/* Open Gauge — marketing landing page
   Design tokens mirror apps/web/src/app/globals.css (.dark palette). */

@font-face {
  font-family: "Geist";
  src: url("assets/fonts/GeistVF.woff") format("woff");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Geist Mono";
  src: url("assets/fonts/GeistMonoVF.woff") format("woff");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

:root {
  color-scheme: light;

  /* Open Gauge brand palette — light mode (mirrors apps/web globals.css :root) */
  --og-bg: #ffffff;
  --og-surface: #ffffff;
  --og-surface-alt: #f9fafb;
  --og-border: #f1f4f6;
  --og-border-md: #e3e8ec;
  --og-text: #152330;
  --og-muted: #5b7280;
  --og-faint: #8b9aa5;
  --og-accent: #2f819b;
  --og-accent-dark: #256a81;
  --og-accent-rgb: 47, 129, 155;
  --og-action: #1b4f64;
  --og-action-dark: #154050;
  --og-grid-color: rgba(47, 129, 155, 0.08);
  --og-nav-bg: rgba(255, 255, 255, 0.82);

  --og-green: #059669;
  --og-green-rgb: 5, 150, 105;
  --og-amber: #b45309;
  --og-amber-rgb: 180, 83, 9;
  --og-red: #dc2626;
  --og-red-rgb: 220, 38, 38;
  --og-number: #b45309;

  --shadow-card: 0 1px 2px rgba(16, 24, 32, 0.04), 0 12px 28px -18px rgba(16, 24, 32, 0.16);

  --radius-lg: 0.9rem;
  --radius-md: 0.6rem;
  --container: 1120px;
}

html.dark {
  color-scheme: dark;

  /* Open Gauge brand palette — dark mode */
  --og-bg: #080f16;
  --og-surface: #0f1c26;
  --og-surface-alt: #0b1620;
  --og-border: #1a2e3d;
  --og-border-md: #1e3a52;
  --og-text: #d0e8f0;
  --og-muted: #8fa8b5;
  --og-faint: #5f7885;
  --og-accent: #3d9ab8;
  --og-accent-dark: #2f819b;
  --og-accent-rgb: 61, 154, 184;
  --og-action: #256a81;
  --og-action-dark: #1b5f72;
  --og-grid-color: rgba(61, 154, 184, 0.07);
  --og-nav-bg: rgba(8, 15, 22, 0.82);

  --og-green: #34d399;
  --og-green-rgb: 52, 211, 153;
  --og-amber: #fbbf24;
  --og-amber-rgb: 251, 191, 36;
  --og-red: #f87171;
  --og-red-rgb: 248, 113, 113;
  --og-number: #f0b46e;

  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 32px -16px rgba(0, 0, 0, 0.5);
}

/* Theme-affected surfaces transition smoothly instead of flashing */
body,
.nav,
.card,
.stack-layer,
.mockup,
.mockup-info-card,
.mockup-panel,
.terminal,
.api-code,
.badge,
.pill,
.btn,
.icon-badge {
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--og-bg);
  color: var(--og-text);
  font-family: "Geist", Arial, Helvetica, sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
}

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

code, pre, .mono {
  font-family: "Geist Mono", "Courier New", monospace;
}

.wrap {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.og-grid-bg {
  background-image:
    linear-gradient(var(--og-grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--og-grid-color) 1px, transparent 1px);
  background-size: 48px 48px;
}

section {
  position: relative;
}

/* ---------------------------------------------------------------- nav */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--og-nav-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--og-border);
}

.nav .wrap {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
}

.brand-logo {
  height: 50px;
  width: auto;
}

/* Logo/icon assets that only exist in one color — swap by theme instead of
   shipping a recolored duplicate. */
.logo-for-dark,
.icon-sun {
  display: none;
}

