:root {
  color-scheme: light;

  --color-primary: #3b4151;
  --color-primary-dark: #2a2f3c;
  --color-primary-light: #565e72;

  --color-secondary: #49cc90;
  --color-secondary-dark: #2fa878;

  --color-accent: #f93e3e;
  --color-highlight: #ffff00;

  --color-success: #49cc90;
  --color-warning: #f5a623;
  --color-danger: #f93e3e;
  --color-info: #3b82f6;

  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-surface-alt: #ebebeb;
  --color-surface-sunken: #f4f4f4;
  --color-border: #d9dde3;
  --color-border-strong: #c2c7cf;

  --color-ink: #111111;
  --color-text: #3b4151;
  --color-text-muted: #676e7c;
  --color-text-faint: #9aa0ab;
  --color-on-primary: #ffffff;
  --color-on-secondary: #0b2b20;
  --color-ribbon: #151513;

  --font-sans: "Open Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-display: "Titillium Web", "Open Sans", -apple-system, sans-serif;
  --font-mono: "Source Code Pro", ui-monospace, "SFMono-Regular", Consolas, monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;

  --leading-tight: 1.2;
  --leading-snug: 1.35;
  --leading-normal: 1.6;

  --tracking-tight: -0.015em;
  --tracking-wide: 0.05em;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 2.5rem;
  --space-8: 3rem;
  --space-9: 4rem;
  --space-10: 5rem;
  --space-12: 6rem;

  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 10px;
  --radius-xl: 16px;
  --radius-full: 999px;

  --shadow-xs: 0 1px 2px rgba(17, 17, 17, 0.06);
  --shadow-sm: 0 1px 3px rgba(17, 17, 17, 0.08), 0 1px 2px rgba(17, 17, 17, 0.05);
  --shadow-md: 0 4px 12px rgba(17, 17, 17, 0.09), 0 2px 4px rgba(17, 17, 17, 0.05);
  --shadow-lg: 0 12px 32px rgba(17, 17, 17, 0.13), 0 4px 8px rgba(17, 17, 17, 0.06);

  --container-max: 1120px;
  --container-narrow: 720px;

  --header-height: 60px;

  --duration-fast: 150ms;
  --duration-base: 250ms;
  --duration-slow: 600ms;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;

    --color-primary: #7b85a0;
    --color-primary-dark: #5b6478;
    --color-primary-light: #9aa3ba;

    --color-bg: #14161a;
    --color-surface: #1c1f26;
    --color-surface-alt: #23272f;
    --color-surface-sunken: #171a1f;
    --color-border: #333842;
    --color-border-strong: #454b57;

    --color-ink: #f5f7fa;
    --color-text: #d6dae1;
    --color-text-muted: #9aa3b0;
    --color-text-faint: #6b7480;
    --color-on-primary: #11151c;
    --color-on-secondary: #06231a;

    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.45);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.55);
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-display);
  font-weight: 600;
  line-height: var(--leading-tight);
  color: var(--color-ink);
  letter-spacing: var(--tracking-tight);
}

h1 {
  font-size: var(--text-3xl);
}

h2 {
  font-size: var(--text-2xl);
}

h3 {
  font-size: var(--text-xl);
}

h4 {
  font-size: var(--text-lg);
}

p {
  margin: 0 0 var(--space-4);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

a:hover {
  color: var(--color-secondary-dark);
  text-decoration: underline;
}

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

ul,
ol {
  margin: 0 0 var(--space-4);
  padding-left: var(--space-5);
}

hr {
  border: 0;
  border-top: 1px solid var(--color-border);
  margin: var(--space-6) 0;
}

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

code {
  font-size: 0.9em;
  background: var(--color-surface-alt);
  color: var(--color-ink);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-xs);
}

pre {
  margin: 0 0 var(--space-4);
  padding: var(--space-4);
  overflow-x: auto;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  line-height: var(--leading-snug);
  color: var(--color-ink);
}

pre code {
  background: none;
  padding: 0;
}

:focus-visible {
  outline: 2px solid var(--color-secondary-dark);
  outline-offset: 2px;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.container-narrow {
  width: 100%;
  max-width: var(--container-narrow);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.section {
  padding-block: var(--space-8);
}

.section-alt {
  background: var(--color-surface-alt);
}

.grid {
  display: grid;
  gap: var(--space-5);
}

.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: 1fr;
}

.stack > * + * {
  margin-top: var(--space-4);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: saturate(180%) blur(8px);
}

.site-header .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  padding-block: var(--space-2);
  gap: var(--space-2) var(--space-4);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: var(--tracking-tight);
}

.brand:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
}

.brand-version {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 300;
  color: var(--color-text-faint);
}

