/* Cognitience — monochrome liquid-glass site chrome */

:root {
  color-scheme: light;
  --lg-fill-heavy: rgba(246, 246, 248, 0.78);
  --lg-fill-medium: rgba(242, 242, 244, 0.7);
  --lg-fill-light: rgba(250, 250, 252, 0.62);
  --lg-blur-heavy: 48px;
  --lg-blur-medium: 32px;
  --lg-blur-light: 22px;
  --lg-sat: 100%;
  --lg-rim: rgba(255, 255, 255, 0.78);
  --lg-rim-soft: rgba(255, 255, 255, 0.42);
  --specular-x: 48%;
  --specular-y: 16%;
  --text: #1d1d1f;
  --text-secondary: rgba(0, 0, 0, 0.55);
  --accent: #1d1d1f;
  --accent-soft: rgba(0, 0, 0, 0.08);
  --accent-strong: #000000;
  --bg: #f5f5f7;
  --paper: #ffffff;
  --paper-text: #000000;
  --border: rgba(0, 0, 0, 0.1);
  --sep: rgba(0, 0, 0, 0.1);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.08), 0 2px 8px rgba(0, 0, 0, 0.05);
  --spring: cubic-bezier(0.32, 0.72, 0, 1);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --lg-fill-heavy: rgba(44, 44, 46, 0.82);
  --lg-fill-medium: rgba(38, 38, 40, 0.75);
  --lg-fill-light: rgba(50, 50, 52, 0.68);
  --lg-rim: rgba(255, 255, 255, 0.14);
  --lg-rim-soft: rgba(255, 255, 255, 0.1);
  --text: #f5f5f7;
  --text-secondary: rgba(255, 255, 255, 0.55);
  --accent: #f5f5f7;
  --accent-soft: rgba(255, 255, 255, 0.1);
  --accent-strong: #ffffff;
  --bg: #000000;
  --paper: #1c1c1e;
  --paper-text: #f5f5f7;
  --border: rgba(255, 255, 255, 0.12);
  --sep: rgba(255, 255, 255, 0.12);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.5), 0 2px 8px rgba(0, 0, 0, 0.4);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background 0.4s var(--spring), color 0.4s var(--spring);
}

/* Ambient backdrop so glass has something to refract */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(60% 50% at 20% 0%, rgba(128, 128, 128, 0.16), transparent 70%),
    radial-gradient(50% 40% at 85% 15%, rgba(128, 128, 128, 0.12), transparent 70%),
    radial-gradient(70% 60% at 50% 110%, rgba(128, 128, 128, 0.14), transparent 70%);
}

::selection { background: var(--accent); color: var(--bg); }

/* ---------- Liquid glass ---------- */

.liquid-glass {
  position: relative;
  isolation: isolate;
  background: var(--lg-fill-medium);
  -webkit-backdrop-filter: blur(var(--lg-blur-medium)) saturate(var(--lg-sat));
  backdrop-filter: blur(var(--lg-blur-medium)) saturate(var(--lg-sat));
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.liquid-glass::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow:
    inset 0 1px 0 var(--lg-rim),
    inset 0 -1px 0 var(--lg-rim-soft);
  pointer-events: none;
}

.liquid-glass::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(
    420px 240px at var(--specular-x) var(--specular-y),
    var(--lg-rim-soft), transparent 60%
  );
  opacity: 0.9;
  pointer-events: none;
}

.liquid-glass > * { position: relative; z-index: 1; }

.glass-heavy {
  background: var(--lg-fill-heavy);
  -webkit-backdrop-filter: blur(var(--lg-blur-heavy)) saturate(var(--lg-sat));
  backdrop-filter: blur(var(--lg-blur-heavy)) saturate(var(--lg-sat));
}

.glass-light {
  background: var(--lg-fill-light);
  -webkit-backdrop-filter: blur(var(--lg-blur-light)) saturate(var(--lg-sat));
  backdrop-filter: blur(var(--lg-blur-light)) saturate(var(--lg-sat));
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--lg-fill-heavy);
  -webkit-backdrop-filter: blur(var(--lg-blur-heavy)) saturate(var(--lg-sat));
  backdrop-filter: blur(var(--lg-blur-heavy)) saturate(var(--lg-sat));
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  object-fit: cover;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin-left: auto;
}

.main-nav a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  transition: color 0.25s var(--spring), background 0.25s var(--spring);
}

.main-nav a:hover { color: var(--text); background: var(--accent-soft); }
.main-nav a.active { color: var(--text); background: var(--accent-soft); }

