:root {
  color-scheme: light;
  --paper: #f8f7f2;
  --ink: #182b25;
  --muted: #51625a;
  --line: #d7ddd3;
  --forest: #254f40;
  --sage: #e6edde;
  --white: #ffffff;
  --focus: #5d46b6;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  font-synthesis: none;
  font-size: 16px;
}
* { box-sizing: border-box; }
html { scroll-padding-top: 110px; }
body { margin: 0; background: var(--paper); color: var(--ink); line-height: 1.65; }
body, h1, h2, h3, p, a, li { overflow-wrap: break-word; }
::selection { background: #d7e4ad; color: var(--ink); }
a { color: inherit; text-underline-offset: .2em; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--focus); outline-offset: 5px; }
svg { display: block; max-width: 100%; }
h1, h2, h3, p, figure { margin: 0; }
h1, h2, h3 { line-height: 1.15; font-weight: 600; }
h1 { font-size: clamp(2.65rem, 4.8vw, 4.5rem); letter-spacing: -.055em; }
h1 span { color: var(--forest); }
h2 { font-size: clamp(2rem, 3.2vw, 3rem); letter-spacing: -.045em; }
h3 { font-size: 1.25rem; letter-spacing: -.02em; }
.shell { max-width: 1200px; margin-inline: auto; padding-inline: 40px; }
.skip-link { position: fixed; top: -100px; left: 20px; padding: 12px 20px; z-index: 20; background: var(--ink); color: var(--white); }
.skip-link:focus { top: 12px; }
.site-header { position: sticky; top: 0; z-index: 10; background: var(--paper); border-bottom: 1px solid var(--line); }
.header-inner { max-width: 1360px; margin-inline: auto; min-height: 84px; padding: 18px 40px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; gap: 10px; align-items: center; text-decoration: none; white-space: nowrap; font-size: 1.12rem; font-weight: 650; letter-spacing: -.04em; }
.brand-mark { width: 36px; height: 36px; flex-shrink: 0; color: var(--forest); }
.section-nav { display: flex; align-items: center; gap: 26px; font-size: .875rem; font-weight: 500; }
.section-nav a { text-decoration: none; }
.section-nav a:hover { text-decoration: underline; }
.languages { display: flex; gap: 3px; flex-shrink: 0; }
.languages a { display: inline-flex; align-items: center; justify-content: center; min-width: 34px; min-height: 36px; padding: 5px 7px; font-size: .75rem; font-weight: 600; border-radius: 7px; text-decoration: none; }
.languages a[aria-current="page"] { color: var(--white); background: var(--ink); }
.languages a:hover:not([aria-current="page"]) { background: var(--sage); }
.hero { display: grid; grid-template-columns: minmax(0, 1.28fr) minmax(0, 1fr); gap: 62px; align-items: center; padding-top: 86px; padding-bottom: 100px; }
.hero-copy { min-width: 0; }
.eyebrow { font-size: .75rem; line-height: 1.5; font-weight: 600; letter-spacing: .09em; text-transform: uppercase; color: var(--forest); margin-bottom: 24px; }
.hero .eyebrow { max-width: 420px; margin-bottom: 23px; }
.product-name { margin-top: 22px; color: var(--forest); font-size: .875rem; font-weight: 600; line-height: 1.5; }
.hero-lead { margin-top: 20px; max-width: 570px; font-size: 1.0625rem; line-height: 1.7; color: var(--muted); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 22px; align-items: center; margin-top: 32px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 18px; padding: 16px 20px; border-radius: 8px; text-decoration: none; font-size: .875rem; font-weight: 600; line-height: 1.5; }
.button.primary { color: var(--white); background: var(--forest); }
.button.primary:hover { background: #173b2e; }
.button.cream { color: var(--ink); background: #f0f2dc; }
.button.cream:hover { background: #ffffff; }
.arrow { width: 20px; height: 20px; flex-shrink: 0; }
.text-link { display: inline-flex; align-items: center; gap: 10px; font-size: .875rem; line-height: 1.5; font-weight: 600; }
.micro { color: var(--muted); font-size: .75rem; line-height: 1.65; }
.hero-copy > .micro { margin-top: 24px; max-width: 445px; }
.history-figure { background: var(--sage); padding: 30px; border: 1px solid #d6dfcd; border-radius: 22px; }
.figure-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 24px; }
.pill { display: inline-block; font-size: .6875rem; line-height: 1.5; font-weight: 600; letter-spacing: .035em; border: 1px solid #b5c5ad; padding: 6px 10px; border-radius: 30px; }
