:root {
  --ink: #192c39;
  --muted: #52616b;
  --paper: #fffaf1;
  --paper-deep: #fff3d7;
  --page: #f7f3ea;
  --blue: #0d6f9f;
  --blue-dark: #0a587e;
  --line: rgba(36, 49, 61, 0.12);
  --gold: #eaa83c;
  --danger: #c85244;
  --white: #ffffff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--page);
  font-family: "PingFang SC", "STHeiti", "Songti SC", "Noto Sans CJK SC", sans-serif;
  font-size: 16px;
  line-height: 1.65;
}

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

img {
  max-width: 100%;
  height: auto;
}

.site {
  min-height: 100vh;
  background:
    radial-gradient(circle at 10% 0%, rgba(255, 193, 86, 0.2), transparent 24rem),
    linear-gradient(180deg, #fff8e8 0%, var(--page) 42rem);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(36, 49, 61, 0.09);
  background: rgba(255, 250, 241, 0.9);
  backdrop-filter: blur(14px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 12px 0;
}

.brand {
  display: inline-flex;
  flex-direction: column;
  color: var(--ink);
  font-weight: 900;
  line-height: 1.15;
}

.brand span {
  color: var(--blue);
  font-size: 12px;
  font-weight: 800;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

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

.button,
button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border: 0;
  border-radius: 8px;
  color: #fff;
  background: var(--blue);
  box-shadow: 0 10px 24px rgba(13, 111, 159, 0.2);
  cursor: pointer;
  font: inherit;
  font-size: 15px;
  font-weight: 900;
}

.button.secondary {
  color: var(--blue);
  background: #eef8fb;
  box-shadow: none;
}

.button.ghost {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--line);
  box-shadow: none;
}

.hero {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 42px 0 26px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
  gap: 24px;
  align-items: stretch;
}

.hero-copy {
  padding: 30px;
  border: 1px solid rgba(33, 67, 92, 0.12);
  border-radius: 0 0 22px 22px;
  background:
    linear-gradient(135deg, rgba(15, 112, 171, 0.12), rgba(255, 255, 255, 0.2)),
    radial-gradient(circle at 12% 18%, rgba(255, 193, 86, 0.3), transparent 28%),
    #fff6e5;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 900;
}

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

h1 {
  margin-bottom: 14px;
  font-size: clamp(34px, 7vw, 64px);
  line-height: 1.06;
  letter-spacing: 0;
}

.subtitle {
  max-width: 660px;
  margin-bottom: 18px;
  color: #40505b;
  font-size: 17px;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 24px;
}

.pill {
  padding: 6px 11px;
  border: 1px solid rgba(13, 111, 159, 0.22);
  border-radius: 999px;
  color: var(--blue-dark);
  background: rgba(255, 255, 255, 0.66);
  font-size: 13px;
  font-weight: 800;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.checkout-panel,
.card,
.plan-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 16px 40px rgba(25, 44, 57, 0.08);
}

.checkout-panel {
  padding: 22px;
  background: #fffdf7;
}

.panel-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.panel-head h2 {
  margin-bottom: 4px;
  font-size: 22px;
  line-height: 1.25;
}

.panel-head p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 13px;
}

.total-box {
  min-width: 96px;
  padding: 8px 10px;
  border-radius: 8px;
  color: var(--blue);
  background: #eef8fb;
  text-align: center;
}

.total-box span {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.total-box strong {
  font-size: 25px;
  line-height: 1;
}

.plan-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 16px;
}

.plan-option {
  position: relative;
  display: block;
}

.plan-option input {
  position: absolute;
  opacity: 0;
}

.plan-card {
  display: block;
  min-height: 136px;
  padding: 15px;
  cursor: pointer;
}

.plan-option input:checked + .plan-card {
  border-color: var(--blue);
  box-shadow: 0 0 0 2px rgba(13, 111, 159, 0.18);
}

.badge {
  display: inline-flex;
  margin-bottom: 8px;
  padding: 3px 9px;
  border-radius: 999px;
  color: var(--blue);
  background: #eef8fb;
  font-size: 12px;
  font-weight: 900;
}

.badge.featured {
  color: #fff;
  background: var(--blue);
}

.price {
  color: var(--blue);
  font-size: 32px;
  line-height: 1;
  font-weight: 900;
}

.plan-title {
  margin: 8px 0 4px;
  font-weight: 900;
}

.plan-desc {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.field {
  display: grid;
  gap: 6px;
}

.field.full {
  grid-column: 1 / -1;
}

label {
  color: #273946;
  font-size: 13px;
  font-weight: 900;
}

input,
select,
textarea {
  width: 100%;
  min-height: 42px;
  padding: 10px 11px;
  border: 1px solid rgba(36, 49, 61, 0.18);
  border-radius: 8px;
  color: var(--ink);
  background: #fff;
  font: inherit;
  font-size: 14px;
}

textarea {
  resize: vertical;
}

.form-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
}

.status {
  min-height: 22px;
  color: var(--muted);
  font-size: 13px;
}

.status.error {
  color: var(--danger);
}

.section {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0;
}

.section h2 {
  margin-bottom: 14px;
  font-size: 25px;
  line-height: 1.25;
}

.lead-box,
.note,
.warning {
  padding: 12px 14px;
  border-radius: 8px;
}

.lead-box {
  border: 1px solid rgba(234, 168, 60, 0.28);
  background: var(--paper-deep);
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.card {
  padding: 16px;
}

