:root {
  --cases-ink: #28231f;
  --cases-muted: #6f6860;
  --cases-paper: #fbf8f1;
  --cases-cream: #f3ecdf;
  --cases-line: #ded4c5;
  --cases-green: #123f35;
  --cases-green-soft: #e8efeb;
  --cases-burgundy: #972b3b;
  --cases-gold: #7a501c;
  --cases-white: #fffdf8;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body.kv-cases {
  margin: 0;
  overflow-x: hidden;
  color: var(--cases-ink);
  background: var(--cases-paper);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  letter-spacing: 0;
}

body.kv-cases .kv-site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1180px, calc(100% - 48px));
  min-height: 76px;
  margin: 0 auto;
  border-bottom: 1px solid rgba(40, 35, 31, 0.1);
  background: rgba(251, 248, 241, 0.96);
  backdrop-filter: blur(14px);
}

body.kv-cases .kv-site-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--cases-ink);
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}

body.kv-cases .kv-site-mark {
  display: inline-grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 7px;
  color: var(--cases-white);
  background: var(--cases-green);
  font-family: Georgia, "Times New Roman", serif;
}

body.kv-cases .kv-site-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

body.kv-cases .kv-site-links a {
  color: var(--cases-muted);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

body.kv-cases .kv-site-links a:hover,
body.kv-cases .kv-site-links a[aria-current="page"] {
  color: var(--cases-green);
}

.cases-page {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
}

.cases-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.65fr);
  gap: clamp(44px, 7vw, 94px);
  align-items: end;
  padding: clamp(88px, 11vw, 152px) 0 clamp(72px, 9vw, 112px);
  border-bottom: 1px solid var(--cases-line);
}

.cases-kicker {
  margin: 0 0 20px;
  color: var(--cases-gold);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.cases-hero h1,
.cases-section-head h2,
.cases-final h2 {
  margin: 0;
  font-family: "Songti SC", SimSun, "Noto Serif CJK SC", Georgia, serif;
  letter-spacing: 0;
}

body.kv-cases .cases-hero h1 {
  color: var(--cases-green);
  font-size: clamp(54px, 6vw, 72px);
  font-weight: 700;
  line-height: 1.06;
}

.cases-lead {
  max-width: 760px;
  margin: 34px 0 0;
  color: var(--cases-muted);
  font-size: clamp(18px, 1.65vw, 23px);
  line-height: 1.9;
}

.cases-hero__statement {
  padding: 8px 0 10px 26px;
  border-left: 4px solid var(--cases-burgundy);
}

.cases-hero__statement p {
  margin: 0 0 12px;
  color: var(--cases-muted);
  font-size: 14px;
  line-height: 1.8;
}

.cases-hero__statement strong {
  display: block;
  color: var(--cases-ink);
  font-size: 22px;
  line-height: 1.65;
}

.cases-proof {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-bottom: 1px solid var(--cases-line);
}

.cases-proof article {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 18px;
  min-width: 0;
  padding: 32px 30px;
  border-right: 1px solid var(--cases-line);
}

.cases-proof article:first-child {
  padding-left: 0;
}

.cases-proof article:last-child {
  padding-right: 0;
  border-right: 0;
}

.cases-proof span {
  color: var(--cases-burgundy);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 15px;
  font-weight: 700;
}

.cases-proof h2,
.cases-proof p {
  margin: 0;
}

.cases-proof h2 {
  color: var(--cases-green);
  font-size: 17px;
  line-height: 1.4;
}

.cases-proof p {
  margin-top: 8px;
  color: var(--cases-muted);
  font-size: 14px;
  line-height: 1.75;
}

.cases-source-note {
  max-width: 850px;
  margin: 22px 0 0;
  color: var(--cases-muted);
  font-size: 13px;
  line-height: 1.75;
}

.cases-featured,
.cases-compact {
  padding: clamp(88px, 11vw, 144px) 0 0;
}

.cases-section-head {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 0.7fr);
  column-gap: clamp(48px, 8vw, 110px);
  align-items: end;
  margin-bottom: 52px;
}

.cases-section-head .cases-kicker {
  grid-column: 1 / -1;
}

.cases-section-head h2 {
  color: var(--cases-ink);
  font-size: clamp(38px, 5.2vw, 68px);
  line-height: 1.08;
}

.cases-section-head > p:last-child {
  margin: 0;
  color: var(--cases-muted);
  font-size: 16px;
  line-height: 1.9;
}

