:root {
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-active: #1e40af;
  --color-primary-soft: #eff6ff;
  --color-accent: #f59e0b;
  --color-accent-soft: #fffbeb;
  --color-wechat: #07c160;
  --color-text: #111827;
  --color-text-secondary: #4b5563;
  --color-text-muted: #6b7280;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-border: #e5e7eb;
  --color-border-strong: #cbd5e1;
  --color-dark: #07111f;
  --color-dark-2: #0f172a;
  --container: 1180px;
  --radius-sm: 6px;
  --radius: 8px;
  --radius-lg: 14px;
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 4px 12px rgba(15, 23, 42, 0.07);
  --shadow-md: 0 16px 36px rgba(15, 23, 42, 0.12);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
}

body.is-locked {
  overflow: hidden;
}

a {
  color: inherit;
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

svg {
  display: block;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.pb-skip {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  transform: translateY(-160%);
  padding: 10px 14px;
  color: #fff;
  background: var(--color-primary);
  border-radius: var(--radius-sm);
  font-weight: 700;
}

.pb-skip:focus {
  transform: translateY(0);
}

.pb-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid rgba(226, 232, 240, 0.9);
  box-shadow: 0 2px 14px rgba(15, 23, 42, 0.06);
  backdrop-filter: blur(16px);
}

.pb-header__inner,
.pg-container,
.pb-footer__inner {
  width: min(var(--container), calc(100% - 40px));
  margin: 0 auto;
}

.pb-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 24px;
}

.pb-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex: 0 0 auto;
}

.pb-brand__mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  color: #fff;
  background: linear-gradient(135deg, var(--color-primary), #06b6d4);
  border-radius: 11px;
  box-shadow: 0 10px 24px rgba(37, 99, 235, 0.28);
  font-size: 20px;
  font-weight: 900;
  line-height: 1;
}

.pb-brand__meta {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.pb-brand__t {
  color: var(--color-text);
  font-size: 21px;
  font-weight: 850;
  line-height: 1.15;
}

.pb-brand__s {
  color: var(--color-text-muted);
  font-size: 12px;
  letter-spacing: 0;
  line-height: 1.35;
}

.pb-nav {
  flex: 1 1 auto;
}

.pb-nav__head {
  display: none;
}

.pb-nav__list {
  display: flex;
  justify-content: center;
  gap: 4px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.pb-nav__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  color: var(--color-text-secondary);
  border-radius: var(--radius);
  text-decoration: none;
  font-size: 15px;
  font-weight: 700;
  white-space: nowrap;
  transition: color 0.2s ease, background 0.2s ease;
}

.pb-nav__link:hover {
  color: var(--color-primary);
  background: var(--color-primary-soft);
}

.pb-header__act {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.pb-btn,
.pg-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.pb-btn:hover,
.pg-btn:hover {
  transform: translateY(-1px);
}

.pb-btn--icon {
  width: 42px;
  height: 42px;
  padding: 0;
  background: var(--color-bg-alt);
  border-color: var(--color-border);
}

.pb-btn--icon:hover {
  color: var(--color-primary);
  border-color: rgba(37, 99, 235, 0.3);
}

.pb-btn--ghost {
  min-height: 40px;
  padding: 0 16px;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-color: rgba(37, 99, 235, 0.14);
}

.pb-btn--primary,
.pg-btn--primary {
  color: #fff;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
  box-shadow: 0 12px 26px rgba(37, 99, 235, 0.28);
}

.pb-btn--primary:hover,
.pg-btn--primary:hover {
  background: linear-gradient(135deg, var(--color-primary-hover), var(--color-primary-active));
}

.pb-btn--outline,
.pg-btn--outline {
  color: var(--color-primary);
  background: #fff;
  border-color: rgba(37, 99, 235, 0.28);
}

.pb-btn--outline:hover,
.pg-btn--outline:hover {
  background: var(--color-primary-soft);
  border-color: rgba(37, 99, 235, 0.46);
}

.pb-btn--wechat {
  color: #fff;
  background: var(--color-wechat);
}

.pg-btn--ghost {
  color: rgba(255, 255, 255, 0.9);
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.14);
}

.pg-btn--ghost:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.13);
}

.pg-btn--white {
  color: var(--color-primary-active);
  background: #fff;
  border-color: #fff;
  box-shadow: 0 12px 26px rgba(15, 23, 42, 0.14);
}

.pg-btn--ghost-white {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.26);
}

.pg-btn--warning {
  color: #78350f;
  background: #fef3c7;
  border-color: #fde68a;
}

