@font-face {
  font-family: "IBM Plex Sans";
  src: url("assets/fonts/ibm-plex-sans-latin-400-normal.woff2") format("woff2");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Sans";
  src: url("assets/fonts/ibm-plex-sans-latin-500-normal.woff2") format("woff2");
  font-style: normal;
  font-weight: 500;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Sans";
  src: url("assets/fonts/ibm-plex-sans-latin-600-normal.woff2") format("woff2");
  font-style: normal;
  font-weight: 600;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Serif";
  src: url("assets/fonts/ibm-plex-serif-latin-600-normal.woff2") format("woff2");
  font-style: normal;
  font-weight: 600;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Mono";
  src: url("assets/fonts/ibm-plex-mono-latin-400-normal.woff2") format("woff2");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

:root {
  color-scheme: light dark;
  --font-sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif: "IBM Plex Serif", Georgia, "Times New Roman", serif;
  --font-mono: "IBM Plex Mono", Consolas, monospace;

  --neutral-0: #ffffff;
  --neutral-50: #faf9f7;
  --neutral-100: #f4f2ee;
  --neutral-200: #e8e4dc;
  --neutral-300: #d5cfc3;
  --neutral-400: #a7a195;
  --neutral-500: #716b5f;
  --neutral-600: #5a554c;
  --neutral-700: #403d37;
  --neutral-800: #2b2924;
  --neutral-900: #1a1917;
  --neutral-950: #0e0d0b;
  --accent-50: #eff4ff;
  --accent-400: #3b82f6;
  --accent-500: #1d4ed8;
  --accent-600: #1e40af;
  --warning-50: #fffbeb;
  --warning-500: #b45309;
  --warning-700: #78350f;

  --canvas: var(--neutral-50);
  --surface: var(--neutral-0);
  --surface-muted: var(--neutral-100);
  --border: var(--neutral-200);
  --text-primary: var(--neutral-900);
  --text-secondary: var(--neutral-600);
  --text-inverse: var(--neutral-0);
  --ring: var(--accent-400);
  --link: var(--accent-500);
  --link-hover: var(--accent-600);
  --code-canvas: var(--neutral-900);
  --code-text: var(--neutral-100);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-sm: 0 1px 2px rgba(14, 13, 11, 0.05);
  --shadow-lg: 0 24px 56px rgba(14, 13, 11, 0.16);
  --duration-short: 180ms;
  --ease-standard: cubic-bezier(0.2, 0, 0, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

body,
button,
a {
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--link-hover);
}

:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 3px;
}

::selection {
  background: #cbdcff;
  color: var(--neutral-950);
}

.container {
  width: min(100% - 3rem, 75rem);
  margin-inline: auto;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: var(--space-3);
  left: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--accent-500);
  color: var(--neutral-0);
  font-weight: 600;
  transform: translateY(-160%);
}

.skip-link:focus {
  color: var(--neutral-0);
  transform: translateY(0);
}

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 85%, transparent);
  background: color-mix(in srgb, var(--canvas) 92%, transparent);
  backdrop-filter: blur(14px);
}

.header-row {
  display: flex;
  min-height: 4rem;
  align-items: center;
  gap: var(--space-8);
}

.brand {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  gap: var(--space-3);
  color: var(--text-primary);
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.brand:hover {
  color: var(--text-primary);
}

.brand img {
  border-radius: var(--radius-md);
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  margin-left: auto;
}

.primary-nav a,
.site-footer nav a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
}

.primary-nav a:hover,
.site-footer nav a:hover {
  color: var(--text-primary);
}

.header-download {
  flex: none;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 500;
  line-height: 1;
  text-align: center;
  text-decoration: none;
  transition:
    background-color var(--duration-short) var(--ease-standard),
    border-color var(--duration-short) var(--ease-standard),
    color var(--duration-short) var(--ease-standard),
    transform var(--duration-short) var(--ease-standard);
}

.button:hover {
  transform: translateY(-1px);
}

.button:active {
  transform: translateY(0);
}

.button-small {
  min-height: 2.75rem;
  padding-inline: var(--space-4);
  font-size: 0.875rem;
}

