:root {
  --bg: #f6f5f1;
  --paper: #ffffff;
  --ink: #171717;
  --muted: #77736d;
  --line: #e6e2da;
  --gold: #b4945b;
  --gold-dark: #8d6d39;
  --dark: #171717;
  --radius: 18px;
  --shadow: 0 18px 60px rgba(24, 24, 24, 0.1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  color: var(--ink);
  background: var(--bg);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  line-height: 1.7;
}

img {
  display: block;
  width: 100%;
  object-fit: cover;
}

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

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

.container {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  width: 100%;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(18, 18, 18, 0.82);
  backdrop-filter: blur(18px);
  color: #fff;
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 78px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  line-height: 1.2;
}

.logo-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border: 1px solid var(--gold);
  border-radius: 50%;
  color: var(--gold);
  font-family: Georgia, serif;
  font-size: 22px;
  font-style: italic;
}

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

.logo strong {
  font-size: 16px;
  letter-spacing: 1px;
}

.logo small {
  margin-top: 4px;
  color: #b9b9b9;
  font-size: 10px;
  letter-spacing: 2px;
}

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

.main-nav a {
  color: #e6e6e6;
  transition: color 0.25s ease;
}

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

.nav-button {
  padding: 10px 18px;
  border: 1px solid var(--gold);
  color: #fff !important;
}

.menu-toggle {
  display: none;
  border: 0;
  background: transparent;
}

.menu-toggle span {
  display: block;
  width: 25px;
  height: 2px;
  margin: 5px 0;
  background: #fff;
}

.hero {
  position: relative;
  min-height: 760px;
  display: flex;
  align-items: center;
  color: #fff;
  background:
    url("https://images.unsplash.com/photo-1493238792000-8113da705763?auto=format&fit=crop&w=2000&q=90")
    center / cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(10, 10, 10, 0.9), rgba(10, 10, 10, 0.3));
}

.hero-content {
  position: relative;
  z-index: 1;
  padding-top: 70px;
}

.eyebrow {
  margin-bottom: 15px;
  color: var(--gold);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 700px;
  font-family: Georgia, "Microsoft YaHei", serif;
  font-size: clamp(48px, 7vw, 88px);
  font-weight: 400;
  line-height: 1.13;
  letter-spacing: -2px;
}

.hero h1 span {
  color: #d6b477;
}

.hero-text {
  max-width: 560px;
  margin: 28px 0;
  color: #d5d5d5;
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 13px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-size: 14px;
  font-weight: 700;
  transition: all 0.25s ease;
}

.button-primary {
  background: var(--gold);
  color: #fff;
}

.button-primary:hover {
  background: var(--gold-dark);
}

.button-light {
  border-color: rgba(255, 255, 255, 0.65);
  color: #fff;
}

.button-light:hover {
  border-color: #fff;
  background: #fff;
  color: #222;
}

.button-dark {
  background: var(--dark);
  color: #fff;
}

.button-dark:hover {
  background: var(--gold-dark);
}

.hero-number {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: 80px;
}

.hero-number span {
  color: var(--gold);
  font-size: 24px;
  letter-spacing: 2px;
}

.hero-number small {
  color: #aaa;
}

.trust-section {
  background: var(--dark);
  color: #fff;
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  min-height: 150px;
  align-items: center;
}

.trust-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  border-right: 1px solid #373737;
}

.trust-item:last-child {
  border: 0;
}

.trust-item strong {
  color: var(--gold);
  font-family: Georgia, serif;
  font-size: 36px;
  font-weight: 400;
}

.trust-item span {
  color: #aaa;
  font-size: 13px;
}

.section {
  padding: 110px 0;
}

.intro-grid,
.material-grid,
.about-grid,
.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

h2 {
  font-family: Georgia, "Microsoft YaHei", serif;
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 400;
  line-height: 1.25;
}

.section-desc {
  margin: 24px 0;
  color: var(--muted);
  font-size: 16px;
}

.check-list {
  display: grid;
  gap: 12px;
  margin: 28px 0;
  color: #3d3b38;
  font-size: 15px;
}

.text-link {
  color: var(--gold-dark);
  font-size: 14px;
  font-weight: 700;
}

.intro-image,
.material-image,
.about-image {
  position: relative;
}

.intro-image img,
.material-image img,
.about-image img {
  height: 530px;
  border-radius: var(--radius);
}

.image-card {
  position: absolute;
  right: -25px;
  bottom: 28px;
  max-width: 260px;
  padding: 22px;
  background: #fff;
  box-shadow: var(--shadow);
}

.image-card strong,
.image-card span {
  display: block;
}

.image-card strong {
  margin-bottom: 5px;
  font-size: 18px;
}

.image-card span {
  color: var(--muted);
  font-size: 13px;
}

.services-section {
  background: #ebe8e0;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  align-items: end;
  margin-bottom: 45px;
}