.case-featured {
  padding: 54px 0;
  border-top: 1px solid var(--cases-line);
}

.case-featured:last-child {
  border-bottom: 1px solid var(--cases-line);
}

.case-featured--accent {
  position: relative;
}

.case-featured--accent::before {
  position: absolute;
  inset: 18px -28px;
  z-index: -1;
  content: "";
  background: rgba(243, 236, 223, 0.72);
}

.case-featured__head {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.case-number {
  display: inline-grid;
  width: 66px;
  height: 66px;
  place-items: center;
  border: 1px solid rgba(151, 43, 59, 0.24);
  color: var(--cases-burgundy);
  background: var(--cases-white);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 24px;
  font-weight: 700;
}

.case-category {
  margin: 0 0 10px;
  color: var(--cases-gold);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.case-featured h3 {
  max-width: 900px;
  margin: 0;
  color: var(--cases-green);
  font-family: "Songti SC", SimSun, "Noto Serif CJK SC", Georgia, serif;
  font-size: clamp(30px, 3.3vw, 46px);
  line-height: 1.22;
}

.case-featured__body {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: 42px 0 0 100px;
  border-top: 1px solid var(--cases-line);
  border-left: 1px solid var(--cases-line);
}

.case-featured__body > div {
  min-width: 0;
  padding: 28px 30px 30px;
  border-right: 1px solid var(--cases-line);
  border-bottom: 1px solid var(--cases-line);
  background: rgba(255, 253, 248, 0.62);
}

.case-featured__body h4 {
  margin: 0 0 12px;
  color: var(--cases-burgundy);
  font-size: 15px;
}

.case-featured__body p,
.case-featured__body li {
  color: var(--cases-muted);
  font-size: 15px;
  line-height: 1.85;
}

.case-featured__body p {
  margin: 0;
}

.case-featured__body ul {
  display: grid;
  gap: 6px;
  margin: 0;
  padding-left: 1.15em;
}

.case-avoid {
  margin: 20px 0 0 100px;
  padding: 18px 24px;
  color: var(--cases-muted);
  background: var(--cases-green-soft);
  font-size: 15px;
  line-height: 1.8;
}

.case-avoid strong {
  color: var(--cases-green);
}

.case-category-group {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 48px;
  padding: 42px 0;
  border-top: 1px solid var(--cases-line);
}

.case-category-group:last-child {
  border-bottom: 1px solid var(--cases-line);
}

.case-category-group > header {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 16px;
  align-content: start;
}

.case-category-group > header > span {
  display: inline-grid;
  width: 34px;
  height: 34px;
  place-items: center;
  color: var(--cases-white);
  background: var(--cases-green);
  font-size: 13px;
  font-weight: 800;
}

.case-category-group h3,
.case-category-group p {
  margin: 0;
}

.case-category-group h3 {
  color: var(--cases-green);
  font-size: 22px;
}

.case-category-group header p {
  margin-top: 10px;
  color: var(--cases-muted);
  font-size: 14px;
  line-height: 1.75;
}

.case-compact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.case-compact-card,
.case-method-card {
  min-width: 0;
  padding: 28px;
  border: 1px solid var(--cases-line);
  background: var(--cases-white);
}

.case-compact-card h4,
.case-method-card h4 {
  margin: 0;
  color: var(--cases-ink);
  font-family: "Songti SC", SimSun, "Noto Serif CJK SC", Georgia, serif;
  font-size: 23px;
  line-height: 1.42;
}

.case-compact-card p,
.case-method-card p {
  margin: 18px 0;
  color: var(--cases-muted);
  font-size: 14px;
  line-height: 1.85;
}

.case-compact-card strong {
  display: block;
  padding-top: 16px;
  border-top: 1px solid var(--cases-line);
  color: var(--cases-green);
  font-size: 14px;
  line-height: 1.75;
}

.case-method-card {
  position: relative;
  display: flex;
  min-height: 100%;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
  border-color: rgba(180, 135, 70, 0.28);
  background: rgba(243, 236, 223, 0.78);
}

.case-method-card::after {
  position: absolute;
  right: -10px;
  bottom: -44px;
  color: rgba(19, 68, 56, 0.055);
  content: "?";
  font-family: Georgia, "Times New Roman", serif;
  font-size: 180px;
  line-height: 1;
  pointer-events: none;
}

.case-method-card span {
  position: relative;
  z-index: 1;
  display: block;
  margin-bottom: 14px;
  color: var(--cases-gold);
  font-size: 13px;
  font-weight: 800;
}

.case-method-card h4,
.case-method-card p {
  position: relative;
  z-index: 1;
}

