/* AVA Pay — landing page
 * Visual language: matches parent AVA (ava.company).
 * White bg, near-black text, geometric sans, small-caps grey eyebrows,
 * alternating black inverse sections, thin grey dividers.
 */

:root {
  --bg: #ffffff;
  --fg: #0a0e14;
  --muted: #6b7280;
  --border: #e5e7eb;
  --inverse-bg: #0a0e14;
  --inverse-fg: #ffffff;
  --inverse-muted: #9ca3af;
  --inverse-border: #1f2430;
  --max-w: 1280px;
  --content-w: 1080px;
  --gutter: clamp(20px, 4vw, 48px);
  --section-y: clamp(80px, 12vw, 160px);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.55 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: 'cv11', 'ss01';
}

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url('https://rsms.me/inter/font-files/InterVariable.woff2') format('woff2-variations');
}

a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; }

code, pre {
  font-family: ui-monospace, 'JetBrains Mono', SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em;
}

/* ────────── Layout helpers ────────── */

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.inner {
  max-width: var(--content-w);
  margin: 0 auto;
}

section {
  padding: var(--section-y) 0;
  border-top: 1px solid var(--border);
}

section:first-of-type { border-top: none; }

.eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 24px;
}

h1, h2, h3, h4 {
  font-family: inherit;
  margin: 0;
  letter-spacing: -0.025em;
  color: var(--fg);
}

h1 {
  font-size: clamp(2.6rem, 6.2vw, 5rem);
  font-weight: 700;
  line-height: 1.02;
  max-width: 14ch;
}

h2 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.022em;
  max-width: 18ch;
}

h3 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.018em;
}

p { margin: 0 0 16px; }

.lede {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 56ch;
  margin: 24px 0 40px;
  line-height: 1.55;
}

/* ────────── Top nav ────────── */

.topnav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.topnav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.brand img {
  height: 28px;
  width: auto;
  display: block;
}

.brand .wordmark {
  font-weight: 700;
  letter-spacing: 0.01em;
}

.brand-sub {
  color: var(--muted);
  font-weight: 400;
  font-size: 0.92rem;
  letter-spacing: 0;
}

.navlinks {
  display: flex;
  gap: clamp(16px, 3vw, 36px);
  align-items: center;
  font-size: 0.95rem;
  color: var(--fg);
}

.navlinks a { color: var(--fg); }
.navlinks a:hover { color: var(--muted); text-decoration: none; }

/* ────────── Hero ────────── */

.hero {
  padding: clamp(72px, 11vw, 140px) 0 clamp(80px, 12vw, 160px);
  border-top: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: clamp(32px, 6vw, 96px);
  align-items: center;
}

.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-visual img {
  max-width: 100%;
  width: 360px;
  height: auto;
  display: block;
}

/* placeholder shield if logo file isn't dropped in yet */
.hero-visual .shield-placeholder {
  width: 280px;
  height: 320px;
  border: 2px solid var(--fg);
  border-radius: 24px 24px 80px 80px / 24px 24px 100px 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: 0.04em;
  text-align: center;
  padding: 24px;
  color: var(--fg);
}

@media (max-width: 800px) {
  .hero-grid { grid-template-columns: 1fr; gap: 56px; }
  .hero-visual img { width: 240px; }
}

/* ────────── Buttons ────────── */

.cta-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-weight: 600;
  font-size: 0.98rem;
  border-radius: 4px;
  border: 1.5px solid var(--fg);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  font-family: inherit;
  letter-spacing: -0.005em;
}

.btn.primary {
  background: var(--fg);
  color: var(--bg);
}

.btn.primary:hover {
  background: #1a1f2a;
  border-color: #1a1f2a;
  text-decoration: none;
}

.btn.secondary {
  background: transparent;
  color: var(--fg);
}

.btn.secondary:hover {
  background: var(--fg);
  color: var(--bg);
  text-decoration: none;
}

/* on inverse sections */
.inverse .btn {
  border-color: var(--inverse-fg);
  color: var(--inverse-fg);
}
.inverse .btn.primary {
  background: var(--inverse-fg);
  color: var(--inverse-bg);
}
.inverse .btn.primary:hover {
  background: #e5e7eb;
  border-color: #e5e7eb;
}
.inverse .btn.secondary:hover {
  background: var(--inverse-fg);
  color: var(--inverse-bg);
}

/* ────────── Inverse section ────────── */

.inverse {
  background: var(--inverse-bg);
  color: var(--inverse-fg);
  border-top: none;
}

.inverse .eyebrow { color: var(--inverse-muted); }
.inverse h1, .inverse h2, .inverse h3, .inverse h4 { color: var(--inverse-fg); }
.inverse .lede { color: var(--inverse-muted); }
.inverse a { color: var(--inverse-fg); }

/* full-bleed inverse: parent uses these between light sections */
.bleed-inverse {
  background: var(--inverse-bg);
  color: var(--inverse-fg);
  padding: var(--section-y) 0;
  border-top: none;
}

.bleed-inverse .eyebrow { color: var(--inverse-muted); }
.bleed-inverse h2, .bleed-inverse h3 { color: var(--inverse-fg); }
.bleed-inverse .lede { color: var(--inverse-muted); }

/* ────────── Demo section ────────── */

.demo-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: clamp(24px, 4vw, 40px);
  margin-top: 8px;
}

