/* =========================================================================
   Cerostaff — legal.cerostaff.com
   Shared stylesheet for index.html · privacy-policy.html · terms-of-service.html
   Self-contained: design tokens + components. No build, no JS framework.
   Typography: Inter (UI) + IBM Plex Mono (data) via Google Fonts.
   ========================================================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

/* -------------------------------------------------------------------------
   Tokens
   ------------------------------------------------------------------------- */
:root {
  /* Brand */
  --color-brand-sky:  #5BC0EB;
  --color-brand:      #1E5FBE;
  --color-brand-deep: #0B2A5B;
  --color-brand-ink:  #061A3D;
  --gradient-brand: linear-gradient(135deg, #5BC0EB 0%, #1E5FBE 55%, #0B2A5B 100%);
  --gradient-brand-radial: radial-gradient(60% 80% at 50% 0%, rgba(91,192,235,0.18) 0%, rgba(255,255,255,0) 70%);

  /* Neutrals */
  --color-bg:            #FFFFFF;
  --color-bg-muted:      #F5F7FA;
  --color-bg-sunken:     #EEF2F7;
  --color-border:        #E1E5EC;
  --color-border-strong: #C9D0DA;
  --color-fg:            #061A3D;
  --color-fg-muted:      #4A5568;
  --color-fg-subtle:     #7A8597;
  --color-fg-disabled:   #B1BAC7;

  /* Semantic */
  --color-success:    #22A06B;
  --color-success-bg: #E6F6EE;
  --color-info-bg:    #EAF1FB;
  --color-channel-whatsapp: #25D366;

  /* Type */
  --font-sans: 'Inter', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  /* Radius */
  --radius-md:  6px;
  --radius-lg:  8px;
  --radius-xl:  12px;
  --radius-2xl: 16px;
  --radius-pill: 999px;

  /* Spacing */
  --container-max: 1200px;
  --section-gap: 96px;

  /* Shadows */
  --shadow-card:
    rgba(11,42,91,0.04) 0 0 0 1px,
    rgba(11,42,91,0.04) 0 1px 2px 0,
    rgba(255,255,255,0.5) 0 0 0 1px inset;
  --shadow-md:
    rgba(11,42,91,0.05) 0 6px 18px -4px,
    rgba(11,42,91,0.04) 0 2px 6px -2px;
  --shadow-xl:
    rgba(11,42,91,0.03) 0 24px 40px -8px,
    rgba(11,42,91,0.04) 0 12px 20px -6px,
    rgba(11,42,91,0.03) 0 4px 8px -2px;
  --shadow-focus: 0 0 0 3px rgba(30,95,190,0.18);

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --dur-fast: 120ms;
  --dur-base: 200ms;
}

/* -------------------------------------------------------------------------
   Base
   ------------------------------------------------------------------------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: var(--color-fg);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
:focus-visible { outline: none; box-shadow: var(--shadow-focus); border-radius: 4px; }

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--color-brand);
  text-transform: uppercase;
  letter-spacing: 0.10em;
  margin: 0 0 14px;
}

/* -------------------------------------------------------------------------
   Buttons
   ------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 15px;
  letter-spacing: -0.01em;
  padding: 13px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
  white-space: nowrap;
}
.btn:active { transform: scale(0.99); }
.btn svg { width: 18px; height: 18px; }

.btn-primary {
  background: var(--color-brand);
  color: #fff;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.16), 0 1px 2px rgba(11,42,91,0.18);
}
.btn-primary:hover { background: var(--color-brand-deep); }

.btn-secondary {
  background: #fff;
  color: var(--color-fg);
  border-color: var(--color-border);
  box-shadow: var(--shadow-card);
}
.btn-secondary:hover { border-color: var(--color-border-strong); }

.btn-on-dark {
  background: #fff;
  color: var(--color-brand-ink);
}
.btn-on-dark:hover { background: var(--color-bg-muted); }

