@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=IBM+Plex+Sans:ital,wght@0,400;0,500;0,600;0,700;1,400&family=Space+Grotesk:wght@400;500;600;700&display=swap");

:root {
  --color-obsidian: #111111;
  --color-graphite: #1e1e1e;
  --color-paper: #fafafa;
  --color-signal-orange: #ff5500;
  --color-signal-orange-hover: #d94300;
  --color-muted-steel: #a7a7a7;
  --color-line-steel: #404040;
  --color-orange-wash: #5c260f;

  --font-body: "IBM Plex Sans", Arial, sans-serif;
  --font-heading: "Space Grotesk", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.5rem;
  --text-2xl: clamp(2rem, 4vw, 3rem);
  --text-3xl: clamp(2.75rem, 6vw, 4rem);
  --text-index: clamp(3.5rem, 8vw, 5rem);

  --leading-tight: 1;
  --leading-heading: 1.1;
  --leading-body: 1.5625;
  --leading-compact: 1.35;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;
  --space-10: 8rem;

  --container-max: 77.5rem;
  --gutter: 2rem;
  --section-space: clamp(4rem, 8vw, 8rem);
  --panel-padding: 2rem;

  --border-width: 1px;
  --border: var(--border-width) solid var(--color-line-steel);
  --border-paper: var(--border-width) solid var(--color-paper);
  --border-accent: 2px solid var(--color-signal-orange);

  --radius-none: 0;
  --radius-system: 2px;

  --shadow-overlay: 0 0.75rem 2rem rgba(0, 0, 0, 0.28);
  --focus-outline: 2px solid var(--color-signal-orange);
  --focus-offset: 3px;

  --transition-fast: 160ms ease;
  --transition-base: 220ms ease;
}

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

html {
  min-width: 320px;
  background: var(--color-obsidian);
  color-scheme: dark;
  scroll-behavior: smooth;
  text-size-adjust: 100%;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background: var(--color-obsidian);
  color: var(--color-paper);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: var(--leading-body);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: var(--color-signal-orange);
  color: var(--color-obsidian);
}

:where(main, header, footer, section, article, aside, nav, form, fieldset, figure) {
  min-width: 0;
}

:where(h1, h2, h3, h4, h5, h6, p, ul, ol, dl, blockquote, figure, pre, table, fieldset) {
  margin-top: 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--color-paper);
  font-family: var(--font-heading);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: var(--leading-heading);
  text-wrap: balance;
}

h1 {
  margin-bottom: var(--space-6);
  font-size: var(--text-3xl);
  font-weight: 700;
}

h2 {
  margin-bottom: var(--space-5);
  font-size: var(--text-2xl);
}

h3 {
  margin-bottom: var(--space-4);
  font-size: var(--text-xl);
}

h4 {
  margin-bottom: var(--space-3);
  font-size: 1.125rem;
  line-height: 1.25;
}

h5,
h6 {
  margin-bottom: var(--space-2);
  font-size: var(--text-base);
  line-height: var(--leading-compact);
}

p {
  margin-bottom: var(--space-4);
}

ul,
ol {
  margin-bottom: var(--space-4);
  padding-left: 1.25rem;
}

li::marker {
  color: var(--color-signal-orange);
}

dl {
  margin-bottom: var(--space-4);
}

dt {
  color: var(--color-paper);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.04em;
  line-height: 1.35;
  text-transform: uppercase;
}

dd {
  margin: 0 0 var(--space-3);
  color: var(--color-muted-steel);
}

blockquote {
  margin-bottom: var(--space-5);
  padding: var(--space-4) 0 var(--space-4) var(--space-5);
  border-left: var(--border-accent);
  color: var(--color-paper);
  font-size: var(--text-lg);
  line-height: 1.55;
}

hr {
  height: 1px;
  margin: var(--space-6) 0;
  border: 0;
  background: var(--color-line-steel);
}

