/* ================================================================
   LinkML Site Styles
   Colors sourced from the LinkML logo:
     --green : olive/lime green used in "link" text
     --teal  : teal used in the "M" letterform
   ================================================================ */

:root {
  --green:        #8B9E2C;
  --green-dark:   #6B7A1F;
  --green-light:  #C9D96B;
  --teal:         #1B8FA0;
  --teal-dark:    #126475;
  --teal-light:   #6ECADB;
  --white:        #FFFFFF;
  --off-white:    #F5F7F0;
  --gray-light:   #E6EAD8;
  --gray-mid:     #9BA88A;
  --text-dark:    #1C2510;
  --text-mid:     #4A5538;
  --text-light:   #717D5C;
  --radius:       8px;
  --shadow:       0 4px 24px rgba(0,0,0,0.08);
  --transition:   0.2s ease;
  --max-width:    1100px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--text-dark);
  background: var(--white);
}

img { max-width: 100%; height: auto; display: block; border-radius: var(--radius); }

a { color: var(--teal); text-decoration: none; }
a:hover { color: var(--teal-dark); text-decoration: underline; }

h1, h2, h3 {
  line-height: 1.2;
  color: var(--text-dark);
  font-weight: 700;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); }
h3 { font-size: 1.2rem; }

p { margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

strong { color: inherit; font-weight: 700; }

code {
  background: var(--gray-light);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  font-family: 'Consolas', 'Monaco', monospace;
  font-size: 0.88em;
  color: var(--teal-dark);
}

/* ----------------------------------------------------------------
   Layout helpers
   ---------------------------------------------------------------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ----------------------------------------------------------------
   Buttons
   ---------------------------------------------------------------- */
.btn {
  display: inline-block;
  padding: 0.7rem 1.6rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), transform var(--transition);
  text-decoration: none;
}
.btn:hover { transform: translateY(-1px); text-decoration: none; }

.btn-primary {
  background: var(--green);
  color: var(--white);
}
.btn-primary:hover { background: var(--green-dark); color: var(--white); }

.btn-hero {
  background: var(--white);
  color: var(--teal-dark);
  font-size: 1rem;
  padding: 0.85rem 2rem;
  box-shadow: 0 2px 12px rgba(0,0,0,0.15);
}
.btn-hero:hover { background: var(--off-white); color: var(--teal-dark); }

.btn-secondary {
  background: transparent;
  color: var(--teal);
  border: 2px solid var(--teal);
  margin-top: 0.5rem;
}
.btn-secondary:hover { background: var(--teal); color: var(--white); }

/* ----------------------------------------------------------------
   Header / Navigation
   ---------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 2px solid var(--gray-light);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding-top: 0.85rem;
  padding-bottom: 0.85rem;
}

.logo-link { flex-shrink: 0; }
.logo { height: 44px; width: auto; border-radius: 0; }

.main-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex: 1;
}
.main-nav a {
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  color: var(--text-mid);
  font-weight: 500;
  font-size: 0.92rem;
  transition: background var(--transition), color var(--transition);
}
.main-nav a:hover {
  background: var(--off-white);
  color: var(--green-dark);
  text-decoration: none;
}

.nav-cta { margin-left: auto; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-dark);
  margin-left: auto;
}

/* ----------------------------------------------------------------
   Hero
   ---------------------------------------------------------------- */
.hero {
  background: var(--teal);
  color: var(--white);
  padding: 5rem 0 4rem;
  overflow: hidden;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-text h1 { color: var(--white); }

.hero-text .accent {
  color: var(--green-light);
  display: block;
}

.hero-text p {
  font-size: 1.15rem;
  opacity: 0.92;
  margin: 1.25rem 0 2rem;
  max-width: 440px;
}

.hero-image img {
  border-radius: var(--radius);
  box-shadow: 0 8px 40px rgba(0,0,0,0.25);
}

/* ----------------------------------------------------------------
   Feature sections (alternating image + text)
   ---------------------------------------------------------------- */
.feature {
  padding: 5rem 0;
  background: var(--white);
}

