:root {
  --bg: #f7f9fc;
  --panel: #ffffff;
  --panel-soft: #f1f5f9;
  --text: #182230;
  --muted: #5f6f82;
  --line: #d9e2ec;
  --primary: #1764ff;
  --primary-dark: #0b4ed8;
  --accent: #10a37f;
  --warning: #b54708;
  --code: #0f172a;
  --shadow: 0 10px 30px rgba(24, 34, 48, 0.08);
  --radius: 8px;
  --sidebar: 260px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

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

a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -48px;
  z-index: 1000;
  padding: 8px 12px;
  background: var(--text);
  color: #fff;
  border-radius: 6px;
}

.skip-link:focus {
  top: 12px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 60;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 0 28px;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: max-content;
  font-weight: 700;
  color: var(--text);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  color: #fff;
  background: var(--primary);
  border-radius: 7px;
  font-size: 14px;
  letter-spacing: 0;
}

.topnav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
  white-space: nowrap;
}

.topnav a {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 7px 10px;
  border-radius: 7px;
  color: var(--muted);
  font-size: 14px;
}

.topnav a:hover,
.topnav a[aria-current="page"] {
  background: var(--panel-soft);
  color: var(--text);
  text-decoration: none;
}

.menu-button {
  display: none;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  margin-left: auto;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
  color: var(--text);
  cursor: pointer;
}

.menu-icon,
.menu-icon::before,
.menu-icon::after {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 99px;
  content: "";
}

.menu-icon {
  position: relative;
}

.menu-icon::before {
  position: absolute;
  top: -6px;
}

.menu-icon::after {
  position: absolute;
  top: 6px;
}

.layout {
  display: grid;
  grid-template-columns: var(--sidebar) minmax(0, 1fr);
  max-width: 1320px;
  margin: 0 auto;
}

.sidebar {
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  padding: 28px 18px 32px 26px;
  overflow-y: auto;
  border-right: 1px solid var(--line);
}

.sidebar-title {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
}

.sidebar a {
  display: block;
  padding: 7px 10px;
  border-radius: 7px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.45;
}

.sidebar a:hover,
.sidebar a.active {
  background: #eaf1ff;
  color: var(--primary-dark);
  text-decoration: none;
}

.content {
  min-width: 0;
  padding: 42px 44px 72px;
}

.doc {
  max-width: 920px;
}

.hero {
  padding: 34px 0 22px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--primary);
  font-size: 14px;
  font-weight: 700;
}

h1,
h2,
h3 {
  line-height: 1.25;
  letter-spacing: 0;
}

h1 {
  margin: 0;
  font-size: 44px;
}

h2 {
  margin: 46px 0 16px;
  padding-top: 10px;
  font-size: 28px;
}

h3 {
  margin: 26px 0 10px;
  font-size: 20px;
}

.lead {
  max-width: 760px;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 19px;
}

.hero-actions,
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
  color: var(--text);
  font-weight: 650;
  line-height: 1.25;
}

.button:hover {
  background: var(--panel-soft);
  color: var(--text);
  text-decoration: none;
}

.button.primary {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
}

.button.primary:hover {
  border-color: var(--primary-dark);
  background: var(--primary-dark);
  color: #fff;
}

.button.accent {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.button.accent:hover {
  filter: brightness(0.95);
  color: #fff;
}

.notice {
  margin: 28px 0;
  padding: 16px 18px;
  border: 1px solid #f7d7a6;
  border-left: 4px solid #f59e0b;
  border-radius: var(--radius);
  background: #fff8ed;
  color: #5f3b00;
}

.grid {
  display: grid;
  gap: 16px;
}

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

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

.card,
.case-card,
.prompt-card,
.faq-item {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: 0 2px 10px rgba(24, 34, 48, 0.03);
}

.card h3,
.case-card h3,
.prompt-card h3 {
  margin-top: 0;
}

.card p,
.case-card p,
.prompt-card p {
  margin-bottom: 0;
  color: var(--muted);
}

.step-list {
  display: grid;
  gap: 14px;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.step-list li {
  position: relative;
  padding: 16px 18px 16px 58px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.step-list li::before {
  position: absolute;
  left: 18px;
  top: 17px;
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: #eaf1ff;
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 700;
  counter-increment: step;
  content: counter(step);
}

.compare-table,
.data-table {
  width: 100%;
  margin: 18px 0;
  border-collapse: collapse;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.compare-table th,
.compare-table td,
.data-table th,
.data-table td {
  padding: 13px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.compare-table th,
.data-table th {
  background: #f4f7fb;
  font-weight: 700;
}

.compare-table tr:last-child td,
.data-table tr:last-child td {
  border-bottom: 0;
}

