/* =============================================================
   LLCAI Labs — Shared stylesheet
   ============================================================= */

/* -- Design tokens -------------------------------------------- */
:root {
  /* Brand */
  --brand-primary: #2563eb;          /* LLCAI Labs blue */
  --brand-primary-dark: #1e50c8;
  --brand-accent: #38c7c0;           /* Water Sort teal — accent */
  --brand-warm: #f59e0b;            /* Warm callout */

  /* Surfaces */
  --bg: #ffffff;
  --bg-soft: #f8fafc;
  --bg-card: #ffffff;
  --bg-elevated: #ffffff;

  /* Text */
  --ink: #0f172a;                   /* primary text (slate-900) */
  --ink-muted: #475569;             /* secondary text (slate-600) */
  --ink-subtle: #94a3b8;            /* tertiary (slate-400) */

  /* Lines + chips */
  --border: #e2e8f0;                /* slate-200 */
  --border-strong: #cbd5e1;         /* slate-300 */

  /* States */
  --success: #16a34a;
  --warn: #d97706;

  /* Radii */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;
  --r-pill: 999px;

  /* Spacing scale (8pt) */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 24px;
  --s-6: 32px;
  --s-7: 48px;
  --s-8: 64px;

  /* Type */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue",
               Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code",
               "JetBrains Mono", Consolas, monospace;
}

/* -- Reset / base ---------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--s-3);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(1.9rem, 3.6vw, 2.6rem); }
h2 { font-size: clamp(1.4rem, 2.4vw, 1.8rem); }
h3 { font-size: clamp(1.15rem, 1.8vw, 1.35rem); }
p  { margin: 0 0 var(--s-4); }

a {
  color: var(--brand-primary);
  text-decoration: none;
}
a:hover { color: var(--brand-primary-dark); text-decoration: underline; }

img, svg { max-width: 100%; height: auto; display: block; }

ul, ol { padding-left: 1.25rem; margin: 0 0 var(--s-4); }

code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--bg-soft);
  padding: 1px 6px;
  border-radius: var(--r-sm);
}

/* -- Layout containers ------------------------------------------ */
.container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 var(--s-5);
}
.container--narrow { max-width: 760px; }
.container--prose  { max-width: 720px; }

/* -- Skip link (accessibility) --------------------------------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--brand-primary);
  color: #fff;
  padding: var(--s-3) var(--s-4);
  z-index: 100;
}
.skip-link:focus { left: 0; }

/* -- Site header / nav ----------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 50;
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-5);
  height: 64px;
}
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  font-weight: 700;
  color: var(--ink);
}
.site-brand__mark {
  width: 28px; height: 28px;
  display: inline-block;
}
.site-brand:hover { color: var(--brand-primary); text-decoration: none; }
.site-nav {
  display: flex;
  gap: var(--s-5);
  align-items: center;
}
.site-nav a {
  color: var(--ink-muted);
  font-weight: 500;
  padding: var(--s-2) 0;
}
.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--brand-primary);
  text-decoration: none;
}

/* -- Hero (home) ----------------------------------------------- */
.hero {
  padding: var(--s-8) 0 var(--s-7);
  background:
    radial-gradient(1100px 500px at 12% -10%, rgba(56,199,192,0.18), transparent 60%),
    radial-gradient(900px  420px at 100% 0%, rgba(37,99,235,0.18), transparent 60%),
    var(--bg-soft);
  border-bottom: 1px solid var(--border);
}
.hero__inner { text-align: left; max-width: 760px; }
.hero__eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--brand-primary);
  background: rgba(37,99,235,0.10);
  border: 1px solid rgba(37,99,235,0.25);
  padding: 4px 12px;
  border-radius: var(--r-pill);
  margin-bottom: var(--s-4);
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}
.hero__lead {
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  color: var(--ink-muted);
  max-width: 60ch;
}
.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-3);
  margin-top: var(--s-5);
}

/* -- Buttons --------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-2);
  padding: 10px 18px;
  border-radius: var(--r-md);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  line-height: 1.2;
  transition: background 120ms ease, color 120ms ease, border-color 120ms ease;
}
.btn--primary {
  background: var(--brand-primary);
  color: #fff;
}
.btn--primary:hover {
  background: var(--brand-primary-dark);
  color: #fff;
  text-decoration: none;
}
.btn--secondary {
  background: #fff;
  color: var(--ink);
  border-color: var(--border-strong);
}
.btn--secondary:hover {
  border-color: var(--brand-primary);
  color: var(--brand-primary);
  text-decoration: none;
}
.btn--ghost {
  background: transparent;
  color: var(--brand-primary);
}
.btn--ghost:hover { text-decoration: underline; }
.btn--lg { padding: 14px 22px; font-size: 1rem; }
.btn[aria-disabled="true"],
.btn.is-disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

/* -- Section --------------------------------------------------- */
.section {
  padding: var(--s-7) 0;
  border-bottom: 1px solid var(--border);
}
.section:last-of-type { border-bottom: 0; }
.section__title {
  margin-bottom: var(--s-2);
}
.section__lead {
  color: var(--ink-muted);
  margin-bottom: var(--s-5);
  max-width: 60ch;
}

