@import url('https://fonts.googleapis.com/css2?family=Geist+Mono:wght@300;400;500;600;700;800;900&family=Work+Sans:wght@400;500;600;700;800;900&display=swap');

:root {
  color-scheme: light;
  --background: #fafafa;
  --foreground: #1a1a2e;
  --card: #ffffff;
  --card-foreground: #1a1a2e;
  --primary: #5046e5;
  --primary-deep: #4338ca;
  --primary-bright: #6366f1;
  --primary-foreground: #ffffff;
  --muted: #e8e6f0;
  --muted-foreground: #6b6b7b;
  --border: #4338ca;
  --input: #e8e6f0;
  --shadow-color: #4f46b8;
  --destructive: #dc2626;
  --destructive-foreground: #ffffff;
  --radius: 0px;
  --shadow-sm: 2px 2px 0px 0px var(--shadow-color);
  --shadow: 4px 4px 0px 0px var(--shadow-color);
  --shadow-lg: 8px 8px 0px 0px var(--shadow-color);
  --font-body: 'Geist Mono', 'JetBrains Mono', 'SF Mono', Monaco, monospace;
  --font-display: 'Work Sans', 'Geist Mono', system-ui, sans-serif;
  --max-width: 1180px;
  --header-height: 76px;
}

:root[data-theme='dark'] {
  color-scheme: dark;
  --background: #0a0a1a;
  --foreground: #e8e6f0;
  --card: #121225;
  --card-foreground: #e8e6f0;
  --primary: #818cf8;
  --primary-deep: #6366f1;
  --primary-bright: #a5b4fc;
  --primary-foreground: #0a0a1a;
  --muted: #1e1e35;
  --muted-foreground: #9ca3af;
  --border: #312e81;
  --input: #1e1e35;
  --shadow-color: #312e81;
  --destructive: #f87171;
  --destructive-foreground: #0a0a1a;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    linear-gradient(90deg, var(--border) 1px, transparent 1px) 0 0 / 48px 48px,
    linear-gradient(var(--border) 1px, transparent 1px) 0 0 / 48px 48px,
    var(--background);
  color: var(--foreground);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  letter-spacing: -0.01em;
  transition: background-color 200ms ease, color 200ms ease;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: '';
  background: radial-gradient(circle at 18% 8%, rgb(80 70 229 / 0.16), transparent 34rem);
}

:root[data-theme='dark'] body::before {
  background: radial-gradient(circle at 18% 8%, rgb(129 140 248 / 0.18), transparent 34rem);
}

a {
  color: inherit;
  text-decoration-thickness: 0.12em;
  text-underline-offset: 0.22em;
}

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

button,
input,
textarea,
select {
  font: inherit;
}

.skip-link {
  position: absolute;
  top: -80px;
  left: 16px;
  z-index: 1000;
  padding: 0.75rem 1rem;
  background: var(--primary);
  color: var(--primary-foreground);
  border: 2px solid var(--border);
  box-shadow: var(--shadow);
}

.skip-link:focus {
  top: 16px;
}

:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--background), 0 0 0 5px var(--primary);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  min-height: var(--header-height);
  border-bottom: 2px solid var(--border);
  background: rgb(250 250 250 / 0.92);
  backdrop-filter: blur(12px);
}

:root[data-theme='dark'] .site-header {
  background: rgb(10 10 26 / 0.92);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: min(var(--max-width), calc(100% - 2rem));
  min-height: var(--header-height);
  margin: 0 auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--foreground);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  padding: 6px;
  background: var(--card);
  border: 2px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.brand-text {
  display: grid;
  line-height: 1.05;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 900;
  letter-spacing: -0.04em;
}

.brand-kicker {
  color: var(--muted-foreground);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.nav a,
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0.55rem 0.8rem;
  color: var(--foreground);
  text-decoration: none;
  border: 1px solid var(--border);
  background: var(--card);
  box-shadow: var(--shadow-sm);
  transition: transform 140ms ease, box-shadow 140ms ease, background-color 140ms ease;
}

