:root {
  --ink: #202020;
  --soft-ink: #55514c;
  --muted: #8a8580;
  --paper: #f1f1ef;
  --white: #ffffff;
  --line: rgba(32, 32, 32, 0.14);
  --deep: #111111;
  --shadow: 0 28px 70px rgba(0, 0, 0, 0.12);
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--paper);
  font-family: "HarmonyOS Sans SC", "Microsoft YaHei UI", "PingFang SC", sans-serif;
  font-size: 15px;
  line-height: 1.8;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
h1, h2, h3, p { margin: 0; }
h1, h2, h3, .brand-word, .section-title {
  font-family: "Source Han Serif SC", "Noto Serif CJK SC", "SimSun", serif;
  font-weight: 500;
  letter-spacing: 0;
}

.site-header {
  position: fixed;
  z-index: 30;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 7vw;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  color: var(--white);
  background: var(--deep);
  font-family: "Source Han Serif SC", serif;
}

nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14px;
  font-weight: 600;
}

nav a { color: #2d2d2d; }
nav a:hover { color: #000; }

.hero-media {
  position: relative;
  min-height: 100vh;
  margin-top: 80px;
  overflow: hidden;
  background: var(--deep);
}

.hero-visual,
.image-frame,
.product-image,
.case-image {
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
}

.hero-visual {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, rgba(0, 0, 0, 0.62), rgba(0, 0, 0, 0.14) 54%, rgba(0, 0, 0, 0.25)),
    url("/assets/main-wall-strip.jpg");
  transform: scale(1.02);
}

.hero-copy {
  position: relative;
  z-index: 2;
  width: min(760px, 86vw);
  padding: 17vh 7vw 10vh;
  color: var(--white);
}

.section-kicker {
  color: rgba(255, 255, 255, 0.76);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
}

.hero-copy h1 {
  margin-top: 24px;
  font-size: clamp(42px, 6.4vw, 82px);
  line-height: 1.12;
}

.hero-copy p:not(.section-kicker) {
  max-width: 620px;
  margin-top: 28px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 18px;
}

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

.line-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 118px;
  height: 42px;
  padding: 0 22px;
  border: 1px solid var(--ink);
  color: var(--ink);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.line-button.light {
  border-color: rgba(255, 255, 255, 0.72);
  color: var(--white);
}

.line-button.dark {
  color: var(--white);
  background: var(--deep);
}

.section-band {
  width: min(var(--max), 86vw);
  margin: 120px auto;
}

.section-title {
  margin-bottom: 42px;
  font-size: clamp(42px, 7vw, 94px);
  line-height: 1;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr .82fr;
  gap: 54px;
  align-items: center;
}

.image-frame {
  min-height: 520px;
  box-shadow: var(--shadow);
}

.image-warm {
  background-image: url("/assets/main-wall-strip.jpg");
  background-position: left center;
}

.image-detail {
  min-height: 360px;
  background-image: url("/assets/material-strip.jpg");
  background-position: right center;
}

.image-stack {
  display: grid;
  gap: 28px;
  justify-items: start;
}

.about-copy {
  display: grid;
  gap: 22px;
}

.brand-word {
  font-size: clamp(58px, 8vw, 120px);
  line-height: .9;
}

.about-copy h2,
.contact-section h2 {
  max-width: 640px;
  font-size: clamp(32px, 4vw, 54px);
  line-height: 1.24;
}

.about-copy p,
.product-text p,
.case-card p,
.method-grid p,
.contact-section p {
  color: var(--soft-ink);
}

.product-feature {
  position: relative;
  min-height: 680px;
  display: grid;
  align-items: center;
  width: 100%;
  margin: 130px 0;
  padding: 0 7vw;
}

.product-feature .section-kicker {
  color: var(--muted);
}

.product-text {
  position: relative;
  z-index: 2;
  width: min(430px, 82vw);
  display: grid;
  gap: 22px;
  padding: 42px 0;
}

.product-text h2 {
  font-size: clamp(50px, 8vw, 120px);
  line-height: .94;
}

.product-image {
  position: absolute;
  top: 0;
  bottom: 0;
  width: min(68vw, 980px);
  box-shadow: var(--shadow);
}

