/* base.css — GPUHosted design system (Vercel/Stripe tier) */

/* ─── SCROLL REVEAL ─────────────────────────────────────────────────────── */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.55s ease, transform 0.55s ease; }
.reveal.revealed { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }

.container { max-width: 1200px; margin: 0 auto; padding: 0 var(--space-6); }
.container-sm { max-width: 800px; margin: 0 auto; padding: 0 var(--space-6); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

/* ─── FOCUS STYLES (WCAG 2.4.7) ────────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 3px;
}
:focus:not(:focus-visible) { outline: none; }

/* Skip to main content */
.skip-link {
  position: absolute; top: -48px; left: 16px; z-index: 9999;
  background: var(--color-primary); color: white;
  padding: 8px 16px; border-radius: var(--radius-md);
  font-size: 0.875rem; font-weight: 600;
  text-decoration: none; transition: top 0.2s;
}
.skip-link:focus { top: 16px; }

/* ─── TRUST BAR ────────────────────────────────────────────────────────── */
.trust-bar {
  background: var(--color-primary-light);
  border-bottom: 1px solid var(--color-primary-border);
  padding: 10px 0;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: background var(--transition-slow);
}
.trust-bar .container {
  display: flex; align-items: center; gap: var(--space-5);
  flex-wrap: wrap; justify-content: center;
}
.trust-item {
  display: flex; align-items: center; gap: 6px;
  white-space: nowrap;
}
.trust-item svg { flex-shrink: 0; color: var(--color-primary); }

/* ─── SITE HEADER ──────────────────────────────────────────────────────── */
.site-header {
  background: var(--color-bg-overlay);
  border-bottom: 1px solid var(--color-border);
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  transition: background var(--transition-slow), border-color var(--transition-slow);
}
/* Top gradient accent line */
.site-header::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px; gap: var(--space-4);
}
.brand {
  display: flex; align-items: center; gap: var(--space-3);
  font-weight: 800; font-size: 1.1rem;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.025em;
  flex-shrink: 0;
  transition: opacity var(--transition-fast);
}
.brand:hover { opacity: 0.8; color: var(--color-text); }
.brand-logo {
  width: 32px; height: 32px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}
.brand-logo svg { width: 18px; height: 18px; color: white; }

/* Desktop nav */
.nav-desktop {
  display: flex; align-items: center; gap: 2px;
  flex: 1; justify-content: center;
}
.nav-desktop a {
  color: var(--color-text-muted);
  font-size: 0.875rem; font-weight: 500;
  padding: 6px 12px; border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}
.nav-desktop a:hover { color: var(--color-text); background: var(--color-bg-alt); }
.nav-desktop a.active { color: var(--color-primary); }

/* Header right actions */
.header-actions {
  display: flex; align-items: center; gap: var(--space-2);
  flex-shrink: 0;
}

/* Theme toggle button */
.theme-toggle {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
  flex-shrink: 0;
}
.theme-toggle:hover { color: var(--color-text); border-color: var(--color-border-strong); }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle .icon-sun,
@media (prefers-color-scheme: dark) { .theme-toggle .icon-sun } { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon,
@media (prefers-color-scheme: dark) { .theme-toggle .icon-moon } { display: none; }

.header-cta {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--color-primary);
  color: white !important;
  font-weight: 600; font-size: 0.875rem;
  padding: 8px 16px; border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  white-space: nowrap; text-decoration: none;
}
.header-cta:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column; justify-content: center; align-items: center;
  width: 36px; height: 36px;
  background: none; border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer; gap: 4px;
  transition: border-color var(--transition-fast);
}
.hamburger:hover { border-color: var(--color-border-strong); }
.hamburger span {
  display: block; width: 16px; height: 1.5px;
  background: var(--color-text-muted);
  border-radius: 2px;
  transition: all var(--transition-base);
}
.hamburger[aria-expanded="true"] span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.hamburger[aria-expanded="true"] span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

