:root {
  --ink: #163433;
  --ink-2: #234847;
  --text: #263b3a;
  --muted: #667572;
  --line: #dbe4df;
  --wash: #f3f7f4;
  --paper: #fffefa;
  --lime: #d7ff54;
  --green: #5e823b;
  --blue: #eaf4fb;
  --orange: #f6a55f;
  --radius: 18px;
  --shadow: 0 24px 60px rgba(20, 52, 50, .10);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 24px; }
body {
  margin: 0;
  color: var(--text);
  background: var(--paper);
  font: 16px/1.65 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  overflow-x: hidden;
}
a { color: inherit; }
a:hover { text-underline-offset: 5px; }
img { max-width: 100%; }
.shell { width: min(1180px, calc(100% - 64px)); margin-inline: auto; }
.skip-link {
  position: fixed;
  left: 20px;
  top: -80px;
  z-index: 50;
  padding: 12px 16px;
  color: var(--ink);
  background: var(--lime);
  border-radius: 6px;
  font-weight: 800;
}
.skip-link:focus { top: 16px; }
a:focus-visible, summary:focus-visible {
  outline: 3px solid #2b78c5;
  outline-offset: 4px;
}

.site-header {
  position: relative;
  z-index: 10;
  background: rgba(255, 254, 250, .96);
  border-bottom: 1px solid var(--line);
}
.nav-wrap {
  min-height: 86px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 34px;
}
.brand {
  display: inline-flex;
  align-items: center;
  color: var(--ink);
  font-size: 20px;
  font-weight: 850;
  letter-spacing: -.8px;
  text-decoration: none;
  white-space: nowrap;
}
.brand-mark {
  width: 34px;
  height: 38px;
  margin-right: 9px;
  display: inline-grid;
  place-items: center;
  color: var(--lime);
  background: var(--ink);
  border-radius: 9px;
  font-size: 28px;
  line-height: 1;
}
.brand-dot { color: var(--green); }
nav { display: flex; justify-content: center; gap: clamp(16px, 2.5vw, 32px); }
nav a {
  color: #3f5552;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}
nav a:hover, nav a[aria-current="page"] { color: var(--green); }
.nav-button {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 11px 17px;
  color: white;
  background: var(--ink);
  border-radius: 7px;
  font-size: 13px;
  font-weight: 800;
  text-decoration: none;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 76px 0 64px;
  background:
    radial-gradient(circle at 85% 15%, rgba(215,255,84,.18) 0 12%, transparent 12.3%),
    linear-gradient(180deg, #fffefa 0%, #f6f8f3 100%);
}
.hero::after {
  content: "";
  position: absolute;
  right: -170px;
  bottom: -230px;
  width: 520px;
  height: 520px;
  border: 1px solid rgba(22,52,51,.08);
  border-radius: 50%;
  box-shadow: 0 0 0 62px rgba(22,52,51,.025), 0 0 0 124px rgba(22,52,51,.018);
}
.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(350px, .82fr);
  gap: clamp(48px, 7vw, 92px);
  align-items: center;
}
.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  color: #4b7470;
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 1.7px;
  line-height: 1.4;
  text-transform: uppercase;
}
.eyebrow > span { width: 28px; height: 2px; background: var(--green); }
.eyebrow.light { color: #b8d1cd; }
.eyebrow.light > span { background: var(--lime); }
h1, h2, h3 { margin-top: 0; color: var(--ink); line-height: 1.1; letter-spacing: -1.7px; }
h1 { margin-bottom: 25px; font-size: clamp(52px, 6.2vw, 80px); font-weight: 700; letter-spacing: -4px; }
h1 em { color: var(--green); font-style: normal; }
.hero-intro { max-width: 700px; margin: 0; color: var(--muted); font-size: 19px; line-height: 1.75; }
.hero-actions { display: flex; align-items: center; gap: 25px; margin: 32px 0 38px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  min-height: 50px;
  padding: 13px 20px;
  border: 1px solid transparent;
  border-radius: 7px;
  font-size: 14px;
  font-weight: 850;
  text-decoration: none;
}
.button-primary { color: white; background: var(--ink); }
.button-primary:hover { background: var(--ink-2); }
.button-lime { color: var(--ink); background: var(--lime); }
.button-lime:hover { background: #c9f23d; }
.button-outline { color: white; border-color: rgba(255,255,255,.3); background: transparent; }
.button-outline:hover { border-color: white; }
.text-link { color: var(--ink); font-size: 14px; font-weight: 800; }
.hero-facts { display: flex; gap: 0; margin: 0; }
.hero-facts > div { min-width: 120px; padding-right: 30px; margin-right: 30px; border-right: 1px solid var(--line); }
.hero-facts > div:last-child { margin-right: 0; border-right: 0; }
.hero-facts dt { color: var(--ink); font-size: 21px; font-weight: 850; }
.hero-facts dd { margin: 0; color: var(--muted); font-size: 12px; }