.signal-dot { width: 9px; height: 9px; border-radius: 50%; border: 2px solid var(--forest); }
.history-figure h2 { font-size: 1.45rem; letter-spacing: -.035em; max-width: 330px; }
.history-orbit { width: 100%; height: auto; margin: 14px 0 19px; }
.flow-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.flow-list li { display: grid; grid-template-columns: 31px minmax(0, 1fr); align-items: start; gap: 12px; padding-bottom: 14px; border-bottom: 1px solid #cbd6c4; }
.flow-number { font-size: .6875rem; font-weight: 650; padding-top: 4px; letter-spacing: .05em; color: #45604a; }
.flow-list strong { font-size: .875rem; font-weight: 600; }
.flow-list p { font-size: .8125rem; line-height: 1.55; color: var(--muted); margin-top: 3px; }
.history-figure figcaption { margin-top: 18px; color: #455849; font-size: .6875rem; line-height: 1.65; }
.section { padding-top: 74px; padding-bottom: 74px; }
.section-intro { max-width: 690px; }
.section-intro .eyebrow { margin-bottom: 16px; }
.intro { margin-top: 22px; color: var(--muted); font-size: 1rem; line-height: 1.75; }
#after-alert { border-top: 1px solid var(--line); }
.steps { margin-top: 40px; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 34px; }
.step { border-top: 1px solid var(--line); padding-top: 18px; }
.step-number { color: var(--forest); font-size: .6875rem; font-weight: 650; }
.step h3 { margin-top: 22px; }
.step p { margin-top: 14px; font-size: .875rem; color: var(--muted); }
.section-link { margin-top: 35px; }
.mechanics-wrap { background: #eeeee7; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.mechanics { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 85px; align-items: start; }
.mechanics .intro { max-width: 510px; }
.topics { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; margin: 26px 0 0; padding: 0; }
.topics li { border: 1px solid #c9cfc1; border-radius: 30px; padding: 5px 12px; font-size: .75rem; }
.questions { padding-top: 11px; }
.questions article { display: grid; grid-template-columns: 31px minmax(0, 1fr); gap: 15px; padding: 0 0 20px; margin-bottom: 22px; border-bottom: 1px solid #d3d7cc; }
.question-icon { color: var(--forest); font-size: 1.5rem; line-height: 1; }
.questions h3 { font-size: 1.125rem; }
.questions p { margin-top: 9px; color: var(--muted); font-size: .875rem; }
.questions .mechanics-note { font-size: .75rem; line-height: 1.65; }
.course-panel { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 62px; padding: 48px; background: var(--forest); color: #f7f8ef; border-radius: 17px; }
.course-panel .pill { color: #f3f8cf; border-color: #688375; margin-bottom: 23px; }
.course-panel h2 { font-size: clamp(1.85rem, 2.8vw, 2.65rem); }
.course-copy { padding-top: 5px; }
.course-copy > p { font-size: .9375rem; color: #e0e9df; }
.course-copy .button { margin-top: 25px; }
.course-copy > .course-note { margin-top: 19px; font-size: .75rem; color: #d6e3d3; line-height: 1.6; }
.sample { padding-top: 16px; }
.sample-grid { display: grid; grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr); gap: 62px; align-items: start; margin-top: 36px; }
.packet { padding: 29px; border: 1px solid var(--line); background: #fffef9; border-radius: 12px; }
.packet .eyebrow { margin-bottom: 24px; }
.packet-symbol { display: block; width: 50px; height: 50px; border-radius: 50%; text-align: center; font-size: 2rem; color: var(--forest); background: var(--sage); line-height: 47px; }
.packet-time { margin: 26px 0 13px; font-size: .75rem; color: var(--forest); font-weight: 600; }
.packet > p:last-of-type { font-size: .9375rem; }
.packet-lines { display: flex; flex-direction: column; gap: 9px; margin-top: 28px; }
.packet-lines i { display: block; width: 100%; height: 4px; background: #e3e9db; border-radius: 5px; }
.packet-lines i:nth-child(2) { width: 78%; }
.packet-lines i:nth-child(3) { width: 48%; }
.exercise ol { margin: 0; padding-left: 24px; }
.exercise li { padding-left: 10px; margin-bottom: 19px; font-size: 1rem; }
.exercise li::marker { color: var(--forest); font-weight: 600; }