.feature.feature-alt {
  background: var(--off-white);
}

.feature-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

/* Items in .feature-reverse sections are ordered text-first in HTML,
   which naturally places text on the left and image on the right. */

.feature-text h2 { margin-bottom: 1rem; }
.feature-text h2 strong { color: var(--teal); }

.feature-media img {
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-light);
}

/* ----------------------------------------------------------------
   Full-width centered text sections
   ---------------------------------------------------------------- */
.feature-centered {
  padding: 5rem 0;
  background: var(--off-white);
  text-align: center;
}

.feature-centered.feature-centered-alt {
  background: var(--white);
}

.feature-centered .container { max-width: 760px; }

.feature-centered h2 { margin-bottom: 1rem; }
.feature-centered h2 strong { color: var(--teal); }

/* Artifact type tags */
.artifact-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: center;
  margin-top: 2rem;
}

.tag {
  background: var(--white);
  color: var(--teal-dark);
  border: 2px solid var(--teal-light);
  border-radius: 999px;
  padding: 0.3rem 1rem;
  font-size: 0.85rem;
  font-weight: 600;
}

/* Slides embed */
.slides-embed {
  position: relative;
  width: 100%;
  max-width: 960px;
  margin: 2rem auto 0;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.slides-embed iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  border: none;
  border-radius: var(--radius);
}

/* ----------------------------------------------------------------
   Steps section
   ---------------------------------------------------------------- */
.steps {
  padding: 5rem 0;
  background: linear-gradient(135deg, var(--green-dark) 0%, var(--green) 100%);
  color: var(--white);
}

.steps .container { max-width: 700px; }

.steps h2 {
  color: var(--white);
  margin-bottom: 0.5rem;
  text-align: center;
}

.steps > .container > p {
  text-align: center;
  opacity: 0.9;
  margin-bottom: 2.5rem;
}

.steps-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.steps-list li {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  background: rgba(255,255,255,0.12);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
}

.step-number {
  flex-shrink: 0;
  width: 2.25rem;
  height: 2.25rem;
  background: var(--white);
  color: var(--green-dark);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
}

.step-content p { margin: 0; }
.step-content a { color: var(--green-light); font-weight: 600; }
.step-content a:hover { color: var(--white); }
.step-content code {
  background: rgba(255,255,255,0.15);
  padding: 0.1em 0.45em;
  border-radius: 4px;
  font-family: 'Consolas', 'Monaco', monospace;
  font-size: 0.88em;
}

/* ----------------------------------------------------------------
   Footer
   ---------------------------------------------------------------- */
.site-footer {
  background: var(--text-dark);
  color: var(--gray-mid);
  padding: 3rem 0 2rem;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}

.footer-logo { height: 36px; width: auto; border-radius: 0; filter: brightness(0) invert(1); opacity: 0.85; }

.footer-tagline {
  font-size: 1.1rem;
  color: var(--gray-light);
  margin: 0;
}

.footer-nav {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-nav a {
  color: var(--gray-mid);
  font-size: 0.9rem;
  transition: color var(--transition);
}
.footer-nav a:hover { color: var(--teal-light); text-decoration: none; }

/* ----------------------------------------------------------------
   Code block (used in Stealth Semantics)
   ---------------------------------------------------------------- */
.code-block {
  background: #1a2010;
  color: #d4e89a;
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  font-size: 0.84rem;
  line-height: 1.65;
  text-align: left;
  overflow-x: auto;
  margin: 1.75rem auto 0;
  max-width: 640px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.2);
}
.code-block .cm  { color: var(--teal-light); font-style: italic; }   /* comment */
.code-block .k   { color: var(--green-light); }                       /* key */
.code-block .v   { color: #ffffff; }                                  /* value */
.code-block .uri { color: #a8d8e8; }                                  /* URI */