/* -- App cards grid ------------------------------------------ */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--s-5);
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--s-5);
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  transition: transform 150ms ease, border-color 150ms ease, box-shadow 150ms ease;
}
.card:hover {
  border-color: var(--border-strong);
  box-shadow: 0 4px 16px rgba(15,23,42,0.06);
}
.card__head {
  display: flex;
  align-items: center;
  gap: var(--s-3);
}
.card__icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 1.4rem;
  flex-shrink: 0;
}
.card__title {
  margin: 0;
  font-size: 1.1rem;
  line-height: 1.3;
}
.card__category {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--ink-muted);
  margin-top: 2px;
}
.card__desc {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.95rem;
  flex: 1 1 auto;
}
.card__actions {
  display: flex;
  gap: var(--s-2);
  flex-wrap: wrap;
  margin-top: auto;
}

/* -- "Coming Soon" badge ------------------------------------- */
.badge-soon {
  display: inline-block;
  background: var(--bg-soft);
  color: var(--ink-muted);
  border: 1px dashed var(--border-strong);
  padding: 2px 10px;
  border-radius: var(--r-pill);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* -- Page header (used on sub-pages) ------------------------- */
.page-header {
  padding: var(--s-7) 0 var(--s-5);
  background: var(--bg-soft);
  border-bottom: 1px solid var(--border);
}
.page-header h1 { font-size: clamp(1.7rem, 3.4vw, 2.4rem); }
.page-header__lead { color: var(--ink-muted); max-width: 60ch; }

/* -- Prose (legal text) -------------------------------------- */
.prose { padding: var(--s-7) 0; }
.prose h2 {
  font-size: 1.2rem;
  margin-top: var(--s-6);
  padding-top: var(--s-4);
  border-top: 1px solid var(--border);
}
.prose h2:first-of-type { border-top: 0; margin-top: 0; padding-top: 0; }
.prose p, .prose li { font-size: 0.97rem; color: var(--ink); }
.prose li { margin-bottom: var(--s-2); }

/* -- Contact list ------------------------------------------- */
.contact-list {
  display: grid;
  gap: var(--s-4);
  margin-top: var(--s-5);
}
.contact-item {
  display: flex;
  gap: var(--s-3);
  padding: var(--s-4);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-card);
}
.contact-item__icon {
  width: 36px; height: 36px;
  border-radius: var(--r-sm);
  background: var(--bg-soft);
  display: grid; place-items: center;
  font-weight: 700;
  color: var(--brand-primary);
  flex-shrink: 0;
}
.contact-item__body { font-size: 0.95rem; color: var(--ink-muted); }
.contact-item__body strong { color: var(--ink); }

/* -- Site footer --------------------------------------------- */
.site-footer {
  background: var(--bg-soft);
  border-top: 1px solid var(--border);
  padding: var(--s-6) 0;
  color: var(--ink-muted);
  font-size: 0.9rem;
}
.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-4);
  justify-content: space-between;
  align-items: center;
}
.site-footer a { color: var(--ink-muted); }
.site-footer a:hover { color: var(--brand-primary); }
.site-footer__nav {
  display: flex;
  gap: var(--s-4);
  flex-wrap: wrap;
}

/* -- Mobile ---------------------------------------------------- */
@media (max-width: 720px) {
  .site-header__inner { height: 56px; gap: var(--s-3); }
  .site-nav { gap: var(--s-3); font-size: 0.9rem; }
  .site-nav a { padding: var(--s-2) 0; }
  .hero { padding: var(--s-7) 0 var(--s-6); }
  .hero__cta { flex-direction: column; align-items: stretch; }
  .hero__cta .btn { width: 100%; }
  .section { padding: var(--s-6) 0; }
  .site-footer__inner { flex-direction: column; align-items: flex-start; gap: var(--s-3); }
  .cards { grid-template-columns: 1fr; }
}

@media (max-width: 420px) {
  .site-brand__name { display: none; } /* keep just the mark */
  .card { padding: var(--s-4); }
  .card__icon { width: 48px; height: 48px; font-size: 1.2rem; }
}

/* -- CTA box (inline-promoted card) ---------------------------- */
.cta-box {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--s-5) var(--s-5);
  margin: var(--s-5) 0;
  text-align: center;
}
.cta-box p { margin: 0 0 var(--s-2); }
.cta-box p:last-child { margin-bottom: 0; }
.cta-box__lead { color: var(--ink-muted); font-size: 0.9rem; }

/* -- Inline-info list (used in app detail pages) -------------- */
.app-info {
  list-style: none;
  padding: 0;
  margin: var(--s-4) 0;
}
.app-info li {
  display: flex;
  justify-content: space-between;
  gap: var(--s-3);
  padding: var(--s-2) 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
}
.app-info li:last-child { border-bottom: 0; }
.app-info strong { color: var(--ink); }

/* -- Reduced motion -------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}

/* -- Print ----------------------------------------------------- */
@media print {
  .site-header, .site-footer, .hero__cta { display: none; }
  body { color: #000; background: #fff; }
  a { color: #000; text-decoration: underline; }
}

/* -- Focus visible -------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--brand-primary);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}