:root {
  --ink: #08212a;
  --ink-soft: #23414a;
  --paper: #f6f1e5;
  --paper-deep: #eae1cd;
  --white: #fffdf8;
  --mint: #16b890;
  --mint-dark: #087b66;
  --sun: #ffcf5a;
  --coral: #f27b62;
  --line: rgba(8, 33, 42, 0.14);
  --shadow: 0 22px 60px rgba(8, 33, 42, 0.12);
  --radius-sm: 14px;
  --radius-md: 22px;
  --radius-lg: 36px;
  --page: min(1180px, calc(100% - 36px));
  --sans: "Segoe UI", Tahoma, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: clip;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}

.formula {
  padding: 18px 20px;
  overflow-x: auto;
  border-inline-start: 5px solid var(--mint);
  border-radius: 8px;
  background: var(--white);
  color: var(--ink);
  font-family: Consolas, "Courier New", monospace;
  white-space: pre-wrap;
}

.notice {
  padding: 18px;
  border: 1px solid rgba(242, 123, 98, 0.35);
  border-radius: var(--radius-sm);
  background: rgba(242, 123, 98, 0.08);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 30px;
  color: var(--ink-soft);
  font-size: 0.85rem;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 8% 4%, rgba(255, 207, 90, 0.3), transparent 25rem),
    radial-gradient(circle at 90% 18%, rgba(22, 184, 144, 0.18), transparent 32rem);
  content: "";
  pointer-events: none;
}

button,
input,
select {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
}

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

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  letter-spacing: -0.035em;
  line-height: 1.08;
}

h1 {
  max-width: 900px;
  margin-bottom: 22px;
  font-size: clamp(3rem, 8vw, 6.6rem);
  font-weight: 760;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(2.1rem, 4.5vw, 4.3rem);
}

h3 {
  margin-bottom: 12px;
  font-size: 1.35rem;
}

[dir="rtl"] h1,
[dir="rtl"] h2,
[dir="rtl"] h3 {
  letter-spacing: 0;
}

.page-shell {
  width: var(--page);
  max-width: 100%;
  margin-inline: auto;
}

.section {
  padding-block: 92px;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(240px, 0.6fr);
  gap: 36px;
  align-items: end;
  margin-bottom: 42px;
}

.section-heading p {
  max-width: 520px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 1.08rem;
}

.eyebrow {
  margin-bottom: 10px;
  color: var(--mint-dark);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

[dir="rtl"] .eyebrow {
  letter-spacing: 0;
}

.skip-link {
  position: fixed;
  top: 10px;
  inset-inline-start: 10px;
  z-index: 999;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--ink);
  color: white;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: none;
}

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

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