.logo-for-light,
.icon-moon {
  display: block;
}

html.dark .logo-for-dark {
  display: block;
}

html.dark .logo-for-light {
  display: none;
}

html.dark .icon-sun {
  display: block;
}

html.dark .icon-moon {
  display: none;
}

.icon-github {
  display: inline-block;
  width: 15px;
  height: 15px;
  flex: none;
  background-color: currentColor;
  -webkit-mask-image: url("assets/github.svg");
  mask-image: url("assets/github.svg");
  -webkit-mask-size: contain;
  mask-size: contain;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-position: center;
  mask-position: center;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  flex: none;
  background: none;
  border: 1px solid var(--og-border-md);
  border-radius: var(--radius-md);
  color: var(--og-text);
  cursor: pointer;
}

.theme-toggle:hover {
  background: var(--og-surface);
}

.theme-toggle svg {
  width: 16px;
  height: 16px;
}

.brand .sep {
  color: var(--og-faint);
  font-weight: 400;
  margin-left: 0.3rem;
  padding-left: 0.6rem;
  border-left: 1px solid var(--og-border-md);
  font-size: 0.8rem;
  letter-spacing: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-size: 0.875rem;
  color: var(--og-muted);
  transition: color 0.15s ease;
}

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

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

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--og-border-md);
  border-radius: var(--radius-md);
  color: var(--og-text);
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}

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

.btn-primary {
  background: var(--og-action);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--og-action-dark);
}

.btn-ghost {
  border-color: var(--og-border-md);
  color: var(--og-text);
  background: transparent;
}

.btn-ghost:hover {
  background: var(--og-surface);
}

.btn-quiet {
  color: var(--og-muted);
  padding-left: 0.25rem;
  padding-right: 0.25rem;
}

.btn-quiet:hover {
  color: var(--og-text);
}

.btn svg {
  width: 15px;
  height: 15px;
  flex: none;
}

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

.hero {
  padding: 5.5rem 0 4rem;
  text-align: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--og-accent);
  background: rgba(var(--og-accent-rgb), 0.1);
  border: 1px solid rgba(var(--og-accent-rgb), 0.25);
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  margin-bottom: 1.5rem;
}

.badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--og-accent);
}

.hero h1 {
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 1.1rem;
  font-weight: 700;
}

.hero h1 .accent {
  color: var(--og-accent);
}

.hero p.lead {
  max-width: 620px;
  margin: 0 auto 2rem;
  color: var(--og-muted);
  font-size: 1.05rem;
}

.hero-ctas {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.hero-ctas .btn {
  padding: 0.75rem 1.3rem;
  font-size: 0.9rem;
}

/* ---------------------------------------------------------------- terminal */

.terminal {
  max-width: 620px;
  margin: 0 auto 3rem;
  background: var(--og-surface);
  border: 1px solid var(--og-border);
  border-radius: var(--radius-md);
  text-align: left;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.terminal-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.55rem 0.9rem;
  border-bottom: 1px solid var(--og-border);
}

.terminal-dots {
  display: flex;
  gap: 6px;
}

.terminal-dots span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--og-border-md);
}

.copy-btn {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.7rem;
  color: var(--og-faint);
  background: none;
  border: none;
  cursor: pointer;
}

.copy-btn:hover {
  color: var(--og-accent);
}

.copy-btn svg {
  width: 12px;
  height: 12px;
}

.terminal pre {
  margin: 0;
  padding: 1rem 1.1rem 1.15rem;
  font-size: 0.82rem;
  color: var(--og-text);
  overflow-x: auto;
}

.terminal .prompt {
  color: var(--og-faint);
  user-select: none;
}

/* ---------------------------------------------------------------- app mockup */

.mockup {
  max-width: 900px;
  margin: 0 auto;
  background: var(--og-surface);
  border: 1px solid var(--og-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 1px 2px rgba(0,0,0,0.4), 0 30px 60px -20px rgba(0,0,0,0.6);
  text-align: left;
}

.mockup-bar {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--og-border);
  background: var(--og-surface-alt);
}