.toc-note {
  margin-top: 22px;
  padding: 14px;
  border-radius: var(--radius);
  background: #eefaf7;
  color: #085e4a;
  font-size: 14px;
}

.breadcrumb {
  margin-bottom: 22px;
  color: var(--muted);
  font-size: 14px;
}

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

.code-block {
  overflow-x: auto;
  margin: 14px 0;
  padding: 16px;
  border-radius: var(--radius);
  background: var(--code);
  color: #e2e8f0;
  font-size: 14px;
  line-height: 1.65;
  white-space: pre-wrap;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 2px 8px;
  border-radius: 999px;
  background: #eef2f7;
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
}

.download-panel {
  padding: 26px;
  border: 1px solid #b7d7ff;
  border-radius: var(--radius);
  background: #f2f8ff;
}

.footer {
  border-top: 1px solid var(--line);
  background: #fff;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 24px;
  max-width: 1320px;
  margin: 0 auto;
  padding: 30px 44px;
  color: var(--muted);
  font-size: 14px;
}

.footer h2,
.footer h3 {
  margin: 0 0 8px;
  padding: 0;
  color: var(--text);
  font-size: 16px;
}

.footer p {
  margin: 0 0 8px;
}

.footer a {
  display: inline-block;
  margin-right: 12px;
}

.overlay {
  display: none;
}

.float-popup {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 120;
  width: min(360px, calc(100vw - 24px));
  max-height: 62vh;
  color: #101828;
  background: rgba(255, 255, 255, 0.98);
  border: 1px solid rgba(213, 220, 232, 0.9);
  border-radius: 20px;
  box-shadow: 0 16px 42px rgba(16, 24, 40, 0.18);
  opacity: 0;
  transform: translate3d(0, 26px, 0) scale(0.96);
  transition: opacity 240ms ease, transform 240ms ease;
  overflow: hidden;
}

.float-popup.is-visible {
  opacity: 1;
  transform: translate3d(0, 0, 0) scale(1);
}

.float-popup-ribbon {
  position: absolute;
  left: 0;
  top: 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 32px;
  padding: 6px 18px 6px 16px;
  border-bottom-right-radius: 14px;
  background: linear-gradient(135deg, #ff7619, #f2550a);
  color: #fff;
  font-size: 13px;
  font-weight: 800;
  line-height: 1;
}

.float-popup-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #fff;
}

.float-popup-close {
  position: absolute;
  right: 14px;
  top: 14px;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border: 0;
  border-radius: 50%;
  background: #eef2f7;
  color: #98a2b3;
  font-size: 23px;
  line-height: 1;
  cursor: pointer;
}

.float-popup-close:hover {
  background: #e4e9f1;
  color: #667085;
}

.float-popup-inner {
  padding: 48px 16px 10px;
}

.float-popup-title-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.float-popup-title-row strong {
  font-size: 18px;
  line-height: 1.15;
  letter-spacing: 0;
}

.float-popup-icon {
  font-size: 20px;
  line-height: 1;
}

.float-popup-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 24px;
  padding: 2px 8px;
  border-radius: 9px;
  background: #fb5b13;
  color: #fff;
  font-size: 13px;
  font-weight: 800;
  line-height: 1;
  white-space: nowrap;
}

.float-popup-description {
  margin: 6px 0 8px;
  color: #66758f;
  font-size: 12px;
  line-height: 1.35;
}

.float-popup-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0 0 8px;
  padding: 8px 8px;
  border-radius: 12px;
  background: linear-gradient(120deg, #f2f0ff, #ecfaf7);
}

.float-popup-stats > div {
  display: grid;
  justify-items: center;
  gap: 3px;
}

.float-popup-stats > div + div {
  border-left: 1px solid rgba(142, 154, 176, 0.22);
}

.float-popup-stat-value {
  color: #755df6;
  font-size: 17px;
  font-weight: 850;
  line-height: 1.1;
}

.float-popup-stat-label {
  color: #8b9ab0;
  font-size: 11px;
  font-weight: 700;
}

.float-popup-coupon {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-bottom: 8px;
  font-size: 12px;
}

.float-popup-coupon-label {
  color: #66758f;
  font-weight: 750;
}

.float-popup-coupon-code {
  min-width: 86px;
  padding: 4px 8px;
  border: 2px dashed #ffb181;
  border-radius: 12px;
  background: #fff5eb;
  color: #df4e0a;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 14px;
  line-height: 1;
  text-align: center;
}

.float-popup-copy {
  min-height: 26px;
  padding: 4px 7px;
  font-size: 12px;
  border: 1px solid #ffd1b5;
  border-radius: 8px;
  background: #fff;
  color: #c2410c;
  font-weight: 700;
  cursor: pointer;
}