.header-actions { display: flex; align-items: center; gap: 0.6rem; }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--lg-fill-light);
  -webkit-backdrop-filter: blur(var(--lg-blur-light)) saturate(var(--lg-sat));
  backdrop-filter: blur(var(--lg-blur-light)) saturate(var(--lg-sat));
  color: var(--text);
  cursor: pointer;
  transition: transform 0.25s var(--spring), background 0.25s var(--spring);
}

.icon-btn:hover { background: var(--accent-soft); }
.icon-btn:active { transform: scale(0.94); }
.icon-btn svg { width: 18px; height: 18px; fill: currentColor; }

.social-links { display: flex; align-items: center; gap: 0.5rem; }
.social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  transition: color 0.25s var(--spring), background 0.25s var(--spring), transform 0.25s var(--spring);
}
.social-links a:hover { color: var(--text); background: var(--accent-soft); }
.social-links a:active { transform: scale(0.94); }
.social-links svg { width: 18px; height: 18px; fill: currentColor; }

/* ---------- Hero ---------- */

.hero {
  max-width: 1120px;
  margin: 0 auto;
  padding: 5.5rem 1.5rem 3.5rem;
  text-align: center;
}

.hero img.hero-logo {
  width: 108px;
  height: 108px;
  border-radius: 26px;
  object-fit: cover;
  box-shadow: var(--shadow);
  margin-bottom: 1.75rem;
}

.hero h1 {
  font-size: clamp(2.4rem, 5.5vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.08;
  margin-bottom: 1.1rem;
}

.hero p.lede {
  max-width: 640px;
  margin: 0 auto 2rem;
  font-size: 1.2rem;
  color: var(--text-secondary);
}

.hero-cta { display: flex; gap: 0.8rem; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: transform 0.25s var(--spring), background 0.25s var(--spring), color 0.25s var(--spring);
}

.btn:active { transform: scale(0.96); }

.btn-primary { background: var(--accent-strong); color: var(--bg); border-color: transparent; }
html[data-theme="dark"] .btn-primary { color: #000; }
.btn-primary:hover { opacity: 0.88; }

.btn-ghost {
  background: var(--lg-fill-light);
  -webkit-backdrop-filter: blur(var(--lg-blur-light)) saturate(var(--lg-sat));
  backdrop-filter: blur(var(--lg-blur-light)) saturate(var(--lg-sat));
  color: var(--text);
}
.btn-ghost:hover { background: var(--accent-soft); }

/* ---------- Sections ---------- */

.section { max-width: 1120px; margin: 0 auto; padding: 3.5rem 1.5rem; }

.section-head { text-align: center; margin-bottom: 2.75rem; }
.section-head h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 750;
  letter-spacing: -0.03em;
  margin-bottom: 0.6rem;
}
.section-head p { color: var(--text-secondary); max-width: 560px; margin: 0 auto; font-size: 1.05rem; }

/* ---------- Download cards ---------- */

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

.app-card {
  padding: 2rem;
  border-radius: 24px;
  display: flex;
  flex-direction: column;
  transition: transform 0.35s var(--spring), box-shadow 0.35s var(--spring);
}

.app-card:hover { transform: translateY(-4px); }

.app-card .app-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  object-fit: cover;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow);
}

/* Per-app brand tint glowing through the frosted card */
.card-wp { --app-tint: rgba(64, 132, 255, 0.16); }
.card-ss { --app-tint: rgba(52, 199, 89, 0.16); }
.card-pp { --app-tint: rgba(235, 87, 87, 0.16); }

.app-card { background-image: radial-gradient(130% 65% at 50% 0%, var(--app-tint, transparent), transparent 70%); }

.card-wp .version-pill { background: rgba(64, 132, 255, 0.18); color: var(--text); }
.card-ss .version-pill { background: rgba(52, 199, 89, 0.18); color: var(--text); }
.card-pp .version-pill { background: rgba(235, 87, 87, 0.18); color: var(--text); }

.app-card h3 { font-size: 1.4rem; font-weight: 700; letter-spacing: -0.02em; }
.app-card .app-tagline { color: var(--text-secondary); font-size: 0.95rem; margin: 0.35rem 0 1rem; }

.app-meta {
  list-style: none;
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.app-meta li { display: flex; gap: 0.5rem; }
.app-meta li::before { content: "·"; color: var(--text-secondary); }

.app-card .btn { margin-top: auto; justify-content: center; }

.platform-downloads {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  margin-top: auto;
}

.platform-btn {
  width: 100%;
  justify-content: flex-start;
  gap: 0.75rem;
  border-radius: 14px;
  padding: 0.7rem 1rem;
}

