/* ==========================================================================
   AI Agent Skills – Design system & layout (aiagentskills.cc)
   ========================================================================== */

:root {
  --font-heading: 'Syne', system-ui, sans-serif;
  --font-body: 'Source Sans 3', system-ui, sans-serif;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 64px;
  --bg-primary: #0d0d0f;
  --bg-secondary: #141416;
  --bg-card: #1a1a1d;
  --bg-elevated: #222226;
  --text-primary: #f2f2f4;
  --text-secondary: #a0a0a8;
  --text-muted: #6b6b72;
  --accent: #2dd4bf;
  --accent-hover: #5eead4;
  --accent-muted: rgba(45, 212, 191, 0.15);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.12);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --transition: 0.2s ease;
  --container-max: 1120px;
  --header-height: 72px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: clamp(16px, 2vw, 18px);
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  min-height: 100vh;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-2);
  padding: var(--space-1) var(--space-2);
  background: var(--accent);
  color: var(--bg-primary);
  font-weight: 600;
  z-index: 1000;
  border-radius: var(--radius-sm);
  transition: top var(--transition);
}
.skip-link:focus { top: var(--space-2); outline: none; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 var(--space-2);
}
h1 { font-size: clamp(28px, 5vw, 56px); }
h2 { font-size: clamp(22px, 3.5vw, 36px); margin-bottom: var(--space-3); }
h3 { font-size: clamp(18px, 2.5vw, 22px); margin-bottom: var(--space-1); }
p { margin: 0 0 var(--space-2); color: var(--text-secondary); }
p:last-child { margin-bottom: 0; }

.breadcrumb {
  position: absolute;
  top: var(--header-height);
  left: 0;
  right: 0;
  padding: var(--space-1) var(--space-3);
  font-size: 0.875rem;
  background: transparent;
  z-index: 1;
}
.breadcrumb ol { margin: 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: var(--space-1); }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent); }

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-3);
}
@media (min-width: 768px) { .container { padding: 0 var(--space-4); } }

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(13, 13, 15, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-3);
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text-primary);
}
.logo:hover { color: var(--text-primary); }
.logo-mark { color: var(--accent); }
.nav-main { display: none; }
@media (min-width: 900px) {
  .nav-main { display: block; }
  .nav-list { display: flex; gap: var(--space-4); list-style: none; margin: 0; padding: 0; }
  .nav-list a { color: var(--text-secondary); font-weight: 500; font-size: 0.9375rem; }
  .nav-list a:hover { color: var(--text-primary); }
}
.header-actions { display: none; gap: var(--space-2); }
@media (min-width: 900px) { .header-actions { display: flex; } }
.menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.menu-toggle:hover { background: var(--bg-elevated); }
.menu-toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.menu-toggle[aria-expanded="true"] .menu-bar:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] .menu-bar:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] .menu-bar:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }
.menu-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}
@media (min-width: 900px) { .menu-toggle { display: none; } }
.nav-mobile {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-secondary);
  padding: var(--space-4);
  overflow-y: auto;
  transform: translateX(100%);
  opacity: 0;
  visibility: hidden;
  transition: transform 0.25s ease, opacity 0.25s ease, visibility 0.25s;
  z-index: 99;
}
.nav-mobile.open,
.nav-mobile[aria-hidden="false"] {
  transform: translateX(0);
  opacity: 1;
  visibility: visible;
}
.nav-mobile-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: var(--space-2); }
.nav-mobile-list a { display: block; padding: var(--space-2); color: var(--text-primary); font-weight: 500; border-radius: var(--radius-sm); }
.nav-mobile-list a:hover { background: var(--bg-elevated); color: var(--accent); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-1) var(--space-3);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9375rem;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), transform 0.15s ease;
}
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn-primary { background: var(--accent); color: var(--bg-primary); }
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); }
.btn-secondary { background: var(--bg-elevated); color: var(--text-primary); border: 1px solid var(--border-strong); }
.btn-secondary:hover { background: var(--bg-card); border-color: var(--text-muted); }
.btn-ghost { background: transparent; color: var(--text-secondary); }
.btn-ghost:hover { color: var(--text-primary); background: var(--bg-elevated); }
.btn-lg { padding: var(--space-2) var(--space-4); font-size: 1rem; }

