* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --ink: #0b1020;
  --ink-soft: #1a2238;
  --paper: #f6f8fb;
  --surface: #ffffff;
  --steel: #5b6475;
  --line: #d6dbe6;
  --trust: #1d4ed8;
  --trust-deep: #173ea8;
  --verify: #0f766e;
  --warn: #b45309;
  --risk: #b91c1c;
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --shadow-card: 0 10px 32px rgba(12, 25, 58, 0.09);
  --shadow-soft: 0 6px 20px rgba(12, 25, 58, 0.08);
  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'IBM Plex Sans', 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'SFMono-Regular', monospace;
  --max-width: 1120px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(circle at 10% -10%, rgba(29, 78, 216, 0.12), transparent 50%),
    radial-gradient(circle at 110% 10%, rgba(15, 118, 110, 0.11), transparent 45%),
    var(--paper);
  line-height: 1.55;
}

a {
  color: inherit;
}

.container {
  width: min(var(--max-width), 100% - 2.5rem);
  margin: 0 auto;
}

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

.skip-link:focus {
  left: 1rem;
  top: 1rem;
  z-index: 9999;
  background: var(--ink);
  color: #fff;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-sm);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  border-bottom: 1px solid rgba(214, 219, 230, 0.75);
  background: rgba(246, 248, 251, 0.84);
  backdrop-filter: blur(14px);
}

.site-nav {
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.logo {
  display: inline-flex;
  align-items: baseline;
  gap: 0.35rem;
  text-decoration: none;
  font-size: 1.13rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.logo-mark {
  display: inline-flex;
  width: 0.65rem;
  height: 0.65rem;
  border-radius: 50%;
  margin-right: 0.45rem;
  background: linear-gradient(145deg, var(--trust), var(--verify));
}

.logo-main {
  color: var(--ink);
}

.logo-byline {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--steel);
}

.mobile-menu-btn {
  display: none;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--ink);
  padding: 0.42rem 0.64rem;
  font: inherit;
  cursor: pointer;
}

.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 1.15rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--steel);
  font-size: 0.95rem;
  font-weight: 500;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--ink);
}

.btn {
  border-radius: 999px;
  border: 1px solid transparent;
  padding: 0.7rem 1.1rem;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: 160ms ease;
  cursor: pointer;
}

.btn-primary {
  background: var(--trust);
  color: #fff;
  box-shadow: var(--shadow-soft);
}

.btn-primary:hover {
  background: var(--trust-deep);
  transform: translateY(-1px);
}

.btn-secondary {
  border-color: var(--line);
  background: var(--surface);
  color: var(--ink-soft);
}

.btn-secondary:hover {
  border-color: var(--trust);
  color: var(--trust);
}

.btn-block {
  width: 100%;
  justify-content: center;
}

.section {
  padding: 4.4rem 0;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  line-height: 1.15;
  margin-bottom: 0.8rem;
}

.section-lede {
  color: var(--steel);
  max-width: 62ch;
}

.hero {
  padding: 4.8rem 0 4.2rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 2rem;
  align-items: start;
}

.kicker {
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--trust);
  font-weight: 700;
  margin-bottom: 0.85rem;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5.3vw, 4rem);
  line-height: 1.02;
  margin-bottom: 1rem;
  max-width: 14ch;
}

.hero p {
  color: var(--steel);
  max-width: 52ch;
  font-size: 1.04rem;
}

.cta-row {
  margin-top: 1.35rem;
  display: flex;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.proof-chips {
  margin-top: 1.35rem;
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  gap: 0.6rem;
}

.proof-chips li {
  border-radius: 999px;
  border: 1px solid rgba(29, 78, 216, 0.22);
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink-soft);
  font-size: 0.84rem;
  padding: 0.32rem 0.7rem;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.hero-proof-card {
  padding: 1.15rem;
}

.panel-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.8rem;
}

.signal-stack {
  display: grid;
  gap: 0.62rem;
}

.signal-row {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #fefefe;
  padding: 0.7rem 0.78rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
}

.signal-key {
  font-size: 0.9rem;
  color: var(--steel);
}

.signal-value {
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.signal-ok {
  color: var(--verify);
}

.signal-warn {
  color: var(--warn);
}

.signal-fail {
  color: var(--risk);
}

.signal-note {
  margin-top: 0.65rem;
  color: var(--steel);
  font-size: 0.84rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  padding: 1rem;
  box-shadow: var(--shadow-soft);
}

