/* Mobile-first · 中国传统文化风 */
:root {
  --ink: #1a1208;
  --ink-soft: #3d2914;
  --paper: #f7f2ea;
  --paper-deep: #ebe3d4;
  --vermilion: #8b1a1a;
  --vermilion-hover: #a52222;
  --gold: #b8860b;
  --gold-light: #d4a84b;
  --mist: rgba(26, 18, 8, 0.06);
  --shadow: 0 12px 40px rgba(26, 18, 8, 0.08);
  --radius: 4px;
  --font-serif: "Songti SC", "STSong", "SimSun", "Noto Serif SC", serif;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --header-h: 64px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink-soft);
  background: var(--paper);
}

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

a {
  color: var(--vermilion);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

.container {
  width: min(1120px, 100% - 2rem);
  margin-inline: auto;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(247, 242, 234, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--mist);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.12em;
}

.logo span {
  color: var(--vermilion);
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  border: none;
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-nav {
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  background: var(--paper);
  border-bottom: 1px solid var(--mist);
  padding: 1rem 0 1.25rem;
  transform: translateY(-120%);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.site-nav.is-open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  text-align: center;
}

.site-nav li + li {
  margin-top: 0.75rem;
}

.site-nav a {
  color: var(--ink-soft);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
}

.site-nav a:hover {
  color: var(--vermilion);
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    transform: none;
    opacity: 1;
    pointer-events: auto;
    border: none;
    padding: 0;
    background: transparent;
  }

  .site-nav ul {
    display: flex;
    gap: 2rem;
    text-align: left;
  }

  .site-nav li + li {
    margin-top: 0;
  }
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-h) + 2rem) 0 4rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(247, 242, 234, 0.75) 0%,
    rgba(247, 242, 234, 0.55) 45%,
    rgba(247, 242, 234, 0.92) 100%
  );
}

.hero-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.4;
  background-image: url("pattern.svg");
  background-size: 120px 120px;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero-seal {
  display: inline-block;
  width: 48px;
  height: 48px;
  line-height: 48px;
  margin-bottom: 1.25rem;
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--paper);
  background: var(--vermilion);
  border-radius: 2px;
  box-shadow: inset 0 0 0 2px var(--gold-light);
}

.hero h1 {
  margin: 0 0 1rem;
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.06em;
  line-height: 1.35;
}

.hero-tagline {
  margin: 0 auto 0.75rem;
  max-width: 28em;
  font-size: 1.05rem;
  color: var(--ink-soft);
}

.hero-sub {
  margin: 0 auto 2rem;
  max-width: 32em;
  font-size: 0.95rem;
  color: rgba(61, 41, 20, 0.75);
}

.btn {
  display: inline-block;
  padding: 0.85rem 2rem;
  font-size: 0.95rem;
  letter-spacing: 0.15em;
  border-radius: var(--radius);
  border: 1px solid var(--vermilion);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, transform 0.15s ease;
}

.btn-primary {
  color: var(--paper);
  background: var(--vermilion);
}

.btn-primary:hover {
  background: var(--vermilion-hover);
  color: var(--paper);
  transform: translateY(-1px);
}

.btn-outline {
  color: var(--vermilion);
  background: transparent;
  margin-left: 0;
  margin-top: 0.75rem;
}

.btn-outline:hover {
  background: rgba(139, 26, 26, 0.06);
  color: var(--vermilion);
}

@media (min-width: 480px) {
  .btn-outline {
    margin-left: 1rem;
    margin-top: 0;
  }
}

/* Sections */
.section {
  padding: 4rem 0;
  position: relative;
}

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

.section-head {
  text-align: center;
  margin-bottom: 2.5rem;
}

.section-label {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 0.85rem;
  letter-spacing: 0.3em;
  color: var(--gold);
  margin-bottom: 0.5rem;
}

.section-head h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  color: var(--ink);
  letter-spacing: 0.08em;
}

.section-head .divider {
  width: 48px;
  height: 2px;
  margin: 1rem auto 0;
  background: linear-gradient(90deg, transparent, var(--vermilion), transparent);
}

/* About */
.about-text {
  max-width: 42em;
  margin: 0 auto;
  text-align: center;
  font-size: 1rem;
  color: var(--ink-soft);
}

.about-text p + p {
  margin-top: 1rem;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 2.5rem;
}

.stat-card {
  padding: 1.25rem;
  text-align: center;
  background: var(--paper);
  border: 1px solid var(--mist);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.section-alt .stat-card {
  background: #faf6ef;
}

.stat-card strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.35rem;
  color: var(--vermilion);
  margin-bottom: 0.25rem;
}

.stat-card span {
  font-size: 0.875rem;
  color: rgba(61, 41, 20, 0.7);
}

@media (min-width: 600px) {
  .about-stats {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Services */
.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.service-card {
  padding: 1.75rem 1.5rem;
  background: var(--paper);
  border: 1px solid var(--mist);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.section-alt .service-card {
  background: #faf6ef;
}

.service-card:hover {
  transform: translateY(-3px);
  border-color: rgba(184, 134, 11, 0.35);
}

.service-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 1rem;
  font-family: var(--font-serif);
  font-size: 1.25rem;
  line-height: 40px;
  text-align: center;
  color: var(--gold);
  border: 1px solid rgba(184, 134, 11, 0.4);
  border-radius: 50%;
}

.service-card h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--ink);
  letter-spacing: 0.04em;
}

.service-card .subtitle {
  margin: 0 0 0.75rem;
  font-size: 0.875rem;
  color: var(--gold);
  letter-spacing: 0.06em;
}

.service-card p {
  margin: 0;
  font-size: 0.925rem;
  color: rgba(61, 41, 20, 0.85);
}

@media (min-width: 640px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .service-card--wide {
    grid-column: span 2;
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 1.25rem;
    align-items: start;
  }

  .service-card--wide .service-icon {
    margin-bottom: 0;
  }
}

/* Advantages */
.advantages {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.advantage-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.advantage-num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  line-height: 36px;
  text-align: center;
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--vermilion);
  border: 1px solid rgba(139, 26, 26, 0.35);
  border-radius: 50%;
}

.advantage-item h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  color: var(--ink);
}

.advantage-item p {
  margin: 0;
  font-size: 0.925rem;
}

@media (min-width: 768px) {
  .advantages {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }

  .advantage-item {
    flex-direction: column;
    text-align: center;
    align-items: center;
  }
}

/* Contact strip */
.contact-strip {
  text-align: center;
  padding: 2.5rem 0;
  border-top: 1px solid var(--mist);
}

.contact-strip p {
  margin: 0.35rem 0;
  font-size: 0.925rem;
}

/* Footer */
.site-footer {
  padding: 2rem 0 2.5rem;
  background: var(--ink);
  color: rgba(247, 242, 234, 0.75);
  text-align: center;
  font-size: 0.875rem;
}

.footer-brand {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--paper);
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

.footer-meta {
  margin-bottom: 1.25rem;
  line-height: 1.8;
}

.footer-meta a {
  color: rgba(212, 168, 75, 0.9);
}

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

.footer-icp {
  display: block;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(247, 242, 234, 0.12);
  text-align: center;
}

.footer-icp a {
  color: rgba(247, 242, 234, 0.85);
  font-size: 0.875rem;
  letter-spacing: 0.04em;
}

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

.footer-copy {
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: rgba(247, 242, 234, 0.45);
}