:root {
  --ink: #1e2329;
  --ink-soft: #3f474f;
  --paper: #f7f4ee;
  --paper-deep: #eee8dd;
  --line: rgba(30, 35, 41, 0.14);
  --navy: #17263a;
  --wine: #6f2431;
  --gold: #b18a57;
  --gold-soft: #d9c6a6;
  --white: #ffffff;
  --shadow: 0 24px 70px rgba(32, 35, 38, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family:
    "Inter",
    "HarmonyOS Sans SC",
    "PingFang SC",
    "Microsoft YaHei",
    sans-serif;
  letter-spacing: 0;
}

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

img {
  display: block;
  max-width: 100%;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(22px, 5vw, 72px);
  background: rgba(247, 244, 238, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.brand-symbol {
  width: 44px;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  color: var(--white);
  background: var(--navy);
  font-size: 15px;
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 20px;
  font-family:
    "Noto Serif SC",
    "Source Han Serif SC",
    "Songti SC",
    serif;
  font-weight: 700;
}

.brand small {
  margin-top: 2px;
  color: var(--ink-soft);
  font-size: 12px;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 34px;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 650;
}

.desktop-nav a {
  position: relative;
  padding: 30px 0;
}

.desktop-nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 22px;
  left: 0;
  height: 2px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}

.desktop-nav a:hover::after,
.desktop-nav a.active::after {
  transform: scaleX(1);
}

.menu-button {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line);
  background: transparent;
  cursor: pointer;
}

.menu-button span {
  display: block;
  width: 20px;
  height: 2px;
  margin: 5px auto;
  background: var(--ink);
}

.mobile-nav {
  display: none;
}

main {
  overflow: hidden;
}

.hero {
  min-height: calc(100vh - 78px);
  display: grid;
  grid-template-columns: minmax(320px, 0.92fr) minmax(360px, 1.08fr);
  gap: clamp(32px, 6vw, 82px);
  align-items: center;
  padding: clamp(58px, 8vw, 108px) clamp(22px, 5vw, 72px);
  background:
    linear-gradient(115deg, rgba(247, 244, 238, 1) 0%, rgba(247, 244, 238, 0.94) 54%, rgba(238, 232, 221, 1) 100%);
}

.eyebrow,
.section-kicker {
  margin-bottom: 18px;
  color: var(--wine);
  font-size: 13px;
  font-weight: 800;
}

h1 {
  margin-bottom: 22px;
  font-family:
    "Noto Serif SC",
    "Source Han Serif SC",
    "Songti SC",
    serif;
  font-size: clamp(56px, 8vw, 112px);
  line-height: 1.02;
  font-weight: 700;
}

.hero-title {
  max-width: 680px;
  margin-bottom: 22px;
  color: var(--navy);
  font-family:
    "Noto Serif SC",
    "Source Han Serif SC",
    "Songti SC",
    serif;
  font-size: clamp(28px, 4vw, 58px);
  line-height: 1.14;
  font-weight: 700;
}

.hero-text,
.intro-copy p,
.service-feature p,
.service-list p,
.method-steps p,
.contact p {
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.85;
}

.hero-text {
  max-width: 650px;
  margin-bottom: 34px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.button-primary,
.button-secondary {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  font-size: 15px;
  font-weight: 750;
  border: 1px solid transparent;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.button-primary {
  color: var(--white);
  background: var(--navy);
}

.button-secondary {
  color: var(--navy);
  border-color: rgba(23, 38, 58, 0.28);
}

.button-primary:hover,
.button-secondary:hover {
  transform: translateY(-2px);
}

.button-secondary:hover {
  color: var(--white);
  background: var(--wine);
  border-color: var(--wine);
}

.hero-visual {
  position: relative;
  min-height: 540px;
  overflow: hidden;
  background: var(--navy);
  box-shadow: var(--shadow);
}

.hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(0deg, rgba(23, 38, 58, 0.72), rgba(23, 38, 58, 0.08)),
    linear-gradient(90deg, rgba(23, 38, 58, 0.52), rgba(23, 38, 58, 0));
}

.hero-visual img,
.method-visual img,
.service-feature img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.58) contrast(0.96) brightness(0.9);
}

.hero-note {
  position: absolute;
  right: 26px;
  bottom: 26px;
  z-index: 1;
  width: min(320px, calc(100% - 52px));
  padding: 22px;
  color: var(--white);
  background: rgba(23, 38, 58, 0.88);
  border: 1px solid rgba(255, 255, 255, 0.16);
}