.mockup-dots {
  display: flex;
  gap: 6px;
}

.mockup-dots span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.mockup-dots span:nth-child(1) { background: #f87171; }
.mockup-dots span:nth-child(2) { background: #fbbf24; }
.mockup-dots span:nth-child(3) { background: #34d399; }

.mockup-url {
  font-size: 0.72rem;
  color: var(--og-faint);
  font-family: "Geist Mono", monospace;
}

.mockup-body {
  display: flex;
  min-height: 340px;
}

.mockup-nav {
  width: 168px;
  flex: none;
  display: none;
  flex-direction: column;
  border-right: 1px solid var(--og-border);
  padding: 0.9rem 0.6rem;
  font-size: 0.78rem;
  color: var(--og-muted);
}

.mockup-nav-items {
  flex: 1;
}

.mockup-nav-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.6rem;
  border-radius: var(--radius-md);
  margin-bottom: 0.15rem;
}

.mockup-nav-item svg {
  width: 14px;
  height: 14px;
  flex: none;
}

.mockup-nav-item.active {
  background: var(--og-surface-alt);
  color: var(--og-text);
}

.mockup-nav-foot {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.66rem;
  color: var(--og-faint);
  padding: 0.6rem;
  border-top: 1px solid var(--og-border);
}

.mockup-nav-foot .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--og-green);
  flex: none;
}

.mockup-main {
  flex: 1;
  min-width: 0;
  padding: 1.1rem 1.25rem 1.4rem;
}

.mockup-topbar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.mockup-search {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.72rem;
  color: var(--og-faint);
  background: var(--og-surface-alt);
  border: 1px solid var(--og-border);
  border-radius: var(--radius-md);
  padding: 0.4rem 0.6rem;
}

.mockup-search svg {
  width: 13px;
  height: 13px;
  flex: none;
}

.mockup-avatar {
  width: 24px;
  height: 24px;
  flex: none;
  border-radius: 50%;
  background: var(--og-action);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mockup-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.9rem;
  flex-wrap: wrap;
}

.mockup-header-id {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.mockup-img-circle {
  width: 42px;
  height: 42px;
  flex: none;
  border-radius: 50%;
  background: var(--og-surface-alt);
  border: 1px solid var(--og-border);
  color: var(--og-accent);
  display: flex;
  align-items: center;
  justify-content: center;
}

.mockup-img-circle svg {
  width: 20px;
  height: 20px;
}

.mockup-title-row {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex-wrap: wrap;
}

.mockup-id {
  font-family: "Geist Mono", monospace;
  font-size: 0.7rem;
  color: var(--og-accent);
  display: block;
  margin-bottom: 0.15rem;
}

.mockup-title-row h3 {
  margin: 0;
  font-size: 1.05rem;
  color: var(--og-text);
}

.mockup-sub {
  font-size: 0.72rem;
  color: var(--og-faint);
  margin-top: 0.2rem;
}

.mockup-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.mockup-actions .mini-btn {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--og-text);
  border: 1px solid var(--og-border-md);
  border-radius: var(--radius-md);
  padding: 0.35rem 0.55rem;
  white-space: nowrap;
}

.mockup-actions .mini-btn svg {
  width: 12px;
  height: 12px;
}

.mockup-actions .mini-btn.primary {
  background: var(--og-action);
  border-color: var(--og-action);
  color: #fff;
}

.mockup-tabs {
  display: flex;
  gap: 1.1rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--og-border);
  font-size: 0.78rem;
  color: var(--og-faint);
  overflow-x: auto;
  white-space: nowrap;
}

.mockup-tabs span {
  position: relative;
  padding-bottom: 0.5rem;
}

.mockup-tabs span.active {
  color: var(--og-accent);
  font-weight: 600;
}

.mockup-tabs span.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  border-radius: 2px;
  background: var(--og-accent);
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.68rem;
  font-weight: 500;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  border: 1px solid transparent;
}