.nav a:hover,
.theme-toggle:hover {
  transform: translate(-1px, -1px);
  box-shadow: var(--shadow);
}

.theme-toggle {
  margin-left: 0.35rem;
  cursor: pointer;
}

.container {
  width: min(var(--max-width), calc(100% - 2rem));
  margin: 0 auto;
}

.section {
  padding: clamp(4.5rem, 8vw, 8rem) 0;
  scroll-margin-top: calc(var(--header-height) + 1.5rem);
}

.section-tight {
  padding: clamp(3rem, 6vw, 5rem) 0;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(360px, 0.82fr);
  align-items: center;
  gap: clamp(2rem, 5vw, 5rem);
  min-height: calc(100svh - var(--header-height));
  padding-top: clamp(3rem, 7vw, 6rem);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 1.25rem;
  padding: 0.45rem 0.65rem;
  color: var(--primary);
  border: 2px solid var(--border);
  background: var(--card);
  box-shadow: var(--shadow-sm);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 0.65rem;
  height: 0.65rem;
  content: '';
  background: var(--primary);
}

.hero h1 {
  max-width: 12ch;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(4rem, 10vw, 8.8rem);
  font-weight: 900;
  line-height: 0.86;
  letter-spacing: -0.08em;
  text-wrap: balance;
}

.tagline {
  max-width: 680px;
  margin: 1.4rem 0 0;
  color: var(--foreground);
  font-size: clamp(1.35rem, 2.6vw, 2.35rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.045em;
}

.hero-copy {
  max-width: 640px;
  margin: 1.2rem 0 0;
  color: var(--muted-foreground);
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  min-height: 48px;
  padding: 0.78rem 1.1rem;
  color: var(--foreground);
  font-weight: 800;
  text-decoration: none;
  border: 2px solid var(--border);
  background: var(--card);
  box-shadow: var(--shadow);
  transition: transform 140ms ease, box-shadow 140ms ease, background-color 140ms ease;
}

.button:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-lg);
}

.button:active {
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0px 0px var(--shadow-color);
}

.button-primary {
  background: var(--primary);
  color: var(--primary-foreground);
}

.button-secondary {
  background: var(--card);
  color: var(--foreground);
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.75rem;
}

.signal {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0.35rem 0.65rem;
  color: var(--muted-foreground);
  border: 1px solid var(--border);
  background: var(--card);
  font-size: 0.82rem;
}

.product-frame {
  position: relative;
  padding: 1rem;
  background: var(--card);
  border: 2px solid var(--border);
  box-shadow: var(--shadow-lg);
}

.product-frame::before {
  position: absolute;
  top: -12px;
  left: 1rem;
  padding: 0.2rem 0.55rem;
  content: 'extension surface';
  background: var(--primary);
  color: var(--primary-foreground);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.product-frame img {
  width: 100%;
  border: 1px solid var(--border);
}

.feature-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  overflow: hidden;
  border: 2px solid var(--border);
  background: var(--border);
  box-shadow: var(--shadow);
}

.feature-strip .feature-mini {
  min-height: 150px;
  padding: 1.2rem;
  background: var(--card);
}

.feature-mini h3 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
}

.feature-mini p {
  margin: 0;
  color: var(--muted-foreground);
  font-size: 0.9rem;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.75fr) minmax(260px, 0.45fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: end;
  margin-bottom: clamp(2rem, 5vw, 4rem);
}

.section-heading h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.06em;
}

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

.anchor-target {
  display: block;
  scroll-margin-top: calc(var(--header-height) + 1rem);
}

.faq-toc {
  margin-top: 1.5rem;
  padding: 1rem;
  border: 2px solid var(--border);
  background: var(--card);
  box-shadow: var(--shadow-sm);
}

.faq-toc h3 {
  margin: 0 0 0.75rem;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.faq-toc div {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.faq-toc a {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  padding: 0.45rem 0.7rem;
  color: var(--foreground);
  text-decoration: none;
  border: 1px solid var(--border);
  background: var(--muted);
}