.starter-card {
  position: relative;
  padding: 31px;
  color: white;
  background: var(--ink);
  border-radius: 20px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.starter-card::before {
  content: "";
  position: absolute;
  top: -95px;
  right: -95px;
  width: 230px;
  height: 230px;
  border: 46px solid rgba(215,255,84,.08);
  border-radius: 50%;
}
.starter-top { position: relative; display: flex; align-items: start; justify-content: space-between; gap: 20px; }
.read-time { color: #b8cbc7; font-size: 12px; }
.formula-visual { position: relative; margin: 18px 0 27px; padding: 27px 22px; background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.1); border-radius: 13px; }
.formula-label { display: block; margin-bottom: 10px; color: #a9c1bd; font-size: 10px; font-weight: 800; letter-spacing: 1.4px; text-transform: uppercase; }
.formula-visual > div { display: flex; align-items: center; gap: 14px; font-size: 18px; }
.formula-visual strong { color: var(--lime); font-size: 24px; }
.formula-visual i { display: block; width: 77%; height: 5px; margin-top: 18px; background: linear-gradient(90deg, var(--lime) 0 72%, rgba(255,255,255,.14) 72%); border-radius: 5px; }
.starter-card h2 { position: relative; margin-bottom: 16px; color: white; font-size: 29px; letter-spacing: -1.2px; }
.starter-card p { position: relative; margin: 0 0 22px; color: #c9d9d5; font-size: 14px; }
.starter-card > a { position: relative; color: var(--lime); font-size: 14px; font-weight: 850; }

.disclosure {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 28px;
  align-items: center;
  padding-top: 18px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
}
.disclosure strong { color: var(--ink); }
.disclosure p { margin: 0; color: var(--muted); }

