:root {
  --bg: #eff7f6;
  --surface: #ffffff;
  --line: #d3e5e4;
  --text: #1d2a2c;
  --text-muted: #4a5d60;
  --heading: #10363b;
  --accent: #46b8b9;
  --accent-text: #0c666d;
  --button: #0d5f67;
  --button-text: #ffffff;
  --button-hover: #0a4c53;

  --band: #c6eef0;
  --band-text: #1b3236;
  --band-muted: #3b5a5e;
  --band-heading: #10363b;
  --band-accent: #0b5f66;
  --band-panel: rgb(255 255 255 / 0.55);
  --band-line: rgb(16 54 59 / 0.14);
  --band-grid: rgb(16 54 59 / 0.05);
  --glow-1: rgb(255 255 255 / 0.55);
  --glow-2: rgb(70 184 185 / 0.22);

  --footer: #10363b;
  --footer-text: #bcd8da;
  --footer-strong: #ffffff;

  --focus: var(--accent-text);

  --font-display: "Frank Ruhl Libre", "Times New Roman", serif;
  --font-body: "Heebo", "Arial Hebrew", Arial, sans-serif;

  --radius: 14px;
  --shadow: 0 1px 2px rgb(16 54 59 / 0.06), 0 12px 32px -12px rgb(16 54 59 / 0.18);
  --header-h: 72px;

  color-scheme: light;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 12px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--font-display);
  line-height: 1.2;
  text-wrap: balance;
}

p {
  margin: 0;
  text-wrap: pretty;
}

a {
  color: inherit;
}

ul,
ol,
dl,
dd,
figure {
  margin: 0;
  padding: 0;
}

ul,
ol {
  list-style: none;
}

address {
  font-style: normal;
}

.hero,
.contact {
  --focus: var(--band-accent);
}

.site-footer {
  --focus: var(--footer-strong);
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 4px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.icon {
  width: 1.25em;
  height: 1.25em;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.container {
  width: 100%;
  max-width: 1140px;
  margin-inline: auto;
  padding-inline: 24px;
}

.skip {
  position: absolute;
  inset-inline-start: 12px;
  top: -100px;
  z-index: 100;
  padding: 10px 16px;
  background: var(--band);
  color: var(--band-text);
  border-radius: 8px;
  text-decoration: none;
}

.skip:focus {
  top: 12px;
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 10px 22px;
  border: 1.5px solid transparent;
  border-radius: 999px;
  font: 500 1rem/1.2 var(--font-body);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 0.2s, border-color 0.2s, color 0.2s, transform 0.2s;
}

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

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

.btn-primary:hover {
  background: var(--button-hover);
}

.btn-ghost {
  border-color: currentColor;
  color: inherit;
}

.btn-ghost:hover {
  background: color-mix(in srgb, currentColor 8%, transparent);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgb(255 255 255 / 0.92);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}

.site-header .bar {
  display: flex;
  align-items: center;
  gap: 32px;
  min-height: var(--header-h);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand .mark {
  width: 42px;
  height: 42px;
}

.brand .name {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand strong {
  font: 700 1.375rem/1.1 var(--font-display);
  color: var(--heading);
}

.brand small {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.site-header nav {
  margin-inline-start: auto;
}

.site-header nav ul {
  display: flex;
  gap: 28px;
}

.site-header nav a {
  position: relative;
  padding-block: 6px;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
}

.site-header nav a::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform 0.2s;
}

.site-header nav a:hover::after {
  transform: scaleX(1);
}

.site-header .tools {
  display: flex;
  align-items: center;
  gap: 10px;
}

.site-header .tools .btn {
  min-height: 44px;
  padding-inline: 16px;
}

.site-header .lang {
  border-color: var(--line);
  background: transparent;
  color: var(--text);
  font-size: 0.9375rem;
  cursor: pointer;
}

.site-header .lang:hover {
  border-color: var(--accent);
}

/* Hero */

.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(900px 420px at 85% -10%, var(--glow-1), transparent 60%),
    radial-gradient(700px 500px at 0% 110%, var(--glow-2), transparent 60%),
    var(--band);
  color: var(--band-text);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(var(--band-grid) 1px, transparent 1px), linear-gradient(90deg, var(--band-grid) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: linear-gradient(to bottom, black, transparent 85%);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.35fr 0.85fr;
  align-items: center;
  gap: 64px;
  padding-block: 96px 104px;
}

.hero .eyebrow {
  margin-bottom: 20px;
  color: var(--band-accent);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.hero h1 {
  font-size: clamp(2.75rem, 6vw, 4.5rem);
  font-weight: 900;
  color: var(--band-heading);
}

.hero h1 .sub {
  display: block;
  margin-top: 6px;
  font-size: 0.5em;
  font-weight: 500;
  color: var(--band-muted);
}

.hero .lede {
  max-width: 34em;
  margin-block: 28px 36px;
  font-size: 1.1875rem;
  color: var(--band-text);
}

.stats {
  padding: 8px 32px;
  background: var(--band-panel);
  border: 1px solid var(--band-line);
  border-radius: var(--radius);
  backdrop-filter: blur(4px);
}

.stats div {
  display: flex;
  flex-direction: column-reverse;
  gap: 2px;
  padding-block: 22px;
}

.stats div + div {
  border-top: 1px solid var(--band-line);
}

.stats dd {
  font: 900 2.25rem/1.1 var(--font-display);
  color: var(--band-accent);
}

.stats dt {
  color: var(--band-muted);
}

/* Sections */

.section {
  padding-block: 104px;
}

.kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
  color: var(--accent-text);
  font-weight: 700;
  font-size: 0.9375rem;
}