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

.card {
  position: relative;
  min-height: 260px;
  padding: 1.25rem;
  background: var(--card);
  border: 2px solid var(--border);
  box-shadow: var(--shadow);
  transition: transform 140ms ease, box-shadow 140ms ease;
}

.card:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-lg);
}

.card-index {
  display: inline-flex;
  width: 34px;
  height: 34px;
  align-items: center;
  justify-content: center;
  margin-bottom: 2rem;
  background: var(--primary);
  color: var(--primary-foreground);
  border: 2px solid var(--border);
  font-weight: 900;
}

.card h3 {
  margin: 0 0 0.8rem;
  font-size: 1.15rem;
  line-height: 1.2;
}

.card p {
  margin: 0;
  color: var(--muted-foreground);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(320px, 0.7fr);
  gap: clamp(1.5rem, 5vw, 4rem);
  align-items: start;
}

.prose {
  color: var(--muted-foreground);
}

.prose h3 {
  margin: 0 0 0.75rem;
  color: var(--foreground);
  font-size: 1.1rem;
}

.prose p {
  margin: 0 0 1rem;
}

.prose ul {
  display: grid;
  gap: 0.65rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

.prose li {
  position: relative;
  padding-left: 1.1rem;
}

.prose li::before {
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 0.45rem;
  height: 0.45rem;
  content: '';
  background: var(--primary);
}

.steps {
  display: grid;
  gap: 1rem;
}

.step {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 1rem;
  align-items: start;
  padding: 1rem;
  background: var(--card);
  border: 2px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.step-number {
  display: grid;
  width: 56px;
  height: 56px;
  place-items: center;
  background: var(--primary);
  color: var(--primary-foreground);
  border: 2px solid var(--border);
  font-weight: 900;
}

.step h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
}

.step p {
  margin: 0;
  color: var(--muted-foreground);
}

.custom-steps .step {
  min-height: auto;
}

.custom-steps h3 {
  margin-bottom: 0.75rem;
}

.custom-steps ul {
  display: grid;
  gap: 0.5rem;
  margin: 0.75rem 0 0;
  padding: 0;
  list-style: none;
}

.custom-steps ul li {
  position: relative;
  padding-left: 1.1rem;
}

.custom-steps ul li::before {
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 0.45rem;
  height: 0.45rem;
  content: '';
  background: var(--primary);
}

.custom-steps code {
  overflow-wrap: anywhere;
}

.instruction-code {
  margin: 1rem 0 0;
  padding: 1rem;
  overflow-x: auto;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  background: var(--muted);
  border: 2px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.provider-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.provider-card {
  display: grid;
  min-height: 132px;
  place-items: center;
  padding: 1rem;
  background: var(--card);
  border: 2px solid var(--border);
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.provider-card img {
  max-height: 74px;
  object-fit: contain;
}

.provider-card strong {
  display: block;
  margin-top: 0.8rem;
  font-size: 0.88rem;
  letter-spacing: -0.02em;
}

.provider-card.text-only strong {
  color: var(--foreground);
}

.api-guide-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.api-guide-card {
  padding: 1.2rem;
  background: var(--card);
  border: 2px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.api-guide-card h3 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: 1.2rem;
  line-height: 1.1;
  letter-spacing: -0.04em;
}

.api-guide-card h4 {
  margin: 1rem 0 0.35rem;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.api-guide-card p {
  margin: 0 0 0.8rem;
  color: var(--muted-foreground);
}

.api-guide-card ul {
  display: grid;
  gap: 0.65rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.api-guide-list li {
  position: relative;
  padding-left: 1.1rem;
}

.api-guide-list li::before {
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 0.45rem;
  height: 0.45rem;
  content: '';
  background: var(--primary);
}

.privacy-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.7fr) minmax(320px, 0.55fr);
  gap: 1.25rem;
  padding: clamp(1.25rem, 4vw, 2rem);
  background: var(--primary);
  color: var(--primary-foreground);
  border: 2px solid var(--border);
  box-shadow: var(--shadow-lg);
}

.privacy-panel h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.8rem);
  line-height: 0.95;
  letter-spacing: -0.06em;
}