.btn-sm { padding: 9px 15px; font-size: 14px; }

/* -------------------------------------------------------------------------
   Header (shared, all 3 pages)
   ------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,0.78);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--color-border);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 64px;
}
.site-header .logo img { height: 26px; width: auto; }
.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.site-nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-fg-muted);
  transition: color var(--dur-fast) var(--ease-out);
}
.site-nav a:hover { color: var(--color-fg); }
.header-actions { display: flex; align-items: center; gap: 12px; }

/* mobile nav: collapse links, keep CTA */
@media (max-width: 820px) {
  .site-nav { display: none; }
}

/* -------------------------------------------------------------------------
   Footer (shared, all 3 pages)
   ------------------------------------------------------------------------- */
.site-footer {
  background: #fff;
  border-top: 1px solid var(--color-border);
  padding: 64px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-border);
}
.footer-brand img { height: 26px; width: auto; margin-bottom: 16px; }
.footer-brand p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-fg-muted);
  max-width: 320px;
  margin: 0;
}
.footer-legal-id {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-fg-subtle);
  margin-top: 16px;
  line-height: 1.7;
}
.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--color-fg-subtle);
  margin: 0 0 16px;
}
.footer-col a,
.footer-col span {
  display: block;
  font-size: 14px;
  color: var(--color-fg-muted);
  margin-top: 10px;
  transition: color var(--dur-fast) var(--ease-out);
}
.footer-col a:hover { color: var(--color-brand); }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  justify-content: space-between;
  padding-top: 24px;
  font-size: 12px;
  color: var(--color-fg-subtle);
}
@media (max-width: 760px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
}

/* -------------------------------------------------------------------------
   Landing — Hero
   ------------------------------------------------------------------------- */
.hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  padding: 80px 0 88px;
  text-align: center;
}
.hero-grid {
  position: absolute; inset: 0; z-index: -2;
  background-image: radial-gradient(circle at 1px 1px, rgba(11,42,91,0.16) 1px, transparent 0);
  background-size: 26px 26px;
  mask-image: radial-gradient(70% 80% at 50% 0%, #000 35%, transparent 78%);
  -webkit-mask-image: radial-gradient(70% 80% at 50% 0%, #000 35%, transparent 78%);
  opacity: 0.5;
}
.hero-halo {
  position: absolute; inset: -25% 0 auto 0; z-index: -1;
  height: 60vh; pointer-events: none;
  background: radial-gradient(55% 60% at 50% 0%, rgba(91,192,235,0.20) 0%, rgba(255,255,255,0) 65%);
}
.hero-inner { max-width: 760px; margin: 0 auto; }
.hero h1 {
  font-size: clamp(34px, 6vw, 60px);
  line-height: 1.04;
  letter-spacing: -0.035em;
  font-weight: 600;
  color: var(--color-brand-ink);
  margin: 0 0 22px;
  text-wrap: balance;
}
.hero h1 .accent {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub {
  font-size: clamp(17px, 2.4vw, 20px);
  line-height: 1.55;
  color: var(--color-fg-muted);
  margin: 0 auto 34px;
  max-width: 620px;
  text-wrap: pretty;
}
.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 28px;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  justify-content: center;
  font-size: 14px;
  color: var(--color-fg-subtle);
}
.hero-meta span { display: inline-flex; align-items: center; gap: 7px; }
.hero-meta svg { width: 15px; height: 15px; color: var(--color-success); }

/* -------------------------------------------------------------------------
   Landing — Channels strip
   ------------------------------------------------------------------------- */
.channels {
  padding: 44px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-muted);
}
.channels-label {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--color-fg-subtle);
  margin: 0 0 26px;
}
.channels-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}
.channel-tile {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 11px 18px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out);
}
.channel-tile:hover { transform: translateY(-1px); box-shadow: var(--shadow-md); }
.channel-tile img,
.channel-tile svg { width: 26px; height: 26px; object-fit: contain; }
.channel-tile span { font-size: 14px; font-weight: 500; color: var(--color-fg); }