.case-method-card h4 {
  color: var(--cases-green);
}

.case-method-card p {
  margin-bottom: 0;
}

.cases-final {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 48px;
  align-items: end;
  margin: clamp(90px, 11vw, 150px) 0 100px;
  padding: clamp(46px, 6vw, 72px);
  color: var(--cases-white);
  background: var(--cases-green);
}

.cases-final .cases-kicker {
  color: #d8b777;
}

.cases-final h2 {
  max-width: 680px;
  color: var(--cases-white);
  font-size: clamp(38px, 4.5vw, 58px);
  line-height: 1.15;
}

.cases-final p:last-child {
  max-width: 720px;
  margin: 24px 0 0;
  color: rgba(255, 253, 248, 0.72);
  font-size: 16px;
  line-height: 1.85;
}

.cases-final__actions {
  display: grid;
  gap: 12px;
  width: 300px;
}

.cases-button {
  display: inline-flex;
  min-height: 54px;
  align-items: center;
  justify-content: center;
  padding: 14px 22px;
  border: 1px solid rgba(255, 253, 248, 0.28);
  color: var(--cases-white);
  font-size: 15px;
  font-weight: 800;
  text-align: center;
  text-decoration: none;
}

body.kv-cases .cases-final .cases-button--primary {
  color: var(--cases-green);
  background: var(--cases-white);
}

body.kv-cases .cases-final .cases-button--secondary {
  color: var(--cases-white);
}

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

.cases-button:focus-visible,
body.kv-cases a:focus-visible {
  outline: 3px solid #d8b777;
  outline-offset: 4px;
}

body.kv-cases .kv-site-footer {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  padding: 34px 0 48px;
  border-top: 1px solid var(--cases-line);
  color: var(--cases-muted);
  font-size: 13px;
  line-height: 1.7;
}

body.kv-cases .kv-site-footer strong {
  color: var(--cases-green);
  white-space: nowrap;
}

@media (max-width: 900px) {
  body.kv-cases .kv-site-nav {
    display: grid;
    width: calc(100% - 36px);
    padding: 14px 0 10px;
  }

  body.kv-cases .kv-site-links {
    width: 100%;
    gap: 18px;
    padding-top: 12px;
    overflow-x: auto;
    scrollbar-width: none;
  }

  body.kv-cases .kv-site-links::-webkit-scrollbar {
    display: none;
  }

  body.kv-cases .kv-site-links a {
    flex: 0 0 auto;
  }

  .cases-page {
    width: calc(100% - 36px);
  }

  .cases-hero,
  .cases-section-head,
  .cases-final {
    grid-template-columns: 1fr;
  }

  .cases-hero {
    gap: 40px;
    padding-top: 72px;
  }

  .cases-proof {
    grid-template-columns: 1fr;
  }

  .cases-proof article,
  .cases-proof article:first-child,
  .cases-proof article:last-child {
    padding: 24px 0;
    border-right: 0;
    border-bottom: 1px solid var(--cases-line);
  }

  .cases-proof article:last-child {
    border-bottom: 0;
  }

  .cases-section-head {
    gap: 24px;
  }

  .case-category-group {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .cases-final__actions {
    width: 100%;
  }
}

@media (max-width: 680px) {
  body.kv-cases .cases-hero h1 {
    font-size: clamp(42px, 12vw, 48px);
  }

  .cases-lead {
    font-size: 17px;
    line-height: 1.8;
  }

  .cases-hero__statement strong {
    font-size: 19px;
  }

  .cases-featured,
  .cases-compact {
    padding-top: 82px;
  }

  .cases-section-head h2 {
    font-size: 38px;
  }

  .case-featured {
    padding: 42px 0;
  }

  .case-featured--accent::before {
    inset: 12px -18px;
  }

  .case-featured__head {
    grid-template-columns: 54px minmax(0, 1fr);
    gap: 16px;
  }

  .case-number {
    width: 50px;
    height: 50px;
    font-size: 18px;
  }

  .case-featured h3 {
    font-size: 29px;
  }

  .case-featured__body {
    grid-template-columns: 1fr;
    margin: 30px 0 0;
  }

  .case-featured__body > div {
    padding: 24px 22px;
  }

  .case-avoid {
    margin-left: 0;
    padding: 17px 20px;
  }

  .case-compact-grid {
    grid-template-columns: 1fr;
  }

  .case-compact-card {
    padding: 24px 22px;
  }

  .cases-final {
    margin-bottom: 72px;
    padding: 38px 24px;
  }

  .cases-final h2 {
    font-size: 36px;
  }

  body.kv-cases .kv-site-footer {
    display: grid;
    width: calc(100% - 36px);
    gap: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .cases-button {
    transition: none;
  }
}