:root {
  --bg: #f4f7f9;
  --surface: #ffffff;
  --text: #0d1721;
  --muted: #5f7282;
  --line: #dfe6ec;
  --teal: #23cfc2;
  --teal-deep: #17b5aa;
  --teal-soft: #dff8f5;
  --yellow: #ffd33d;
  --dark: #07111c;
  --shadow: 0 24px 60px rgba(8, 24, 38, 0.08);
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 14px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
}

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

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.container {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.narrow {
  width: min(900px, calc(100% - 40px));
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(223, 230, 236, 0.7);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 84px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.brand-mark {
  width: 26px;
  height: 26px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--teal), #59e5d9);
  position: relative;
  box-shadow: 0 8px 20px rgba(35, 207, 194, 0.35);
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 6px 8px 6px 9px;
  border-radius: 9px 9px 9px 3px;
  background: #fff;
  transform: rotate(15deg);
}

.brand-text {
  font-size: 1.2rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  color: var(--muted);
  font-size: 0.96rem;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--text);
}

.header-cta,
.primary-btn,
.ghost-btn,
.card-btn,
.dark-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  font-weight: 700;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.header-cta,
.primary-btn {
  background: var(--yellow);
  color: var(--dark);
  box-shadow: 0 16px 30px rgba(255, 211, 61, 0.28);
}

.header-cta {
  padding: 14px 20px;
  font-size: 0.96rem;
}

.primary-btn {
  padding: 18px 28px;
}

.ghost-btn {
  padding: 18px 28px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
}

.dark-btn {
  padding: 18px 28px;
  background: #07111c;
  color: #fff;
  box-shadow: 0 20px 34px rgba(7, 17, 28, 0.2);
}

.header-cta:hover,
.primary-btn:hover,
.ghost-btn:hover,
.card-btn:hover,
.dark-btn:hover {
  transform: translateY(-2px);
}

.hero {
  padding: 54px 0 44px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(340px, 0.98fr);
  gap: 44px;
  align-items: center;
  min-height: 640px;
}

.hero-copy h1 {
  margin: 0;
  font-size: clamp(2.8rem, 4.8vw, 4.4rem);
  line-height: 1.05;
  letter-spacing: -0.045em;
}

.eyebrow,
.section-kicker {
  margin: 0 0 14px;
  color: var(--teal-deep);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.84rem;
}

.hero-text,
.section-heading p,
.step-item p,
.tip-item p,
.faq-answer p,
.site-footer p {
  color: var(--muted);
  line-height: 1.8;
}

.hero-text {
  max-width: 720px;
  margin: 24px 0 0;
  font-size: 1.06rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 36px;
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  padding: 0;
  margin: 28px 0 0;
  list-style: none;
}

.hero-points li {
  padding: 10px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(223, 230, 236, 0.8);
  color: var(--muted);
}

.hero-visual img {
  width: 100%;
  filter: drop-shadow(var(--shadow));
}

.platforms,
.guide,
.faq-section {
  padding: 88px 0;
  border-top: 1px solid rgba(223, 230, 236, 0.8);
}

.section-heading {
  margin-bottom: 40px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(2rem, 3.2vw, 3rem);
  line-height: 1.12;
  letter-spacing: -0.04em;
}

.section-heading p {
  margin: 16px 0 0;
  max-width: 760px;
}

.section-heading.center {
  text-align: center;
}

.section-heading.center p {
  margin-left: auto;
  margin-right: auto;
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 18px;
}

.platform-card {
  padding: 28px 18px 22px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 24px;
  text-align: center;
  box-shadow: 0 12px 30px rgba(8, 24, 38, 0.04);
}

.platform-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 18px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  background: var(--teal-soft);
  color: var(--teal-deep);
}

.platform-icon svg {
  width: 30px;
  height: 30px;
  display: block;
}

.platform-card h3 {
  margin: 0;
  font-size: 1.1rem;
}

.platform-card p {
  margin: 8px 0 18px;
  color: var(--muted);
  min-height: 44px;
}