.card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.3rem;
}

.card p {
  color: var(--steel);
  font-size: 0.95rem;
}

.eyebrow {
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--trust);
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.api-steps {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
}

.api-step {
  border: 1px solid var(--line);
  background: linear-gradient(170deg, #fff, #f7f9ff);
  border-radius: var(--radius-md);
  padding: 0.9rem;
}

.api-step h4 {
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
}

.code-chip {
  display: block;
  border-radius: 10px;
  background: #0f172a;
  color: #dbe7ff;
  padding: 0.58rem 0.65rem;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  line-height: 1.35;
}

.section-muted {
  background: rgba(255, 255, 255, 0.6);
  border-top: 1px solid rgba(214, 219, 230, 0.8);
  border-bottom: 1px solid rgba(214, 219, 230, 0.8);
}

.cta-band {
  border: 1px solid rgba(29, 78, 216, 0.25);
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, rgba(29, 78, 216, 0.08), rgba(15, 118, 110, 0.08));
  padding: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.cta-band p {
  color: var(--steel);
  max-width: 55ch;
}

footer {
  border-top: 1px solid var(--line);
  margin-top: 2.6rem;
  padding: 1.6rem 0 2.2rem;
}

.footer-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  color: var(--steel);
  font-size: 0.88rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}

.footer-links a {
  color: var(--steel);
  text-decoration: none;
}

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

.verify-hero {
  padding: 3.1rem 0 1.7rem;
}

.verify-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  gap: 1rem;
  align-items: start;
}

.verify-panel {
  padding: 1rem;
}

.verify-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.45rem;
  margin-bottom: 0.9rem;
}

.verify-tab {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #f8fafe;
  color: var(--steel);
  padding: 0.52rem 0.7rem;
  text-align: center;
  font-size: 0.87rem;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
}

.verify-tab.active {
  border-color: var(--trust);
  background: rgba(29, 78, 216, 0.1);
  color: var(--trust);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.form-group {
  margin-bottom: 0.75rem;
}

.form-label {
  display: block;
  margin-bottom: 0.3rem;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.form-help {
  display: block;
  margin-top: 0.3rem;
  color: var(--steel);
  font-size: 0.8rem;
}

.form-input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--ink);
  padding: 0.63rem 0.66rem;
  font: inherit;
}

.form-input:focus,
.verify-tab:focus,
.btn:focus,
.logo:focus,
.mobile-menu-btn:focus {
  outline: 2px solid rgba(29, 78, 216, 0.4);
  outline-offset: 2px;
}

.form-textarea {
  min-height: 136px;
  resize: vertical;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.verify-button {
  width: 100%;
  border: none;
  background: var(--trust);
  color: #fff;
  border-radius: 999px;
  padding: 0.7rem 0.9rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.verify-button:hover:not(:disabled) {
  background: var(--trust-deep);
}

.verify-button:disabled {
  opacity: 0.7;
}

.loading-spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.5);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.result-container {
  margin-top: 0.9rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  padding: 0.85rem;
  display: none;
}

.result-success {
  border-color: rgba(15, 118, 110, 0.3);
  background: rgba(15, 118, 110, 0.08);
}

.result-warning {
  border-color: rgba(180, 83, 9, 0.35);
  background: rgba(180, 83, 9, 0.08);
}

.result-error {
  border-color: rgba(185, 28, 28, 0.35);
  background: rgba(185, 28, 28, 0.08);
}

.result-title {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 700;
  font-size: 0.94rem;
  margin-bottom: 0.45rem;
}

.result-icon {
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

.result-details {
  font-size: 0.85rem;
}

.result-details ul {
  margin-top: 0.3rem;
  margin-left: 1rem;
}

.result-summary {
  color: var(--ink-soft);
  font-size: 0.84rem;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 700;
  padding: 0.18rem 0.5rem;
}

.status-pass {
  border-color: rgba(15, 118, 110, 0.4);
  color: var(--verify);
  background: rgba(15, 118, 110, 0.08);
}

.status-warn {
  border-color: rgba(180, 83, 9, 0.4);
  color: var(--warn);
  background: rgba(180, 83, 9, 0.08);
}

.status-fail {
  border-color: rgba(185, 28, 28, 0.42);
  color: var(--risk);
  background: rgba(185, 28, 28, 0.08);
}

.status-skip {
  border-color: var(--line);
  color: var(--steel);
  background: rgba(91, 100, 117, 0.07);
}