.button-large {
  min-height: 3rem;
  padding-inline: var(--space-5);
}

.button svg {
  width: 1.25rem;
  height: 1.25rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.button-primary {
  background: var(--accent-500);
  color: var(--neutral-0);
}

.button-primary:hover {
  background: var(--accent-600);
  color: var(--neutral-0);
}

.button-secondary {
  border-color: var(--border);
  background: var(--surface);
  color: var(--text-primary);
}

.button-secondary:hover {
  border-color: var(--neutral-300);
  background: var(--surface-muted);
  color: var(--text-primary);
}

.button-inverse {
  border-color: var(--neutral-0);
  background: var(--neutral-0);
  color: var(--neutral-950);
}

.button-inverse:hover {
  border-color: var(--neutral-200);
  background: var(--neutral-200);
  color: var(--neutral-950);
}

.hero {
  overflow: hidden;
  padding: var(--space-24) 0 var(--space-20);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(34rem, 1.18fr);
  align-items: center;
  gap: var(--space-16);
}

.hero-copy {
  position: relative;
  z-index: 1;
}

.eyebrow {
  margin: 0 0 var(--space-4);
  color: var(--accent-500);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  line-height: 1.4;
  text-transform: uppercase;
}

.hero h1,
.section h2,
.security-section h2,
.closing-section h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: -0.025em;
}

.hero h1 {
  max-width: 11ch;
  font-size: clamp(3rem, 5.5vw, 4.5rem);
  line-height: 1.04;
}

.hero-lead {
  max-width: 34rem;
  margin: var(--space-6) 0 0;
  color: var(--text-secondary);
  font-size: 1.25rem;
  line-height: 1.5;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

.release-meta {
  margin: var(--space-4) 0 0;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.unsigned-note {
  max-width: 33rem;
  margin: var(--space-6) 0 0;
  padding-left: var(--space-4);
  border-left: 3px solid var(--warning-500);
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.unsigned-note strong {
  color: var(--text-primary);
}

.product-shot {
  position: relative;
  margin: 0;
}

.product-shot::before {
  position: absolute;
  z-index: -1;
  inset: 10% -8% -8% 8%;
  border: 1px solid var(--border);
  content: "";
}

.product-shot img {
  width: 100%;
  height: auto;
  border: 1px solid var(--neutral-300);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-lg);
}

.product-shot figcaption {
  margin-top: var(--space-3);
  color: var(--text-secondary);
  font-size: 0.75rem;
  text-align: right;
}

.proof-strip {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.proof-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 0;
}

.proof-list > div {
  min-height: 8rem;
  padding: var(--space-6);
  border-left: 1px solid var(--border);
}

.proof-list > div:last-child {
  border-right: 1px solid var(--border);
}

.proof-list dt {
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 1.5rem;
  line-height: 1.2;
}

.proof-list dd {
  max-width: 16rem;
  margin: var(--space-2) 0 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.45;
}

.section {
  padding: var(--space-32) 0;
}

.section-muted {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--surface-muted);
}

.split-section {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: center;
  gap: var(--space-24);
}

.split-reverse .diagram-surface {
  order: 1;
}

.split-reverse .section-copy {
  order: 2;
}

.section-copy h2,
.security-section h2,
.closing-section h2 {
  max-width: 14ch;
  font-size: clamp(2.25rem, 4vw, 3rem);
  line-height: 1.08;
}

.section-copy > p:not(.eyebrow):not(.section-lead),
.closing-layout > div > p {
  max-width: 40rem;
  color: var(--text-secondary);
}

.section-lead {
  margin: var(--space-6) 0 0;
  color: var(--text-secondary);
  font-size: 1.125rem;
  line-height: 1.6;
}

.check-list {
  display: grid;
  gap: var(--space-3);
  margin: var(--space-8) 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: var(--space-8);
}

.check-list li::before {
  position: absolute;
  top: 0.68em;
  left: 0;
  width: 1rem;
  height: 0.5rem;
  border-bottom: 2px solid var(--accent-500);
  border-left: 2px solid var(--accent-500);
  content: "";
  transform: rotate(-45deg);
  transform-origin: center;
}

