:root {
  color-scheme: light;
  --canvas: #f4f5fa;
  --surface: rgba(255, 255, 255, 0.84);
  --surface-solid: #ffffff;
  --ink: #141b2b;
  --muted: #687084;
  --line: #e4e7ef;
  --navy: #152d57;
  --blue: #3159df;
  --blue-soft: #e7ecff;
  --teal: #119d94;
  --shadow: 0 24px 70px rgba(20, 35, 71, 0.12);
  --radius-lg: 28px;
  --radius-md: 18px;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  background:
    radial-gradient(circle at 85% 0%, rgba(49, 89, 223, 0.11), transparent 32rem),
    var(--canvas);
  color: var(--ink);
  line-height: 1.6;
}

a {
  color: var(--blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(228, 231, 239, 0.82);
  background: rgba(244, 245, 250, 0.84);
  backdrop-filter: blur(18px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1120px, calc(100% - 40px));
  min-height: 76px;
  margin: 0 auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 0.86rem;
  font-weight: 800;
  letter-spacing: 0.13em;
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 11px;
  background: var(--blue-soft);
  color: var(--blue);
}

.brand-mark svg {
  width: 20px;
  height: 20px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 0.92rem;
  font-weight: 650;
}

.nav-links a {
  color: var(--muted);
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--ink);
  text-decoration: none;
}

.container {
  width: min(960px, calc(100% - 40px));
  margin: 0 auto;
}

.hero {
  padding: 94px 0 68px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(260px, 0.85fr);
  gap: 62px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--blue);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.12;
  letter-spacing: -0.035em;
}

h1 {
  max-width: 680px;
  font-size: clamp(2.65rem, 6vw, 5rem);
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(1.65rem, 3vw, 2.3rem);
}

h3 {
  margin-bottom: 8px;
  font-size: 1.08rem;
  letter-spacing: -0.015em;
}

.lede {
  max-width: 610px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 1.15rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: var(--blue);
  color: #fff;
  font-weight: 750;
  box-shadow: 0 12px 24px rgba(49, 89, 223, 0.22);
}

.button:hover {
  background: #254ac9;
  color: #fff;
  text-decoration: none;
}

.button.secondary {
  border-color: var(--line);
  background: var(--surface-solid);
  color: var(--ink);
  box-shadow: none;
}

.button.secondary:hover {
  border-color: #cbd2e2;
  background: #f9faff;
  color: var(--ink);
}

.hero-card {
  position: relative;
  min-height: 330px;
  overflow: hidden;
  padding: 28px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--navy), var(--blue));
  color: white;
  box-shadow: var(--shadow);
}

.hero-card::after {
  position: absolute;
  right: -55px;
  bottom: -65px;
  width: 250px;
  height: 250px;
  border: 24px solid rgba(255, 255, 255, 0.08);
  border-radius: 50%;
  content: "";
}

.hero-card-label {
  color: rgba(255, 255, 255, 0.68);
  font-size: 0.73rem;
  font-weight: 800;
  letter-spacing: 0.15em;
}

.pair {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 44px;
  font-size: 1.15rem;
  font-weight: 750;
}

.badge {
  padding: 7px 11px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.14);
}

.rate {
  margin-top: 28px;
  font-size: clamp(2.7rem, 6vw, 4.3rem);
  font-weight: 800;
  letter-spacing: -0.06em;
  line-height: 1;
}

.rate small {
  color: rgba(255, 255, 255, 0.72);
  font-size: 1rem;
  letter-spacing: 0;
}

.updated {
  margin-top: 18px;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
}

.section {
  padding: 38px 0 88px;
}

.section-intro {
  max-width: 660px;
  margin-bottom: 30px;
  color: var(--muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.card {
  padding: 24px;
  border: 1px solid rgba(228, 231, 239, 0.96);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: 0 12px 32px rgba(20, 35, 71, 0.05);
}

