:root {
  color-scheme: light;
  --ink: #162033;
  --muted: #526078;
  --paper: #ffffff;
  --soft: #eef5f3;
  --line: #c9d5d1;
  --brand: #075f55;
  --brand-dark: #04463f;
  --accent: #f4b942;
  --danger: #a12c2c;
  --focus: #0b68d1;
  --radius: 0.8rem;
  --shadow: 0 0.35rem 1.2rem rgb(22 32 51 / 10%);
  font: 18px/1.6 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  overflow-x: hidden;
}

body, button, input, select, textarea { font: inherit; }

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

a { color: var(--brand-dark); }

a:hover { text-decoration-thickness: 0.16rem; }

h1, h2, h3 {
  margin: 0 0 0.7rem;
  line-height: 1.2;
  overflow-wrap: anywhere;
}

h1 { font-size: clamp(2rem, 6vw, 3.5rem); }
h2 { font-size: clamp(1.6rem, 4vw, 2.3rem); }
h3 { font-size: 1.25rem; }
p { margin: 0 0 1rem; }

button, .button, input, select, textarea {
  min-height: 48px;
  border-radius: 0.55rem;
}

button, .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  max-width: 100%;
  padding: 0.65rem 1rem;
  border: 2px solid transparent;
  font-weight: 750;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
}

button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 4px solid var(--focus);
  outline-offset: 3px;
}

button.primary, .button.primary { color: white; background: var(--brand); }
button.primary:hover, .button.primary:hover { background: var(--brand-dark); }
button.secondary, .button.secondary { color: var(--brand-dark); background: white; border-color: var(--brand); }
button.warning { color: #2f2408; background: var(--accent); }
button.danger { color: white; background: var(--danger); }

button:disabled, button[aria-disabled="true"] {
  color: #59606a;
  background: #dfe3e6;
  border-color: #c4c9cd;
  cursor: not-allowed;
  opacity: 1;
}

input, select, textarea {
  width: 100%;
  padding: 0.65rem 0.75rem;
  color: var(--ink);
  background: white;
  border: 2px solid #82918d;
}

textarea { min-height: 8rem; resize: vertical; }
label { display: block; margin: 0.9rem 0 0.3rem; font-weight: 750; }

[hidden] { display: none !important; }

.shell { width: min(70rem, calc(100% - 2rem)); margin-inline: auto; }
.section { padding-block: clamp(2.5rem, 7vw, 5rem); }
.band { background: var(--soft); border-block: 1px solid var(--line); }

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.5rem;
  left: 0.5rem;
  padding: 0.7rem;
  color: white;
  background: var(--focus);
  transform: translateY(-160%);
}
.skip-link:focus-visible { transform: translateY(0); }

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  background: rgb(255 255 255 / 96%);
  border-bottom: 1px solid var(--line);
}
.header-row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 68px; }
.brand { font-size: 1.15rem; font-weight: 850; text-decoration: none; }
.site-header nav { display: flex; flex-wrap: wrap; gap: 0.4rem 1rem; }
.site-header nav a { min-height: 48px; display: inline-flex; align-items: center; }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(17rem, 0.7fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: center;
  padding-block: clamp(3rem, 9vw, 7rem);
}
.lead { max-width: 45rem; font-size: 1.15rem; color: var(--muted); }
.eyebrow { margin-bottom: 0.5rem; color: var(--brand); font-weight: 850; letter-spacing: 0.04em; text-transform: uppercase; }

.notice, .form-card, .study-panel, .price-card, .card {
  min-width: 0;
  padding: clamp(1rem, 3vw, 1.6rem);
  background: white;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow-wrap: anywhere;
}
.strong-notice { border-top: 0.45rem solid var(--accent); }
.notice p:last-child, .card p:last-child { margin-bottom: 0; }

.feature-grid, .pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}
.guide-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.guide-card { display: flex; min-height: 8rem; flex-direction: column; justify-content: center; padding: 1.2rem; color: var(--ink); background: white; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); text-decoration: none; }
.guide-card:hover { border-color: var(--brand); }
.guide-card strong { margin-bottom: 0.35rem; color: var(--brand-dark); font-size: 1.15rem; }
.guide-card span { color: var(--muted); }
.feature-grid .card { display: flex; flex-direction: column; }
.feature-grid strong { color: var(--brand); font-size: 2rem; }

