/* Landing page — StableApps.ai (light theme matching apps' public shell) */
:root {
  --c-bg:           #f7f8fb;
  --c-bg-elev:      #ffffff;
  --c-bg-elev-2:    #f1f4f9;
  --c-bg-hover:     #eef1f6;

  --c-border:       #e4e8ef;
  --c-border-hi:    #cdd3dd;

  --c-text:         #0f172a;
  --c-text-2:       #475569;
  --c-text-3:       #94a3b2;

  --c-primary:      #6366f1;
  --c-primary-hi:   #4f46e5;
  --c-primary-faint:rgba(99,102,241,0.10);
  --c-primary-line: rgba(99,102,241,0.25);

  --c-success:      #16a34a;

  --shadow-sm:  0 1px 2px rgba(15,23,42,.04), 0 1px 3px rgba(15,23,42,.05);
  --shadow:     0 4px 14px rgba(15,23,42,.06), 0 1px 2px rgba(15,23,42,.03);
  --shadow-lg:  0 16px 40px rgba(15,23,42,.10), 0 2px 6px rgba(15,23,42,.04);

  --r-sm: 6px;
  --r:    10px;
  --r-lg: 14px;

  --t-fast: 120ms ease;
  --t:      180ms ease;

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, Roboto, 'Helvetica Neue', Arial, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.55;
  font-size: 14.5px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ---------- Topbar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 32px;
  background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(160%) blur(8px);
  -webkit-backdrop-filter: saturate(160%) blur(8px);
  border-bottom: 1px solid var(--c-border);
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 17px; letter-spacing: -0.01em;
  color: var(--c-text);
}
.brand-logo {
  height: 36px; border-radius: 7px;
  object-fit: contain; display: block; flex-shrink: 0;
}
.brand-text span { color: var(--c-primary-hi); }
.topnav { display: flex; align-items: center; gap: 22px; }
.topnav a { color: var(--c-text-2); font-size: 14px; transition: color var(--t-fast); }
.topnav a:hover { color: var(--c-text); }

.btn-primary, .btn-ghost {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; border-radius: var(--r);
  font-size: 14px; font-weight: 600;
  border: 1px solid transparent;
  transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast), box-shadow var(--t-fast), transform 60ms ease;
  cursor: pointer; line-height: 1; white-space: nowrap;
}
.btn-primary {
  background: var(--c-primary); color: #fff;
}
.btn-primary:hover { background: var(--c-primary-hi); box-shadow: var(--shadow-sm); }
.btn-primary:active { transform: translateY(1px); }
.btn-ghost {
  background: var(--c-bg-elev); color: var(--c-text);
  border-color: var(--c-border-hi);
}
.btn-ghost:hover { background: var(--c-bg-hover); border-color: var(--c-text-3); }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  padding: 110px 32px 84px;
  text-align: center;
}
.hero-inner { position: relative; z-index: 2; max-width: 880px; margin: 0 auto; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 6px;
  margin-bottom: 22px;
  padding: 5px 12px; border-radius: 999px;
  background: var(--c-primary-faint);
  color: var(--c-primary-hi);
  border: 1px solid var(--c-primary-line);
  font-size: 12px; font-weight: 600;
  letter-spacing: 0.01em;
}
.hero h1 {
  margin: 0; font-size: clamp(36px, 6vw, 60px);
  line-height: 1.06; letter-spacing: -0.025em; font-weight: 800;
  color: var(--c-text);
}
.hero h1 .accent {
  background: linear-gradient(90deg, var(--c-primary), var(--c-primary-hi));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero .lead {
  margin: 22px auto 32px;
  max-width: 660px;
  color: var(--c-text-2);
  font-size: 18px;
}
.hero-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero-glow {
  position: absolute; inset: 0; pointer-events: none; z-index: 1;
  background:
    radial-gradient(700px 320px at 30% 20%, rgba(99,102,241,.12), transparent 60%),
    radial-gradient(600px 300px at 70% 30%, rgba(139,92,246,.10), transparent 60%);
}

/* ---------- Section heads ---------- */
.section-head { text-align: center; margin: 0 auto 44px; max-width: 760px; padding: 0 20px; }
.section-head h2 {
  margin: 0 0 10px; font-size: clamp(26px, 4vw, 36px);
  font-weight: 800; letter-spacing: -0.02em; color: var(--c-text);
}
.section-head p { margin: 0; color: var(--c-text-2); font-size: 16px; }