.card p,
.card li {
  color: var(--muted);
  font-size: 0.95rem;
}

.icon {
  display: grid;
  width: 42px;
  height: 42px;
  margin-bottom: 18px;
  place-items: center;
  border-radius: 13px;
  background: var(--blue-soft);
  color: var(--blue);
}

.icon svg {
  width: 21px;
  height: 21px;
}

.page-heading {
  padding: 78px 0 36px;
}

.page-heading h1 {
  font-size: clamp(2.4rem, 5vw, 4.2rem);
}

.page-heading p {
  max-width: 650px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 30px;
  align-items: start;
  padding-bottom: 90px;
}

.article {
  padding: clamp(24px, 5vw, 48px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface-solid);
  box-shadow: 0 16px 45px rgba(20, 35, 71, 0.06);
}

.article h2 {
  margin-top: 38px;
  font-size: 1.55rem;
}

.article h2:first-child {
  margin-top: 0;
}

.article h3 {
  margin-top: 25px;
}

.article p,
.article li {
  color: #4f596e;
}

.article ul {
  padding-left: 21px;
}

.article li + li {
  margin-top: 8px;
}

.article strong {
  color: var(--ink);
}

.toc {
  position: sticky;
  top: 102px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.62);
}

.toc-title {
  margin-bottom: 10px;
  color: var(--ink);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.toc a {
  display: block;
  padding: 6px 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.support-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.8fr);
  gap: 24px;
  padding-bottom: 90px;
}

.faq-list {
  display: grid;
  gap: 12px;
}

details {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface-solid);
}

summary {
  cursor: pointer;
  color: var(--ink);
  font-weight: 750;
}

details p {
  margin: 13px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.form-card {
  padding: 26px;
  border-radius: var(--radius-lg);
  background: var(--surface-solid);
  box-shadow: var(--shadow);
}

.form-card p {
  color: var(--muted);
}

label {
  display: block;
  margin: 17px 0 7px;
  color: var(--ink);
  font-size: 0.88rem;
  font-weight: 700;
}

input,
textarea,
select {
  width: 100%;
  padding: 13px 14px;
  border: 1px solid #d8dce6;
  border-radius: 12px;
  background: #fbfcff;
  color: var(--ink);
  font: inherit;
}

textarea {
  min-height: 140px;
  resize: vertical;
}

input:focus,
textarea:focus,
select:focus {
  outline: 3px solid rgba(49, 89, 223, 0.16);
  border-color: var(--blue);
}

.form-card .button {
  width: 100%;
  margin-top: 22px;
  border: 0;
  cursor: pointer;
  font: inherit;
}

.form-note {
  margin-top: 14px;
  font-size: 0.78rem;
}

.notice {
  margin: 24px 0;
  padding: 16px 18px;
  border-left: 4px solid var(--teal);
  border-radius: 12px;
  background: #edf9f7;
  color: #3f625e;
}

.footer {
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.44);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  width: min(960px, calc(100% - 40px));
  min-height: 92px;
  margin: 0 auto;
  color: var(--muted);
  font-size: 0.86rem;
}

.footer-links {
  display: flex;
  gap: 18px;
}

@media (max-width: 780px) {
  .nav {
    min-height: 68px;
  }

  .nav-links {
    gap: 14px;
    font-size: 0.82rem;
  }

  .hero {
    padding-top: 62px;
  }

  .hero-grid,
  .support-grid,
  .content-layout {
    grid-template-columns: 1fr;
  }

  .hero-card {
    min-height: 290px;
  }

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

  .toc {
    position: static;
    order: -1;
  }
}

@media (max-width: 480px) {
  .nav,
  .container,
  .footer-inner {
    width: min(100% - 28px, 960px);
  }

  .brand {
    font-size: 0.75rem;
    letter-spacing: 0.08em;
  }

  .brand-mark {
    width: 30px;
    height: 30px;
  }

  .nav-links {
    gap: 10px;
  }

  .hero {
    padding-bottom: 40px;
  }

  .button-row {
    align-items: stretch;
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .article {
    padding: 24px 20px;
  }
}