/* -------------------------------------------------------------------------
   Generic section
   ------------------------------------------------------------------------- */
.section { padding: var(--section-gap) 0; }
.section-muted { background: var(--color-bg-muted); }
.section-head { max-width: 680px; margin: 0 auto 56px; text-align: center; }
.section-head h2 {
  font-size: clamp(28px, 4.4vw, 44px);
  line-height: 1.1;
  letter-spacing: -0.03em;
  font-weight: 600;
  color: var(--color-fg);
  margin: 0 0 16px;
  text-wrap: balance;
}
.section-head p {
  font-size: 18px;
  line-height: 1.55;
  color: var(--color-fg-muted);
  margin: 0;
  text-wrap: pretty;
}

/* -------------------------------------------------------------------------
   Landing — What it automates (feature grid)
   ------------------------------------------------------------------------- */
.auto-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.auto-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 28px 24px;
  box-shadow: var(--shadow-card);
  transition: transform var(--dur-base) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out);
}
.auto-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.auto-icon {
  width: 46px; height: 46px;
  display: flex; align-items: center; justify-content: center;
  background: var(--color-info-bg);
  color: var(--color-brand);
  border-radius: 10px;
  margin-bottom: 20px;
}
.auto-icon svg { width: 23px; height: 23px; }
.auto-card h3 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-fg);
  margin: 0 0 9px;
  text-wrap: balance;
}
.auto-card p {
  font-size: 14px;
  line-height: 1.55;
  color: var(--color-fg-muted);
  margin: 0;
}
@media (max-width: 960px) { .auto-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .auto-grid { grid-template-columns: 1fr; } }

/* -------------------------------------------------------------------------
   Landing — Network teaser
   ------------------------------------------------------------------------- */
.network {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: 56px 48px;
  box-shadow: var(--shadow-card);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.network .badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-brand);
  background: var(--color-info-bg);
  border-radius: var(--radius-pill);
  padding: 5px 12px;
  margin-bottom: 18px;
}
.network h2 {
  font-size: clamp(26px, 3.6vw, 36px);
  line-height: 1.12;
  letter-spacing: -0.03em;
  font-weight: 600;
  color: var(--color-fg);
  margin: 0 0 16px;
  text-wrap: balance;
}
.network p {
  font-size: 17px;
  line-height: 1.6;
  color: var(--color-fg-muted);
  margin: 0;
  text-wrap: pretty;
}
.network-visual {
  position: relative;
  aspect-ratio: 1 / 0.78;
  background: var(--color-bg-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
}
.network-node {
  position: absolute;
  width: 56px; height: 56px;
  border-radius: 50%;
  background: #fff;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-fg-subtle);
}
.network-node svg { width: 24px; height: 24px; }
.network-node.center {
  background: var(--color-brand);
  border-color: var(--color-brand);
  color: #fff;
  width: 66px; height: 66px;
  box-shadow: var(--shadow-md);
  z-index: 2;
}
.network-line { position: absolute; height: 1px; background: var(--color-border-strong); transform-origin: left center; z-index: 1; }
@media (max-width: 860px) {
  .network { grid-template-columns: 1fr; gap: 36px; padding: 40px 28px; }
  .network-visual { max-width: 420px; }
}

/* -------------------------------------------------------------------------
   Landing — final CTA banner
   ------------------------------------------------------------------------- */
.cta-banner-section { padding-bottom: var(--section-gap); }
.cta-banner {
  position: relative;
  background: var(--color-brand-ink);
  border-radius: var(--radius-2xl);
  padding: 72px 48px;
  overflow: hidden;
  isolation: isolate;
  text-align: center;
}
.cta-banner-glow {
  position: absolute; inset: 0; z-index: -1;
  background: var(--gradient-brand-radial),
              radial-gradient(60% 100% at 100% 100%, rgba(30,95,190,0.45) 0%, transparent 60%);
}
.cta-banner h2 {
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1.1;
  letter-spacing: -0.03em;
  font-weight: 600;
  color: #fff;
  margin: 0 auto 14px;
  max-width: 600px;
  text-wrap: balance;
}
.cta-banner p {
  font-size: 17px;
  line-height: 1.5;
  color: rgba(255,255,255,0.72);
  margin: 0 auto 30px;
  max-width: 520px;
}