.site-nav {
  display: block;
  flex: 1 1 auto;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-link {
  display: block;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  background: var(--color-surface-alt);
  color: var(--color-ink);
  text-decoration: none;
}

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 40px;
  height: 40px;
  padding: 0 9px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  height: 2px;
  width: 100%;
  border-radius: var(--radius-full);
  background: var(--color-ink);
}

.site-footer {
  margin-top: var(--space-9);
  background: var(--color-primary-dark);
  color: #cfd4de;
  padding-block: var(--space-8) var(--space-5);
}

.footer-grid {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;
}

.footer-col .brand {
  color: #ffffff;
}

.footer-heading {
  margin: 0 0 var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: #ffffff;
}

.footer-tagline {
  margin: var(--space-2) 0 0;
  font-size: var(--text-sm);
  color: #aab2c0;
  max-width: 34ch;
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.footer-links a {
  font-size: var(--text-sm);
  color: #cfd4de;
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-bottom {
  margin-top: var(--space-7);
  padding-top: var(--space-4);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  justify-content: space-between;
  font-size: var(--text-xs);
  color: #9aa3b0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

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

.btn-primary {
  background: var(--color-primary);
  color: var(--color-on-primary);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: var(--color-on-primary);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-primary);
  border-color: var(--color-border-strong);
}

.btn-secondary:hover {
  background: var(--color-surface-alt);
  color: var(--color-primary-dark);
}

.btn-accent {
  background: var(--color-secondary);
  color: var(--color-on-secondary);
}

.btn-accent:hover {
  background: var(--color-secondary-dark);
  color: var(--color-on-secondary);
}

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border-color: transparent;
}

.btn-ghost:hover {
  background: var(--color-surface-alt);
}

.btn-sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
}

.btn-lg {
  padding: var(--space-4) var(--space-6);
  font-size: var(--text-base);
}

.btn-block {
  width: 100%;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xs);
  overflow: hidden;
}

.card-header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.card-header h3,
.card-header h4 {
  margin: 0;
}

.card-body {
  padding: var(--space-5);
}

.card-footer {
  padding: var(--space-3) var(--space-5);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface-sunken);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  background: var(--color-surface-alt);
  color: var(--color-text);
}

.badge-success {
  background: rgba(73, 204, 144, 0.18);
  color: var(--color-secondary-dark);
}

.badge-danger {
  background: rgba(249, 62, 62, 0.16);
  color: var(--color-danger);
}

.badge-warning {
  background: rgba(245, 166, 35, 0.2);
  color: #a86b00;
}

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

.text-center {
  text-align: center;
}

.mono {
  font-family: var(--font-mono);
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--duration-slow) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

.fade-up {
  animation: fadeUp var(--duration-slow) var(--ease-out) both;
}

.fade-in {
  animation: fadeIn var(--duration-base) var(--ease-out) both;
}

.scale-up {
  animation: scaleUp var(--duration-base) var(--ease-out) both;
}

.spin {
  animation: rotation 900ms linear infinite;
}

.blink {
  animation: blinker 1s step-end infinite;
}

.shake {
  animation: shake 600ms var(--ease-in-out) both;
}

.marquee {
  display: flex;
  overflow: hidden;
  animation: marquee 24s linear infinite;
}

@keyframes fadeUp {
  0% {
    transform: translateY(16px);
    opacity: 0;
  }
  100% {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes fadeIn {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

@keyframes rotation {
  100% {
    transform: rotate(1turn);
  }
}

@keyframes blinker {
  50% {
    opacity: 0;
  }
}

@keyframes shake {
  10%,
  90% {
    transform: translate3d(-1px, 0, 0);
  }
  20%,
  80% {
    transform: translate3d(2px, 0, 0);
  }
  30%,
  50%,
  70% {
    transform: translate3d(-4px, 0, 0);
  }
  40%,
  60% {
    transform: translate3d(4px, 0, 0);
  }
}

@keyframes scaleUp {
  0% {
    transform: scale(0.8);
    opacity: 0;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes marquee {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-50%);
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

@media (min-width: 640px) {
  h1 {
    font-size: var(--text-4xl);
  }

  h2 {
    font-size: var(--text-3xl);
  }

  .container,
  .container-narrow {
    padding-inline: var(--space-5);
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 768px) {
  .section {
    padding-block: var(--space-9);
  }

  .footer-grid {
    grid-template-columns: 2fr repeat(3, 1fr);
  }

  .footer-bottom {
    flex-direction: row;
    align-items: center;
  }
}

@media (min-width: 1024px) {
  h1 {
    font-size: var(--text-5xl);
  }

  .container,
  .container-narrow {
    padding-inline: var(--space-6);
  }

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

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