.pill::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: currentColor;
}

.pill-valid { color: var(--og-green); background: rgba(var(--og-green-rgb), 0.12); border-color: rgba(var(--og-green-rgb), 0.28); }
.pill-due { color: var(--og-amber); background: rgba(var(--og-amber-rgb), 0.12); border-color: rgba(var(--og-amber-rgb), 0.28); }
.pill-expired { color: var(--og-red); background: rgba(var(--og-red-rgb), 0.12); border-color: rgba(var(--og-red-rgb), 0.28); }

.mockup-info {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.7rem;
  margin-bottom: 0.9rem;
}

.mockup-info-card {
  background: var(--og-surface-alt);
  border: 1px solid var(--og-border);
  border-radius: var(--radius-md);
  padding: 0.6rem 0.75rem;
}

.mockup-info-card .label {
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--og-faint);
  margin-bottom: 0.25rem;
}

.mockup-info-card .value {
  font-size: 0.9rem;
  color: var(--og-text);
  font-weight: 600;
}

.mockup-info-card .value .unit {
  font-size: 0.6rem;
  color: var(--og-faint);
  font-weight: 500;
  margin-left: 0.2rem;
  text-transform: none;
  letter-spacing: normal;
}

.mockup-info-card .value-sm {
  font-size: 0.8rem;
  color: var(--og-text);
  font-weight: 600;
  line-height: 1.5;
}

.mockup-info-card .value-sm.muted {
  color: var(--og-faint);
  font-weight: 500;
}

.info-bar {
  margin-top: 0.45rem;
  height: 4px;
  border-radius: 2px;
  background: var(--og-border-md);
  overflow: hidden;
}

.info-bar span {
  display: block;
  height: 100%;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--og-accent), var(--og-green));
}

.mockup-info-card.ring-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.ring {
  --pct: 60%;
  width: 46px;
  height: 46px;
  flex: none;
  border-radius: 50%;
  background: conic-gradient(var(--og-green) calc(var(--pct)), var(--og-border-md) 0);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.ring::before {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: 50%;
  background: var(--og-surface-alt);
}

.ring-value {
  position: relative;
  text-align: center;
  line-height: 1.05;
}

.ring-value b {
  display: block;
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--og-text);
}

.ring-value span {
  display: block;
  font-size: 0.48rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--og-faint);
}

.mockup-panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.7rem;
}

.mockup-panel {
  background: var(--og-surface-alt);
  border: 1px solid var(--og-border);
  border-radius: var(--radius-md);
  padding: 0.7rem 0.8rem;
}

.mockup-panel h4 {
  margin: 0 0 0.55rem;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--og-text);
}

.mockup-field {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  padding: 0.3rem 0;
}

.mockup-field + .mockup-field {
  border-top: 1px solid var(--og-border);
}

.mockup-field .f-label {
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--og-faint);
}

.mockup-field .f-value {
  font-size: 0.76rem;
  color: var(--og-text);
}

.mockup-field .f-value.mono {
  font-family: "Geist Mono", monospace;
  color: var(--og-accent);
}

/* ---------------------------------------------------------------- standards strip */

.standards {
  padding: 2.5rem 0;
  border-top: 1px solid var(--og-border);
  border-bottom: 1px solid var(--og-border);
}

.standards p {
  text-align: center;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--og-faint);
  margin: 0 0 1.4rem;
}

.standards-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 2.2rem 2.8rem;
}

.standards-row span {
  font-size: 0.85rem;
  color: var(--og-muted);
  font-family: "Geist Mono", monospace;
  white-space: nowrap;
}

/* ---------------------------------------------------------------- section headers */

.section {
  padding: 5.5rem 0;
}

.section-head {
  max-width: 640px;
  margin: 0 0 3rem;
}

.section-head.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.eyebrow {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--og-accent);
  margin-bottom: 0.75rem;
}

.section-head h2 {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  letter-spacing: -0.01em;
  margin: 0 0 0.8rem;
  font-weight: 700;
}