.platform-btn span {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.2;
  font-size: 0.95rem;
}

.platform-btn small {
  font-size: 0.72rem;
  font-weight: 500;
  opacity: 0.65;
}

.platform-logo {
  width: 22px;
  height: 22px;
  object-fit: contain;
  flex-shrink: 0;
  /* Black silhouettes → readable on both themes */
  filter: invert(0);
  opacity: 0.9;
}

html[data-theme="dark"] .platform-logo {
  filter: invert(1);
}

html[data-theme="dark"] .btn-primary .platform-logo {
  filter: invert(0);
}

html:not([data-theme="dark"]) .btn-primary .platform-logo {
  filter: invert(1);
}

.app-card .version-pill {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--text-secondary);
  margin-left: 0.5rem;
  vertical-align: middle;
}

/* ---------- Feature pillars ---------- */

.pillars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.pillar {
  padding: 2rem;
  border-radius: 24px;
}

.pillar h3 { font-size: 1.15rem; font-weight: 700; margin: 1rem 0 0.5rem; letter-spacing: -0.01em; }
.pillar p { color: var(--text-secondary); font-size: 0.95rem; }

.pillar .pillar-icon {
  width: 44px;
  height: 44px;
  border-radius: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-soft);
}
.pillar .pillar-icon svg { width: 22px; height: 22px; fill: var(--text); }

/* ---------- Statement band ---------- */

.statement {
  max-width: 820px;
  margin: 0 auto;
  padding: 3rem 1.5rem 4.5rem;
  text-align: center;
}
.statement blockquote {
  font-size: clamp(1.3rem, 2.8vw, 1.9rem);
  font-weight: 650;
  letter-spacing: -0.02em;
  line-height: 1.35;
}
.statement cite {
  display: block;
  margin-top: 1rem;
  font-style: normal;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* ---------- Blog ---------- */

.blog-list { display: flex; flex-direction: column; gap: 1.5rem; max-width: 820px; margin: 0 auto; }

.post {
  padding: 2rem 2.25rem;
  border-radius: 24px;
}

.post .post-meta {
  font-size: 0.82rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  margin-bottom: 0.6rem;
}

.post h2, .post h3 {
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.6rem;
  line-height: 1.25;
}
.post h2 { font-size: 1.55rem; }
.post h3 { font-size: 1.15rem; margin-top: 1.4rem; }

.post-title-icon { display: flex; align-items: center; gap: 0.7rem; }
.post-icon {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  object-fit: cover;
  flex-shrink: 0;
}

.post p { color: var(--text-secondary); font-size: 0.98rem; margin-bottom: 0.9rem; }
.post p:last-child { margin-bottom: 0; }
.post ul { color: var(--text-secondary); font-size: 0.98rem; margin: 0 0 0.9rem 1.2rem; }
.post li { margin-bottom: 0.35rem; }
.post strong { color: var(--text); }
.post a { color: var(--text); }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--lg-fill-medium);
  -webkit-backdrop-filter: blur(var(--lg-blur-medium)) saturate(var(--lg-sat));
  backdrop-filter: blur(var(--lg-blur-medium)) saturate(var(--lg-sat));
  margin-top: 3rem;
}

.footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-brand { display: flex; align-items: center; gap: 0.6rem; font-weight: 600; }
.footer-brand img { width: 26px; height: 26px; border-radius: 7px; object-fit: cover; }
.footer-note { font-size: 0.85rem; color: var(--text-secondary); }

/* ---------- Motion ---------- */

@keyframes rise {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

.rise { animation: rise 0.8s var(--spring) both; }
.rise-1 { animation-delay: 0.08s; }
.rise-2 { animation-delay: 0.16s; }
.rise-3 { animation-delay: 0.24s; }

/* ---------- Responsive ---------- */

@media (max-width: 760px) {
  .header-inner { gap: 0.75rem; }
  .brand span { display: none; }
  .hero { padding-top: 3.5rem; }
  .social-links-header { display: none; }
}

/* ---------- Accessibility fallbacks ---------- */

@media (prefers-reduced-transparency: reduce) {
  .liquid-glass, .site-header, .site-footer, .icon-btn, .btn-ghost {
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    background: var(--paper);
  }
  .liquid-glass::after { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}

@media (prefers-contrast: more) {
  :root { --border: rgba(0, 0, 0, 0.35); }
  html[data-theme="dark"] { --border: rgba(255, 255, 255, 0.4); }
}

@media print {
  .site-header, .site-footer, .hero-cta, .btn { display: none !important; }
  body { background: #fff; color: #000; }
}