/* ----------------------------------------------------------------
   Pull quote
   ---------------------------------------------------------------- */
.pull-quote {
  border-left: 4px solid var(--teal);
  padding: 1rem 1.5rem;
  margin: 2rem auto 0;
  max-width: 640px;
  background: var(--off-white);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-style: italic;
  color: var(--text-mid);
  font-size: 0.97rem;
  text-align: left;
}
.pull-quote cite {
  display: block;
  margin-top: 0.5rem;
  font-style: normal;
  font-size: 0.82rem;
  color: var(--text-light);
}

/* ----------------------------------------------------------------
   Grouped artifact tags
   ---------------------------------------------------------------- */
.artifact-groups {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 2rem;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
  text-align: left;
}
.artifact-group {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}
.artifact-group-label {
  flex-shrink: 0;
  width: 148px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-light);
  padding-top: 0.38rem;
}
.artifact-group-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

/* ----------------------------------------------------------------
   Ecosystem section
   ---------------------------------------------------------------- */
.ecosystem-section {
  padding: 5rem 0;
  background: var(--off-white);
  text-align: center;
}
.ecosystem-section h2 { margin-bottom: 0.75rem; }
.ecosystem-section > .container > p { max-width: 640px; margin: 0 auto; }

.ecosystem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 2.5rem;
  text-align: left;
}
.ecosystem-card {
  background: var(--white);
  border: 1px solid var(--gray-light);
  border-radius: var(--radius);
  padding: 1.35rem 1.5rem;
  transition: box-shadow var(--transition), transform var(--transition);
  text-decoration: none;
  display: block;
  color: inherit;
}
.ecosystem-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
  text-decoration: none;
}
.ecosystem-card h3 {
  color: var(--teal);
  margin-bottom: 0.35rem;
  font-size: 1rem;
}
.ecosystem-card p {
  font-size: 0.88rem;
  color: var(--text-mid);
  margin: 0;
  line-height: 1.55;
}

/* ----------------------------------------------------------------
   Community / Who uses LinkML section
   ---------------------------------------------------------------- */
.community-section {
  padding: 5rem 0;
  background: var(--white);
  text-align: center;
}
.community-section h2 { margin-bottom: 0.75rem; }
.community-section > .container > p {
  max-width: 600px;
  margin: 0 auto;
}

.usage-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  justify-content: center;
  margin-top: 2rem;
}
.usage-item {
  background: var(--off-white);
  border: 1px solid var(--gray-light);
  border-radius: var(--radius);
  padding: 0.55rem 1.1rem;
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--text-mid);
}

.community-stats {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin-top: 2.5rem;
  flex-wrap: wrap;
}
.stat {
  text-align: center;
}
.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--teal);
  line-height: 1;
}
.stat-label {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-top: 0.3rem;
}

.citation {
  margin-top: 2.5rem;
  font-size: 0.83rem;
  color: var(--text-light);
  font-style: italic;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}
.citation a { color: var(--teal); }

/* ----------------------------------------------------------------
   Google Fonts fallback (loaded via <link> in HTML)
   ---------------------------------------------------------------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* ----------------------------------------------------------------
   Responsive
   ---------------------------------------------------------------- */
@media (max-width: 840px) {
  .hero-inner,
  .feature-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .feature-reverse { direction: ltr; }

  .hero { padding: 3.5rem 0 3rem; }
  .hero-text p { max-width: 100%; }

  .feature,
  .feature-centered,
  .steps { padding: 3.5rem 0; }

  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem 1.5rem;
    border-bottom: 2px solid var(--gray-light);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  }
  .main-nav.open { display: flex; }

  .nav-toggle { display: block; }
  .nav-cta { display: none; }

  .header-inner { position: relative; }
}

@media (max-width: 480px) {
  .artifact-tags { gap: 0.4rem; }
  .steps-list li { padding: 1rem 1.1rem; }
  .artifact-group { flex-direction: column; gap: 0.4rem; }
  .artifact-group-label { width: auto; }
  .community-stats { gap: 2rem; }
}