small {
  font-size: var(--text-sm);
}

strong,
b {
  font-weight: 600;
}

em,
i {
  font-style: italic;
}

code,
kbd,
samp,
pre {
  font-family: var(--font-mono);
}

code,
kbd,
samp {
  padding: 0.08em 0.3em;
  border: var(--border);
  background: var(--color-graphite);
  color: var(--color-paper);
  font-size: 0.9em;
}

pre {
  margin-bottom: var(--space-5);
  padding: var(--space-4);
  overflow-x: auto;
  border: var(--border);
  background: var(--color-graphite);
  color: var(--color-paper);
  line-height: 1.5;
}

a {
  color: var(--color-paper);
  text-decoration-color: var(--color-signal-orange);
  text-decoration-line: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  transition:
    color var(--transition-fast),
    text-decoration-thickness var(--transition-fast);
}

a:hover {
  color: var(--color-paper);
  text-decoration-thickness: 2px;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
}

img,
picture,
svg,
video,
canvas,
audio,
iframe,
embed,
object {
  display: block;
  max-width: 100%;
}

img,
video {
  height: auto;
}

img {
  font-style: italic;
}

svg {
  fill: currentColor;
}

figure {
  margin-bottom: var(--space-5);
}

figcaption {
  margin-top: var(--space-2);
  color: var(--color-muted-steel);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.35;
}

table {
  width: 100%;
  margin-bottom: var(--space-5);
  border-collapse: collapse;
  border: var(--border);
  font-variant-numeric: tabular-nums;
}

caption {
  margin-bottom: var(--space-2);
  color: var(--color-muted-steel);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-align: left;
}

th,
td {
  padding: var(--space-3) var(--space-4);
  border: var(--border);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--color-paper);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

td {
  color: var(--color-muted-steel);
}

button,
input,
select,
textarea {
  margin: 0;
  border-radius: var(--radius-none);
  color: inherit;
  font: inherit;
}

button,
select {
  text-transform: none;
}

button,
[type="button"],
[type="reset"],
[type="submit"] {
  appearance: none;
  cursor: pointer;
}

button:disabled,
[type="button"]:disabled,
[type="reset"]:disabled,
[type="submit"]:disabled,
input:disabled,
select:disabled,
textarea:disabled {
  cursor: not-allowed;
  border-color: var(--color-line-steel);
  color: var(--color-muted-steel);
  opacity: 0.7;
}

input,
select,
textarea {
  width: 100%;
  min-width: 0;
  border: var(--border);
  background: var(--color-graphite);
  color: var(--color-paper);
  font-size: var(--text-base);
  line-height: 1.5;
  transition:
    border-color var(--transition-fast),
    background-color var(--transition-fast);
}

input,
select {
  min-height: 3rem;
  padding: 0.6875rem var(--space-3);
}

textarea {
  min-height: 8rem;
  padding: var(--space-3);
  resize: vertical;
}

input::placeholder,
textarea::placeholder {
  color: var(--color-muted-steel);
  opacity: 1;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--color-signal-orange);
}

select {
  cursor: pointer;
}

input[type="checkbox"],
input[type="radio"] {
  width: 1.125rem;
  min-width: 1.125rem;
  height: 1.125rem;
  min-height: 1.125rem;
  padding: 0;
  accent-color: var(--color-signal-orange);
}

input[type="file"] {
  padding: var(--space-2);
}

input[type="file"]::file-selector-button {
  margin-right: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border: 0;
  border-right: var(--border);
  background: var(--color-obsidian);
  color: var(--color-paper);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

label,
legend {
  color: var(--color-paper);
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1.4;
}

label {
  display: inline-block;
  margin-bottom: var(--space-2);
}

fieldset {
  margin-bottom: var(--space-5);
  padding: var(--space-4);
  border: var(--border);
}

legend {
  padding: 0 var(--space-2);
}

output {
  color: var(--color-paper);
}

progress {
  width: 100%;
  height: 0.5rem;
  accent-color: var(--color-signal-orange);
}

details {
  margin-bottom: var(--space-3);
  border-top: var(--border);
  border-bottom: var(--border);
}

summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  min-height: 3rem;
  padding: var(--space-3) 0;
  color: var(--color-paper);
  cursor: pointer;
  font-weight: 500;
}

summary::marker {
  color: var(--color-signal-orange);
}

details > :not(summary) {
  margin-right: var(--space-4);
  margin-left: var(--space-4);
}