.exercise > .micro { margin-top: 6px; }
.guide { margin-top: 25px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.guide summary { display: flex; align-items: center; justify-content: space-between; gap: 15px; padding: 20px 2px; font-weight: 600; font-size: .875rem; cursor: pointer; list-style: none; }
.guide summary::-webkit-details-marker { display: none; }
.guide summary span { font-size: 1.5rem; color: var(--forest); }
.guide[open] summary span { transform: rotate(45deg); }
.guide-content { padding: 0 2px 22px; }
.guide-content > div { margin-bottom: 15px; }
.guide-content h3 { font-size: .8125rem; color: var(--forest); margin-bottom: 6px; }
.guide-content p { font-size: .875rem; color: var(--muted); }
.guide-content > .micro { margin-top: 20px; font-size: .75rem; }
.limits { border-top: 1px solid var(--line); }
.limits h2 { font-size: clamp(1.6rem, 2.7vw, 2.25rem); }
.limits-grid { margin-top: 32px; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 34px; }
.limits h3 { font-size: 1rem; line-height: 1.3; }
.limits p { margin-top: 12px; font-size: .8125rem; line-height: 1.75; color: var(--muted); }
.site-footer { background: #e8ecdf; border-top: 1px solid var(--line); padding: 36px 0 26px; }
.footer-top { display: flex; align-items: center; justify-content: space-between; gap: 26px; padding-bottom: 29px; border-bottom: 1px solid #cbd3c2; }
.footer-top p { margin-top: 10px; font-size: .875rem; color: var(--muted); }
.footer-bottom { display: flex; align-items: start; justify-content: space-between; gap: 25px; padding-top: 22px; }
.footer-bottom nav { display: flex; flex-wrap: wrap; gap: 12px 22px; font-size: .75rem; }
.footer-bottom > p { max-width: 390px; font-size: .6875rem; color: var(--muted); }
@media (min-width: 1440px) { .hero { padding-top: 104px; padding-bottom: 116px; } }
@media (max-width: 1000px) {
  .header-inner, .shell { padding-inline: 28px; }
  .section-nav { gap: 15px; font-size: .8125rem; }
  .hero { gap: 30px; padding-top: 64px; padding-bottom: 74px; }
  .history-figure { padding: 24px; }
  .hero-actions { gap: 20px; }
  .mechanics, .sample-grid { gap: 35px; }
  .course-panel { gap: 35px; padding: 35px; }
  .steps, .limits-grid { gap: 25px; }
}
@media (max-width: 760px) {
  html { scroll-padding-top: 100px; }
  .section-nav { display: none; }
  .header-inner { min-height: 76px; padding-block: 16px; gap: 15px; }
  .hero { grid-template-columns: minmax(0, 1fr); gap: 42px; padding-top: 53px; padding-bottom: 57px; }
  h1 { font-size: clamp(2.7rem, 7.7vw, 4rem); }
  .hero-lead { max-width: 600px; }
  .history-figure { max-width: 540px; width: 100%; }
  .history-orbit { max-height: 150px; }
  .section { padding-top: 52px; padding-bottom: 52px; }
  .mechanics, .course-panel, .sample-grid { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .course-panel { padding: 32px; }
  .course-copy { padding-top: 0; }
  .sample { padding-top: 5px; }
  .packet { max-width: 540px; }
  .steps { gap: 24px; }
  .steps, .limits-grid { grid-template-columns: minmax(0, 1fr); }
  .step h3 { margin-top: 13px; }
  .step p { max-width: 580px; }
  .limits-grid { gap: 26px; }
  .footer-bottom { display: block; }
  .footer-bottom > p { margin-top: 20px; max-width: 600px; }
}
@media (max-width: 420px) {
  .shell, .header-inner { padding-inline: 20px; }
  .brand { font-size: 1rem; gap: 7px; }
  .brand-mark { width: 29px; height: 29px; }
  .languages a { min-width: 29px; padding-inline: 5px; font-size: .6875rem; }
  h1 { font-size: 2.5rem; letter-spacing: -.045em; }
  .hero-actions { align-items: flex-start; flex-direction: column; }
  .button { max-width: 100%; text-align: left; padding: 15px 17px; }
  .history-figure, .packet { padding: 23px; }
  .course-panel { padding: 25px; }
  .footer-top { flex-wrap: wrap; }
}
@media print {
  .site-header { position: static; }
  .section-nav, .languages, .skip-link { display: none; }
  .section, .hero { padding-top: 28px; padding-bottom: 28px; }
  .course-panel { color: #182b25; background: #eeeeee; }
  .course-copy > p, .course-copy > .course-note { color: #182b25; }
  details:not([open]) .guide-content { display: block; }
}