/* Mobile menu drawer */
.mobile-menu {
  display: none;
  position: fixed; top: 102px; left: 0; right: 0; bottom: 0;
  background: var(--color-bg);
  z-index: 99;
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  flex-direction: column; gap: var(--space-1);
  overflow-y: auto;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  color: var(--color-text);
  font-size: 1rem; font-weight: 500;
  padding: 14px 16px; border-radius: var(--radius-md);
  display: flex; align-items: center; gap: var(--space-3);
  text-decoration: none;
  transition: background var(--transition-fast);
}
.mobile-menu a:hover { background: var(--color-bg-alt); }
.mobile-menu a:last-child {
  margin-top: var(--space-2);
  background: var(--color-primary);
  color: white;
  justify-content: center;
}
.mobile-menu a:last-child:hover { background: var(--color-primary-hover); }

@media (max-width: 768px) {
  .nav-desktop { display: none; }
  .hamburger { display: flex; }
}

/* ─── BREADCRUMBS ──────────────────────────────────────────────────────── */
.breadcrumbs {
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-alt);
}
.breadcrumbs nav {
  display: flex; align-items: center; gap: 6px;
  font-size: 0.8125rem; color: var(--color-text-subtle);
  flex-wrap: wrap;
}
.breadcrumbs a { color: var(--color-text-subtle); transition: color var(--transition-fast); }
.breadcrumbs a:hover { color: var(--color-primary); }
.breadcrumbs .crumb-sep { opacity: 0.4; }
.breadcrumbs .crumb-current { color: var(--color-text-muted); font-weight: 500; }

/* ─── BUTTONS ──────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-weight: 600; font-size: 0.9375rem;
  text-decoration: none;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  cursor: pointer; white-space: nowrap;
  line-height: 1.4;
  font-family: var(--font-body);
}
.btn-sm { padding: 7px 14px; font-size: 0.8125rem; border-radius: var(--radius-sm); }
.btn-lg { padding: 14px 28px; font-size: 1.0625rem; border-radius: var(--radius-lg); }

.btn-primary {
  background: linear-gradient(135deg, #4F46E5 0%, #6366F1 100%);
  color: white;
  box-shadow: 0 2px 8px rgba(79,70,229,0.35), 0 1px 2px rgba(79,70,229,0.2), inset 0 1px 0 rgba(255,255,255,0.12);
}
.btn-primary:hover {
  background: linear-gradient(135deg, #4338CA 0%, #4F46E5 100%); color: white;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(79,70,229,0.45), 0 2px 6px rgba(79,70,229,0.25), inset 0 1px 0 rgba(255,255,255,0.12);
}
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text-muted);
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-xs);
}
.btn-secondary:hover {
  color: var(--color-text);
  border-color: var(--color-border-accent);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary-border);
}
.btn-ghost:hover { background: var(--color-primary-light); color: var(--color-primary); }

/* ─── CARDS ────────────────────────────────────────────────────────────── */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}
.card:hover {
  border-color: var(--color-border-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.card-interactive {
  cursor: pointer; text-decoration: none;
  display: block; color: var(--color-text);
}

/* ─── COMPARISON TABLE ─────────────────────────────────────────────────── */
.comparison-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-bg-card);
  box-shadow: var(--shadow-sm);
}
.comparison-table {
  width: 100%; border-collapse: collapse; min-width: 680px;
}
.comparison-table th,
.comparison-table td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}
.comparison-table thead th {
  background: var(--color-bg-alt);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase; letter-spacing: 0.07em;
  color: var(--color-text-subtle); font-weight: 500;
  position: sticky; top: 0;
}
.comparison-table tbody tr { transition: background var(--transition-fast); }
.comparison-table tbody tr:hover { background: var(--color-bg-alt); }
.comparison-table tbody tr:last-child td,
.comparison-table tbody tr:last-child th { border-bottom: none; }
.comparison-table tbody tr.featured {
  background: var(--color-primary-light);
}
.comparison-table tbody tr.featured:hover {
  background: var(--color-primary-light);
  filter: brightness(1.03);
}
.comparison-table .product-name {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; min-width: 140px; color: var(--color-text);
}
.comparison-table .badge {
  display: inline-flex; align-items: center;
  background: var(--color-primary); color: white;
  padding: 2px 8px; border-radius: var(--radius-full);
  font-family: var(--font-mono); font-size: 0.625rem; font-weight: 700;
  letter-spacing: 0.03em; white-space: nowrap;
}
.comparison-table .stars { color: #f59e0b; letter-spacing: 1px; font-size: 0.85rem; }
.comparison-table .rating-num {
  margin-left: 4px; font-family: var(--font-mono);
  font-size: 0.875rem; color: var(--color-text-muted);
}
.comparison-table .price {
  font-family: var(--font-mono); font-weight: 600;
  color: var(--color-primary); font-size: 0.9375rem; white-space: nowrap;
}
.comparison-table .pros ul { margin: 0; padding-left: 1rem; }
.comparison-table .pros li { font-size: 0.8125rem; margin-bottom: 2px; color: var(--color-text-muted); }
.comparison-table .cta { white-space: nowrap; }
.comparison-table .btn { font-size: 0.8125rem; padding: 7px 14px; border-radius: var(--radius-sm); }

