:root {
  --paper: #f3f4f8;
  --indigo: #3d4db7;
  --cta: #1f9d55;
  --cta-deep: #187a42;
  --ink: #101828;
  --muted: #475467;
  --line: #d5d9e6;
  --card: #ffffff;
  --soft: #eef0f8;
  --chip: #e4e7f2;
  --warn: #7a2e0e;
  --warn-bg: #fff4e8;
  --radius: 28px;
  --wide: 980px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.8;
}

img,
svg {
  vertical-align: middle;
}

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

a:hover {
  text-decoration: underline;
}

.store-shell {
  width: min(var(--wide), calc(100% - 48px));
  margin: 36px auto 48px;
}

.store-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: 0 18px 48px rgba(16, 24, 40, 0.06);
  overflow: hidden;
}

.store-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 28px 40px 8px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.brand-mark:hover {
  text-decoration: none;
}

.pill-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px;
  background: var(--soft);
  border-radius: var(--radius);
}

.pill-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 88px;
  padding: 10px 18px;
  border-radius: var(--radius);
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
}

.pill-nav a:hover {
  text-decoration: none;
  background: #e3e6f3;
}

.pill-nav a.is-current {
  background: var(--indigo);
  color: #fff;
}

.hero-board {
  padding: 28px 40px 36px;
}

.hero-top {
  margin-bottom: 22px;
}

.get-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--radius);
  background: var(--cta);
  color: #fff;
  font-weight: 700;
  box-shadow: 0 10px 24px rgba(31, 157, 85, 0.22);
}

.get-btn:hover {
  background: var(--cta-deep);
  color: #fff;
  text-decoration: none;
}

.ghost-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: var(--radius);
  background: var(--soft);
  color: var(--indigo);
  font-weight: 700;
}

.ghost-btn:hover {
  text-decoration: none;
  background: var(--chip);
}

.hero-kicker {
  margin: 0 0 10px;
  color: var(--indigo);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.hero-board h1 {
  margin: 0 0 16px;
  font-size: 34px;
  line-height: 1.35;
}

.hero-board .lead,
.lead {
  margin: 0 0 14px;
  color: var(--muted);
}

.pack-note {
  margin: 0 0 8px;
  padding: 14px 18px;
  border-radius: 20px;
  background: var(--warn-bg);
  color: var(--warn);
  font-size: 14px;
}

.hero-cta-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 28px;
  padding: 14px 18px 14px 22px;
  border-radius: var(--radius);
  background: linear-gradient(90deg, #3d4db7 0%, #5160c6 100%);
  color: #fff;
}

.hero-cta-bar p {
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
}

.hero-cta-bar a {
  flex: 0 0 auto;
  padding: 10px 20px;
  border-radius: var(--radius);
  background: #fff;
  color: var(--indigo);
  font-size: 14px;
  font-weight: 700;
}

.hero-cta-bar a:hover {
  text-decoration: none;
  background: #eef1ff;
}

.store-main {
  padding: 8px 40px 20px;
}

.block {
  padding: 36px 0 8px;
}

.block + .block {
  border-top: 1px solid var(--line);
}

.block h2 {
  margin: 0 0 16px;
  font-size: 24px;
  line-height: 1.4;
}

.block h3 {
  margin: 20px 0 8px;
  font-size: 18px;
}

.block p {
  margin: 0 0 14px;
  color: var(--ink);
}

.block ul,
.block ol {
  margin: 0 0 16px;
  padding-left: 20px;
  color: var(--muted);
}

.block li + li {
  margin-top: 8px;
}

.compare-board {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 20px 0 8px;
}

.compare-pane {
  padding: 22px 22px 8px;
  border-radius: 24px;
  background: var(--soft);
}

.compare-pane h3 {
  margin-top: 0;
}

.os-equal {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin: 20px 0 8px;
}

.os-tile {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  min-height: 168px;
  padding: 18px 16px 16px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: #fff;
  color: var(--ink);
}

.os-tile:hover {
  border-color: var(--indigo);
  text-decoration: none;
}

.os-tile strong {
  display: block;
  margin: 12px 0 6px;
  font-size: 16px;
}

.os-tile span {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.os-tile.is-primary {
  border-color: transparent;
  background: #eaf8ef;
}

.feat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 18px 0 6px;
}

.feat-card {
  padding: 20px 20px 8px;
  border-radius: 24px;
  background: var(--soft);
}

.feat-card h3 {
  margin-top: 0;
}

.step-list {
  display: grid;
  gap: 12px;
  margin: 18px 0 10px;
}

.step-item {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 14px;
  padding: 16px 18px;
  border-radius: 24px;
  background: var(--soft);
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--indigo);
  color: #fff;
  font-weight: 700;
}

.req-table {
  width: 100%;
  margin: 16px 0 18px;
  border-collapse: collapse;
}

.req-table th,
.req-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  font-size: 14px;
}

.req-table th {
  width: 28%;
  color: var(--muted);
  font-weight: 600;
}

.faq-stack {
  display: grid;
  gap: 10px;
  margin: 18px 0 12px;
}

.faq-stack details {
  border-radius: var(--radius);
  background: var(--soft);
  padding: 4px 22px 4px;
}

.faq-stack summary {
  cursor: pointer;
  list-style: none;
  padding: 16px 0;
  font-weight: 700;
}

.faq-stack summary::-webkit-details-marker {
  display: none;
}

.faq-stack summary::after {
  float: right;
  color: var(--indigo);
  content: "+";
  font-size: 20px;
  font-weight: 500;
}

.faq-stack details[open] summary::after {
  content: "-";
}

.faq-stack details p {
  margin: 0 0 16px;
  color: var(--muted);
}

.news-feed {
  display: grid;
  gap: 12px;
  margin: 18px 0 10px;
}

.news-item {
  padding: 16px 18px 4px;
  border-radius: 24px;
  background: var(--soft);
}

.news-item time {
  display: block;
  margin-bottom: 4px;
  color: var(--indigo);
  font-size: 12px;
  font-weight: 700;
}

.news-item h3 {
  margin: 0 0 8px;
  font-size: 17px;
}

.risk-box {
  padding: 22px 22px 8px;
  border-radius: 24px;
  background: var(--warn-bg);
}

.risk-box h2,
.risk-box h3 {
  color: var(--warn);
}

.longform p {
  text-align: justify;
}

.cta-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin: 20px 0 8px;
  padding: 22px 24px;
  border-radius: var(--radius);
  background: var(--soft);
}

.cta-panel p {
  margin: 0;
  color: var(--muted);
}

.store-foot {
  padding: 20px 40px 32px;
  border-top: 1px solid var(--line);
}

.foot-nav {
  display: flex;
  gap: 18px;
  margin-bottom: 14px;
}

.foot-nav a.is-current {
  color: var(--ink);
  font-weight: 700;
}

.foot-lines p {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 13px;
}

.foot-copy {
  color: #667085 !important;
}

@media (max-width: 860px) {
  .store-shell {
    width: calc(100% - 24px);
    margin: 16px auto 28px;
  }

  .store-head,
  .hero-board,
  .store-main,
  .store-foot {
    padding-left: 20px;
    padding-right: 20px;
  }

  .store-head,
  .hero-cta-bar,
  .cta-panel {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-board h1 {
    font-size: 26px;
  }

  .compare-board,
  .feat-grid,
  .os-equal {
    grid-template-columns: 1fr;
  }

  .pill-nav {
    flex-wrap: wrap;
  }
}

@media (min-width: 700px) and (max-width: 860px) {
  .os-equal {
    grid-template-columns: 1fr 1fr;
  }
}