:root {
  color-scheme: light;
  --ink: #172026;
  --muted: #5f6f7a;
  --line: #dfe7ec;
  --paper: #ffffff;
  --soft: #f4f8f7;
  --green: #217a55;
  --green-soft: #dff2e8;
  --red: #b9493c;
  --red-soft: #f9e3df;
  --gold: #a96816;
  --gold-soft: #f8ead1;
  --blue: #27627a;
  --blue-soft: #dff0f5;
  --shadow: 0 18px 45px rgba(31, 56, 61, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.65;
  background: var(--soft);
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(223, 231, 236, 0.82);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(18px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1120px;
  min-height: 68px;
  margin: 0 auto;
  padding: 0 24px;
}

.brand {
  font-weight: 800;
  letter-spacing: 0;
}

.nav-links {
  display: flex;
  gap: 20px;
  color: var(--muted);
  font-size: 14px;
}

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

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(320px, 0.98fr);
  gap: 42px;
  align-items: center;
  max-width: 1120px;
  min-height: calc(100vh - 68px);
  margin: 0 auto;
  padding: 56px 24px 72px;
}

.hero-copy {
  max-width: 620px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--green);
  font-size: 14px;
  font-weight: 700;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.18;
}

h1 {
  max-width: 680px;
  font-size: clamp(42px, 7vw, 76px);
  letter-spacing: 0;
}

.no-wrap {
  white-space: nowrap;
}

h2 {
  font-size: clamp(30px, 4vw, 46px);
}

h3 {
  font-size: 22px;
}

p {
  margin: 0;
}

.lead {
  max-width: 640px;
  margin-top: 22px;
  color: var(--muted);
  font-size: 20px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  color: var(--ink);
  font-weight: 700;
}

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

.button:hover {
  transform: translateY(-1px);
}

.phone-wrap {
  display: flex;
  justify-content: center;
}

.phone {
  width: min(100%, 372px);
  border: 1px solid #ccdadf;
  border-radius: 34px;
  padding: 16px;
  background: #f8fbfb;
  box-shadow: var(--shadow);
}

.screen {
  overflow: hidden;
  border: 1px solid #e0eaee;
  border-radius: 24px;
  background: #ffffff;
}

.screen-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px;
}

.avatar-line {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
}

.avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, #7fc8a9, #f4c56b);
}

.score-card {
  margin: 0 18px 18px;
  padding: 22px;
  border-radius: 18px;
  background: #edf7f1;
}

.score-card strong {
  display: block;
  font-size: 42px;
  line-height: 1;
}

.score-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 18px;
  color: var(--muted);
  font-size: 13px;
}

.tab-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  padding: 0 18px 14px;
}

.tab {
  min-width: 0;
  border-radius: 999px;
  padding: 7px 8px;
  background: #f0f5f5;
  text-align: center;
  font-size: 12px;
  font-weight: 700;
}

.rule-list {
  display: grid;
  gap: 10px;
  padding: 0 18px 18px;
}

.rule-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 14px;
  border: 1px solid #e6eef1;
  border-radius: 12px;
}

.rule-item small {
  display: block;
  color: var(--muted);
}

.points {
  font-weight: 800;
}

.plus {
  color: var(--green);
}

.minus {
  color: var(--red);
}

.spend {
  color: var(--gold);
}

.section {
  max-width: 1120px;
  margin: 0 auto;
  padding: 72px 24px;
}

.section-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}

.section-header p {
  max-width: 560px;
  color: var(--muted);
}

.work-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 28px;
  align-items: stretch;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.work-body {
  padding: 32px;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 28px;
}

.tag {
  border-radius: 999px;
  padding: 6px 10px;
  background: var(--blue-soft);
  color: var(--blue);
  font-size: 13px;
  font-weight: 700;
}

.work-visual {
  display: grid;
  align-content: center;
  gap: 14px;
  padding: 28px;
  background: #f3faf7;
}

.mini-metric {
  border: 1px solid #d8e8e0;
  border-radius: 8px;
  padding: 16px;
  background: #ffffff;
}

.mini-metric strong {
  display: block;
  font-size: 28px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.feature,
.principle,
.module,
.flow-step {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 22px;
  background: var(--paper);
}

.feature p,
.principle p,
.module p,
.flow-step p {
  margin-top: 10px;
  color: var(--muted);
}

.module-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.module ul,
.rules ul {
  margin: 14px 0 0;
  padding-left: 20px;
  color: var(--muted);
}

.module li,
.rules li {
  margin-top: 6px;
}

.flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  counter-reset: step;
}

.flow-step::before {
  counter-increment: step;
  content: counter(step);
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  margin-bottom: 16px;
  border-radius: 50%;
  background: var(--green);
  color: #ffffff;
  font-weight: 800;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(320px, 1.15fr);
  gap: 28px;
  align-items: start;
}

.rules {
  border-left: 3px solid var(--green);
  padding-left: 24px;
}

.error-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 420px);
  gap: 42px;
  align-items: center;
  max-width: 1120px;
  min-height: calc(100vh - 125px);
  margin: 0 auto;
  padding: 56px 24px 72px;
}

.error-panel {
  border: 1px solid #d8e8e0;
  border-radius: 8px;
  padding: 34px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.error-panel-warning {
  border-color: #edd8bb;
}

.error-code {
  display: block;
  color: var(--green);
  font-size: clamp(72px, 13vw, 132px);
  font-weight: 800;
  line-height: 1;
}

.error-panel-warning .error-code {
  color: var(--gold);
}

.error-lines {
  display: grid;
  gap: 12px;
  margin: 28px 0;
}

.error-lines span {
  display: block;
  height: 12px;
  border-radius: 999px;
  background: #edf7f1;
}

.error-panel-warning .error-lines span {
  background: var(--gold-soft);
}

.error-lines span:nth-child(2) {
  width: 74%;
}

.error-lines span:nth-child(3) {
  width: 48%;
}

.error-panel p {
  color: var(--muted);
}

.footer {
  border-top: 1px solid var(--line);
  padding: 28px 24px;
  color: var(--muted);
  text-align: center;
  background: #ffffff;
}

@media (max-width: 860px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
    padding: 14px 20px;
  }

  .nav-links {
    flex-wrap: wrap;
    gap: 12px;
  }

  .hero,
  .work-card,
  .split,
  .error-hero {
    grid-template-columns: 1fr;
  }

  .hero,
  .error-hero {
    min-height: auto;
    padding-top: 42px;
  }

  .section-header {
    align-items: start;
    flex-direction: column;
  }

  .feature-grid,
  .module-grid,
  .flow {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .section {
    padding: 54px 18px;
  }

  .hero {
    padding: 36px 18px 54px;
  }

  .work-body,
  .work-visual {
    padding: 22px;
  }

  .actions {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .no-wrap {
    font-size: clamp(34px, 11vw, 42px);
  }
}