/* 第4套·cn：卡片栅格落地页，先平台后功能 */
:root {
  --bg: #e8edf4;
  --bg-soft: #f4f6fa;
  --card: #ffffff;
  --ink: #1b2430;
  --muted: #5a6878;
  --line: #d5dde8;
  --indigo: #3730a3;
  --indigo-mid: #4338ca;
  --indigo-soft: #eef0ff;
  --vermilion: #c2410c;
  --vermilion-deep: #9a3412;
  --ok: #166534;
  --shadow: 0 10px 28px rgba(28, 41, 58, 0.08);
  --radius: 16px;
  --yahei: "Microsoft YaHei", "微软雅黑", "PingFang SC", "Noto Sans SC", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: auto;
  background: var(--bg);
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(900px 420px at 8% -10%, rgba(67, 56, 202, 0.12), transparent 58%),
    radial-gradient(700px 360px at 100% 8%, rgba(194, 65, 12, 0.08), transparent 50%),
    var(--bg);
  font-family: var(--yahei);
  font-size: 16.5px;
  line-height: 1.85;
}

img,
svg {
  max-width: 100%;
  vertical-align: middle;
}

a {
  color: var(--indigo-mid);
  text-underline-offset: 3px;
}

p {
  margin: 0 0 0.95em;
  text-align: justify;
}

h1,
h2,
h3 {
  font-weight: 700;
  line-height: 1.35;
  color: #111827;
}

h1 {
  margin: 0 0 14px;
  font-size: clamp(26px, 4vw, 40px);
}

h2 {
  margin: 0 0 12px;
  font-size: clamp(20px, 2.4vw, 26px);
}

h3 {
  margin: 0 0 8px;
  font-size: 17px;
  color: var(--indigo);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(160deg, var(--indigo-mid), var(--indigo));
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brand-name {
  display: block;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.brand-sub {
  display: block;
  margin-top: 2px;
  font-size: 12px;
  color: var(--muted);
}

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

.nav a {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 999px;
  text-decoration: none;
  color: #334155;
  background: var(--bg-soft);
  font-weight: 700;
}

.nav a:hover,
.nav a.is-current,
.nav a[aria-current="page"] {
  background: var(--indigo);
  color: #fff;
}

.hero {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 24px;
  align-items: center;
  padding: 36px 0 18px;
}

.hero-panel,
.card,
.faq,
.cta {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-panel {
  padding: 28px 28px 22px;
}

.kicker {
  display: inline-block;
  margin: 0 0 10px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--indigo-soft);
  color: var(--indigo);
  font-size: 13px;
  font-weight: 700;
}

.lead {
  font-size: 18px;
  color: #334155;
}

.hero-aside {
  padding: 22px;
}

.hero-aside ol {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 16px 0 6px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 18px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 800;
  border: 1px solid transparent;
}

.btn-win {
  background: var(--vermilion);
  color: #fff;
}

.btn-win:hover {
  background: var(--vermilion-deep);
  color: #fff;
}

.btn-primary {
  background: var(--indigo);
  color: #fff;
}

.btn-primary:hover {
  background: #312e81;
  color: #fff;
}

.btn-ghost {
  background: #fff;
  color: var(--indigo);
  border-color: #c7cce8;
}

.btn-ghost:hover {
  background: var(--indigo-soft);
  color: var(--indigo);
}

.note {
  font-size: 13.5px;
  color: var(--muted);
  text-align: left;
}

.section {
  padding: 18px 0 8px;
}

.section-intro {
  margin-bottom: 16px;
}

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

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

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

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

.card {
  padding: 18px 18px 14px;
  min-width: 0;
}

.card .icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  margin-bottom: 10px;
  background: var(--indigo-soft);
  color: var(--indigo);
}

.card .icon.win {
  background: #fff1e8;
  color: var(--vermilion);
}

.card .meta {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 13.5px;
}

.stat strong {
  display: block;
  font-size: 28px;
  line-height: 1.2;
  color: var(--indigo);
}

.review .who {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 13px;
}

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

.steps li {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 12px;
  padding: 16px 18px;
  margin-bottom: 12px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.steps li::before {
  counter-increment: step;
  content: counter(step);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--indigo);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 800;
}

.faq {
  padding: 16px 18px 8px;
  margin-bottom: 12px;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 22px;
  margin: 8px 0 20px;
  background: linear-gradient(135deg, #312e81, var(--indigo-mid));
  color: #eef2ff;
  border: 0;
}

.cta p,
.cta h2,
.cta .cta-title {
  color: #fff;
  text-align: left;
}

.cta .cta-title {
  margin: 0 0 8px;
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
}

.cta .btn-win,
.cta .btn-ghost {
  background: #fff;
  color: var(--indigo);
}

.site-footer {
  margin-top: 20px;
  padding: 22px 0 28px;
  background: #1e1b4b;
  color: #d8dcf3;
}

.site-footer .wrap p {
  margin: 0 0 8px;
  text-align: left;
  font-size: 13.5px;
}

@media (max-width: 960px) {
  .hero,
  .grid-4,
  .grid-3 {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 720px) {
  .hero,
  .grid-4,
  .grid-3,
  .grid-2,
  .steps li {
    grid-template-columns: 1fr;
  }

  .hero-panel,
  .hero-aside {
    padding: 20px 16px 16px;
  }
}