.section-head p {
  color: var(--og-muted);
  font-size: 1rem;
  margin: 0;
}

/* ---------------------------------------------------------------- feature grid */

.grid-6 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.card {
  background: var(--og-surface);
  border: 1px solid var(--og-border);
  border-radius: var(--radius-lg);
  padding: 1.4rem;
  box-shadow: var(--shadow-card);
}

.card .icon-badge {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-md);
  background: rgba(var(--og-accent-rgb), 0.1);
  color: var(--og-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.card .icon-badge svg {
  width: 17px;
  height: 17px;
}

.card h3 {
  font-size: 0.95rem;
  margin: 0 0 0.45rem;
  font-weight: 600;
}

.card p {
  font-size: 0.85rem;
  color: var(--og-muted);
  margin: 0;
  line-height: 1.55;
}

/* ---------------------------------------------------------------- architecture */

.arch-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.arch-checklist {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.arch-checklist li {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.9rem;
  color: var(--og-text);
}

.arch-checklist svg {
  width: 16px;
  height: 16px;
  flex: none;
  margin-top: 0.15rem;
  color: var(--og-green);
}

.stack {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding-left: 1.5rem;
}

/* Connecting gradient timeline — a "git graph" running between the
   architecture layers, hue-shifting from the UI layer down to storage. */
.stack::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(to bottom, #22d3ee, #3d9ab8, #8b5cf6, #14b8a6);
  opacity: 0.75;
}

.stack-layer {
  position: relative;
  border: 1px solid var(--og-border);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  font-size: 0.82rem;
  color: var(--og-muted);
  text-align: center;
}

.stack-layer::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  box-shadow: 0 0 0 3px var(--og-bg);
}

.stack-layer b {
  color: var(--og-text);
  font-weight: 600;
}

.stack-layer.mono {
  font-family: "Geist Mono", monospace;
}

.stack-layer.layer-1 {
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.14), rgba(61, 154, 184, 0.04));
  border-color: rgba(34, 211, 238, 0.3);
}
.stack-layer.layer-1::before { background: #22d3ee; }

.stack-layer.layer-2 {
  background: linear-gradient(135deg, rgba(var(--og-accent-rgb), 0.18), rgba(59, 130, 246, 0.06));
  border-color: rgba(var(--og-accent-rgb), 0.35);
  color: var(--og-accent);
}
.stack-layer.layer-2::before { background: var(--og-accent); }

.stack-layer.layer-3 {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.14), rgba(61, 154, 184, 0.04));
  border-color: rgba(139, 92, 246, 0.3);
}
.stack-layer.layer-3::before { background: #8b5cf6; }

.stack-layer.layer-4 {
  background: linear-gradient(135deg, rgba(20, 184, 166, 0.16), rgba(61, 154, 184, 0.05));
  border-color: rgba(20, 184, 166, 0.32);
  color: var(--og-accent);
}
.stack-layer.layer-4::before { background: #14b8a6; }

.facts-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 0.6rem;
  padding: 0 0.2rem;
  flex-wrap: wrap;
}

.facts-row span {
  font-size: 0.72rem;
  color: var(--og-faint);
  font-family: "Geist Mono", monospace;
}

/* ---------------------------------------------------------------- product */

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.product-card h3 {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.product-card h3 svg {
  width: 17px;
  height: 17px;
  color: var(--og-accent);
}

.product-preview {
  margin-top: 1rem;
  background: var(--og-surface-alt);
  border: 1px solid var(--og-border);
  border-radius: var(--radius-md);
  padding: 0.6rem 0.7rem;
  font-size: 0.78rem;
}

.preview-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.3rem 0;
}

.preview-row + .preview-row {
  border-top: 1px solid var(--og-border);
}

.preview-row .id {
  font-family: "Geist Mono", monospace;
  color: var(--og-faint);
  font-size: 0.72rem;
  margin-right: 0.4rem;
}