.markdown-sample {
  overflow: hidden;
  border: 1px solid var(--neutral-700);
  border-radius: var(--radius-lg);
  background: var(--code-canvas);
  color: var(--code-text);
  box-shadow: 0 20px 48px rgba(14, 13, 11, 0.14);
}

.sample-bar {
  display: flex;
  min-height: 3.25rem;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: 0 var(--space-5);
  border-bottom: 1px solid var(--neutral-700);
  font-size: 0.75rem;
}

.sample-name {
  color: var(--neutral-200);
  font-weight: 500;
}

.sample-label {
  color: var(--neutral-400);
  font-family: var(--font-mono);
}

.markdown-sample pre {
  min-height: 23rem;
  margin: 0;
  padding: var(--space-8);
  overflow: auto;
  font-family: var(--font-mono);
  font-size: clamp(0.8125rem, 1.4vw, 0.9375rem);
  line-height: 1.75;
  white-space: pre-wrap;
}

.token-heading {
  color: #93c5fd;
}

.token-code {
  color: #d5cfc3;
}

.diagram-surface {
  border: 1px solid var(--border);
  background: var(--surface);
}

.diagram-surface svg {
  width: 100%;
  height: auto;
}

.diagram-node {
  fill: var(--surface-muted);
  stroke: var(--neutral-400);
  stroke-width: 2;
}

.diagram-node-accent {
  fill: var(--accent-50);
  stroke: var(--accent-500);
}

.diagram-line {
  fill: none;
  stroke: var(--accent-500);
  stroke-width: 3;
}

.diagram-surface marker path {
  fill: var(--accent-500);
}

.diagram-surface text {
  fill: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 20px;
  font-weight: 600;
  text-anchor: middle;
}

.diagram-surface .diagram-subtext {
  fill: var(--text-secondary);
  font-size: 14px;
  font-weight: 400;
}

.measurement-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(28rem, 1.1fr);
  gap: var(--space-24);
}

.text-link {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-4);
  font-weight: 600;
}

.measurement-list {
  margin: 0;
  border-top: 1px solid var(--border);
}

.measurement-list > div {
  display: grid;
  grid-template-columns: minmax(12rem, 0.75fr) 1fr;
  align-items: baseline;
  gap: var(--space-6);
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--border);
}

.measurement-list dt {
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 2rem;
  line-height: 1;
}

.measurement-list dt span {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.measurement-list dd {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.security-section {
  padding: var(--space-32) 0;
  background: var(--neutral-950);
  color: var(--neutral-50);
}

.security-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(30rem, 1.15fr);
  gap: var(--space-24);
}

.eyebrow-inverse {
  color: #93c5fd;
}

.security-lead {
  max-width: 34rem;
  margin: var(--space-6) 0 0;
  color: var(--neutral-300);
  font-size: 1.125rem;
}

.security-section .button {
  margin-top: var(--space-8);
}

.security-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--neutral-700);
  list-style: none;
}

.security-list li {
  display: grid;
  grid-template-columns: minmax(10rem, 0.7fr) 1.3fr;
  gap: var(--space-6);
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--neutral-700);
}

.security-list strong {
  color: var(--neutral-50);
  font-weight: 500;
}

.security-list span {
  color: var(--neutral-300);
  font-size: 0.9375rem;
}

.install-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(22rem, 0.85fr);
  gap: var(--space-24);
}

.inline-alert {
  max-width: 46rem;
  margin-top: var(--space-8);
  padding: var(--space-4);
  border-left: 4px solid var(--warning-500);
  border-radius: var(--radius-sm);
  background: var(--warning-50);
  color: var(--warning-700);
}

.inline-alert strong {
  display: block;
}

.requirements {
  margin: var(--space-4) 0 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.install-steps {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--border);
  list-style: none;
}

.install-steps li {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: var(--space-5);
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--border);
}

.install-steps > li > span {
  color: var(--accent-500);
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

.install-steps strong {
  font-size: 1.125rem;
  font-weight: 600;
}

.install-steps p {
  margin: var(--space-1) 0 0;
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