/* ─── FAQ ──────────────────────────────────────────────────────────────── */
.faq { margin: 2.5rem 0; }
.faq > h2 { margin-bottom: 1.5rem; }
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 8px;
  background: var(--color-bg-card);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.faq-item:hover { border-color: var(--color-border-strong); }
.faq-item[open] { border-color: var(--color-primary-border); box-shadow: var(--shadow-sm); }
.faq-item summary {
  padding: 16px 20px;
  cursor: pointer; font-weight: 600;
  color: var(--color-text);
  list-style: none;
  display: flex; justify-content: space-between; align-items: center;
  gap: var(--space-4); font-size: 0.9375rem;
  transition: color var(--transition-fast);
  user-select: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item:hover summary { color: var(--color-primary); }
.faq-item[open] summary { color: var(--color-primary); }
.faq-toggle-icon {
  width: 20px; height: 20px; flex-shrink: 0;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 1rem; font-weight: 400;
  color: var(--color-primary); line-height: 1;
  transition: all var(--transition-fast);
}
.faq-item[open] .faq-toggle-icon { background: var(--color-primary); color: white; border-color: var(--color-primary); }
.faq-answer {
  padding: 0 20px 18px;
  color: var(--color-text-muted); line-height: 1.75;
  font-size: 0.9375rem;
}
.faq-answer p { margin: 0; }

/* ─── HERO (article pages) ─────────────────────────────────────────────── */
.page-hero {
  padding: 56px 0 48px;
  background: linear-gradient(180deg, var(--color-primary-light) 0%, transparent 100%);
  border-bottom: 1px solid var(--color-border);
  text-align: center;
}
.page-hero .eyebrow {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: 0.75rem; font-weight: 600;
  color: var(--color-primary); letter-spacing: 0.08em;
  text-transform: uppercase; margin-bottom: 16px;
}
.page-hero .eyebrow::before { content: '//'; opacity: 0.5; }
.page-hero h1 {
  font-size: clamp(1.875rem, 4vw, 2.75rem);
  max-width: 680px; margin: 0 auto 16px;
}
.page-hero .lead {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  max-width: 600px; margin: 0 auto;
  line-height: 1.7;
}

/* ─── SECTION HEADERS ──────────────────────────────────────────────────── */
.section-header { text-align: center; margin-bottom: var(--space-10); }
.section-label {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: 0.6875rem; font-weight: 600;
  color: var(--color-primary); text-transform: uppercase; letter-spacing: 0.1em;
  margin-bottom: var(--space-3);
}
.section-label::before { content: '//'; opacity: 0.5; }
.section-header h2 { margin-bottom: var(--space-3); }
.section-header p { color: var(--color-text-muted); font-size: 1.0625rem; margin: 0; }

/* ─── DISCLOSURE ───────────────────────────────────────────────────────── */
.disclosure {
  display: flex; align-items: flex-start; gap: 10px;
  background: var(--color-warning-bg);
  border: 1px solid rgba(217,119,6,0.2);
  border-radius: var(--radius-md);
  padding: 12px 16px; font-size: 0.8125rem;
  color: var(--color-warning); margin-bottom: var(--space-6);
}
.disclosure svg { flex-shrink: 0; margin-top: 1px; }

/* ─── PROSE ─────────────────────────────────────────────────────────────── */
.prose { line-height: 1.75; }
.prose p { margin: 0 0 1.25rem; color: var(--color-text-muted); }
.prose h2 { margin: 2.5rem 0 1rem; color: var(--color-text); }
.prose h3 { margin: 2rem 0 0.75rem; color: var(--color-text); }
.prose ul, .prose ol { padding-left: 1.5rem; margin: 0 0 1.25rem; }
.prose li { margin-bottom: 0.4rem; color: var(--color-text-muted); }
.prose a { color: var(--color-primary); text-decoration: underline; text-underline-offset: 2px; }
.prose code {
  font-family: var(--font-mono); font-size: 0.875em;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  padding: 1px 5px; border-radius: var(--radius-xs);
  color: var(--color-accent);
}
.prose strong { color: var(--color-text); font-weight: 600; }