.section-heading > p {
  max-width: 360px;
  color: var(--muted);
  font-size: 14px;
}

.section-heading.center {
  display: block;
  text-align: center;
}

.section-heading.center > p {
  max-width: 600px;
  margin: 15px auto 0;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 17px;
}

.service-card {
  min-height: 410px;
  padding: 30px 25px;
  background: #fff;
  border: 1px solid transparent;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow);
}

.service-card.featured {
  border-color: var(--gold);
}

.service-icon {
  margin-bottom: 45px;
  color: var(--gold);
  font-family: Georgia, serif;
  font-size: 26px;
}

.service-card h3 {
  margin-bottom: 15px;
  font-size: 21px;
}

.service-card p {
  min-height: 122px;
  color: var(--muted);
  font-size: 13px;
}

.service-card ul {
  padding-top: 20px;
  border-top: 1px solid var(--line);
  list-style: none;
  color: #484641;
  font-size: 13px;
}

.service-card li {
  margin: 6px 0;
}

.service-card li::before {
  margin-right: 7px;
  color: var(--gold);
  content: "•";
}

.material-section {
  background: #fff;
}

.material-content > p:not(.eyebrow) {
  margin: 25px 0;
  color: var(--muted);
}

.material-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-bottom: 30px;
}

.material-tags span {
  padding: 8px 13px;
  border: 1px solid var(--line);
  color: #57534c;
  font-size: 13px;
}

.cases-section {
  background: var(--bg);
}

.case-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  grid-auto-rows: 280px;
  gap: 16px;
}

.case-card {
  position: relative;
  overflow: hidden;
  border-radius: 8px;
  background: #222;
}

.case-card.case-large {
  grid-row: span 2;
}

.case-card img {
  height: 100%;
  transition: transform 0.5s ease;
}

.case-card:hover img {
  transform: scale(1.06);
}

.case-info {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  padding: 30px 24px 22px;
  color: #fff;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.9));
}

.case-info span {
  color: #d7b777;
  font-size: 12px;
}

.case-info h3 {
  margin-top: 5px;
  font-size: 18px;
}

.process-section {
  background: #fff;
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.process-item {
  position: relative;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.process-item span {
  color: var(--gold);
  font-family: Georgia, serif;
  font-size: 28px;
}

.process-item h3 {
  margin: 15px 0 7px;
  font-size: 19px;
}

.process-item p {
  color: var(--muted);
  font-size: 13px;
}

.article-section {
  background: #ebe8e0;
}

.article-heading {
  align-items: center;
}

.article-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 26px;
}

.article-toolbar input {
  width: min(420px, 100%);
  padding: 13px 16px;
  border: 1px solid var(--line);
  outline: none;
  background: #fff;
}

.article-toolbar span {
  align-self: center;
  color: var(--muted);
  font-size: 13px;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.article-card {
  overflow: hidden;
  background: #fff;
}

.article-card img {
  height: 210px;
}

.article-card-content {
  padding: 22px;
}

.article-meta {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  color: var(--gold-dark);
  font-size: 12px;
}

.article-card h3 {
  margin-bottom: 10px;
  font-size: 20px;
  line-height: 1.4;
}

.article-card p {
  display: -webkit-box;
  overflow: hidden;
  color: var(--muted);
  font-size: 13px;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

.empty-state {
  grid-column: 1 / -1;
  padding: 50px;
  text-align: center;
  color: var(--muted);
  background: #fff;
}

.faq-section {
  background: #fff;
}

.faq-list {
  border-top: 1px solid var(--line);
}

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-question {
  display: flex;
  width: 100%;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  border: 0;
  background: transparent;
  text-align: left;
  font-weight: 700;
}

.faq-question span {
  color: var(--gold);
  font-size: 25px;
  font-weight: 300;
}

.faq-answer {
  display: none;
  padding: 0 35px 20px 0;
  color: var(--muted);
  font-size: 14px;
}

.faq-item.active .faq-answer {
  display: block;
}

.faq-item.active .faq-question span {
  transform: rotate(45deg);
}

.about-section {
  background: #ebe8e0;
}

.about-content > p:not(.eyebrow) {
  margin-top: 20px;
  color: var(--muted);
}

.about-image img {
  height: 500px;
}

.about-points {
  display: grid;
  gap: 13px;
  margin-top: 30px;
}

.about-points div {
  display: flex;
  flex-direction: column;
  padding-left: 18px;
  border-left: 2px solid var(--gold);
}

.about-points strong {
  font-size: 15px;
}

.about-points span {
  color: var(--muted);
  font-size: 13px;
}

.contact-section {
  padding: 70px 0;
  background: var(--dark);
  color: #fff;
}