.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-height) + var(--space-6)) var(--space-3) var(--space-6);
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, var(--accent-muted), transparent 50%),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(80, 80, 90, 0.2), transparent 45%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-2);
}
.hero-clawhub .hero-inner {
  display: grid;
  gap: var(--space-5);
  align-items: center;
}
@media (min-width: 900px) {
  .hero-clawhub .hero-inner { grid-template-columns: 1fr 1fr; }
}
.hero-left { animation: fadeUp 0.7s ease both; }
.hero-right { animation: fadeUp 0.7s 0.15s ease both; }
.install-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}
.install-card-title { font-size: 1.125rem; margin-bottom: var(--space-1); }
.install-card-desc { font-size: 0.9375rem; color: var(--text-secondary); margin-bottom: var(--space-2); }
.pm-tabs { display: flex; gap: var(--space-1); margin-bottom: var(--space-2); }
.pm-tab {
  padding: var(--space-1) var(--space-2);
  font-size: 0.875rem;
  background: var(--bg-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.pm-tab:hover { color: var(--text-primary); }
.pm-tab.active { background: var(--accent-muted); color: var(--accent); border-color: var(--accent); }
.hero-right .hero-code { width: 100%; }
.section-title-secondary { font-size: clamp(20px, 2.5vw, 28px); margin-top: var(--space-5); margin-bottom: var(--space-2); }
.skill-author { font-size: 0.875rem; color: var(--text-muted); margin-bottom: var(--space-1); }
.skill-metrics { font-size: 0.8125rem; color: var(--text-muted); margin-bottom: var(--space-2); }
.skill-badge-highlight { background: rgba(45, 212, 191, 0.2); color: var(--accent); padding: 2px 8px; border-radius: var(--radius-sm); }
.what-are-skills .how-it-works,
.what-are-skills .compatible-agents { margin-top: var(--space-4); padding: var(--space-3); background: var(--bg-card); border-radius: var(--radius-md); border: 1px solid var(--border); }
.what-are-skills ol { margin: 0 0 var(--space-2); padding-left: var(--space-4); color: var(--text-secondary); }
.what-are-skills h3 { font-size: 1.125rem; margin-bottom: var(--space-2); }
.hero h1 { max-width: 20ch; margin-bottom: var(--space-3); animation: fadeUp 0.7s ease both; }
.hero-desc {
  max-width: 52ch;
  font-size: clamp(16px, 2vw, 18px);
  line-height: 1.65;
  margin-bottom: var(--space-4);
  animation: fadeUp 0.7s 0.1s ease both;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-5); animation: fadeUp 0.7s 0.2s ease both; }
.hero-code {
  position: relative;
  display: inline-block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-4);
  padding-right: 52px;
  animation: fadeUp 0.7s 0.3s ease both;
}
.hero-code pre { margin: 0; }
.hero-code code { font-family: ui-monospace, monospace; font-size: clamp(14px, 1.5vw, 16px); color: var(--text-primary); }
.copy-btn {
  position: absolute;
  top: 50%;
  right: var(--space-2);
  transform: translateY(-50%);
  padding: var(--space-1) var(--space-2);
  font-size: 0.8125rem;
  background: var(--bg-elevated);
  color: var(--text-secondary);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
.copy-btn:hover { background: var(--accent-muted); color: var(--accent); }
.copy-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.copy-btn.copied { color: var(--accent); }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.section { padding: var(--space-6) 0; }
.section-desc { max-width: 56ch; margin-bottom: var(--space-5); font-size: clamp(16px, 1.8vw, 18px); }
.section-cta { margin-top: var(--space-4); }
.link-arrow { color: var(--accent); font-weight: 600; }
.link-arrow:hover { text-decoration: underline; }

.skills-grid { display: grid; gap: var(--space-4); grid-template-columns: 1fr; }
@media (min-width: 640px) { .skills-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .skills-grid { grid-template-columns: repeat(3, 1fr); } }
.skill-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  transition: border-color var(--transition), box-shadow var(--transition), transform 0.2s ease;
}
.skill-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}
.skill-badge {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
}
.skill-name { font-family: var(--font-heading); font-size: 1.25rem; margin-bottom: var(--space-1); }
.skill-desc { font-size: 0.9375rem; margin-bottom: var(--space-2); color: var(--text-secondary); }
.skill-meta { font-size: 0.8125rem; color: var(--text-muted); margin-bottom: var(--space-2); }
.skill-link { font-weight: 600; font-size: 0.9375rem; }
.skill-link::after { content: ' →'; }

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
}
.compare-table { width: 100%; min-width: 320px; border-collapse: collapse; font-size: clamp(14px, 1.5vw, 16px); }
.compare-table th,
.compare-table td { padding: var(--space-2) var(--space-3); text-align: left; border-bottom: 1px solid var(--border); }
.compare-table th { background: var(--bg-elevated); font-weight: 600; color: var(--text-primary); }
.compare-table td { color: var(--text-secondary); }
.compare-table tbody tr:last-child td { border-bottom: none; }
.compare-table tbody tr:hover td { background: rgba(255,255,255,0.02); }

.features-grid { display: grid; gap: var(--space-4); grid-template-columns: 1fr; }
@media (min-width: 640px) { .features-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .features-grid { grid-template-columns: repeat(4, 1fr); } }
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  transition: border-color var(--transition), transform 0.2s ease;
}
.feature-card:hover { border-color: var(--border-strong); transform: translateY(-2px); }
.feature-icon { display: inline-block; font-size: 1.5rem; color: var(--accent); margin-bottom: var(--space-2); }
.feature-card h3 { margin-bottom: var(--space-1); font-size: 1.125rem; }
.feature-card p { font-size: 0.9375rem; margin: 0; }