/* -------------------------------------------------------------------------
   Legal pages (privacy-policy, terms-of-service)
   ------------------------------------------------------------------------- */
.legal-hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  background: var(--color-bg-muted);
  border-bottom: 1px solid var(--color-border);
  padding: 64px 0 56px;
}
.legal-hero .hero-halo { height: 40vh; }
.legal-hero h1 {
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1.08;
  letter-spacing: -0.03em;
  font-weight: 600;
  color: var(--color-brand-ink);
  margin: 0 0 14px;
  text-wrap: balance;
}
.legal-hero p {
  font-size: 17px;
  line-height: 1.55;
  color: var(--color-fg-muted);
  margin: 0;
  max-width: 640px;
}
.legal-updated {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-fg-subtle);
  margin-top: 20px;
}

.legal-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 56px;
  align-items: start;
  padding: 64px 0 88px;
}
.legal-toc {
  position: sticky;
  top: 88px;
  font-size: 13.5px;
}
.legal-toc h4 {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--color-fg-subtle);
  margin: 0 0 14px;
}
.legal-toc ol {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: toc;
  border-left: 1px solid var(--color-border);
}
.legal-toc li { margin: 0; }
.legal-toc a {
  display: block;
  padding: 6px 0 6px 16px;
  margin-left: -1px;
  border-left: 1px solid transparent;
  color: var(--color-fg-muted);
  line-height: 1.4;
  transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}
.legal-toc a:hover { color: var(--color-brand); border-left-color: var(--color-brand); }

.legal-body { max-width: 720px; }
.legal-intro {
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-fg-muted);
  margin: 0 0 12px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-border);
}
.legal-section { padding-top: 36px; }
.legal-section:first-of-type { padding-top: 8px; }
.legal-section h2 {
  font-size: 21px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-fg);
  margin: 0 0 14px;
  scroll-margin-top: 88px;
  display: flex;
  gap: 12px;
  align-items: baseline;
}
.legal-section h2 .num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-brand);
  flex-shrink: 0;
}
.legal-section h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-fg);
  margin: 24px 0 8px;
}
.legal-section p {
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--color-fg-muted);
  margin: 0 0 14px;
}
.legal-section ul {
  margin: 0 0 14px;
  padding-left: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.legal-section ul li {
  position: relative;
  padding-left: 26px;
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--color-fg-muted);
}
.legal-section ul li::before {
  content: "";
  position: absolute;
  left: 4px; top: 9px;
  width: 7px; height: 7px;
  border-radius: 2px;
  background: var(--color-brand-sky);
}
.legal-section ol {
  margin: 0 0 14px;
  padding-left: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.legal-section ol li {
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--color-fg-muted);
  padding-left: 6px;
}
.legal-section a { color: var(--color-brand); font-weight: 500; }
.legal-section a:hover { text-decoration: underline; }
.legal-section strong { color: var(--color-fg); font-weight: 600; }

/* Callout (data deletion, important notes) */
.legal-callout {
  background: var(--color-info-bg);
  border: 1px solid #D2E2F7;
  border-radius: var(--radius-xl);
  padding: 24px 26px;
  margin: 0 0 14px;
}
.legal-callout.is-note {
  background: var(--color-bg-muted);
  border-color: var(--color-border);
}
.legal-callout .callout-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
  font-weight: 600;
  font-size: 15px;
  color: var(--color-brand-ink);
}
.legal-callout .callout-head svg { width: 18px; height: 18px; color: var(--color-brand); }
.legal-callout p:last-child { margin-bottom: 0; }

.legal-contact-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
  padding: 24px 26px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-fg-muted);
}
.legal-contact-card strong { color: var(--color-fg); }

@media (max-width: 880px) {
  .legal-layout { grid-template-columns: 1fr; gap: 0; padding-top: 40px; }
  .legal-toc { display: none; }
}

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