.card h3 {
  margin-bottom: 6px;
  color: var(--blue-dark);
  font-size: 16px;
}

.card p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 14px;
}

.steps {
  counter-reset: step;
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.steps li {
  counter-increment: step;
  position: relative;
  min-height: 42px;
  padding: 10px 12px 10px 48px;
  border: 1px solid rgba(13, 111, 159, 0.13);
  border-radius: 8px;
  background: #fff;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 12px;
  top: 12px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  color: #fff;
  background: var(--blue);
  font-size: 13px;
  line-height: 24px;
  text-align: center;
  font-weight: 900;
}

.value-table {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  border-collapse: separate;
  border-spacing: 0;
  overflow: hidden;
  background: #fff;
}

.value-table th,
.value-table td {
  padding: 11px 12px;
  border-bottom: 1px solid rgba(36, 49, 61, 0.08);
  text-align: left;
  vertical-align: top;
}

.value-table th {
  background: #eef3f5;
}

.value-table tr:last-child td {
  border-bottom: 0;
}

.note {
  border-left: 4px solid var(--blue);
  background: #eef8fb;
  color: #2e4856;
}

.warning {
  border-left: 4px solid var(--danger);
  background: #fff0ed;
  color: #643229;
}

.payment-result {
  display: none;
  margin-top: 18px;
  padding: 14px;
  border: 1px solid rgba(13, 111, 159, 0.2);
  border-radius: 8px;
  background: #eef8fb;
}

.payment-result.active {
  display: block;
}

.payment-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.payment-head h3 {
  margin-bottom: 4px;
  font-size: 17px;
  line-height: 1.35;
}

.payment-head p {
  margin-bottom: 0;
  color: #2e4856;
  font-size: 13px;
}

.copy-button {
  min-height: 36px;
  flex: 0 0 auto;
  padding: 0 12px;
  color: var(--blue);
  background: #fff;
  border: 1px solid rgba(13, 111, 159, 0.22);
  box-shadow: none;
  font-size: 13px;
}

.payment-steps {
  display: grid;
  gap: 8px;
  margin: 0 0 12px;
  padding: 0;
  list-style: none;
}

.payment-steps li {
  padding: 8px 10px;
  border: 1px solid rgba(13, 111, 159, 0.14);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.76);
  color: #2e4856;
  font-size: 13px;
  line-height: 1.55;
}

.payment-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  align-items: start;
}

.qr-card {
  padding: 10px;
  border-radius: 8px;
  background: #fff;
  text-align: center;
}

.qr-card img {
  border: 1px solid rgba(36, 49, 61, 0.1);
  border-radius: 8px;
}

.qr-card p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.faq-item {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
}

.faq-item h3 {
  margin-bottom: 7px;
  color: var(--blue-dark);
  font-size: 16px;
  line-height: 1.35;
}

.faq-item p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 14px;
}

.footer {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 30px 0 42px;
  color: #687782;
  font-size: 13px;
}

.guide-layout {
  width: min(900px, calc(100% - 32px));
  margin: 0 auto;
  padding: 34px 0;
}

.guide-hero {
  margin-bottom: 18px;
  padding: 24px;
  border-radius: 0 0 22px 22px;
  background:
    linear-gradient(135deg, rgba(15, 112, 171, 0.12), rgba(255, 255, 255, 0.2)),
    radial-gradient(circle at 12% 18%, rgba(255, 193, 86, 0.3), transparent 28%),
    #fff6e5;
  border: 1px solid rgba(33, 67, 92, 0.12);
}

.guide-hero h1 {
  font-size: clamp(30px, 6vw, 48px);
}

.guide-card {
  margin-bottom: 14px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
}

.guide-card h2 {
  margin-bottom: 12px;
  padding-bottom: 9px;
  border-bottom: 1px solid rgba(36, 49, 61, 0.08);
  color: var(--blue-dark);
  font-size: 20px;
}

.step-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.step-list li {
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(36, 49, 61, 0.08);
}

.step-list li:last-child {
  border-bottom: 0;
}

.step-n {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  color: #fff;
  background: var(--blue);
  font-size: 13px;
  line-height: 26px;
  text-align: center;
  font-weight: 900;
}

.step-img {
  display: block;
  width: min(100%, 520px);
  margin-top: 10px;
  border: 1px solid rgba(36, 49, 61, 0.1);
  border-radius: 8px;
}

.reference-pages {
  display: grid;
  gap: 14px;
}

.reference-pages img {
  border: 1px solid rgba(36, 49, 61, 0.1);
  border-radius: 8px;
  background: #fff;
}

code {
  padding: 2px 6px;
  border-radius: 5px;
  color: #a43f32;
  background: #f2e9df;
}

@media (max-width: 860px) {
  .hero-grid,
  .grid,
  .payment-grid,
  .faq-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 24px;
  }

  .hero-copy,
  .checkout-panel {
    padding: 20px;
  }

  .nav {
    align-items: flex-start;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 10px;
  }
}

@media (max-width: 560px) {
  .plan-options,
  .form-grid {
    grid-template-columns: 1fr;
  }

  .field.full {
    grid-column: auto;
  }

  .form-actions,
  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .button,
  button {
    width: 100%;
  }

  .payment-head {
    display: grid;
  }

  .panel-head {
    flex-direction: column;
  }
}