.pg-btn--lg {
  min-height: 44px;
  padding: 0 18px;
  font-size: 14px;
}

.pg-btn--xl {
  min-height: 52px;
  padding: 0 24px;
  font-size: 16px;
}

.pb-ico,
.pg-ico {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
}

.pb-ico--sm,
.pg-ico--sm {
  width: 16px;
  height: 16px;
}

.pb-burger,
.pb-burger::before,
.pb-burger::after {
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
  border-radius: 999px;
}

.pb-burger {
  position: relative;
}

.pb-burger::before,
.pb-burger::after {
  content: "";
  position: absolute;
  left: 0;
}

.pb-burger::before {
  top: -6px;
}

.pb-burger::after {
  top: 6px;
}

.pg-main {
  overflow: hidden;
}

.pg-hero {
  position: relative;
  min-height: calc(100vh - 72px);
  color: #fff;
  isolation: isolate;
  background: var(--color-dark);
}

.pg-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
}

.pg-hero__gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 45% at 18% 8%, rgba(37, 99, 235, 0.35), transparent 60%),
    radial-gradient(ellipse 55% 40% at 90% 18%, rgba(6, 182, 212, 0.22), transparent 58%),
    radial-gradient(ellipse 45% 42% at 52% 88%, rgba(245, 158, 11, 0.14), transparent 62%),
    linear-gradient(180deg, #081120 0%, #0f172a 62%, #111827 100%);
}

.pg-hero__pattern {
  position: absolute;
  inset: 0;
  opacity: 0.28;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(180deg, transparent 0%, #000 18%, #000 80%, transparent 100%);
}

.pg-hero__content {
  max-width: 900px;
  padding: 118px 0 96px;
}

.pg-hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  color: #dbeafe;
  background: rgba(37, 99, 235, 0.16);
  border: 1px solid rgba(147, 197, 253, 0.22);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 800;
}

.pg-ico--filled {
  fill: currentColor;
  stroke: none;
}

.pg-hero__title {
  max-width: 900px;
  margin: 22px 0 18px;
  color: #fff;
  font-size: 56px;
  line-height: 1.12;
  letter-spacing: 0;
}

.pg-hero__intro {
  max-width: 760px;
  margin: 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: 18px;
}

.pg-hero__tip,
.pg-hero__wechat {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: 760px;
  margin: 18px 0 0;
  padding: 10px 12px;
  color: rgba(255, 255, 255, 0.86);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
}

.pg-hero__wechat {
  display: flex;
  width: fit-content;
  margin-top: 12px;
}

.pg-hero__wechat-label {
  color: rgba(255, 255, 255, 0.68);
}

.pg-hero__wechat-value {
  color: #fff;
}

.pg-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.pg-hero__actions--secondary {
  margin-top: 14px;
}

.pg-hero__trust {
  display: inline-flex;
  align-items: center;
  gap: 24px;
  margin-top: 38px;
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.pg-hero__trust-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.pg-hero__trust-num {
  color: #fff;
  font-size: 30px;
  font-weight: 900;
  line-height: 1;
}

.pg-hero__trust-label {
  color: rgba(255, 255, 255, 0.66);
  font-size: 13px;
}

.pg-hero__trust-divider {
  width: 1px;
  align-self: stretch;
  min-height: 42px;
  background: rgba(255, 255, 255, 0.14);
}

.pg-hero__scroll {
  position: absolute;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  width: 24px;
  height: 42px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
}

.pg-hero__scroll-line {
  position: absolute;
  left: 50%;
  top: 9px;
  width: 3px;
  height: 10px;
  transform: translateX(-50%);
  background: #fff;
  border-radius: 999px;
  animation: scroll-dot 1.7s ease-in-out infinite;
}

@keyframes scroll-dot {
  0%, 100% { opacity: 0.4; transform: translate(-50%, 0); }
  50% { opacity: 1; transform: translate(-50%, 12px); }
}

.pg-section {
  padding: 84px 0;
}

.pg-section--alt {
  background: var(--color-bg-alt);
}

.pg-section__header {
  margin-bottom: 34px;
}

.pg-section__header--center {
  max-width: 760px;
  margin-right: auto;
  margin-left: auto;
  text-align: center;
}

.pg-section__header--between {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
}

.pg-section__title {
  margin: 0 0 10px;
  color: var(--color-text);
  font-size: 34px;
  line-height: 1.25;
  letter-spacing: 0;
}

