:root {
  --bg: #faf8ff;
  --bg-alt: #f2f4ff;
  --surface: #ffffff;
  --surface-soft: #eef2ff;
  --line: #d8dfef;
  --text: #171b28;
  --muted: #5d6678;
  --muted-strong: #40495c;
  --primary: #2f8dfc;
  --primary-strong: #126dd8;
  --primary-soft: rgba(47, 141, 252, 0.12);
  --secondary: #94ea63;
  --hero-start: #203245;
  --hero-end: #34445a;
  --footer: #1f2533;
  --shadow-soft: 0 18px 38px rgba(18, 24, 37, 0.08);
  --shadow-float: 0 22px 44px rgba(18, 24, 37, 0.12);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --container: min(1180px, calc(100vw - 40px));
  --heading-font: "Hanken Grotesk", "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif;
  --body-font: "Inter", "SF Pro Text", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--body-font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.68;
}

a {
  color: inherit;
  text-decoration: none;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(246, 248, 253, 0.92);
  border-bottom: 1px solid rgba(216, 223, 239, 0.62);
  backdrop-filter: blur(12px);
}

.header-inner,
.section-inner,
.footer-inner {
  width: var(--container);
  margin: 0 auto;
}

.header-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--heading-font);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  box-shadow: 0 8px 20px rgba(24, 27, 39, 0.08);
}

.nav {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-left: auto;
}

.nav a {
  color: var(--muted-strong);
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav a[aria-current="page"] {
  color: var(--primary-strong);
}

.header-cta,
.primary-button,
.secondary-button,
.related-card {
  transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

.header-cta,
.primary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: 14px;
  background: linear-gradient(180deg, var(--primary), var(--primary-strong));
  color: #ffffff;
  font-size: 0.92rem;
  font-weight: 700;
  box-shadow: 0 12px 24px rgba(47, 141, 252, 0.22);
}

.secondary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.08);
  color: #ffffff;
  font-size: 0.92rem;
  font-weight: 700;
}

.header-cta:hover,
.primary-button:hover,
.secondary-button:hover,
.related-card:hover {
  transform: translateY(-2px);
  filter: brightness(1.03);
}

.page-hero {
  position: relative;
  overflow: hidden;
  padding: 0;
  background:
    linear-gradient(90deg, rgba(11, 15, 20, 0.66) 0%, rgba(11, 15, 20, 0.5) 34%, rgba(11, 15, 20, 0.2) 62%, rgba(11, 15, 20, 0.06) 100%),
    radial-gradient(circle at left top, rgba(148, 234, 99, 0.16), transparent 28%),
    url("/assets/hero_bg.png") center center / cover no-repeat;
  color: #ffffff;
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(11, 15, 20, 0.08), rgba(11, 15, 20, 0.24)),
    radial-gradient(circle at 78% 22%, rgba(47, 141, 252, 0.12), transparent 22%);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  z-index: 1;
  width: var(--container);
  min-height: 420px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 84px 0 72px;
}

.hero-copy {
  width: min(1180px, 100%);
  text-align: center;
}

.hero-title {
  max-width: 14ch;
  margin: 0 auto;
  font-family: var(--heading-font);
  font-size: clamp(3rem, 5vw, 5.4rem);
  line-height: 1.02;
  letter-spacing: -0.045em;
  text-wrap: balance;
  text-shadow: 0 8px 28px rgba(11, 15, 20, 0.22);
}

.hero-lead {
  max-width: 56ch;
  margin: 22px auto 0;
  color: rgba(245, 248, 255, 0.86);
  font-size: 1.02rem;
  line-height: 1.72;
  text-shadow: 0 4px 20px rgba(11, 15, 20, 0.18);
}

.section {
  padding: 68px 0;
}

.section-alt {
  background: linear-gradient(180deg, rgba(242, 244, 255, 0.88), rgba(250, 248, 255, 0.94));
}

.section-heading {
  max-width: 780px;
  margin: 0 auto 32px;
  text-align: center;
}

.section-heading h2 {
  font-family: var(--heading-font);
  font-size: clamp(2rem, 3.8vw, 3.1rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
  text-wrap: balance;
}

.section-heading p {
  max-width: 62ch;
  margin: 14px auto 0;
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.72;
}

.content-grid,
.step-grid,
.related-grid {
  display: grid;
  gap: 20px;
}

.content-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.step-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.related-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.info-card,
.step-card,
.faq-card,
.related-card {
  padding: 24px;
  position: relative;
  overflow: hidden;
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), #ffffff);
  border: 1px solid rgba(216, 223, 239, 0.82);
  box-shadow: var(--shadow-soft);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.info-card:hover,
.step-card:hover,
.faq-card:hover,
.related-card:hover {
  transform: translateY(-4px);
  border-color: rgba(47, 141, 252, 0.24);
  box-shadow: var(--shadow-float);
}

.info-card h3,
.step-card h3,
.related-card h3,
.faq-question {
  font-family: var(--heading-font);
  font-size: 1.16rem;
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

.info-card p,
.step-card p,
.faq-answer,
.related-card p {
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.check-list {
  display: grid;
  gap: 12px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 24px;
  color: var(--muted-strong);
  line-height: 1.66;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--primary-soft);
  color: var(--primary-strong);
  font-weight: 800;
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.related-card {
  display: grid;
  gap: 10px;
}

.related-card span {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 30px;
  padding: 0 12px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-strong);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.cta-panel {
  padding: 42px 34px;
  border-radius: 32px;
  background:
    linear-gradient(135deg, rgba(35, 56, 72, 0.96), rgba(62, 74, 64, 0.94)),
    url("/assets/hero_bg.png") center center / cover no-repeat;
  color: #ffffff;
  box-shadow: 0 24px 44px rgba(24, 27, 39, 0.18);
  text-align: center;
}

.cta-panel h2 {
  max-width: 17ch;
  margin: 0 auto;
  font-family: var(--heading-font);
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.04;
  letter-spacing: -0.04em;
  text-wrap: balance;
}

.cta-panel p {
  max-width: 60ch;
  margin: 14px auto 0;
  color: rgba(242, 244, 255, 0.8);
  line-height: 1.72;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-top: 24px;
}

.footer {
  padding: 30px 0 40px;
  background: var(--footer);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  color: rgba(241, 244, 255, 0.68);
  font-size: 0.84rem;
}

.footer-brand {
  color: #ffffff;
  font-family: var(--heading-font);
  font-weight: 800;
}

@media (max-width: 1040px) {
  .content-grid,
  .related-grid,
  .faq-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 840px) {
  .header-inner {
    flex-wrap: wrap;
    gap: 12px;
    padding: 14px 0;
  }

  .nav {
    order: 3;
    width: 100%;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 4px;
  }

  .cta-actions {
    flex-direction: column;
  }

  .primary-button,
  .secondary-button {
    width: 100%;
  }
}

@media (max-width: 640px) {
  :root {
    --container: min(100vw - 24px, 1180px);
  }

  .page-hero {
    padding: 0;
  }

  .hero-grid {
    min-height: 300px;
    padding: 64px 0 48px;
  }

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

  .section {
    padding: 56px 0;
  }

  .cta-panel,
  .info-card,
  .step-card,
  .faq-card,
  .related-card {
    padding: 20px;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}