.float-popup-primary {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, #ff7118, #f24a08);
  color: #fff;
  font-size: 15px;
  font-weight: 850;
  box-shadow: 0 10px 22px rgba(242, 83, 11, 0.2);
}

.float-popup-primary:hover {
  color: #fff;
  text-decoration: none;
  filter: brightness(0.98);
}

.float-popup-primary::after {
  margin-left: 8px;
  content: "→";
}

.float-popup-features {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin: 7px 0;
  color: #0db779;
  font-size: 12px;
  font-weight: 750;
}

.float-popup-secondary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 112px;
  align-items: center;
  gap: 14px;
  margin-top: 8px;
  padding: 12px;
  border: 1px solid #dfcffd;
  border-radius: 16px;
  background: linear-gradient(120deg, #fbf8ff 0%, #fffaf7 100%);
  color: #101828;
  min-height: 112px;
}

.float-popup-secondary:hover {
  color: #101828;
  text-decoration: none;
  border-color: #c7adff;
  background: linear-gradient(120deg, #f8f3ff 0%, #fff8f1 100%);
}

.float-popup-secondary-text {
  min-width: 0;
  display: grid;
  gap: 5px;
  align-content: center;
}

.float-popup-secondary-title,
.float-popup-secondary-subtitle {
  display: block;
  line-height: 1.22;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  word-break: keep-all;
}

.float-popup-secondary-title {
  font-weight: 800;
  font-size: 15px;
}

.float-popup-secondary-subtitle {
  color: #8358ff;
  font-size: 12px;
  font-weight: 700;
}

.float-popup-secondary-qr {
  display: grid;
  justify-items: center;
  min-width: 0;
}

.float-popup-secondary-qr img,
.float-popup-secondary-qr-placeholder {
  display: grid;
  place-items: center;
  width: 88px;
  height: 88px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #fff;
  color: #98a2b3;
  font-size: 12px;
  object-fit: cover;
}

.float-popup-secondary-caption {
  display: block;
  max-width: 112px;
  color: #667085;
  font-size: 10px;
  font-weight: 650;
  line-height: 1.2;
  text-align: center;
}

@media (max-width: 980px) {
  .topbar {
    padding: 0 16px;
  }

  .topnav {
    display: none;
  }

  .menu-button {
    display: inline-flex;
  }

  .layout {
    display: block;
  }

  .sidebar {
    position: fixed;
    inset: 64px auto 0 0;
    z-index: 80;
    width: min(86vw, 320px);
    height: calc(100vh - 64px);
    transform: translateX(-104%);
    transition: transform 160ms ease;
    background: #fff;
    box-shadow: var(--shadow);
  }

  body.sidebar-open .sidebar {
    transform: translateX(0);
  }

  .overlay {
    position: fixed;
    inset: 64px 0 0;
    z-index: 70;
    background: rgba(15, 23, 42, 0.28);
  }

  body.sidebar-open .overlay {
    display: block;
  }

  .content {
    padding: 28px 18px 58px;
  }

  h1 {
    font-size: 34px;
  }

  h2 {
    font-size: 24px;
  }

  .lead {
    font-size: 17px;
  }

  .grid.cols-2,
  .grid.cols-3 {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    padding: 28px 18px;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 15px;
  }

  .brand span:last-child {
    max-width: 190px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .hero {
    padding-top: 22px;
  }

  h1 {
    font-size: 30px;
  }

  .hero-actions,
  .button-row {
    display: grid;
  }

  .button {
    width: 100%;
  }

  .compare-table,
  .data-table {
    display: block;
    overflow-x: auto;
  }

  .float-popup {
    right: 12px;
    bottom: 12px;
    width: calc(100vw - 24px);
    max-height: 62vh;
    border-radius: 22px;
  }

  .float-popup-inner {
    padding: 48px 14px 10px;
  }

  .float-popup-title-row strong {
    font-size: 17px;
  }

  .float-popup-description {
    font-size: 12px;
  }

  .float-popup-primary {
    min-height: 40px;
    font-size: 15px;
  }

  .float-popup-secondary {
    grid-template-columns: minmax(0, 1fr) 96px;
    min-height: 104px;
    gap: 10px;
    padding: 10px;
  }

  .float-popup-secondary-title {
    font-size: 15px;
  }

  .float-popup-secondary-subtitle {
    font-size: 12px;
  }

  .float-popup-secondary-qr img,
  .float-popup-secondary-qr-placeholder {
    width: 74px;
    height: 74px;
  }

  .float-popup-secondary-caption {
    max-width: 96px;
    font-size: 9px;
  }

  .float-popup-features {
    flex-wrap: wrap;
    gap: 8px 14px;
  }
}