.diff-add { color: var(--og-green); font-family: "Geist Mono", monospace; }
.diff-rem { color: var(--og-red); font-family: "Geist Mono", monospace; text-decoration: none; }

.cert-preview {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.cert-preview svg {
  width: 18px;
  height: 18px;
  color: var(--og-green);
  flex: none;
}

.cert-preview .cert-id {
  color: var(--og-text);
  font-family: "Geist Mono", monospace;
  font-size: 0.8rem;
}

.cert-preview .cert-sub {
  color: var(--og-faint);
  font-size: 0.7rem;
}

/* ---------------------------------------------------------------- api section */

.api-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.api-ctas {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.6rem;
  flex-wrap: wrap;
}

.api-code {
  background: var(--og-surface);
  border: 1px solid var(--og-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.api-code-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--og-border);
  font-size: 0.72rem;
}

.method-get {
  color: var(--og-accent);
  font-weight: 700;
  font-family: "Geist Mono", monospace;
}

.api-code-bar .path {
  color: var(--og-muted);
  font-family: "Geist Mono", monospace;
}

.api-code pre {
  margin: 0;
  padding: 1rem 1.1rem;
  font-size: 0.78rem;
  line-height: 1.7;
  overflow-x: auto;
  color: var(--og-muted);
}

.api-code .k { color: var(--og-text); }
.api-code .s { color: var(--og-accent); }
.api-code .n { color: var(--og-number); }

/* ---------------------------------------------------------------- final cta */

.final-cta {
  padding: 5.5rem 0 6rem;
  text-align: center;
  border-top: 1px solid var(--og-border);
}

.final-cta h2 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  margin: 0 0 0.9rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.final-cta p {
  max-width: 520px;
  margin: 0 auto 2rem;
  color: var(--og-muted);
}

.final-cta .hero-ctas {
  margin-bottom: 0;
}

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

footer {
  border-top: 1px solid var(--og-border);
  padding: 2.5rem 0;
}

.footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.footer-brand .brand-logo {
  height: 50px;
}

.footer-brand .tagline {
  font-size: 0.78rem;
  color: var(--og-faint);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.82rem;
  color: var(--og-muted);
}

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

.footer-meta {
  font-size: 0.78rem;
  color: var(--og-faint);
}

/* ---------------------------------------------------------------- responsive */

@media (min-width: 900px) {
  .mockup-nav {
    display: flex;
  }
}

@media (max-width: 900px) {
  .grid-6 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-3 {
    grid-template-columns: 1fr;
  }
  .arch-layout,
  .api-layout {
    grid-template-columns: 1fr;
  }
  .api-layout {
    gap: 2rem;
  }
}

.nav-extra-link {
  display: none;
}

@media (max-width: 720px) {
  .nav-links,
  .nav-actions .btn-ghost,
  .nav-actions .btn-primary {
    display: none;
  }
  .nav-extra-link {
    display: block;
  }
  .nav-toggle {
    display: flex;
  }
  .grid-6 {
    grid-template-columns: 1fr;
  }
  .mockup-info {
    grid-template-columns: 1fr;
  }
  .mockup-panels {
    grid-template-columns: 1fr;
  }
  .mockup-topbar .mockup-search span {
    display: none;
  }
  .standards-row {
    gap: 1.2rem 1.8rem;
  }
  .section {
    padding: 3.5rem 0;
  }
  .hero {
    padding: 3.5rem 0 2.5rem;
  }
}

.nav.nav-open .nav-links {
  display: flex;
  position: absolute;
  top: 64px;
  left: 0;
  right: 0;
  flex-direction: column;
  align-items: flex-start;
  gap: 0;
  background: var(--og-surface);
  border-bottom: 1px solid var(--og-border);
  padding: 0.5rem 1.5rem 1rem;
}

.nav.nav-open .nav-links a {
  padding: 0.6rem 0;
  width: 100%;
}