:root {
  --bg: #0b0f14;
  --bg-elevated: #111720;
  --bg-soft: #16202a;
  --surface: rgba(18, 24, 33, 0.9);
  --surface-soft: rgba(22, 32, 42, 0.82);
  --surface-strong: #1a2430;
  --text: #e6edf3;
  --muted: #9caabc;
  --accent: #5f9ea8;
  --accent-strong: #7ab8c2;
  --accent-soft: rgba(95, 158, 168, 0.18);
  --border: rgba(230, 237, 243, 0.12);
  --border-strong: rgba(230, 237, 243, 0.2);
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.32);
  --radius-sm: 0.75rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --max-width: 74rem;
  --nav-height: 4.5rem;
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(95, 158, 168, 0.12), transparent 28rem),
    linear-gradient(180deg, #0d1218 0%, var(--bg) 24%, #0a0e13 100%);
  font-family: "Aptos", "Segoe UI", "Helvetica Neue", sans-serif;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
  text-decoration-color: rgba(122, 184, 194, 0.45);
  text-underline-offset: 0.18em;
}

a:hover {
  text-decoration-color: var(--accent-strong);
}

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

button {
  cursor: pointer;
}

code,
pre {
  font-family: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
}

.skip-link,
.sr-only {
  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:focus {
  width: auto;
  height: auto;
  clip: auto;
  margin: var(--space-3);
  padding: 0.65rem 1rem;
  z-index: 1000;
  background: var(--surface-strong);
  color: var(--text);
  border-radius: var(--radius-sm);
  outline: 2px solid var(--accent-strong);
}

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

.section {
  position: relative;
  padding: var(--space-7) 0;
  scroll-margin-top: calc(var(--nav-height) + 1rem);
}

.section-soft {
  background:
    linear-gradient(180deg, rgba(22, 32, 42, 0.5), rgba(22, 32, 42, 0.28)),
    rgba(255, 255, 255, 0.01);
  border-top: 1px solid rgba(230, 237, 243, 0.05);
  border-bottom: 1px solid rgba(230, 237, 243, 0.05);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(11, 15, 20, 0.8);
  border-bottom: 1px solid rgba(230, 237, 243, 0.08);
}

.nav-shell {
  min-height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand {
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.site-nav {
  min-width: 0;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.site-nav ul::-webkit-scrollbar {
  display: none;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 0.8rem;
  border-radius: 999px;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms ease, background-color 180ms ease;
}

.site-nav a:hover,
.site-nav a:focus-visible,
.site-nav a.is-active {
  color: var(--text);
  background: rgba(230, 237, 243, 0.08);
}

.hero {
  padding-top: calc(var(--space-7) + 1rem);
}

.hero-grid,
.install-layout,
.citation-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(18rem, 0.95fr);
  gap: var(--space-5);
  align-items: start;
}

.hero-copy h1,
.section-heading h2,
.hero-panel h2 {
  margin: 0;
  line-height: 1.06;
  letter-spacing: -0.025em;
  font-family: inherit;
  font-weight: 800;
}

.hero-copy h1 {
  font-size: clamp(2.9rem, 6vw, 5rem);
  max-width: 12ch;
}

.section-heading h2,
.hero-panel h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

.eyebrow,
.panel-label,
.equation-label {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  width: fit-content;
  margin: 0 0 var(--space-2);
  padding: 0.38rem 0.82rem;
  color: #b7c6d2;
  font-size: 0.96rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  background: rgba(95, 158, 168, 0.1);
  border: 1px solid rgba(122, 184, 194, 0.16);
  border-radius: 999px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

.eyebrow::before,
.panel-label::before,
.equation-label::before {
  content: "";
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: rgba(122, 184, 194, 0.78);
  box-shadow: 0 0 0 0.22rem rgba(95, 158, 168, 0.12);
}

.hero-subtitle {
  margin: var(--space-4) 0 var(--space-3);
  max-width: 42rem;
  color: var(--text);
  font-size: clamp(1.1rem, 2vw, 1.4rem);
}

.hero-text,
.section-lead,
.code-note,
.plain-citation,
figcaption {
  color: var(--muted);
}

.hero-actions,
.pill-row,
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.hero-actions {
  margin-top: var(--space-5);
}

.button,
.copy-button,
.pending-link,
.resource-card a,
.back-to-top,
.lightbox-close {
  border: 1px solid var(--border);
  border-radius: 999px;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background-color 180ms ease,
    color 180ms ease,
    box-shadow 180ms ease;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  padding: 0.8rem 1.15rem;
  text-decoration: none;
}

