:root {
  --ink: #101512;
  --muted: #59635d;
  --paper: #fbfaf4;
  --paper-soft: #f1eee2;
  --line: #d8d1bd;
  --moss: #305640;
  --moss-dark: #183323;
  --gold: #c0903f;
  --coral: #b85f4d;
  --white: #fffdf6;
  --shadow: 0 24px 70px rgba(16, 21, 18, 0.18);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "Microsoft YaHei", serif;
  line-height: 1.72;
}

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

.wrap {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px max(20px, calc((100vw - 1160px) / 2));
  background: rgba(251, 250, 244, 0.92);
  border-bottom: 1px solid rgba(216, 209, 189, 0.8);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand img {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

.site-nav {
  display: flex;
  gap: 26px;
  color: var(--muted);
  font-size: 15px;
}

.site-nav a:hover,
.section-head a:hover,
.site-footer a:hover {
  color: var(--moss);
}

.header-cta,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--moss);
  border-radius: 6px;
  font-weight: 800;
  line-height: 1;
}

.header-cta,
.btn-primary {
  color: var(--white);
  background: var(--moss);
  box-shadow: 0 12px 30px rgba(48, 86, 64, 0.22);
}

.btn-primary:hover,
.header-cta:hover {
  background: var(--moss-dark);
}

.btn-light {
  color: var(--white);
  border-color: rgba(255, 253, 246, 0.7);
  background: rgba(255, 253, 246, 0.12);
}

.hero {
  position: relative;
  min-height: 720px;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  color: var(--white);
}

.hero-media,
.hero-shade {
  position: absolute;
  inset: 0;
}

.hero-media {
  background-image: url("../images/tu.webp");
  background-size: cover;
  background-position: center 28%;
  filter: saturate(0.92) contrast(1.05);
  transform: scale(1.02);
}

.hero-shade {
  background:
    linear-gradient(90deg, rgba(12, 19, 14, 0.86) 0%, rgba(12, 19, 14, 0.56) 44%, rgba(12, 19, 14, 0.18) 100%),
    linear-gradient(0deg, rgba(16, 21, 18, 0.84) 0%, rgba(16, 21, 18, 0) 42%);
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
  padding: 128px 0 54px;
}

.kicker,
.section-label {
  margin: 0 0 14px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(48px, 8vw, 112px);
  line-height: 0.98;
  letter-spacing: 0;
  word-break: keep-all;
  overflow-wrap: normal;
}

.hero-title-line {
  display: block;
  white-space: nowrap;
}

.hero-copy {
  max-width: 660px;
  margin: 26px 0 0;
  color: rgba(255, 253, 246, 0.9);
  font-size: 20px;
}

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

.proof {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  max-width: 900px;
  margin: 54px 0 0;
  padding: 0;
  background: rgba(255, 253, 246, 0.24);
}

.proof div {
  padding: 20px;
  background: rgba(16, 21, 18, 0.54);
}

.proof dt {
  color: rgba(255, 253, 246, 0.62);
  font-size: 13px;
}

.proof dd {
  margin: 4px 0 0;
  font-weight: 800;
}

section {
  padding: 92px 0;
}

.band {
  background: var(--paper-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.two-col {
  display: grid;
  grid-template-columns: 0.78fr 1.22fr;
  gap: 72px;
  align-items: start;
}

h2 {
  margin: 0;
  font-size: clamp(32px, 4vw, 56px);
  line-height: 1.14;
  letter-spacing: 0;
}

h3 {
  margin: 0;
  font-size: 24px;
  line-height: 1.28;
}

.reading p,
.faq p,
.final-cta p {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 18px;
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin-top: 42px;
  background: var(--line);
  border: 1px solid var(--line);
}

.feature-list article {
  min-height: 310px;
  padding: 28px;
  background: var(--paper);
}

.feature-list span {
  display: block;
  margin-bottom: 44px;
  color: var(--coral);
  font-weight: 900;
}

.feature-list p {
  margin: 16px 0 0;
  color: var(--muted);
}

.steps ol {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin: 38px 0 28px;
  padding: 0;
  list-style: none;
  counter-reset: steps;
}

