/* ==========================================================================
   ChatThru — marketing & policy site
   Shared stylesheet. No build step, no external requests: drop it on GitHub
   Pages (or any static host) and it works.
   ========================================================================== */

:root {
  --ink: #07120e;
  --ink-2: #0c1a15;
  --surface: #10241d;
  --surface-2: #142c23;
  --line: #1e3a2f;
  --text: #e8f2ee;
  --muted: #9bb3ab;
  --muted-2: #6f8a81;
  --accent: #10b981;
  --accent-2: #34d399;
  --accent-deep: #059669;
  --warn: #fbbf24;
  --radius: 16px;
  --radius-sm: 10px;
  --max: 1120px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--ink);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* Subtle ambient glow behind the hero */
body::before {
  content: "";
  position: fixed;
  inset: -20% -10% auto -10%;
  height: 60vh;
  background:
    radial-gradient(60% 60% at 50% 0%, rgba(16, 185, 129, 0.16), transparent 70%),
    radial-gradient(40% 40% at 85% 10%, rgba(52, 211, 153, 0.09), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.wrap {
  position: relative;
  z-index: 1;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

/* --------------------------------------------------------------- navigation */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(7, 18, 14, 0.78);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 17px;
}

.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  background: linear-gradient(145deg, var(--accent), var(--accent-deep));
  color: #04120c;
  font-weight: 800;
  font-size: 14px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14.5px;
  font-weight: 500;
  transition: color 0.15s ease;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--text);
}

@media (max-width: 760px) {
  .nav-links {
    display: none;
  }
}

/* ------------------------------------------------------------------ buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 14.5px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.15s ease, border-color 0.15s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: linear-gradient(160deg, var(--accent-2), var(--accent-deep));
  color: #04120c;
  box-shadow: 0 8px 24px -10px rgba(16, 185, 129, 0.7);
}

.btn-primary:hover {
  background: linear-gradient(160deg, #4ade80, var(--accent));
}

.btn-ghost {
  border-color: var(--line);
  color: var(--text);
  background: rgba(255, 255, 255, 0.02);
}

.btn-ghost:hover {
  border-color: var(--muted-2);
  background: rgba(255, 255, 255, 0.05);
}

/* --------------------------------------------------------------------- hero */

.hero {
  padding: 88px 0 64px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(16, 185, 129, 0.08);
  color: var(--accent-2);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
  margin: 22px 0 0;
  font-weight: 700;
}

h1 .grad {
  background: linear-gradient(120deg, var(--accent-2), #a7f3d0 60%, var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede {
  margin: 20px 0 0;
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  color: var(--muted);
  max-width: 62ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.hero-note {
  margin-top: 16px;
  font-size: 13px;
  color: var(--muted-2);
}

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

.section {
  padding: 64px 0;
}

.section-head {
  max-width: 62ch;
  margin-bottom: 36px;
}

h2 {
  font-size: clamp(1.4rem, 2.6vw, 1.9rem);
  letter-spacing: -0.025em;
  margin: 0 0 10px;
  font-weight: 700;
}

.section-head p {
  color: var(--muted);
  margin: 0;
}

.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--surface), var(--ink-2));
  border-radius: var(--radius);
  padding: 22px;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 15.5px;
  letter-spacing: -0.01em;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
}

.card-icon {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  display: grid;
  place-items: center;
  margin-bottom: 14px;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.22);
  color: var(--accent-2);
  font-size: 16px;
}

/* ------------------------------------------------------------------- steps */

.steps {
  counter-reset: step;
  display: grid;
  gap: 14px;
}

.step {
  counter-increment: step;
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 16px;
  align-items: start;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-2);
}

.step::before {
  content: counter(step, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent-2);
  border: 1px solid rgba(16, 185, 129, 0.28);
  background: rgba(16, 185, 129, 0.08);
  border-radius: 8px;
  width: 34px;
  height: 30px;
  display: grid;
  place-items: center;
}

.step h3 {
  margin: 0 0 4px;
  font-size: 15px;
}

.step p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

/* -------------------------------------------------------------------- chips */

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 8px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  font-size: 13.5px;
  color: var(--text);
}

.chip .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

.chip.soon {
  color: var(--muted);
}

.chip.soon .dot {
  background: var(--muted-2);
}

/* --------------------------------------------------------------- policy page */

.page-head {
  padding: 64px 0 24px;
  border-bottom: 1px solid var(--line);
}

.page-head h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin-top: 14px;
}

.page-head .meta {
  color: var(--muted-2);
  font-size: 13.5px;
  margin-top: 14px;
  font-family: var(--mono);
}

.prose {
  max-width: 74ch;
  padding: 40px 0 72px;
}

.prose h2 {
  margin-top: 44px;
  font-size: 1.28rem;
}

.prose h3 {
  margin-top: 28px;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
}

.prose p,
.prose li {
  color: #cfe0da;
  font-size: 15.5px;
}

.prose li {
  margin-bottom: 8px;
}

.prose a {
  color: var(--accent-2);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.prose code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1px 5px;
}

.callout {
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  background: var(--ink-2);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  margin: 24px 0;
}

.callout p {
  margin: 0;
  font-size: 14.5px;
  color: var(--muted);
}

.toc {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-2);
  padding: 18px 22px;
  margin: 0 0 8px;
}

.toc h2 {
  margin: 0 0 10px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted-2);
}

.toc ol {
  margin: 0;
  padding-left: 20px;
  columns: 2;
  column-gap: 32px;
}

.toc li {
  font-size: 14px;
  margin-bottom: 4px;
}

.toc a {
  color: var(--muted);
  text-decoration: none;
}

.toc a:hover {
  color: var(--text);
}

@media (max-width: 620px) {
  .toc ol {
    columns: 1;
  }
}

/* ------------------------------------------------------------------- table */

table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 14.5px;
}

th,
td {
  text-align: left;
  padding: 11px 14px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

th {
  color: var(--muted-2);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

td {
  color: #cfe0da;
}

/* ------------------------------------------------------------------ footer */

.footer {
  border-top: 1px solid var(--line);
  padding: 40px 0 56px;
  margin-top: 24px;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: space-between;
  align-items: flex-start;
}

.footer p {
  color: var(--muted-2);
  font-size: 13px;
  margin: 6px 0 0;
  max-width: 44ch;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 13.5px;
}

.footer-links a:hover {
  color: var(--text);
}

/* ------------------------------------------------------------- accessibility */

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip {
  position: absolute;
  left: -9999px;
}

.skip:focus {
  left: 16px;
  top: 12px;
  background: var(--surface);
  color: var(--text);
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid var(--line);
  z-index: 100;
}

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

@media print {
  body {
    background: #fff;
    color: #111;
  }
  body::before,
  .nav,
  .footer {
    display: none;
  }
  .prose,
  .page-head {
    max-width: none;
  }
  .prose p,
  .prose li,
  .prose td {
    color: #111;
  }
}