.closing-section {
  padding: var(--space-24) 0;
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.closing-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-24);
}

.closing-layout > div > p {
  margin-top: 0;
}

.closing-layout .hero-actions {
  margin-top: var(--space-6);
}

.site-footer {
  padding: var(--space-10) 0;
  border-top: 1px solid var(--border);
}

.footer-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-8);
}

.footer-row p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.8125rem;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: var(--space-5);
}

@media (prefers-color-scheme: dark) {
  :root {
    --canvas: var(--neutral-950);
    --surface: var(--neutral-900);
    --surface-muted: var(--neutral-800);
    --border: var(--neutral-700);
    --text-primary: var(--neutral-50);
    --text-secondary: var(--neutral-300);
    --text-inverse: var(--neutral-950);
    --link: #93c5fd;
    --link-hover: #bfdbfe;
    --code-canvas: #090807;
    --code-text: var(--neutral-100);
  }

  ::selection {
    background: #23468c;
    color: var(--neutral-50);
  }

  .site-header {
    background: color-mix(in srgb, var(--canvas) 92%, transparent);
  }

  .button-secondary {
    border-color: var(--neutral-700);
  }

  .button-secondary:hover {
    border-color: var(--neutral-600);
    background: var(--neutral-800);
  }

  .product-shot img {
    border-color: var(--neutral-700);
  }

  .diagram-node-accent {
    fill: #172554;
  }

  .inline-alert {
    background: #2b2112;
    color: #fde68a;
  }
}

@media (max-width: 68rem) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    max-width: 44rem;
  }

  .product-shot {
    max-width: 56rem;
  }

  .split-section,
  .measurement-layout,
  .security-layout,
  .install-layout,
  .closing-layout {
    grid-template-columns: 1fr;
    gap: var(--space-16);
  }

  .split-reverse .section-copy {
    order: 1;
  }

  .split-reverse .diagram-surface {
    order: 2;
  }

  .section-copy h2,
  .security-section h2,
  .closing-section h2 {
    max-width: 18ch;
  }
}

@media (max-width: 52rem) {
  .container {
    width: min(100% - 2rem, 75rem);
  }

  .primary-nav {
    display: none;
  }

  .header-download {
    margin-left: auto;
  }

  .hero {
    padding: var(--space-16) 0 var(--space-12);
  }

  .proof-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .proof-list > div:nth-child(3) {
    border-top: 1px solid var(--border);
  }

  .proof-list > div:nth-child(4) {
    border-top: 1px solid var(--border);
    border-right: 1px solid var(--border);
  }

  .section,
  .security-section {
    padding: var(--space-20) 0;
  }

  .measurement-list > div,
  .security-list li {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }

  .footer-row {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .site-footer nav {
    justify-content: flex-start;
  }
}

@media (max-width: 34rem) {
  .header-download {
    display: none;
  }

  .hero h1 {
    font-size: 2.75rem;
  }

  .hero-lead {
    font-size: 1.125rem;
  }

  .hero-actions {
    display: grid;
  }

  .hero-actions .button {
    width: 100%;
  }

  .proof-list {
    grid-template-columns: 1fr;
  }

  .proof-list > div,
  .proof-list > div:nth-child(3),
  .proof-list > div:nth-child(4) {
    min-height: auto;
    border-top: 1px solid var(--border);
    border-right: 1px solid var(--border);
  }

  .proof-list > div:first-child {
    border-top: 0;
  }

  .markdown-sample pre {
    min-height: 19rem;
    padding: var(--space-5);
  }

  .measurement-list > div {
    padding: var(--space-5) 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

@media (prefers-contrast: more) {
  :root {
    --border: var(--neutral-500);
  }

  .button-secondary,
  .product-shot img,
  .diagram-surface {
    border-width: 2px;
  }
}

@media print {
  .site-header,
  .hero-actions,
  .site-footer {
    display: none;
  }

  .hero,
  .section,
  .security-section,
  .closing-section {
    padding: 2rem 0;
  }

  .security-section {
    background: transparent;
    color: black;
  }
}