.product-one .product-image,
.product-three .product-image {
  right: 0;
}

.product-two {
  justify-items: end;
}

.product-two .product-image {
  left: 0;
}

.image-cabinet {
  background-image: url("/assets/main-wall-strip.jpg");
}

.image-kitchen {
  background-image: url("/assets/material-strip.jpg");
  background-position: left center;
}

.image-doorwall {
  background-image: url("/assets/material-strip.jpg");
  background-position: right center;
}

.case-section {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 64px;
  align-items: start;
}

.case-menu {
  position: sticky;
  top: 110px;
}

.case-tabs {
  display: grid;
  gap: 14px;
  margin: 26px 0 34px;
  color: var(--soft-ink);
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}

.case-card {
  display: grid;
  gap: 16px;
}

.case-image {
  min-height: 420px;
  background-color: #ddd;
}

.image-bedroom {
  background-image: url("/assets/main-wall-strip.jpg");
}

.image-storage {
  background-image: url("/assets/material-strip.jpg");
}

.case-card h3,
.method-grid h3 {
  font-size: 26px;
  line-height: 1.34;
}

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

.method-grid article {
  min-height: 270px;
  display: grid;
  align-content: end;
  gap: 18px;
  padding: 34px;
  background: var(--paper);
}

.method-grid span {
  color: var(--muted);
  font-weight: 700;
}

.contact-section {
  width: min(900px, 86vw);
  margin: 150px auto 120px;
  text-align: center;
}

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

.contact-section h2 {
  margin: 18px auto 24px;
}

.contact-section p {
  max-width: 680px;
  margin: 0 auto;
}

.contact-actions {
  justify-content: center;
}

.system-status {
  margin-top: 24px !important;
  color: var(--muted) !important;
  font-size: 13px;
}

footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 38px 7vw;
  color: var(--soft-ink);
  border-top: 1px solid var(--line);
  background: var(--white);
}

footer strong {
  color: var(--ink);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
  text-align: right;
}

.policy {
  width: min(880px, 86vw);
  margin: 0 auto;
  padding: 170px 0 120px;
}

.policy .eyebrow {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
}

.policy h1 {
  margin: 18px 0 20px;
  font-size: clamp(42px, 6vw, 76px);
}

.policy h2 {
  margin: 0 0 14px;
  font-size: 28px;
}

.policy p {
  color: var(--soft-ink);
}

.policy section {
  padding: 30px 0;
  border-top: 1px solid var(--line);
}

.updated {
  margin-bottom: 46px;
}

@media (max-width: 980px) {
  .site-header {
    padding: 0 24px;
  }

  nav {
    gap: 16px;
    font-size: 13px;
  }

  .about-grid,
  .case-section,
  .case-grid,
  .method-grid {
    grid-template-columns: 1fr;
  }

  .case-menu {
    position: static;
  }

  .product-feature {
    min-height: auto;
    gap: 28px;
    padding: 0 24px;
  }

  .product-image {
    position: relative;
    width: 100%;
    min-height: 520px;
    order: -1;
  }

  .product-two {
    justify-items: start;
  }
}

@media (max-width: 700px) {
  body {
    font-size: 14px;
  }

  .site-header {
    height: 68px;
  }

  nav {
    display: none;
  }

  .hero-media {
    min-height: 720px;
    margin-top: 68px;
  }

  .hero-copy {
    width: 100%;
    padding: 110px 22px 70px;
  }

  .hero-copy h1 {
    font-size: 42px;
    word-break: keep-all;
    overflow-wrap: anywhere;
  }

  .hero-copy p:not(.section-kicker) {
    font-size: 16px;
  }

  .section-band {
    width: calc(100% - 44px);
    margin: 78px auto;
  }

  .section-title {
    font-size: 54px;
  }

  .image-frame,
  .product-image,
  .case-image {
    min-height: 360px;
  }

  .about-grid {
    gap: 28px;
  }

  .product-feature {
    margin: 80px 0;
  }

  .product-text h2 {
    font-size: 56px;
  }

  .method-grid article {
    min-height: 220px;
  }

  footer {
    flex-direction: column;
    align-items: flex-start;
    padding: 30px 22px;
  }

  .footer-links {
    text-align: left;
  }
}