { color: #7c3aed; }
.json-null   { color: #6b7280; }
.json-punct  { color: #374151; }

/* --- Callout ----------------------------------------------- */
.callout {
  background: var(--color-accent-lt);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 0.85rem 1.1rem;
  margin: 1.25rem 0;
  font-size: 0.875rem;
  color: var(--color-text);
}

.callout strong { color: var(--color-accent-dk); }

/* --- Examples grid ----------------------------------------- */
.examples-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1.25rem 0;
}

.example-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  text-decoration: none;
  color: var(--color-text);
  display: block;
}

.example-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 12px rgba(37,99,235,0.09);
  text-decoration: none;
  color: var(--color-text);
}

.example-card-role {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  margin-bottom: 0.3rem;
}

.example-card-name {
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.example-card-desc {
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

/* --- Inline enum list -------------------------------------- */
.enum-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0.4rem 0 0.75rem;
}

.enum-val {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--color-bg-code);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  padding: 0.1em 0.45em;
  color: #7c3aed;
}

/* --- Footer ------------------------------------------------ */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-alt);
  padding: 2rem 2.5rem;
  font-size: 0.845rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-links { display: flex; gap: 1.5rem; }
.footer-links a { color: var(--color-text-muted); }
.footer-links a:hover { color: var(--color-accent); }

/* --- Responsive -------------------------------------------- */
@media (max-width: 768px) {
  .sidebar { display: none; }

  .main { padding: 2rem 1.25rem 4rem; }

  .hero h1 { font-size: 1.65rem; }

  .nav-links { display: none; }

  .prop-table th:nth-child(3),
  .prop-table td:nth-child(3) { display: none; }

  .examples-grid { grid-template-columns: 1fr; }
}