.guide-section { padding-top: 92px; padding-bottom: 105px; }
.section-heading { display: grid; grid-template-columns: 1.15fr .85fr; gap: 70px; align-items: end; margin-bottom: 42px; }
.section-heading h2, .partner-heading h2, .method-intro h2 { margin: 0; font-size: clamp(37px, 4.2vw, 57px); }
.section-heading > p { max-width: 520px; margin: 0 0 4px; color: var(--muted); }
.topic-row { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 30px; }
.topic-row a { padding: 8px 13px; color: #4c6864; background: var(--wash); border: 1px solid var(--line); border-radius: 999px; font-size: 12px; font-weight: 750; text-decoration: none; }
.topic-row a:hover { color: var(--ink); border-color: #9ab09f; }
.guide-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.guide-card {
  position: relative;
  min-width: 0;
  min-height: 365px;
  display: flex;
  flex-direction: column;
  padding: 27px;
  background: white;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.guide-card:hover { transform: translateY(-4px); border-color: #adbea9; box-shadow: 0 18px 45px rgba(22,52,51,.08); }
.feature-card { grid-column: span 2; min-height: 390px; display: grid; grid-template-columns: minmax(240px, .85fr) minmax(0, 1.15fr); gap: 34px; align-items: stretch; padding: 0; overflow: hidden; }
.card-art { min-height: 100%; display: grid; place-items: center; position: relative; background: var(--blue); }
.art-runtime::before { content: ""; position: absolute; width: 235px; height: 235px; border: 1px solid rgba(22,52,51,.12); border-radius: 50%; box-shadow: 0 0 0 38px rgba(22,52,51,.035), 0 0 0 76px rgba(22,52,51,.02); }
.battery { position: absolute; left: 31px; top: 34px; width: 99px; height: 41px; display: flex; gap: 4px; padding: 6px; border: 3px solid var(--ink); border-radius: 7px; }
.battery::after { content: ""; position: absolute; right: -8px; top: 11px; width: 6px; height: 14px; background: var(--ink); border-radius: 0 3px 3px 0; }
.battery span { flex: 1; background: var(--green); border-radius: 2px; }
.runtime-ring { position: relative; z-index: 1; width: 158px; height: 158px; display: grid; place-content: center; text-align: center; background: var(--paper); border: 13px solid var(--lime); border-radius: 50%; box-shadow: var(--shadow); }
.runtime-ring b { color: var(--ink); font-size: 40px; line-height: 1; letter-spacing: -2px; }
.runtime-ring small { margin-top: 5px; color: var(--muted); font-size: 11px; }
.card-content { min-width: 0; display: flex; flex-direction: column; padding: 32px 32px 28px 0; }
.card-meta { display: flex; justify-content: space-between; gap: 15px; margin-bottom: 26px; color: var(--muted); font-size: 11px; font-weight: 750; letter-spacing: .8px; text-transform: uppercase; }
.card-meta span:first-child { color: var(--green); }
.guide-card h3 { margin-bottom: 16px; font-size: 25px; letter-spacing: -1px; }
.feature-card h3 { font-size: 31px; }
.guide-card p { margin: 0 0 23px; color: var(--muted); font-size: 14px; }
.guide-card > a, .card-content > a { margin-top: auto; color: var(--ink); font-size: 13px; font-weight: 850; }
.guide-card small, .card-content small { display: block; margin-top: 17px; color: #7c8986; font-size: 10px; line-height: 1.5; }
.card-number { margin-bottom: 30px; color: #9cad9f; font-size: 33px; font-weight: 300; letter-spacing: -2px; }
.dark-card { color: white; background: var(--ink); border-color: var(--ink); }
.dark-card h3 { color: white; }
.dark-card p { color: #c7d6d2; }
.dark-card .card-meta, .dark-card .card-number { color: #91aaa4; }
.dark-card .card-meta span:first-child, .dark-card > a { color: var(--lime); }
.caution-card { background: #fff9ea; }
.winter-card { background: #edf5f8; }

.partner-section { padding: 90px 0; color: white; background: var(--ink); }
.partner-heading { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; align-items: end; margin-bottom: 40px; }
.partner-heading h2 { color: white; }
.partner-heading > p { margin: 0; color: #b9ceca; }
.partner-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.partner-card { min-width: 0; display: flex; flex-direction: column; padding: 28px; background: rgba(255,255,255,.055); border: 1px solid rgba(255,255,255,.13); border-radius: 15px; }
.primary-partner { background: #274c49; }
.partner-label { margin-bottom: 34px; color: var(--lime); font-size: 11px; font-weight: 850; letter-spacing: 1.5px; }
.partner-card h3 { margin-bottom: 13px; color: white; font-size: 24px; }
.partner-card p { margin: 0 0 25px; color: #bed0cc; font-size: 14px; }
.partner-card .button { align-self: flex-start; margin-top: auto; }
.partner-card small { margin-top: 13px; color: #9fb6b1; font-size: 10px; }

.method-section { padding-top: 100px; padding-bottom: 100px; }
.method-intro { max-width: 760px; margin-bottom: 43px; }
.method-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--line); }
.method-grid article { padding: 31px 38px 0 0; }
.method-grid article + article { padding-left: 38px; border-left: 1px solid var(--line); }
.method-grid span { color: var(--green); font-size: 12px; font-weight: 850; }
.method-grid h3 { margin: 17px 0 12px; font-size: 22px; }
.method-grid p { margin: 0; color: var(--muted); font-size: 14px; }