.card-btn {
  min-height: 46px;
  padding: 0 18px;
  background: var(--teal-soft);
  color: var(--teal-deep);
  border-radius: 14px;
  font-size: 0.94rem;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 52px;
}

.step-list,
.tip-list {
  display: grid;
  gap: 22px;
}

.step-item,
.tip-item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.step-number,
.tip-icon {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  margin-top: 4px;
  font-weight: 800;
}

.step-number {
  background: linear-gradient(135deg, var(--teal), #54e3d8);
  color: #fff;
}

.tip-icon {
  background: var(--teal-soft);
  color: var(--teal-deep);
}

.step-item h3,
.tip-item h3,
.site-footer h3 {
  margin: 0 0 8px;
  font-size: 1.08rem;
}

.step-item p,
.tip-item p {
  margin: 0;
}

.faq-list {
  display: grid;
  gap: 14px;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 14px 30px rgba(8, 24, 38, 0.04);
}

.faq-question {
  width: 100%;
  border: 0;
  padding: 24px 26px;
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  text-align: left;
  font: inherit;
  font-weight: 700;
  color: var(--text);
  cursor: pointer;
}

.faq-toggle {
  font-size: 1.35rem;
  color: var(--muted);
  transition: transform 0.2s ease;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.24s ease;
}

.faq-answer p {
  margin: 0;
  padding: 0 26px 24px;
}

.faq-item.active .faq-answer {
  max-height: 240px;
}

.faq-item.active .faq-toggle {
  transform: rotate(45deg);
}

.cta-section {
  padding: 0;
  background: linear-gradient(135deg, #24d0c3, #38d9cf 55%, #69ede2);
}

.cta-box {
  min-height: 370px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  color: #fff;
}

.cta-box h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -0.04em;
}

.cta-box p {
  max-width: 760px;
  color: rgba(255, 255, 255, 0.9);
}

.section-kicker.light {
  color: rgba(255, 255, 255, 0.82);
}

.site-footer {
  background: #05101a;
  color: #d8e4eb;
  padding: 72px 0 26px;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(2, minmax(180px, 0.6fr));
  gap: 32px;
}

.footer-brand {
  margin-bottom: 18px;
  color: #fff;
}

.site-footer a {
  display: block;
  margin: 12px 0;
  color: #d8e4eb;
}

.site-footer a:hover,
.site-footer a:focus-visible {
  color: #fff;
}

.footer-bottom {
  margin-top: 44px;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.09);
}

@media (max-width: 1180px) {
  .platform-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .site-nav {
    display: none;
  }

  .hero-inner,
  .guide-grid,
  .cta-box,
  .footer-grid {
    grid-template-columns: 1fr;
    display: grid;
  }

  .hero {
    padding-top: 30px;
  }

  .hero-inner {
    min-height: auto;
  }

  .hero-copy {
    order: 1;
  }

  .hero-visual {
    order: 2;
  }

  .cta-box {
    min-height: auto;
    padding: 72px 0;
  }
}

@media (max-width: 720px) {
  .container,
  .narrow {
    width: min(100% - 28px, 100%);
  }

  .header-inner {
    min-height: 72px;
  }

  .header-cta {
    padding: 12px 16px;
    font-size: 0.88rem;
  }

  .hero-copy h1,
  .section-heading h2,
  .cta-box h2 {
    letter-spacing: -0.03em;
  }

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

  .platform-card {
    padding: 22px 14px 18px;
  }

  .step-item,
  .tip-item {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 14px;
  }

  .faq-question {
    padding: 20px 18px;
    font-size: 0.97rem;
  }

  .faq-answer p {
    padding: 0 18px 20px;
  }
}

@media (max-width: 520px) {
  .brand-text {
    font-size: 1.05rem;
  }

  .header-cta {
    display: none;
  }

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

  .primary-btn,
  .ghost-btn,
  .dark-btn {
    width: 100%;
  }

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

  .hero-points {
    gap: 10px;
  }

  .hero-points li {
    width: 100%;
    text-align: center;
  }
}