/* ─── SITE FOOTER ──────────────────────────────────────────────────────── */
.site-footer {
  background: #0a0f1e;
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 64px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.footer-brand { max-width: 240px; }
.footer-brand-name {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 1rem; font-weight: 800; letter-spacing: -0.025em;
  color: #fff; text-decoration: none; margin-bottom: 12px;
}
.footer-brand-name:hover { color: #e0e7ff; }
.footer-brand-logo {
  width: 28px; height: 28px;
  background: linear-gradient(135deg, #4F46E5, #06B6D4);
  border-radius: 7px; display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.footer-brand-logo svg { width: 15px; height: 15px; color: white; }
.footer-tagline {
  font-size: 0.8125rem; color: rgba(255,255,255,0.42);
  line-height: 1.65; margin-bottom: 20px; max-width: 220px;
}
.footer-social { display: flex; gap: 8px; }
.social-icon {
  width: 32px; height: 32px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.09);
  border-radius: 8px; color: rgba(255,255,255,0.45);
  display: flex; align-items: center; justify-content: center;
  text-decoration: none; transition: background 200ms, color 200ms, border-color 200ms;
}
.social-icon svg { width: 15px; height: 15px; }
.social-icon:hover { background: rgba(79,70,229,0.25); border-color: rgba(99,102,241,0.4); color: #a5b4fc; }
.footer-col h4 {
  font-size: 0.6875rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.1em;
  color: rgba(255,255,255,0.32); margin-bottom: 16px;
}
.footer-col nav { display: flex; flex-direction: column; gap: 10px; }
.footer-col nav a {
  font-size: 0.875rem; color: rgba(255,255,255,0.48);
  text-decoration: none; transition: color 150ms;
}
.footer-col nav a:hover { color: #fff; }
.footer-bottom {
  padding: 20px 0;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 12px;
}
.footer-copy { font-size: 0.75rem; color: rgba(255,255,255,0.28); margin: 0; }
.footer-ai-row { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.footer-ai-label { font-size: 0.6875rem; color: rgba(255,255,255,0.25); white-space: nowrap; }
.footer-ai-chip {
  font-size: 0.6875rem; color: rgba(255,255,255,0.38);
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 20px; padding: 2px 8px;
  text-decoration: none;
  transition: color 0.15s, border-color 0.15s;
}
a.footer-ai-chip:hover { color: rgba(255,255,255,0.65); border-color: rgba(255,255,255,0.2); }

/* ─── CHIP / TAG ───────────────────────────────────────────────────────── */
.chip {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 9px; border-radius: var(--radius-full);
  font-size: 0.6875rem; font-weight: 600; font-family: var(--font-mono);
  border: 1px solid;
}
.chip-primary { background: var(--color-primary-light); color: var(--color-primary); border-color: var(--color-primary-border); }
.chip-accent { background: var(--color-accent-light); color: var(--color-accent); border-color: rgba(6,182,212,0.25); }
.chip-neutral { background: var(--color-bg-elevated); color: var(--color-text-muted); border-color: var(--color-border-strong); }

/* ─── STATUS BADGE ─────────────────────────────────────────────────────── */
.status-dot {
  display: inline-block; width: 8px; height: 8px;
  border-radius: 50%; flex-shrink: 0;
}
.status-dot.green { background: var(--color-success); box-shadow: 0 0 0 3px var(--color-success-bg); }
.status-dot.amber { background: var(--color-warning); }
.status-dot.red { background: var(--color-danger); }

/* ─── RESPONSIVE ───────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .container { padding: 0 var(--space-4); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-brand { grid-column: 1 / -1; max-width: 100%; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  h1 { letter-spacing: -0.03em; }
}
@media (max-width: 480px) {
  .btn-lg { padding: 12px 20px; font-size: 1rem; }
  .comparison-table-wrap { border-radius: var(--radius-md); }
}