.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; }
.action-row { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-top: 1rem; }
.study-panel, .form-card { margin-top: 1.5rem; }
.study-panel { max-width: 52rem; }
.progress-label { color: var(--muted); font-weight: 750; }
.tag { display: inline-block; padding: 0.25rem 0.65rem; border-radius: 999px; color: var(--brand-dark); background: #d9eee9; font-weight: 750; }
.answer-box { margin-block: 1rem; padding: 1rem; background: #fff9e8; border-left: 0.35rem solid var(--accent); }
.answer-box p:last-child { margin-bottom: 0; }
.source-details { margin-top: 0.8rem; padding-top: 0.8rem; border-top: 1px solid var(--line); }
.source-details p { margin: 0.35rem 0 0; color: var(--muted); }
.explanation { margin-top: 0.8rem; padding: 1rem; background: #f4f7fb; border: 1px solid #cad5e1; border-radius: 0.55rem; }
.helper, .status { color: var(--muted); }
.result-card { border-top: 0.45rem solid var(--brand); }

.price-card { display: flex; flex-direction: column; }
.price-card .price { margin: 0; color: var(--brand); font-size: 2rem; font-weight: 850; }
.price-card button { margin-top: auto; }

.premium-section { margin-top: 2rem; }
.premium-card-list { display: grid; gap: 0.8rem; }
.premium-question-card { background: white; border: 1px solid var(--line); border-radius: 0.6rem; }
.premium-question-card summary { min-height: 48px; padding: 0.8rem; font-weight: 800; cursor: pointer; }
.premium-question-card summary:focus-visible { outline: 4px solid var(--focus); outline-offset: 3px; }
.premium-card-body { padding: 0 0.9rem 0.9rem; }
.premium-card-body h4 { margin-bottom: 0.35rem; }
.premium-answer { padding: 0.8rem; background: #fff9e8; border-left: 0.35rem solid var(--accent); }
.premium-list { display: grid; gap: 0.7rem; padding-left: 1.25rem; }
.premium-question { padding: 0.7rem; background: var(--soft); border-radius: 0.5rem; }
.writing-answer { margin-top: 0.8rem; padding: 0.8rem; background: #fff9e8; border-left: 0.35rem solid var(--accent); }
.review-browser { margin-top: 1.5rem; }
.review-list { display: grid; gap: 0.7rem; padding-left: 1.3rem; }
.review-item { padding: 0.8rem; background: var(--soft); border-radius: 0.55rem; }
.review-item span { display: block; margin-bottom: 0.6rem; }

footer { padding-block: 2.5rem; color: white; background: var(--ink); }
footer a { color: white; }
.footer-grid { display: grid; grid-template-columns: 1fr auto 1fr; gap: 2rem; }
.footer-grid nav { display: grid; gap: 0.5rem; }

.legal-main { padding-block: 3rem 5rem; }
.legal-main article { max-width: 52rem; }
.guide-article > section { margin-top: 2rem; }
.source-callout { padding: 1rem 1.2rem; background: var(--soft); border-left: 0.35rem solid var(--brand); border-radius: 0.4rem; }
.legal-main li { margin-bottom: 0.7rem; }
.back-link { display: inline-flex; min-height: 48px; align-items: center; }

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

@media (max-width: 760px) {
  .shell { width: min(100% - 1rem, 42rem); }
  .site-header { position: static; }
  .header-row, .section-heading { align-items: stretch; flex-direction: column; }
  .site-header nav { gap: 0.2rem 0.8rem; }
  .hero, .feature-grid, .pricing-grid, .footer-grid, .guide-grid { grid-template-columns: 1fr; }
  .hero { padding-block: 2.5rem; }
  .action-row > * { flex: 1 1 12rem; }
}

@media (max-width: 400px) {
  :root { font-size: 18px; }
  .shell { width: min(100% - 0.75rem, 30rem); }
  .notice, .form-card, .study-panel, .price-card, .card { padding: 0.9rem; }
  .site-header nav a { font-size: 0.95rem; }
}