.privacy-panel p {
  margin: 1rem 0 0;
  color: rgb(255 255 255 / 0.86);
}

:root[data-theme='dark'] .privacy-panel p {
  color: rgb(10 10 26 / 0.78);
}

.privacy-list {
  display: grid;
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.privacy-list li {
  padding: 0.9rem;
  background: rgb(255 255 255 / 0.14);
  border: 1px solid currentColor;
}

:root[data-theme='dark'] .privacy-list li {
  background: rgb(10 10 26 / 0.28);
}

.policy-details {
  margin-top: 1.25rem;
}

.policy-details summary {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  width: fit-content;
  min-height: 46px;
  padding: 0.7rem 1rem;
  cursor: pointer;
  color: var(--foreground);
  font-weight: 800;
  border: 2px solid var(--border);
  background: var(--card);
  box-shadow: var(--shadow-sm);
  list-style: none;
}

.policy-details summary::-webkit-details-marker {
  display: none;
}

.policy-details summary::after {
  content: '+';
  font-size: 1.2rem;
  line-height: 1;
}

.policy-details[open] summary::after {
  content: '−';
}

.policy-paper {
  margin-top: 1rem;
  padding: clamp(1.25rem, 4vw, 2rem);
  background: var(--card);
  border: 2px solid var(--border);
  box-shadow: var(--shadow);
}

.policy-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  align-items: baseline;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  color: var(--muted-foreground);
  border-bottom: 2px solid var(--border);
}

.policy-meta strong {
  color: var(--primary);
}

.policy-paper > p {
  max-width: 76ch;
  margin: 0 0 1.5rem;
  color: var(--muted-foreground);
}

.policy-section {
  padding: 1.2rem 0;
  border-top: 1px solid var(--border);
}

.policy-section h3 {
  margin: 0 0 0.65rem;
  font-size: 1rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.policy-section p,
.policy-section ul {
  max-width: 78ch;
  margin: 0;
  color: var(--muted-foreground);
}

.policy-section ul {
  display: grid;
  gap: 0.5rem;
  padding-left: 1.2rem;
}

.policy-close {
  margin-top: 1.5rem !important;
  padding-top: 1.2rem;
  color: var(--foreground) !important;
  border-top: 2px solid var(--border);
}

.faq-grid {
  display: grid;
  gap: 1rem;
}

.faq-item {
  padding: 1.2rem;
  background: var(--card);
  border: 2px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.faq-item h3 {
  margin: 0 0 0.6rem;
  font-size: 1rem;
}

.faq-item p {
  margin: 0;
  color: var(--muted-foreground);
}

.feedback-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1.5rem;
  align-items: center;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  background: var(--card);
  border: 2px solid var(--border);
  box-shadow: var(--shadow-lg);
}

.feedback-panel h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 4.5rem);
  line-height: 0.95;
  letter-spacing: -0.06em;
}

.feedback-panel p {
  margin: 0.75rem 0 0;
  color: var(--muted-foreground);
}

.site-footer {
  padding: 2rem 0;
  border-top: 2px solid var(--border);
  color: var(--muted-foreground);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

@media (max-width: 980px) {
  .hero,
  .split,
  .privacy-panel,
  .feedback-panel {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .feature-strip,
  .cards-grid,
  .provider-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .section-heading {
    grid-template-columns: 1fr;
  }

  .nav a:not(.nav-cta) {
    display: none;
  }
}

@media (max-width: 640px) {
  :root {
    --header-height: 68px;
  }

  .header-inner,
  .container {
    width: min(100% - 1rem, var(--max-width));
  }

  .brand-kicker {
    display: none;
  }

  .hero h1 {
    font-size: clamp(3.2rem, 18vw, 5rem);
  }

  .feature-strip,
  .cards-grid,
  .provider-grid {
    grid-template-columns: 1fr;
  }

  .api-guide-grid {
    grid-template-columns: 1fr;
  }

  .button {
    width: 100%;
  }

  .hero-actions {
    flex-direction: column;
  }

  .product-frame {
    padding: 0.6rem;
  }

  .feedback-panel {
    padding: 1.2rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
  }
}