.contact-box {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  align-items: center;
}

.contact-box h2 {
  margin-bottom: 12px;
}

.contact-box p:not(.eyebrow) {
  color: #aaa;
}

.contact-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
}

.contact-phone {
  color: var(--gold);
  font-size: 21px;
  letter-spacing: 1px;
}

.site-footer {
  padding-top: 60px;
  background: #111;
  color: #fff;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1.4fr;
  gap: 60px;
  padding-bottom: 55px;
}

.footer-logo {
  margin-bottom: 20px;
}

.footer-desc,
.site-footer p {
  color: #8d8d8d;
  font-size: 13px;
}

.site-footer h3 {
  margin-bottom: 15px;
  color: #fff;
  font-size: 15px;
}

.site-footer a:not(.logo) {
  display: block;
  margin: 7px 0;
  color: #999;
  font-size: 13px;
}

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

.footer-bottom {
  padding: 18px 0;
  border-top: 1px solid #2b2b2b;
  color: #666;
  font-size: 12px;
}

.modal {
  position: fixed;
  z-index: 50;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal.show {
  display: flex;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.72);
}

.modal-content {
  position: relative;
  z-index: 1;
  width: min(620px, 100%);
  max-height: 90vh;
  overflow-y: auto;
  padding: 35px;
  background: #fff;
}

.modal-close {
  position: absolute;
  top: 17px;
  right: 20px;
  border: 0;
  background: transparent;
  color: #777;
  font-size: 30px;
  line-height: 1;
}

.modal-content h2 {
  margin-bottom: 25px;
  font-size: 34px;
}

.modal-content label {
  display: block;
  margin-bottom: 16px;
  color: #45423e;
  font-size: 13px;
  font-weight: 700;
}

.modal-content input,
.modal-content select,
.modal-content textarea {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 12px 13px;
  border: 1px solid var(--line);
  outline: none;
  resize: vertical;
}

.modal-content input:focus,
.modal-content select:focus,
.modal-content textarea:focus {
  border-color: var(--gold);
}

.full-button {
  width: 100%;
  border: 0;
}

.form-tip {
  margin-top: 13px;
  color: var(--muted);
  font-size: 12px;
}

.floating-phone {
  position: fixed;
  z-index: 15;
  right: 24px;
  bottom: 24px;
  display: grid;
  width: 52px;
  height: 52px;
  place-items: center;
  border: 0;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: var(--shadow);
  color: #fff;
  font-size: 23px;
}

@media (max-width: 900px) {
  .main-nav {
    gap: 14px;
    font-size: 12px;
  }

  .service-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .article-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .intro-grid,
  .material-grid,
  .about-grid,
  .faq-grid {
    gap: 45px;
  }
}

@media (max-width: 700px) {
  .container {
    width: min(100% - 30px, 560px);
  }

  .nav-wrap {
    min-height: 68px;
  }

  .menu-toggle {
    display: block;
  }

  .main-nav {
    position: absolute;
    top: 68px;
    right: 15px;
    left: 15px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px;
    background: #1b1b1b;
  }

  .main-nav.show {
    display: flex;
  }

  .main-nav a {
    padding: 12px;
    border-bottom: 1px solid #333;
  }

  .main-nav .nav-button {
    margin-top: 7px;
    text-align: center;
  }

  .hero {
    min-height: 700px;
  }

  .hero h1 {
    font-size: 50px;
  }

  .hero-text {
    font-size: 15px;
  }

  .hero-number {
    margin-top: 55px;
  }

  .trust-grid {
    grid-template-columns: repeat(2, 1fr);
    padding: 15px 0;
  }

  .trust-item {
    min-height: 80px;
    border-bottom: 1px solid #373737;
  }

  .section {
    padding: 75px 0;
  }

  .intro-grid,
  .material-grid,
  .about-grid,
  .faq-grid {
    grid-template-columns: 1fr;
  }

  .intro-image img,
  .material-image img,
  .about-image img {
    height: 360px;
  }

  .image-card {
    right: 15px;
  }

  .service-grid,
  .article-grid {
    grid-template-columns: 1fr;
  }

  .service-card {
    min-height: auto;
  }

  .service-card p {
    min-height: auto;
    margin-bottom: 20px;
  }

  .section-heading,
  .contact-box {
    display: block;
  }

  .section-heading > p {
    margin-top: 15px;
  }

  .article-heading .button {
    margin-top: 20px;
  }

  .case-grid {
    display: grid;
    grid-template-columns: 1fr;
    grid-auto-rows: 260px;
  }

  .case-card.case-large {
    grid-row: auto;
  }

  .process-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 25px 18px;
  }

  .contact-actions {
    align-items: flex-start;
    margin-top: 28px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .modal-content {
    padding: 27px 20px;
  }
}