.protocol-toggle {
  display: flex;
  gap: 28px;
  margin-bottom: 28px;
  font-size: 0.95rem;
  flex-wrap: wrap;
}

.protocol-toggle label {
  cursor: pointer;
  user-select: none;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.protocol-toggle input[type="radio"] {
  accent-color: var(--fg);
  width: 16px;
  height: 16px;
  margin: 0;
}

.protocol-toggle label:has(input:checked) {
  color: var(--fg);
  font-weight: 500;
}

.demo-form {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 28px;
}

.demo-form label {
  display: flex;
  flex-direction: column;
  font-size: 0.7rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 500;
}

.demo-form input {
  margin-top: 8px;
  padding: 12px 14px;
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 1rem;
  font-family: inherit;
  letter-spacing: -0.005em;
}

.demo-form input:focus {
  outline: none;
  border-color: var(--fg);
}

.demo-output { margin-top: 36px; }
.demo-output .step { margin-top: 28px; }

.demo-output h4 {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin: 0 0 12px;
  font-weight: 500;
}

pre, .code-block {
  background: var(--inverse-bg);
  color: var(--inverse-fg);
  border: none;
  border-radius: 4px;
  padding: 20px;
  overflow-x: auto;
  white-space: pre;
  font-size: 0.85rem;
  line-height: 1.55;
}

.verdict-good {
  color: var(--inverse-fg);
  font-weight: 700;
  border-bottom: 2px solid var(--inverse-fg);
  padding-bottom: 2px;
}

.verdict-bad {
  color: #fca5a5;
  font-weight: 700;
}

/* ────────── Directory ────────── */

.directory-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0;
  border-top: 1px solid var(--border);
}

.dir-card {
  padding: 24px;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.dir-card h4 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.dir-card .agent-id {
  color: var(--muted);
  font-size: 0.78rem;
  word-break: break-all;
  font-family: ui-monospace, monospace;
}

.dir-card .protos {
  margin-top: 16px;
  font-size: 0.72rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.dir-card .protos span {
  display: inline-block;
  padding: 3px 10px;
  margin-right: 6px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-weight: 500;
  letter-spacing: 0.06em;
}

/* ────────── Product grid (For agents / For merchants) ────────── */

.product-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.product-cell {
  padding: clamp(40px, 6vw, 72px) clamp(28px, 4vw, 48px);
  border-right: 1px solid var(--border);
  position: relative;
}

.product-cell:last-child { border-right: none; }

.product-cell .num {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin-bottom: 28px;
}

.product-cell h3 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.product-cell p {
  color: var(--muted);
  margin-bottom: 24px;
}

.product-cell .meta {
  margin-top: 40px;
  border-top: 1px solid var(--border);
  padding-top: 20px;
  font-size: 0.85rem;
}

.product-cell .meta-row {
  margin-top: 12px;
}

.product-cell .meta-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
  font-weight: 500;
  margin-bottom: 4px;
}

.product-cell .meta-value {
  color: var(--fg);
  font-size: 0.92rem;
}

@media (max-width: 760px) {
  .product-grid { grid-template-columns: 1fr; }
  .product-cell { border-right: none; border-bottom: 1px solid var(--border); }
  .product-cell:last-child { border-bottom: none; }
}

/* ────────── Footer ────────── */

footer.site-footer {
  background: var(--inverse-bg);
  color: var(--inverse-fg);
  padding: clamp(64px, 9vw, 120px) 0 32px;
  border-top: none;
}

.footer-top {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

.footer-tagline {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--inverse-fg);
  max-width: 20ch;
}

.footer-contact .btn {
  background: transparent;
  color: var(--inverse-fg);
  border-color: var(--inverse-fg);
}
.footer-contact .btn:hover {
  background: var(--inverse-fg);
  color: var(--inverse-bg);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 32px;
  border-top: 1px solid var(--inverse-border);
  color: var(--inverse-muted);
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-bottom .brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--inverse-fg);
}

.footer-bottom .brand img {
  height: 28px;
  width: auto;
  display: block;
}

.footer-bottom a { color: var(--inverse-muted); }
.footer-bottom a:hover { color: var(--inverse-fg); text-decoration: none; }

.footer-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 12px;
  text-align: right;
}

.footer-meta-row {
  color: var(--inverse-muted);
}

.footer-parent-attr {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--inverse-muted) !important;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

.footer-parent-attr:hover { color: var(--inverse-fg) !important; }
.footer-parent-attr:hover .footer-parent-mark { opacity: 1; }

.footer-parent-label {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.7rem;
  font-weight: 500;
}

.footer-parent-mark {
  height: 22px;
  width: auto;
  display: block;
  opacity: 0.85;
  transition: opacity 0.15s ease;
}

@media (max-width: 640px) {
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .footer-meta { align-items: flex-start; text-align: left; }
}

/* ────────── Inline code (in prose) ────────── */

p code, li code {
  background: #f3f4f6;
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 1px 6px;
  font-size: 0.88em;
}

.inverse p code, .inverse li code,
.bleed-inverse p code, .bleed-inverse li code,
footer p code, footer li code {
  background: #1f2430;
  border-color: #2d3445;
  color: var(--inverse-fg);
}

/* ────────── Responsive tightening ────────── */

@media (max-width: 640px) {
  .topnav .wrap { height: 60px; }
  .navlinks { font-size: 0.88rem; gap: 14px; }
  .brand-sub { display: none; }
  .protocol-toggle { flex-direction: column; gap: 12px; }
}