.use-cases-list { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-2); max-width: 56ch; }
.use-cases-list li {
  padding: var(--space-2) var(--space-3);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--accent);
  color: var(--text-secondary);
}

.tabs { display: flex; gap: var(--space-1); margin-bottom: var(--space-4); border-bottom: 1px solid var(--border); }
.tab-btn {
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9375rem;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition);
}
.tab-btn:hover { color: var(--text-secondary); }
.tab-btn.active,
.tab-btn[aria-selected="true"] { color: var(--accent); border-bottom-color: var(--accent); }
.tab-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.tab-panel { display: block; }
.tab-panel.hidden { display: none; }
.guide-steps { margin: 0; padding-left: var(--space-4); color: var(--text-secondary); }
.guide-steps li { margin-bottom: var(--space-3); }
.code-block {
  position: relative;
  display: inline-block;
  margin: var(--space-1) 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-4);
  padding-right: 52px;
}
.code-block pre { margin: 0; }
.code-block code { font-family: ui-monospace, monospace; font-size: 0.9375rem; }
.code-block .copy-btn { top: 50%; right: var(--space-2); transform: translateY(-50%); }

.testimonials-grid { display: grid; gap: var(--space-4); grid-template-columns: 1fr; }
@media (min-width: 640px) { .testimonials-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .testimonials-grid { grid-template-columns: repeat(3, 1fr); } }
.testimonial-card {
  margin: 0;
  padding: var(--space-4);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.testimonial-card:hover { border-color: var(--border-strong); box-shadow: var(--shadow-sm); }
.testimonial-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  overflow: hidden;
  margin-bottom: var(--space-2);
  background: var(--bg-elevated);
}
.testimonial-avatar img { width: 100%; height: 100%; object-fit: cover; }
.testimonial-quote { font-size: 0.9375rem; font-style: italic; color: var(--text-secondary); margin-bottom: var(--space-2); }
.testimonial-card footer { font-size: 0.875rem; color: var(--text-muted); }
.testimonial-card cite { font-style: normal; font-weight: 600; color: var(--text-primary); }

.accordion { max-width: 720px; }
.accordion-item { border-bottom: 1px solid var(--border); }
.accordion-item:first-child { border-top: 1px solid var(--border); }
.accordion-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) 0;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
  color: var(--text-primary);
  background: none;
  border: none;
  cursor: pointer;
  transition: color var(--transition);
}
.accordion-trigger:hover { color: var(--accent); }
.accordion-trigger:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.accordion-trigger::after {
  content: '';
  flex-shrink: 0;
  width: 12px;
  height: 12px;
  margin-left: var(--space-2);
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform var(--transition);
}
.accordion-trigger[aria-expanded="true"]::after { transform: rotate(-135deg); }
.accordion-panel { overflow: hidden; height: 0; transition: height 0.25s ease; }
.accordion-panel[hidden] { display: block; height: 0; }
.accordion-panel p { padding: 0 0 var(--space-3); margin: 0; font-size: 0.9375rem; color: var(--text-secondary); }
.accordion-item h3 { margin: 0; }

.cta-section {
  text-align: center;
  padding: var(--space-6) 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}
.cta-section h2 { margin-bottom: var(--space-2); }
.cta-section .section-desc { margin-left: auto; margin-right: auto; margin-bottom: var(--space-4); }
.cta-buttons { display: flex; flex-wrap: wrap; gap: var(--space-2); justify-content: center; }

.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: var(--space-6) 0 0;
}
.footer-inner { display: grid; gap: var(--space-5); grid-template-columns: 1fr; padding-bottom: var(--space-5); }
@media (min-width: 768px) { .footer-inner { grid-template-columns: 1.2fr 2fr; } }
.footer-brand .logo { font-family: var(--font-heading); font-weight: 700; font-size: 1.125rem; color: var(--text-primary); margin-bottom: var(--space-2); }
.footer-brand .logo:hover { color: var(--text-primary); }
.footer-brand p { font-size: 0.9375rem; color: var(--text-muted); max-width: 36ch; margin: 0; }
.footer-nav { display: grid; gap: var(--space-4); grid-template-columns: repeat(2, 1fr); }
@media (min-width: 640px) { .footer-nav { grid-template-columns: repeat(3, 1fr); } }
.footer-col h4 { font-size: 0.8125rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-muted); margin: 0 0 var(--space-2); }
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin-bottom: var(--space-1); }
.footer-col a { color: var(--text-secondary); font-size: 0.9375rem; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom { padding: var(--space-3) 0; border-top: 1px solid var(--border); }
.footer-bottom .container { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-2); }
.copyright { font-size: 0.875rem; color: var(--text-muted); margin: 0; }
.footer-legal { display: flex; gap: var(--space-4); list-style: none; margin: 0; padding: 0; }
.footer-legal a { font-size: 0.875rem; color: var(--text-muted); }
.footer-legal a:hover { color: var(--text-secondary); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
}