.pg-section__desc {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 15px;
}

.pg-scenes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.pg-scene-card {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-areas:
    "icon title arrow"
    "icon desc arrow";
  column-gap: 16px;
  align-items: center;
  min-height: 138px;
  padding: 22px;
  color: inherit;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  text-align: left;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

button.pg-scene-card {
  width: 100%;
  font: inherit;
}

.pg-scene-card:hover {
  border-color: rgba(37, 99, 235, 0.34);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.pg-scene-card--primary {
  color: #fff;
  background: linear-gradient(135deg, var(--color-primary), #06b6d4);
  border-color: transparent;
}

.pg-scene-card__icon {
  grid-area: icon;
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-radius: 14px;
}

.pg-scene-card--primary .pg-scene-card__icon {
  color: #fff;
  background: rgba(255, 255, 255, 0.16);
}

.pg-scene-card__title {
  grid-area: title;
  margin: 0;
  font-size: 17px;
  line-height: 1.35;
}

.pg-scene-card__desc {
  grid-area: desc;
  margin: 5px 0 0;
  color: var(--color-text-muted);
  font-size: 13px;
}

.pg-scene-card--primary .pg-scene-card__desc {
  color: rgba(255, 255, 255, 0.8);
}

.pg-scene-card__arrow {
  grid-area: arrow;
  color: var(--color-primary);
}

.pg-scene-card--primary .pg-scene-card__arrow {
  color: #fff;
}

.pg-paths {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.pg-path {
  padding: 24px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.pg-path__header {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--color-border);
}

.pg-path__icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-radius: 14px;
  flex: 0 0 auto;
}

.pg-path__title {
  margin: 0 0 4px;
  font-size: 20px;
  line-height: 1.3;
}

.pg-path__desc {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 14px;
}

.pg-path__list {
  display: grid;
  gap: 10px;
  padding: 18px 0 0;
  margin: 0;
  list-style: none;
}

.pg-path__link {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 13px 14px;
  color: inherit;
  background: var(--color-bg-alt);
  border: 1px solid transparent;
  border-radius: var(--radius);
  text-decoration: none;
}

.pg-path__link:hover {
  color: var(--color-primary);
  background: #fff;
  border-color: rgba(37, 99, 235, 0.26);
}

.pg-path__link-title {
  font-weight: 800;
}

.pg-path__link-reason {
  color: var(--color-text-muted);
  font-size: 13px;
  text-align: right;
  flex: 0 0 auto;
}

.pg-compare {
  display: grid;
  gap: 18px;
}

.pg-compare__table-wrap {
  overflow-x: auto;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.pg-compare-table {
  width: 100%;
  min-width: 780px;
  border-collapse: collapse;
}

.pg-compare-table th,
.pg-compare-table td {
  padding: 17px 18px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

.pg-compare-table thead th {
  color: #fff;
  background: var(--color-primary-active);
  font-size: 14px;
}

.pg-compare-table tbody th {
  color: var(--color-primary-active);
  background: #f8fafc;
  font-weight: 850;
}

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

.pg-compare__footer,
.pg-section__footer {
  display: flex;
  justify-content: center;
  margin-top: 10px;
}

.pg-knowledge-blocks {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.pg-knowledge-block {
  padding: 24px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.pg-knowledge-title {
  margin: 0 0 18px;
  color: var(--color-primary-active);
  font-size: 20px;
  line-height: 1.3;
}

.pg-knowledge-content h4 {
  margin: 20px 0 8px;
  font-size: 15px;
}

.pg-knowledge-content h4:first-child {
  margin-top: 0;
}

.pg-knowledge-content p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 14px;
}

.pg-faq {
  max-width: 860px;
  margin: 0 auto;
}

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

.pg-faq-item {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  overflow: hidden;
}

.pg-faq-question {
  position: relative;
  padding: 18px 52px 18px 20px;
  font-weight: 850;
  cursor: pointer;
}

.pg-faq-question::after {
  content: "";
  position: absolute;
  top: 50%;
  right: 22px;
  width: 9px;
  height: 9px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: translateY(-65%) rotate(45deg);
  color: var(--color-primary);
  transition: transform 0.2s ease;
}

.pg-faq-item[open] .pg-faq-question::after {
  transform: translateY(-35%) rotate(225deg);
}

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

.pg-faq-answer p {
  margin: 0;
  color: var(--color-text-muted);
}

.pg-topics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.pg-topic-card {
  min-height: 124px;
  padding: 20px;
  color: inherit;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.pg-topic-card:hover {
  border-color: rgba(37, 99, 235, 0.34);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.pg-topic-card__title {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.35;
}

.pg-topic-card__desc {
  margin: 0;
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 800;
}

.pg-updates {
  display: grid;
  gap: 10px;
}

.pg-update-item {
  display: grid;
  grid-template-columns: 110px 1fr auto;
  gap: 18px;
  align-items: center;
  padding: 16px 18px;
  color: inherit;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
}