/* ---------- Apps grid ---------- */
.apps-section { padding: 72px 32px; }
.apps-grid {
  max-width: 1180px; margin: 0 auto;
  display: grid; gap: 20px;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}
.loading-row {
  grid-column: 1 / -1;
  display: flex; align-items: center; justify-content: center; gap: 12px;
  padding: 60px 0; color: var(--c-text-2);
}
.spinner {
  width: 18px; height: 18px; border-radius: 50%;
  border: 2px solid var(--c-border); border-top-color: var(--c-primary);
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.app-card {
  position: relative; display: flex; flex-direction: column;
  padding: 22px 22px 18px;
  background: var(--c-bg-elev);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--t), border-color var(--t), box-shadow var(--t);
  overflow: hidden;
}
.app-card:hover {
  transform: translateY(-3px);
  border-color: var(--c-primary-line);
  box-shadow: var(--shadow);
}
.app-card::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0;
  width: 3px; background: var(--app-accent, var(--c-primary));
  opacity: .9;
}
.app-card-head { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }
.app-logo {
  width: 44px; height: 44px; border-radius: 10px;
  background: var(--app-accent, var(--c-primary));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; font-size: 16px; letter-spacing: -0.01em;
  box-shadow: 0 4px 12px rgba(15,23,42,.10);
}
.app-name { margin: 0; font-size: 17px; font-weight: 700; letter-spacing: -0.01em; color: var(--c-text); }
.app-domain { margin-top: 2px; font-size: 12px; color: var(--c-text-3); font-family: ui-monospace, 'SF Mono', Menlo, monospace; }
.app-desc {
  margin: 0 0 16px; color: var(--c-text-2); font-size: 14px; line-height: 1.55;
  flex: 1;
}
.app-card-foot {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid var(--c-border);
}
.app-status {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; color: var(--c-success); font-weight: 600;
}
.app-status .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--c-success);
  box-shadow: 0 0 0 3px rgba(22,163,74,.15);
}
.app-cta {
  font-size: 13px; color: var(--c-primary-hi); font-weight: 600;
  display: inline-flex; align-items: center; gap: 6px;
  transition: gap var(--t-fast);
}
.app-card:hover .app-cta { gap: 10px; }

.empty-row {
  grid-column: 1 / -1;
  text-align: center; padding: 60px 20px;
  color: var(--c-text-2); border: 1px dashed var(--c-border); border-radius: var(--r-lg);
  background: var(--c-bg-elev);
}

/* ---------- Why section ---------- */
.why-section {
  padding: 72px 32px;
  background: var(--c-bg-elev);
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
}
.why-inner { max-width: 1180px; margin: 0 auto; }
.why-inner h2 {
  text-align: center; margin: 0 0 44px;
  font-size: clamp(26px, 4vw, 36px); font-weight: 800; letter-spacing: -0.02em;
  color: var(--c-text);
}
.features {
  display: grid; gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.feature {
  padding: 26px;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  transition: transform var(--t), border-color var(--t), box-shadow var(--t);
}
.feature:hover {
  transform: translateY(-2px);
  border-color: var(--c-primary-line);
  box-shadow: var(--shadow-sm);
}
.feature-icon {
  width: 42px; height: 42px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  background: var(--c-primary-faint); color: var(--c-primary-hi);
  font-size: 17px; margin-bottom: 14px;
}
.feature h3 { margin: 0 0 6px; font-size: 16px; font-weight: 700; color: var(--c-text); letter-spacing: -0.01em; }
.feature p { margin: 0; color: var(--c-text-2); font-size: 14px; }

/* ---------- Contact ---------- */
.contact-section { padding: 96px 32px; text-align: center; }
.contact-inner { max-width: 600px; margin: 0 auto; }
.contact-inner h2 {
  margin: 0 0 12px; font-size: clamp(26px, 4vw, 36px);
  font-weight: 800; letter-spacing: -0.02em; color: var(--c-text);
}
.contact-inner p { margin: 0 0 26px; color: var(--c-text-2); font-size: 16px; }

/* ---------- Footer ---------- */
.footer {
  margin-top: auto;
  padding: 24px 32px;
  border-top: 1px solid var(--c-border);
  background: var(--c-bg-elev);
}
.footer-inner {
  max-width: 1180px; margin: 0 auto;
  display: flex; align-items: center; justify-content: center; gap: 12px;
  color: var(--c-text-3); font-size: 13px;
}
.footer-inner a { color: var(--c-text-2); transition: color var(--t-fast); }
.footer-inner a:hover { color: var(--c-text); }
.footer-sep { opacity: .5; }

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .topbar { padding: 12px 18px; }
  .topnav { gap: 14px; }
  .topnav a:not(.btn-ghost) { display: none; }
  .hero { padding: 72px 18px 56px; }
  .apps-section, .why-section, .contact-section { padding: 56px 18px; }
}