.steps li {
  counter-increment: steps;
  min-height: 190px;
  padding: 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.steps li::before {
  content: counter(steps, decimal-leading-zero);
  display: block;
  margin-bottom: 24px;
  color: var(--gold);
  font-size: 30px;
  font-weight: 900;
}

.steps strong,
.steps span {
  display: block;
}

.steps span {
  margin-top: 8px;
  color: var(--muted);
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 38px;
}

.section-head a {
  color: var(--coral);
  font-weight: 900;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.article-grid a {
  display: grid;
  grid-template-columns: 112px 1fr auto;
  gap: 18px;
  align-items: center;
  min-height: 116px;
  padding: 22px;
  background: var(--paper);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.article-grid a:hover {
  background: var(--white);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.article-grid span {
  color: var(--coral);
  font-weight: 900;
}

.article-grid strong {
  font-size: 19px;
  line-height: 1.35;
}

.article-grid em {
  color: var(--muted);
  font-style: normal;
  white-space: nowrap;
}

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

details {
  padding: 22px 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

summary {
  cursor: pointer;
  font-size: 20px;
  font-weight: 900;
}

details p {
  margin: 14px 0 0;
}

.final-cta {
  color: var(--white);
  background: var(--moss-dark);
  text-align: center;
}

.final-cta p {
  color: rgba(255, 253, 246, 0.72);
}

.final-cta .btn-primary {
  margin-top: 12px;
  background: var(--gold);
  border-color: var(--gold);
}

.site-footer {
  padding: 28px 0;
  background: var(--ink);
  color: rgba(255, 253, 246, 0.72);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 20px;
}

.site-footer p {
  margin: 0;
}

.site-footer nav {
  display: flex;
  gap: 20px;
}

.article-page {
  background: var(--paper);
}

.article-hero {
  padding: 92px 0 54px;
  background: var(--moss-dark);
  color: var(--white);
}

.article-hero h1 {
  max-width: 940px;
  margin: 0;
  font-size: clamp(38px, 6vw, 72px);
  line-height: 1.05;
}

.article-meta {
  margin-top: 22px;
  color: rgba(255, 253, 246, 0.7);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
  color: rgba(255, 253, 246, 0.68);
  font-size: 14px;
}

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

.article-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 70px;
  align-items: start;
  padding: 64px 0 88px;
}

.article-content {
  max-width: 780px;
}

.lead {
  margin-top: 0;
  padding: 24px;
  color: var(--ink) !important;
  background: var(--white);
  border-left: 4px solid var(--gold);
  font-size: 20px !important;
}

.article-content p,
.article-content li {
  color: var(--muted);
  font-size: 18px;
}

.article-content h2 {
  margin-top: 48px;
  font-size: 34px;
}

.article-content h2:first-child {
  margin-top: 0;
}

.article-content a {
  color: var(--moss);
  font-weight: 900;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.article-side {
  position: sticky;
  top: 96px;
  padding: 22px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.article-side h2 {
  font-size: 24px;
}

.article-side a {
  width: 100%;
  margin-top: 16px;
}

.side-link {
  display: inline-flex;
  justify-content: center;
  color: var(--moss);
  font-weight: 900;
}

.article-faq,
.related {
  margin-top: 56px;
}

.article-faq details {
  margin-top: 12px;
}

.related-grid {
  display: grid;
  gap: 12px;
}

.related-grid a {
  display: grid;
  gap: 6px;
  padding: 18px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  text-decoration: none;
}

.related-grid span {
  color: var(--coral);
  font-weight: 900;
}

.related-grid strong {
  color: var(--ink);
}

@media (max-width: 900px) {
  .site-header {
    flex-wrap: wrap;
  }

  .site-nav {
    order: 3;
    width: 100%;
    justify-content: space-between;
    gap: 12px;
  }

  .hero {
    min-height: 680px;
  }

  .proof,
  .two-col,
  .feature-list,
  .steps ol,
  .article-grid,
  .article-layout {
    grid-template-columns: 1fr;
  }

  .section-head,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .article-grid a {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .article-side {
    position: static;
  }
}

@media (max-width: 560px) {
  .wrap,
  .hero-inner {
    width: min(100% - 28px, 1160px);
  }

  .header-cta {
    width: 100%;
  }

  .hero-copy {
    font-size: 17px;
  }

  section {
    padding: 66px 0;
  }
}