.pg-update-item:hover {
  color: var(--color-primary);
  border-color: rgba(37, 99, 235, 0.3);
}

.pg-update-item__date {
  color: var(--color-text-muted);
  font-size: 13px;
}

.pg-update-item__title {
  font-weight: 750;
}

.pg-update-item__arrow {
  color: var(--color-primary);
}

.pg-security {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 18px;
  align-items: center;
  padding: 24px;
  background: var(--color-accent-soft);
  border: 1px solid #fde68a;
  border-radius: var(--radius-lg);
}

.pg-security__icon {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  color: #92400e;
  background: #fef3c7;
  border-radius: 16px;
}

.pg-security__icon .pg-ico {
  width: 28px;
  height: 28px;
}

.pg-security__title {
  margin: 0 0 4px;
  color: #78350f;
  font-size: 22px;
}

.pg-security__text {
  margin: 0;
  color: #92400e;
}

.pg-cta {
  position: relative;
  color: #fff;
  background: var(--color-dark);
  isolation: isolate;
}

.pg-cta__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
}

.pg-cta__gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 70% at 50% 0%, rgba(37, 99, 235, 0.32), transparent 62%),
    linear-gradient(180deg, #0f172a, #07111f);
}

.pg-cta__pattern {
  position: absolute;
  inset: 0;
  opacity: 0.24;
  background-image:
    linear-gradient(135deg, rgba(255, 255, 255, 0.1) 25%, transparent 25%),
    linear-gradient(225deg, rgba(255, 255, 255, 0.08) 25%, transparent 25%);
  background-size: 44px 44px;
}

.pg-cta__inner {
  max-width: 780px;
  margin: 0 auto;
  text-align: center;
}

.pg-cta__title {
  margin: 0 0 12px;
  color: #fff;
  font-size: 38px;
  line-height: 1.22;
}

.pg-cta__desc {
  margin: 0;
  color: rgba(255, 255, 255, 0.76);
  font-size: 16px;
}

.pg-cta__actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.pb-footer {
  color: rgba(255, 255, 255, 0.76);
  background: #0b1020;
}

.pb-footer__inner {
  padding: 54px 0 32px;
}

.pb-footer__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}

.pb-footer__col {
  margin: 0;
}

.pb-footer__col dt,
.pb-footer__col-group {
  margin-bottom: 12px;
  color: #fff;
  font-size: 15px;
  font-weight: 850;
}

.pb-footer__col dd {
  margin: 8px 0 0;
}

.pb-footer a {
  color: inherit;
  text-decoration: none;
}

.pb-footer a:hover {
  color: #fff;
}

.pb-footer__tags {
  display: flex;
  align-items: center;
  gap: 18px;
  padding-top: 28px;
  margin-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.pb-footer__tags-title {
  margin: 0;
  color: #fff;
  font-size: 15px;
}

.pb-footer__tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.pb-footer__tags-link {
  display: inline-flex;
  padding: 5px 11px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 999px;
  font-size: 13px;
}

.pb-footer__bottom {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding-top: 24px;
  margin-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 13px;
}

.pb-footer__legal,
.pb-footer__info {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
}

.pb-backtop {
  position: fixed;
  right: 22px;
  bottom: 24px;
  z-index: 90;
  color: #fff;
  background: var(--color-primary);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
}

.pb-backtop.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.pb-float {
  position: fixed;
  right: 22px;
  top: 45%;
  z-index: 80;
  display: grid;
  gap: 10px;
}

.pb-float__btn {
  min-width: 76px;
  min-height: 42px;
  padding: 0 13px;
  box-shadow: var(--shadow-md);
}

.pb-mobile-bar {
  display: none;
}

.pb-help-popup {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  padding: 20px;
}

.pb-help-popup[hidden] {
  display: none;
}

.pb-help-popup__overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.58);
  border: 0;
}

.pb-help-popup__content {
  position: relative;
  z-index: 1;
  width: min(430px, calc(100vw - 32px));
  max-height: min(78vh, 640px);
  overflow: auto;
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 60px rgba(15, 23, 42, 0.28);
}

.pb-help-popup__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  border-bottom: 1px solid var(--color-border);
}

.pb-help-popup__title {
  margin: 0;
  font-size: 18px;
}

.pb-help-popup__close {
  width: 36px;
  height: 36px;
}

.pb-help-popup__body {
  display: grid;
  gap: 14px;
  padding: 20px;
}

.pb-help-popup__card {
  padding: 16px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.pb-help-popup__card h4 {
  margin: 0 0 8px;
}