.hero-note strong,
.hero-note span {
  display: block;
}

.hero-note strong {
  margin-bottom: 8px;
  color: var(--gold-soft);
  font-size: 20px;
}

.hero-note span {
  color: rgba(255, 255, 255, 0.76);
  font-size: 14px;
}

.trust-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 0 clamp(22px, 5vw, 72px);
  background: var(--navy);
  color: var(--white);
}

.trust-strip div {
  min-height: 148px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border-left: 1px solid rgba(255, 255, 255, 0.16);
  padding: 26px 34px;
}

.trust-strip div:first-child {
  border-left: 0;
}

.trust-strip strong {
  margin-bottom: 10px;
  color: var(--gold-soft);
  font-family:
    "Noto Serif SC",
    "Source Han Serif SC",
    "Songti SC",
    serif;
  font-size: clamp(30px, 4vw, 54px);
  font-weight: 700;
}

.trust-strip span {
  color: rgba(255, 255, 255, 0.72);
  font-size: 15px;
}

.intro,
.scenarios,
.services,
.audience,
.method,
.deliverables,
.principles,
.contact {
  padding: clamp(74px, 9vw, 124px) clamp(22px, 5vw, 72px);
}

.intro-grid,
.audience-grid {
  display: grid;
  grid-template-columns: minmax(300px, 0.95fr) minmax(300px, 1.05fr);
  gap: clamp(34px, 6vw, 86px);
}

h2 {
  margin-bottom: 0;
  color: var(--navy);
  font-family:
    "Noto Serif SC",
    "Source Han Serif SC",
    "Songti SC",
    serif;
  font-size: clamp(34px, 5.2vw, 74px);
  line-height: 1.12;
  font-weight: 700;
}

.intro-copy {
  display: grid;
  gap: 18px;
}

.intro-copy p {
  margin-bottom: 0;
}

.scenarios {
  background: #fbfaf7;
  border-top: 1px solid var(--line);
}

.section-heading.split {
  max-width: none;
  display: grid;
  grid-template-columns: minmax(320px, 1fr) minmax(300px, 520px);
  gap: clamp(30px, 5vw, 70px);
  align-items: end;
}

.section-heading.split > p {
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.82;
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.scenario-grid article {
  min-height: 250px;
  padding: clamp(24px, 3vw, 34px);
  background: var(--white);
}

.scenario-grid span,
.service-feature span,
.service-list span {
  display: inline-block;
  margin-bottom: 16px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 850;
}

.scenario-grid h3,
.audience-list h3 {
  margin-bottom: 14px;
  color: var(--navy);
  font-family:
    "Noto Serif SC",
    "Source Han Serif SC",
    "Songti SC",
    serif;
  font-size: clamp(23px, 2.4vw, 32px);
  line-height: 1.18;
}

.scenario-grid p,
.audience-list p,
.principles p {
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.8;
}

.services {
  background: var(--paper-deep);
}

.section-heading {
  max-width: 900px;
  margin-bottom: 48px;
}

.service-layout {
  display: grid;
  grid-template-columns: minmax(320px, 1.08fr) minmax(320px, 0.92fr);
  gap: 22px;
  align-items: stretch;
}

.service-feature,
.service-list article {
  background: var(--white);
  border: 1px solid rgba(30, 35, 41, 0.1);
  box-shadow: 0 18px 52px rgba(32, 35, 38, 0.08);
}

.service-feature {
  display: grid;
  grid-template-rows: minmax(320px, 0.9fr) auto;
}

.service-feature > div {
  padding: clamp(26px, 4vw, 42px);
}

.service-feature h3,
.service-list h3 {
  margin-bottom: 14px;
  color: var(--navy);
  font-family:
    "Noto Serif SC",
    "Source Han Serif SC",
    "Songti SC",
    serif;
  font-size: clamp(25px, 3vw, 40px);
  line-height: 1.16;
}

.service-feature p,
.service-list p {
  margin-bottom: 0;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 0;
  margin: 24px 0 0;
  list-style: none;
}

.tag-list li {
  padding: 8px 12px;
  color: var(--navy);
  background: rgba(177, 138, 87, 0.13);
  border: 1px solid rgba(177, 138, 87, 0.22);
  font-size: 13px;
  font-weight: 750;
}

.service-list {
  display: grid;
  gap: 18px;
}

.service-list article {
  padding: clamp(24px, 3vw, 34px);
}

.audience {
  background: var(--navy);
  color: var(--white);
}

.audience h2 {
  color: var(--white);
}

.audience .section-kicker {
  color: var(--gold-soft);
}

.audience-list {
  display: grid;
  gap: 16px;
}

.audience-list article {
  padding: 28px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
}

