/**
 * OnlineAIIDE SEO Landing Pages Stylesheet
 * High-performance, zero-dependency, responsive styling
 */

:root {
  color-scheme: dark;
  --bg-primary: #0a0f1d;
  --bg-secondary: #111a2e;
  --bg-card: rgba(18, 27, 47, 0.85);
  --bg-card-hover: rgba(26, 38, 66, 0.95);
  --border-color: #23334d;
  --border-hover: #3b5278;
  --text-primary: #f0f4fc;
  --text-secondary: #9cb1d1;
  --text-muted: #6f85a8;
  --accent: #3b82f6;
  --accent-light: #60a5fa;
  --accent-glow: rgba(59, 130, 246, 0.18);
  --accent-green: #10b981;
  --accent-purple: #8b5cf6;
  --code-bg: #0d1527;
  --font-sans: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  --container-max: 1200px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
}

@media (prefers-color-scheme: light) {
  :root.theme-auto {
    color-scheme: light;
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --bg-card: rgba(255, 255, 255, 0.95);
    --bg-card-hover: #ffffff;
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --accent: #2563eb;
    --accent-light: #1d4ed8;
    --accent-glow: rgba(37, 99, 235, 0.12);
    --code-bg: #f8fafc;
  }
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, var(--accent-glow), transparent),
    radial-gradient(circle at 100% 100%, rgba(139, 92, 246, 0.08), transparent 40%);
  color: var(--text-primary);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent-light);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover, a:focus-visible {
  color: #bfdbfe;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 15, 29, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.85rem 0;
}

.header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  text-decoration: none;
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  object-fit: contain;
}

.brand-text {
  background: linear-gradient(135deg, #ffffff 40%, var(--accent-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.02em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.site-nav a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius-sm);
  transition: color 0.2s, background 0.2s;
}

.site-nav a:hover, .site-nav a:focus-visible {
  color: var(--text-primary);
  background: var(--accent-glow);
  text-decoration: none;
}

.nav-cta {
  background: var(--accent);
  color: #ffffff !important;
  font-weight: 600 !important;
  padding: 0.5rem 1.1rem !important;
  border-radius: var(--radius-md) !important;
  box-shadow: 0 2px 10px rgba(59, 130, 246, 0.35);
  transition: transform 0.15s ease, background 0.2s, box-shadow 0.2s !important;
}

.nav-cta:hover, .nav-cta:focus-visible {
  background: var(--accent-light) !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.45);
}

/* Breadcrumbs */
.breadcrumbs {
  max-width: var(--container-max);
  margin: 1.25rem auto 0;
  padding: 0 1.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
}

.breadcrumbs li:not(:last-child)::after {
  content: "/";
  margin-left: 0.5rem;
  color: var(--border-hover);
}

.breadcrumbs a {
  color: var(--text-secondary);
}

/* Main Layout */
main {
  flex: 1;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 1.5rem 1.5rem 4rem;
  width: 100%;
}

/* Hero Section */
.hero {
  padding: 3rem 0 3.5rem;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  background: var(--accent-glow);
  border: 1px solid rgba(59, 130, 246, 0.35);
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-light);
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero h1 {
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.03em;
  color: #ffffff;
  margin-bottom: 1.25rem;
}

.hero-description {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 2.25rem;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  background: linear-gradient(135deg, var(--accent) 0%, #2563eb 100%);
  color: #ffffff;
  font-weight: 600;
  font-size: 1.05rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.4);
  transition: transform 0.15s ease, box-shadow 0.2s ease;
  text-decoration: none;
}

.btn-primary:hover, .btn-primary:focus-visible {
  color: #ffffff;
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(37, 99, 235, 0.5);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  background: var(--bg-card);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1.05rem;
  padding: 0.85rem 1.65rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  transition: background 0.2s, border-color 0.2s, transform 0.15s;
  text-decoration: none;
}

.btn-secondary:hover, .btn-secondary:focus-visible {
  color: #ffffff;
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  text-decoration: none;
  transform: translateY(-2px);
}