.pb-help-popup__card p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 14px;
}

.pb-help-popup__action {
  width: 100%;
  min-height: 42px;
  margin-top: 14px;
}

@media (max-width: 1100px) {
  .pg-scenes {
    grid-template-columns: repeat(2, 1fr);
  }

  .pg-knowledge-blocks,
  .pg-topics {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  html {
    scroll-padding-top: 78px;
  }

  body {
    padding-bottom: 72px;
  }

  .pb-header__inner,
  .pg-container,
  .pb-footer__inner {
    width: min(100% - 32px, var(--container));
  }

  .pb-nav {
    position: fixed;
    inset: 0 0 0 auto;
    z-index: 120;
    width: min(360px, 86vw);
    padding: 0;
    background: #fff;
    box-shadow: -18px 0 50px rgba(15, 23, 42, 0.2);
    transform: translateX(105%);
    transition: transform 0.24s ease;
  }

  .pb-nav.is-open {
    transform: translateX(0);
  }

  .pb-nav__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 16px;
    border-bottom: 1px solid var(--color-border);
  }

  .pb-nav__list {
    display: grid;
    justify-content: stretch;
    gap: 0;
    padding: 10px;
  }

  .pb-nav__link {
    display: flex;
    min-height: 50px;
    padding: 0 14px;
  }

  .pb-header__support {
    display: none;
  }

  .pb-header__menu {
    display: inline-flex;
  }

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

  .pg-hero__content {
    padding: 86px 0 78px;
  }

  .pg-hero__title {
    font-size: 42px;
  }

  .pg-paths,
  .pg-security {
    grid-template-columns: 1fr;
  }

  .pg-security__btn {
    width: fit-content;
  }

  .pb-footer__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pb-footer__bottom,
  .pb-footer__tags {
    align-items: flex-start;
    flex-direction: column;
  }

  .pb-float,
  .pb-backtop {
    display: none;
  }

  .pb-mobile-bar {
    position: fixed;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 90;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    min-height: 64px;
    padding-bottom: env(safe-area-inset-bottom);
    background: rgba(255, 255, 255, 0.96);
    border-top: 1px solid var(--color-border);
    box-shadow: 0 -8px 28px rgba(15, 23, 42, 0.08);
    backdrop-filter: blur(14px);
  }

  .pb-mobile-bar__item {
    display: grid;
    place-items: center;
    align-content: center;
    gap: 3px;
    min-width: 0;
    min-height: 64px;
    padding: 4px 0;
    color: var(--color-text-muted);
    background: transparent;
    border: 0;
    text-decoration: none;
    font-size: 12px;
    font-weight: 800;
  }

  .pb-mobile-bar__help {
    color: var(--color-primary);
  }
}

@media (min-width: 901px) {
  .pb-header__menu {
    display: none;
  }
}

@media (max-width: 680px) {
  .pb-header__inner,
  .pg-container,
  .pb-footer__inner {
    width: min(100% - 28px, var(--container));
  }

  .pb-brand__s {
    display: none;
  }

  .pb-brand__t {
    font-size: 19px;
  }

  .pg-hero__content {
    padding: 68px 0 76px;
  }

  .pg-hero__title {
    font-size: 34px;
  }

  .pg-hero__intro {
    font-size: 16px;
  }

  .pg-hero__tip,
  .pg-hero__wechat {
    align-items: flex-start;
    width: 100%;
  }

  .pg-btn--xl,
  .pg-btn--lg {
    width: 100%;
  }

  .pg-hero__trust {
    display: grid;
    grid-template-columns: 1fr;
    width: 100%;
    gap: 16px;
  }

  .pg-hero__trust-divider {
    display: none;
  }

  .pg-section {
    padding: 58px 0;
  }

  .pg-section__header--between {
    align-items: flex-start;
    flex-direction: column;
  }

  .pg-section__title,
  .pg-cta__title {
    font-size: 27px;
  }

  .pg-scenes,
  .pg-knowledge-blocks,
  .pg-topics {
    grid-template-columns: 1fr;
  }

  .pg-scene-card {
    min-height: 120px;
    padding: 18px;
  }

  .pg-scene-card__icon {
    width: 48px;
    height: 48px;
  }

  .pg-path {
    padding: 18px;
  }

  .pg-path__link {
    flex-direction: column;
    gap: 3px;
  }

  .pg-path__link-reason {
    text-align: left;
  }

  .pg-update-item {
    grid-template-columns: 1fr auto;
    gap: 8px 14px;
  }

  .pg-update-item__date {
    grid-column: 1 / -1;
  }

  .pb-footer__grid {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}