.audience-list h3 {
  color: var(--gold-soft);
}

.audience-list p {
  color: rgba(255, 255, 255, 0.74);
}

.method {
  display: grid;
  grid-template-columns: minmax(320px, 0.95fr) minmax(320px, 1.05fr);
  gap: clamp(34px, 6vw, 86px);
  align-items: center;
  background: #fbfaf7;
}

.method-visual {
  min-height: 560px;
  overflow: hidden;
  background: var(--navy);
  box-shadow: var(--shadow);
}

.method-copy h2 {
  margin-bottom: 36px;
}

.method-steps {
  display: grid;
  border-top: 1px solid var(--line);
}

.method-steps div {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 22px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.method-steps strong {
  color: var(--wine);
  font-size: 18px;
}

.method-steps p {
  margin-bottom: 0;
}

.deliverables {
  background: var(--paper-deep);
}

.deliverable-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: rgba(23, 38, 58, 0.18);
  border: 1px solid rgba(23, 38, 58, 0.18);
}

.deliverable-list div {
  min-height: 116px;
  display: flex;
  align-items: center;
  padding: 26px;
  color: var(--navy);
  background: var(--white);
  font-size: 19px;
  font-weight: 760;
}

.principles {
  background:
    linear-gradient(90deg, rgba(23, 38, 58, 0.92), rgba(23, 38, 58, 0.82)),
    var(--navy);
  color: var(--white);
}

.principles h2 {
  max-width: 980px;
  margin-bottom: 24px;
  color: var(--white);
}

.principles p {
  max-width: 860px;
  color: rgba(255, 255, 255, 0.74);
  font-size: 18px;
}

.principles .section-kicker {
  color: var(--gold-soft);
}

.contact {
  display: grid;
  grid-template-columns: minmax(320px, 1fr) minmax(300px, 430px);
  gap: clamp(34px, 6vw, 86px);
  align-items: center;
  background: var(--navy);
  color: var(--white);
}

.contact h2 {
  margin-bottom: 22px;
  color: var(--white);
}

.contact p {
  max-width: 760px;
  color: rgba(255, 255, 255, 0.74);
}

.contact .section-kicker {
  color: var(--gold-soft);
}

.contact-panel {
  display: grid;
  gap: 12px;
}

.contact-panel a {
  display: block;
  padding: 24px;
  color: var(--white);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
}

.contact-panel span,
.contact-panel strong {
  display: block;
}

.contact-panel span {
  margin-bottom: 8px;
  color: rgba(255, 255, 255, 0.62);
  font-size: 13px;
}

.contact-panel strong {
  color: var(--gold-soft);
  font-size: 20px;
}

@media (max-width: 920px) {
  .site-header {
    height: 70px;
  }

  .desktop-nav {
    display: none;
  }

  .menu-button {
    display: block;
  }

  .mobile-nav {
    position: fixed;
    top: 70px;
    right: 0;
    left: 0;
    z-index: 25;
    display: grid;
    max-height: 0;
    overflow: hidden;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    transition: max-height 0.24s ease;
  }

  .mobile-nav.open {
    max-height: 260px;
  }

  .mobile-nav a {
    padding: 18px 22px;
    border-top: 1px solid var(--line);
    color: var(--navy);
    font-weight: 750;
  }

  .hero,
  .intro-grid,
  .audience-grid,
  .service-layout,
  .method,
  .section-heading.split,
  .contact {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 48px;
  }

  .hero-visual,
  .method-visual {
    min-height: 420px;
  }

  .trust-strip {
    grid-template-columns: 1fr;
    padding: 0;
  }

  .scenario-grid,
  .deliverable-list {
    grid-template-columns: 1fr;
  }

  .trust-strip div,
  .trust-strip div:first-child {
    min-height: 116px;
    border-left: 0;
    border-top: 1px solid rgba(255, 255, 255, 0.16);
    padding: 24px;
  }
}

@media (max-width: 540px) {
  .brand small {
    display: none;
  }

  h1 {
    font-size: 54px;
  }

  .hero-title {
    font-size: 30px;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .button-primary,
  .button-secondary {
    width: 100%;
  }

  .hero-visual,
  .method-visual {
    min-height: 320px;
  }

  .hero-note {
    right: 16px;
    bottom: 16px;
    width: calc(100% - 32px);
  }

  .method-steps div {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .scenario-grid article {
    min-height: auto;
  }
}