.container {
  width: min(100% - (var(--gutter) * 2), var(--container-max));
  margin-inline: auto;
}

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

.surface {
  border: var(--border);
  background: var(--color-graphite);
}

.panel {
  padding: var(--panel-padding);
  border: var(--border);
  background: var(--color-graphite);
}

.panel > :last-child,
.surface > :last-child {
  margin-bottom: 0;
}

.stack {
  display: flex;
  min-width: 0;
  flex-direction: column;
  align-items: stretch;
  gap: var(--space-4);
}

.stack--compact {
  gap: var(--space-2);
}

.stack--loose {
  gap: var(--space-6);
}

.cluster {
  display: flex;
  min-width: 0;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

.cluster > * {
  min-width: 0;
}

.cluster--compact {
  gap: var(--space-2);
}

.cluster--spacious {
  gap: var(--space-5);
}

.button {
  display: inline-flex;
  min-height: 2.75rem;
  max-width: 100%;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.6875rem var(--space-4);
  border: 1px solid var(--color-signal-orange);
  background: var(--color-signal-orange);
  color: var(--color-obsidian);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  text-transform: uppercase;
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast);
}

.button:hover {
  border-color: var(--color-signal-orange-hover);
  background: var(--color-signal-orange-hover);
  color: var(--color-obsidian);
  text-decoration: none;
  transform: translateY(-2px);
}

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

.button--secondary {
  border-color: var(--color-paper);
  background: transparent;
  color: var(--color-paper);
}

.button--secondary:hover {
  border-color: var(--color-paper);
  background: var(--color-paper);
  color: var(--color-obsidian);
}

.button--full {
  width: 100%;
}

.eyebrow,
.label,
.meta,
.index {
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  line-height: 1.35;
  text-transform: uppercase;
}

.eyebrow,
.label {
  color: var(--color-muted-steel);
  font-size: var(--text-xs);
  font-weight: 500;
}

.meta {
  color: var(--color-muted-steel);
  font-size: var(--text-xs);
}

.index {
  color: var(--color-signal-orange);
  font-size: var(--text-index);
  font-weight: 500;
  letter-spacing: -0.07em;
  line-height: var(--leading-tight);
}

.text-muted {
  color: var(--color-muted-steel);
}

.rule {
  width: 100%;
  height: 1px;
  border: 0;
  background: var(--color-line-steel);
}

.technical-surface {
  background-color: var(--color-graphite);
  background-image:
    linear-gradient(to right, rgba(64, 64, 64, 0.16) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(64, 64, 64, 0.12) 1px, transparent 1px);
  background-size: 2rem 2rem;
}

.content-list {
  margin-bottom: var(--space-4);
  padding-left: 1.25rem;
}

.content-list > .content-group > :last-child {
  margin-bottom: 0;
}

@media (max-width: 63.9375rem) {
  :root {
    --gutter: 1.5rem;
    --section-space: clamp(4.5rem, 9vw, 6rem);
    --panel-padding: 1.5rem;
  }

  h1 {
    margin-bottom: var(--space-5);
  }
}

@media (max-width: 47.9375rem) {
  :root {
    --gutter: 1.125rem;
    --section-space: clamp(3.5rem, 12vw, 4.5rem);
    --panel-padding: 1.25rem;
  }

  h1 {
    font-size: clamp(2.25rem, 11vw, 3rem);
    line-height: 1.04;
  }

  h2 {
    font-size: clamp(1.875rem, 8vw, 2.25rem);
    line-height: 1.08;
  }

  h3 {
    font-size: 1.375rem;
  }

  .button {
    min-height: 3rem;
  }

  .button--full-mobile {
    width: 100%;
  }

  th,
  td {
    padding: var(--space-3);
  }
}