/* Sections */
.section-block {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(35, 51, 77, 0.5);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 2.5rem;
}

.section-header h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  color: #ffffff;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

/* Card Grids */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  backdrop-filter: blur(8px);
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--border-hover);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.card-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--accent-glow);
  color: var(--accent-light);
  font-size: 1.4rem;
  margin-bottom: 1.25rem;
}

.card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 0.65rem;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.card ul {
  margin-top: 0.85rem;
  padding-left: 1.25rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.card li {
  margin-bottom: 0.35rem;
}

/* Code & Workflow Showcase */
.code-showcase {
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.45);
  margin-top: 1.5rem;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  background: rgba(14, 21, 38, 0.95);
  border-bottom: 1px solid var(--border-color);
}

.code-dots {
  display: flex;
  gap: 0.4rem;
}

.code-dots span {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: #334155;
}

.code-dots span:nth-child(1) { background: #ef4444; }
.code-dots span:nth-child(2) { background: #eab308; }
.code-dots span:nth-child(3) { background: #22c55e; }

.code-filename {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.code-badge {
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  background: var(--accent-glow);
  color: var(--accent-light);
  font-weight: 600;
  font-family: var(--font-mono);
}

pre {
  margin: 0;
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1.65;
  color: #e2e8f0;
}

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

/* Specs & Limitations Table */
.spec-table-wrapper {
  overflow-x: auto;
  margin-top: 1.5rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
}

table.spec-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

table.spec-table th, table.spec-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

table.spec-table th {
  background: rgba(14, 21, 38, 0.8);
  color: #ffffff;
  font-weight: 600;
  letter-spacing: 0.02em;
}

table.spec-table tr:last-child td {
  border-bottom: none;
}

table.spec-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.badge-tag {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--accent-glow);
  color: var(--accent-light);
}

.badge-green {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-green);
}

/* FAQ Accordions */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 840px;
  margin: 0 auto;
}

details.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  transition: border-color 0.2s ease, background 0.2s ease;
}

details.faq-item[open] {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

summary.faq-question {
  cursor: pointer;
  font-weight: 600;
  font-size: 1.08rem;
  color: #ffffff;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

summary.faq-question::-webkit-details-marker {
  display: none;
}

summary.faq-question::after {
  content: "+";
  font-size: 1.4rem;
  color: var(--accent-light);
  transition: transform 0.2s ease;
  line-height: 1;
}

details.faq-item[open] summary.faq-question::after {
  content: "−";
  transform: rotate(180deg);
}

.faq-answer {
  margin-top: 0.85rem;
  padding-top: 0.85rem;
  border-top: 1px solid rgba(35, 51, 77, 0.5);
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.65;
}

/* Related Tools & Interlinking */
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.related-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  text-decoration: none;
  transition: transform 0.15s, border-color 0.2s;
}

.related-card:hover, .related-card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--accent-light);
  text-decoration: none;
}

.related-card h4 {
  color: #ffffff;
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.related-card p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.5;
}

/* CTA Banner */
.cta-banner {
  margin-top: 5rem;
  padding: 3.5rem 2rem;
  background:
    radial-gradient(ellipse 60% 80% at 50% 50%, rgba(59, 130, 246, 0.22), transparent 70%),
    linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  color: #ffffff;
  font-weight: 800;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.cta-banner p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 620px;
  margin: 0 auto 2rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-color);
  background: #080c17;
  padding: 3rem 0 2rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2.5rem;
}

.footer-col h5 {
  color: #ffffff;
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-col a {
  color: var(--text-secondary);
  font-size: 0.88rem;
}

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

.footer-bottom {
  max-width: var(--container-max);
  margin: 2.5rem auto 0;
  padding: 1.5rem 1.5rem 0;
  border-top: 1px solid rgba(35, 51, 77, 0.4);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.85rem;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .site-header .header-inner {
    flex-wrap: wrap;
  }
  .site-nav {
    gap: 0.75rem;
    font-size: 0.85rem;
  }
  .hero {
    padding: 2rem 0;
  }
  .cards-grid {
    grid-template-columns: 1fr;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
}