.final-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 50px;
  align-items: center;
  margin-bottom: 100px;
  padding: 45px 48px;
  background: var(--wash);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.final-cta h2 { margin-bottom: 12px; font-size: clamp(30px, 3.2vw, 45px); }
.final-cta p:not(.eyebrow) { max-width: 760px; margin: 0; color: var(--muted); }

footer { color: #bdd0cc; background: #102827; }
.footer-top { display: flex; justify-content: space-between; align-items: center; gap: 30px; padding-top: 45px; padding-bottom: 35px; border-bottom: 1px solid rgba(255,255,255,.12); }
.footer-brand { color: white; }
.footer-links { display: flex; gap: 26px; flex-wrap: wrap; }
.footer-links a { font-size: 13px; text-decoration: none; }
.footer-bottom { display: grid; grid-template-columns: 1fr auto; gap: 50px; padding-top: 25px; padding-bottom: 35px; font-size: 11px; }
.footer-bottom p { margin: 0; }
.footer-bottom p:last-child { text-align: right; }

@media (max-width: 980px) {
  .nav-wrap { grid-template-columns: auto 1fr; }
  .nav-button { display: none; }
  nav { justify-content: flex-end; }
  .hero-grid { grid-template-columns: minmax(0, 1fr) minmax(320px, .8fr); gap: 40px; }
  .hero-facts > div { min-width: 100px; padding-right: 18px; margin-right: 18px; }
  .guide-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .partner-grid { grid-template-columns: 1fr 1fr; }
  .review-partner { grid-column: 1 / -1; }
}

@media (max-width: 760px) {
  .shell { width: min(100% - 36px, 1180px); }
  .nav-wrap { grid-template-columns: 1fr; gap: 15px; padding: 17px 0; }
  .brand { font-size: 19px; }
  nav { width: 100%; justify-content: space-between; gap: 10px; overflow-x: auto; }
  nav a { flex: 0 0 auto; font-size: 12px; }
  .hero { padding: 48px 0 42px; }
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 42px; }
  h1 { font-size: clamp(48px, 14vw, 67px); letter-spacing: -3px; }
  .hero-intro { font-size: 17px; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 16px; }
  .hero-facts { flex-wrap: wrap; row-gap: 15px; }
  .hero-facts > div { min-width: 28%; padding-right: 12px; margin-right: 12px; }
  .starter-card { padding: 25px; }
  .disclosure { grid-template-columns: 1fr; gap: 4px; }
  .guide-section { padding-top: 65px; padding-bottom: 70px; }
  .section-heading, .partner-heading { grid-template-columns: minmax(0, 1fr); gap: 20px; }
  .section-heading h2, .partner-heading h2, .method-intro h2 { font-size: 39px; }
  .guide-grid { grid-template-columns: minmax(0, 1fr); }
  .feature-card { grid-column: auto; grid-template-columns: minmax(0, 1fr); }
  .card-art { min-height: 285px; }
  .card-content { padding: 28px; }
  .partner-section { padding: 66px 0; }
  .partner-grid { grid-template-columns: minmax(0, 1fr); }
  .review-partner { grid-column: auto; }
  .method-section { padding-top: 70px; padding-bottom: 70px; }
  .method-grid { grid-template-columns: minmax(0, 1fr); }
  .method-grid article { padding: 26px 0; }
  .method-grid article + article { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
  .final-cta { grid-template-columns: minmax(0, 1fr); gap: 25px; margin-bottom: 70px; padding: 31px 27px; }
  .final-cta .button { justify-self: start; }
  .footer-top { align-items: flex-start; flex-direction: column; }
  .footer-links { gap: 18px; }
  .footer-bottom { grid-template-columns: minmax(0, 1fr); gap: 18px; }
  .footer-bottom p:last-child { text-align: left; }
}

@media (max-width: 420px) {
  .shell { width: min(100% - 28px, 1180px); }
  .brand-mark { width: 31px; height: 35px; }
  h1 { font-size: 47px; }
  .hero-facts > div { min-width: calc(33.333% - 12px); padding-right: 8px; margin-right: 8px; }
  .hero-facts dt { font-size: 18px; }
  .guide-card { min-height: 340px; padding: 23px; }
  .feature-card { padding: 0; }
  .feature-card h3 { font-size: 27px; }
  .card-content { padding: 24px; }
  .section-heading h2, .partner-heading h2, .method-intro h2 { font-size: 34px; }
  .partner-card { padding: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}