.button-primary {
  background: var(--accent);
  border-color: transparent;
  color: #071016;
  box-shadow: 0 12px 24px rgba(95, 158, 168, 0.24);
}

.button-secondary {
  background: rgba(230, 237, 243, 0.03);
}

.button:hover,
.button:focus-visible,
.copy-button:hover,
.copy-button:focus-visible,
.resource-card a:hover,
.resource-card a:focus-visible,
.back-to-top:hover,
.back-to-top:focus-visible,
.lightbox-close:hover,
.lightbox-close:focus-visible {
  transform: translateY(-1px);
  border-color: var(--border-strong);
}

.copy-button,
.lightbox-close {
  padding: 0.55rem 0.9rem;
  background: rgba(230, 237, 243, 0.04);
  color: var(--text);
}

.copy-button.is-copied {
  border-color: rgba(122, 184, 194, 0.55);
  color: var(--accent-strong);
}

.install-chip {
  margin-top: var(--space-4);
  width: fit-content;
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: 0.55rem 0.65rem 0.55rem 0.9rem;
  border-radius: 999px;
  background: rgba(230, 237, 243, 0.04);
  border: 1px solid var(--border);
}

.install-chip code {
  color: var(--text);
}

.hero-meta {
  margin-top: var(--space-4);
  color: var(--muted);
  font-size: 0.94rem;
}

.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.hero-meta span::before {
  content: "";
  width: 0.32rem;
  height: 0.32rem;
  border-radius: 50%;
  background: var(--accent);
}

.card {
  position: relative;
  padding: var(--space-5);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero-panel {
  background:
    linear-gradient(180deg, rgba(95, 158, 168, 0.1), rgba(17, 23, 32, 0.92) 30%),
    rgba(17, 23, 32, 0.96);
}

.feature-list,
.keyfacts-list {
  margin: var(--space-4) 0 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

.feature-list li + li,
.keyfacts-list li + li {
  margin-top: 0.7rem;
}

.pill-row {
  margin-top: var(--space-4);
}

.pill {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  border: 1px solid rgba(122, 184, 194, 0.2);
  background: var(--accent-soft);
  color: var(--text);
  font-size: 0.92rem;
}

.section-heading {
  max-width: 48rem;
  margin-bottom: var(--space-5);
}

.section-heading .section-lead {
  margin-top: var(--space-3);
}

.info-grid,
.steps-grid,
.resource-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
}

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

.step-card {
  min-height: 15rem;
}

.step-number {
  display: inline-block;
  margin-bottom: var(--space-3);
  color: var(--accent-strong);
  font-weight: 700;
  letter-spacing: 0.08em;
}

.figure-card,
.result-card {
  overflow: hidden;
}

.figure-card-wide {
  padding: var(--space-4);
}

.figure-media {
  width: 100%;
  padding: 0;
  display: grid;
  place-items: center;
  min-height: 18rem;
  border: 1px solid rgba(230, 237, 243, 0.08);
  border-radius: calc(var(--radius-lg) - 0.35rem);
  background:
    linear-gradient(180deg, rgba(95, 158, 168, 0.08), rgba(255, 255, 255, 0.02)),
    var(--bg-elevated);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03);
  overflow: hidden;
}

.figure-card .figure-media {
  min-height: min(44rem, 62vw);
}

.figure-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
  opacity: 0;
  transition: opacity 240ms ease;
}

.figure-media.is-ready .figure-image {
  opacity: 1;
}

.figure-media.is-missing {
  border-style: dashed;
  border-color: rgba(122, 184, 194, 0.26);
  cursor: default;
}

.figure-placeholder {
  max-width: 34rem;
  padding: var(--space-4);
  color: var(--muted);
  text-align: center;
}

.figure-placeholder.is-visible {
  display: block;
}

figcaption {
  margin-top: var(--space-3);
  font-size: 0.98rem;
}

.math-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(16rem, 0.85fr);
  gap: var(--space-4);
  align-items: start;
  margin-bottom: var(--space-4);
}

.equation-card p:last-child {
  margin-bottom: 0;
}

.equation-block {
  margin: var(--space-3) 0 var(--space-4);
  padding: 1.2rem;
  border-radius: var(--radius-md);
  background: rgba(7, 16, 22, 0.55);
  border: 1px solid rgba(122, 184, 194, 0.18);
  overflow-x: auto;
}

.table-shell {
  padding: 0;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 42rem;
}

caption {
  padding: var(--space-4) var(--space-5) 0;
  text-align: left;
  color: var(--muted);
  font-size: 0.95rem;
}

th,
td {
  padding: 1rem 1.2rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid rgba(230, 237, 243, 0.08);
}

th {
  color: var(--text);
  font-weight: 600;
}

thead th {
  color: var(--accent-strong);
  font-size: 0.94rem;
  letter-spacing: 0.02em;
}