.result-ladder {
  margin-top: 0.6rem;
  display: grid;
  gap: 0.35rem;
}

.result-ladder-row {
  border: 1px solid rgba(214, 219, 230, 0.9);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.55);
  padding: 0.4rem 0.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem;
}

.result-ladder-row .label {
  color: var(--ink-soft);
  font-size: 0.82rem;
}

.result-list {
  margin-top: 0.6rem;
}

.result-list p {
  font-weight: 600;
}

.result-list ul {
  margin-top: 0.25rem;
}

.examples {
  margin-top: 0.9rem;
  border-top: 1px solid var(--line);
  padding-top: 0.8rem;
}

.examples h3 {
  font-size: 0.88rem;
  margin-bottom: 0.45rem;
}

.example-links {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.example-link {
  font-size: 0.78rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.34rem 0.58rem;
  text-decoration: none;
  color: var(--ink-soft);
  background: #fff;
}

.example-link:hover {
  border-color: var(--trust);
  color: var(--trust);
}

.manifesto-hero {
  padding: 3.4rem 0 1.6rem;
}

.manifesto-grid {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
}

.principle-grid {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.roadmap-grid {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.roadmap-item {
  border-left: 3px solid var(--trust);
}

.roadmap-item h3 {
  font-size: 1rem;
  margin-bottom: 0.35rem;
}

.roadmap-item p {
  color: var(--steel);
  font-size: 0.92rem;
}

.api-hero {
  padding: 3.4rem 0 2rem;
}

.api-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 1rem;
  align-items: start;
}

.api-group {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  padding: 0.95rem;
  box-shadow: var(--shadow-soft);
}

.api-group h3 {
  font-size: 1.03rem;
  margin-bottom: 0.38rem;
}

.api-group p {
  color: var(--steel);
  font-size: 0.9rem;
}

.endpoint-list {
  list-style: none;
  display: grid;
  gap: 0.45rem;
  margin-top: 0.7rem;
}

.endpoint-item {
  border: 1px solid var(--line);
  background: #fbfcff;
  border-radius: 10px;
  padding: 0.5rem 0.55rem;
}

.endpoint-item code {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: #223251;
}

.endpoint-item span {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.79rem;
  color: var(--steel);
}

.code-block {
  margin-top: 0.6rem;
  border-radius: 12px;
  background: #0f172a;
  color: #dbe7ff;
  border: 1px solid #24314e;
  overflow: hidden;
}

.code-block-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  border-bottom: 1px solid #24314e;
  padding: 0.42rem 0.52rem;
  font-size: 0.72rem;
  color: #97a7ce;
}

.copy-btn {
  border: 1px solid #3a4a72;
  background: #1b2744;
  color: #dbe7ff;
  border-radius: 999px;
  padding: 0.22rem 0.5rem;
  font-size: 0.72rem;
  cursor: pointer;
}

.copy-btn:hover {
  background: #23325b;
}

.copy-btn[data-copied='true'] {
  border-color: rgba(15, 118, 110, 0.65);
  color: #c7fff2;
}

.code-block pre {
  margin: 0;
  padding: 0.56rem 0.6rem 0.68rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.77rem;
  line-height: 1.45;
}

.api-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
  margin-top: 1rem;
}

.scroll-animate {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 380ms ease, transform 380ms ease;
}

.scroll-animate.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 980px) {
  .hero-grid,
  .verify-layout,
  .grid-3,
  .grid-2,
  .api-steps,
  .api-layout,
  .api-grid,
  .manifesto-grid,
  .principle-grid,
  .roadmap-grid {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    max-width: 17ch;
  }
}

@media (max-width: 860px) {
  .mobile-menu-btn {
    display: inline-flex;
  }

  .nav-links {
    position: absolute;
    top: 70px;
    left: 1rem;
    right: 1rem;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: #fff;
    padding: 0.7rem;
    box-shadow: var(--shadow-card);
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0.3rem;
  }

  .nav-links a {
    display: block;
    border-radius: 8px;
    padding: 0.45rem 0.5rem;
  }

  .nav-links a:hover,
  .nav-links a.active {
    background: rgba(29, 78, 216, 0.08);
  }

  .nav-links.active {
    display: flex;
  }

  .site-nav {
    position: relative;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(var(--max-width), 100% - 1.4rem);
  }

  .logo-byline {
    font-size: 0.64rem;
  }

  .section,
  .hero {
    padding-top: 3.2rem;
    padding-bottom: 3rem;
  }

  .cta-row .btn {
    width: 100%;
    justify-content: center;
  }
}