.kicker::before {
  content: "";
  width: 32px;
  height: 2px;
  background: currentColor;
}

.section h2 {
  margin-bottom: 28px;
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  color: var(--heading);
}

.split {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  align-items: start;
  gap: 72px;
}

.text p + p {
  margin-top: 18px;
}

/* About */

.about .text {
  max-width: 36em;
}

.areas {
  padding: 36px;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.areas h3 {
  margin-bottom: 22px;
  font-size: 1.375rem;
  color: var(--heading);
}

.areas ul {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.areas li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  background: var(--bg);
  border-radius: 10px;
  font-weight: 500;
}

.areas li .icon {
  width: 26px;
  height: 26px;
  color: var(--accent-text);
}

.areas .more {
  margin-top: 16px;
  color: var(--text-muted);
}

/* Why */

.why {
  background: var(--surface);
}

.why .intro {
  max-width: 40em;
  font-size: 1.1875rem;
  color: var(--text-muted);
}

.values {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.values li {
  padding: 28px 24px 30px;
  background: var(--bg);
  border-top: 3px solid var(--accent);
  border-radius: 0 0 var(--radius) var(--radius);
  font: 700 1.25rem/1.35 var(--font-display);
  color: var(--heading);
}

.values .num {
  display: block;
  margin-bottom: 14px;
  font: 900 2rem/1 var(--font-display);
  color: var(--accent-text);
}

/* Class action */

.explain .note {
  margin-top: 32px;
  padding: 24px 28px;
  background: var(--surface);
  border-inline-start: 3px solid var(--accent);
  border-radius: var(--radius);
  border-start-start-radius: 0;
  border-end-start-radius: 0;
}

.explain .note h3 {
  margin-bottom: 8px;
  font-size: 1.25rem;
  color: var(--heading);
}

.example {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  padding: 36px;
  background: var(--band);
  color: var(--band-text);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.example figcaption {
  margin-bottom: 24px;
  color: var(--band-accent);
  font-weight: 700;
}

.equation {
  display: grid;
  gap: 6px;
  margin-bottom: 24px;
}

.equation .term {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 18px;
  background: var(--band-panel);
  border-radius: 10px;
}

.equation strong {
  font: 900 1.625rem/1.2 var(--font-display);
  color: var(--band-heading);
}

.equation .term span {
  color: var(--band-muted);
}

.equation .total {
  background: var(--button);
}

.equation .total strong,
.equation .total span {
  color: var(--button-text);
}

.equation .op {
  justify-self: center;
  font: 700 1.5rem/1 var(--font-display);
  color: var(--band-accent);
}

.example p {
  color: var(--band-muted);
  font-size: 0.9875rem;
}

/* Contact */

.contact {
  background: var(--band);
  color: var(--band-text);
}

.contact .kicker {
  color: var(--band-accent);
}

.contact h2 {
  color: var(--band-heading);
}

.contact .cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.contact .card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 32px;
  background: var(--band-panel);
  border: 1px solid var(--band-line);
  border-radius: var(--radius);
}

.contact .card > .icon {
  width: 28px;
  height: 28px;
  margin-bottom: 16px;
  color: var(--band-accent);
}

.contact .card h3 {
  margin-bottom: 4px;
  font: 500 1rem/1.4 var(--font-body);
  color: var(--band-muted);
}

.contact .card .value {
  margin-bottom: 24px;
  font: 700 1.5rem/1.35 var(--font-display);
  color: var(--band-heading);
  text-decoration: none;
}

.contact .card a.value:hover {
  text-decoration: underline;
}

.contact .card .actions {
  align-self: stretch;
  margin-top: auto;
}

/* Footer */

.site-footer {
  background: var(--footer);
  color: var(--footer-text);
  font-size: 0.9375rem;
}

.site-footer .bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  padding-block: 28px;
}

.site-footer strong {
  color: var(--footer-strong);
  font-weight: 500;
}

.site-footer a {
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

/* Responsive */

@media (max-width: 960px) {
  .site-header nav {
    display: none;
  }

  .site-header .tools {
    margin-inline-start: auto;
  }

  .hero-grid,
  .split,
  .contact .cards {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .contact .cards {
    gap: 16px;
  }

  .hero-grid {
    padding-block: 72px 80px;
  }

  .values {
    grid-template-columns: 1fr 1fr;
  }

  .example {
    position: static;
  }

  .section {
    padding-block: 80px;
  }
}

@media (max-width: 560px) {
  :root {
    --header-h: 64px;
  }

  .container {
    padding-inline: 16px;
  }

  body {
    font-size: 1rem;
  }

  .brand .mark {
    width: 38px;
    height: 38px;
  }

  .brand small {
    display: none;
  }

  .site-header .tools .btn {
    width: 44px;
    padding: 0;
  }

  .site-header .tools .label {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .hero-grid {
    padding-block: 56px 64px;
  }

  .hero .actions .btn,
  .contact .actions .btn {
    flex: 1 1 100%;
  }

  .stats {
    padding-inline: 22px;
  }

  .areas,
  .example,
  .contact .card {
    padding: 24px;
  }

  .values {
    gap: 12px;
  }

  .values li {
    padding: 22px 18px 24px;
    font-size: 1.0625rem;
  }

  .section {
    padding-block: 64px;
  }

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

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

  * {
    transition: none !important;
  }
}

/* 404 */

.not-found {
  display: grid;
  align-items: center;
  min-height: 100vh;
}