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

.results-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
}

.result-card {
  display: grid;
  gap: var(--space-4);
}

.result-copy h3,
.resource-card h3,
.install-panel h3,
.citation-card h3 {
  margin-top: 0;
}

.install-panel {
  margin-top: var(--space-4);
}

.install-availability {
  margin-top: var(--space-4);
}

.install-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.code-card {
  align-self: end;
}

.code-block {
  margin: 0;
  padding: 1.1rem 1.15rem;
  overflow-x: auto;
  border-radius: var(--radius-md);
  background: rgba(7, 16, 22, 0.7);
  border: 1px solid rgba(230, 237, 243, 0.08);
  color: var(--text);
}

.code-note {
  margin-top: var(--space-3);
}

.availability-pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.availability-pills a {
  display: inline-flex;
  align-items: center;
  min-height: 2.6rem;
  padding: 0.68rem 0.95rem;
  border-radius: 999px;
  border: 1px solid rgba(122, 184, 194, 0.18);
  background: rgba(95, 158, 168, 0.09);
  text-decoration: none;
  color: var(--text);
}

.availability-pills a:hover,
.availability-pills a:focus-visible {
  border-color: rgba(122, 184, 194, 0.38);
  background: rgba(95, 158, 168, 0.14);
}

.resource-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.resource-card a,
.pending-link {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding: 0.7rem 1rem;
  text-decoration: none;
  background: rgba(230, 237, 243, 0.04);
}

.resource-card-pending {
  background:
    linear-gradient(180deg, rgba(230, 237, 243, 0.03), rgba(22, 32, 42, 0.88)),
    var(--surface);
}

.pending-link {
  color: var(--muted);
  cursor: default;
}

.plain-citation {
  margin-bottom: 0;
}

.site-footer {
  padding: var(--space-5) 0 var(--space-6);
  border-top: 1px solid rgba(230, 237, 243, 0.06);
}

.footer-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  color: var(--muted);
}

.back-to-top {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 14;
  padding: 0.75rem 0.95rem;
  background: rgba(17, 23, 32, 0.95);
  color: var(--text);
  opacity: 0;
  pointer-events: none;
  transform: translateY(0.6rem);
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: grid;
  place-items: center;
  padding: 1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease;
}

.lightbox.is-open {
  opacity: 1;
  pointer-events: auto;
}

.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(4, 7, 11, 0.82);
  backdrop-filter: blur(10px);
}

.lightbox-dialog {
  position: relative;
  width: min(100%, 72rem);
  max-height: calc(100vh - 2rem);
  padding: 1rem;
  border: 1px solid rgba(230, 237, 243, 0.1);
  border-radius: var(--radius-lg);
  background: rgba(11, 15, 20, 0.96);
  box-shadow: var(--shadow);
}

.lightbox-image {
  width: 100%;
  max-height: calc(100vh - 8rem);
  object-fit: contain;
}

.lightbox-caption {
  margin: var(--space-3) 0 0;
  color: var(--muted);
}

.lightbox-close {
  margin-left: auto;
  margin-bottom: var(--space-3);
  display: inline-flex;
}

body.lightbox-open {
  overflow: hidden;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 500ms ease, transform 500ms ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

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

@media (max-width: 68rem) {
  .resource-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 56rem) {
  .hero-grid,
  .install-layout,
  .citation-layout,
  .math-layout,
  .results-grid,
  .info-grid,
  .steps-grid,
  .resource-grid {
    grid-template-columns: 1fr;
  }

  .site-header {
    position: sticky;
  }
}

@media (max-width: 42rem) {
  :root {
    --space-7: 3.4rem;
    --nav-height: 4.1rem;
  }

  body {
    font-size: 0.98rem;
  }

  .container {
    width: min(calc(100% - 1.1rem), var(--max-width));
  }

  .card {
    padding: var(--space-4);
  }

  .nav-shell {
    gap: var(--space-3);
  }

  .hero-copy h1 {
    max-width: 10ch;
  }

  .button,
  .copy-button,
  .resource-card a,
  .pending-link {
    width: 100%;
    justify-content: center;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .install-panel-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .install-panel-head .copy-button,
  .install-chip .copy-button {
    width: auto;
  }

  .install-chip {
    width: 100%;
    border-radius: var(--radius-md);
    justify-content: space-between;
  }

  .install-chip code {
    max-width: 100%;
    overflow-wrap: anywhere;
  }

  .footer-shell {
    flex-direction: column;
    align-items: flex-start;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}