/* Mobile-first · 极简文化风 */
:root {
  --color-bg: #f7f4ef;
  --color-bg-alt: #efe9df;
  --color-surface: #fffcf8;
  --color-ink: #1c1917;
  --color-ink-muted: #57534e;
  --color-accent: #8b5a2b;
  --color-accent-soft: #c4a574;
  --color-border: rgba(28, 25, 23, 0.1);
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-serif: "Songti SC", "STSong", "SimSun", serif;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --radius: 4px;
  --header-h: 3.5rem;
  --max-width: 72rem;
  --transition: 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-ink);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(247, 244, 239, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--color-ink);
  font-weight: 600;
  letter-spacing: 0.08em;
}

.logo:hover {
  color: var(--color-accent);
}

.logo-mark {
  width: 1.75rem;
  height: 1.75rem;
  flex-shrink: 0;
  display: block;
}

.logo:hover .logo-mark {
  opacity: 0.88;
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 1.25rem;
  height: 2px;
  margin: 0 auto;
  background: var(--color-ink);
  transition: transform var(--transition), opacity var(--transition);
}

.site-nav {
  display: none;
  position: absolute;
  top: var(--header-h);
  left: 0;
  right: 0;
  flex-direction: column;
  gap: 0;
  padding: var(--space-sm) var(--space-md) var(--space-md);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 8px 24px rgba(28, 25, 23, 0.06);
}

.site-nav.is-open {
  display: flex;
}

.site-nav a {
  padding: 0.75rem 0;
  color: var(--color-ink-muted);
  font-size: 0.95rem;
  border-bottom: 1px solid var(--color-border);
}

.site-nav a:last-child {
  border-bottom: none;
}

.site-nav a:hover,
.site-nav .nav-cta {
  color: var(--color-accent);
}

.site-header .header-inner {
  position: relative;
}

/* Hero */
.hero {
  position: relative;
  padding: var(--space-xl) 0 calc(var(--space-xl) + 1rem);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(165deg, rgba(247, 244, 239, 0.3) 0%, var(--color-bg) 55%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120' viewBox='0 0 120 120' fill='none'%3E%3Ccircle cx='60' cy='60' r='1.2' fill='%238b5a2b' opacity='0.12'/%3E%3Cpath d='M60 8v16M60 96v16M8 60h16M96 60h16' stroke='%23c4a574' stroke-width='0.4' opacity='0.15'/%3E%3Ccircle cx='60' cy='60' r='28' stroke='%238b5a2b' stroke-width='0.35' opacity='0.08'/%3E%3C/svg%3E") center / 420px repeat;
  opacity: 0.85;
  pointer-events: none;
}

.hero-bg::after {
  content: "";
  position: absolute;
  right: -20%;
  top: 10%;
  width: 55%;
  height: 70%;
  border-radius: 50%;
  background: radial-gradient(ellipse, rgba(196, 165, 116, 0.18), transparent 70%);
}

.hero-inner {
  position: relative;
  max-width: 40rem;
}

.hero-eyebrow {
  margin: 0 0 var(--space-sm);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.hero h1 {
  margin: 0 0 var(--space-md);
  font-family: var(--font-serif);
  font-size: clamp(1.85rem, 6vw, 2.75rem);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: 0.04em;
}

.hero-subtitle {
  margin: 0 0 var(--space-lg);
  font-size: 1.05rem;
  color: var(--color-ink-muted);
  max-width: 36rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background: #6d4622;
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-ink);
}

.btn-outline:hover {
  background: var(--color-ink);
  color: var(--color-bg);
}

/* Sections */
.section {
  padding: var(--space-xl) 0;
}

.section:nth-of-type(even) {
  background: var(--color-surface);
}

.section-header {
  margin-bottom: var(--space-lg);
}

.section-header--center {
  text-align: center;
}

.section-header--center .section-desc {
  margin-left: auto;
  margin-right: auto;
}

.section-label {
  display: block;
  margin-bottom: var(--space-xs);
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-accent-soft);
}

.section-header h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 600;
}

.section-desc {
  margin: var(--space-sm) 0 0;
  max-width: 32rem;
  color: var(--color-ink-muted);
  font-size: 0.95rem;
}

/* About */
.about-grid {
  display: grid;
  gap: var(--space-lg);
}

.about-text p {
  margin: 0 0 var(--space-md);
  color: var(--color-ink-muted);
}

.about-text strong {
  color: var(--color-ink);
  font-weight: 600;
}

.about-stats {
  display: grid;
  gap: var(--space-sm);
}

.stat-card {
  padding: var(--space-md);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.stat-value {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.5rem;
  color: var(--color-accent);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--color-ink-muted);
}

/* Services */
.services-grid {
  display: grid;
  gap: var(--space-md);
}

.service-card {
  padding: var(--space-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.section.services .service-card {
  background: var(--color-surface);
}

.service-card:hover {
  border-color: var(--color-accent-soft);
  box-shadow: 0 4px 20px rgba(139, 90, 43, 0.08);
}

.service-icon {
  width: 2.5rem;
  height: 2.5rem;
  margin-bottom: var(--space-sm);
  color: var(--color-accent);
}

.service-card h3 {
  margin: 0 0 var(--space-xs);
  font-size: 1.1rem;
  font-weight: 600;
}

.service-tagline {
  margin: 0 0 var(--space-sm);
  font-size: 0.9rem;
  color: var(--color-accent);
}

.service-card > p:last-child {
  margin: 0;
  font-size: 0.92rem;
  color: var(--color-ink-muted);
}

.service-card--wide .service-card-body {
  margin-top: 0;
}

/* Advantages */
.advantages-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-md);
}

.advantage-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--color-surface);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.section.advantages .advantage-item {
  background: var(--color-bg);
}

.advantage-num {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--color-accent-soft);
  line-height: 1.2;
}

.advantage-item h3 {
  margin: 0 0 var(--space-xs);
  font-size: 1.05rem;
}

.advantage-item p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--color-ink-muted);
}

/* Contact */
.contact-card {
  max-width: 28rem;
  margin: 0 auto;
  padding: var(--space-lg);
  text-align: center;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.contact-card p {
  margin: 0 0 var(--space-sm);
  color: var(--color-ink-muted);
}

.contact-cta {
  margin-top: var(--space-md) !important;
  font-size: 0.9rem !important;
  line-height: 1.8;
}

/* Footer */
.site-footer {
  padding: var(--space-lg) 0 calc(var(--space-lg) + env(safe-area-inset-bottom));
  background: var(--color-ink);
  color: rgba(255, 252, 248, 0.75);
  text-align: center;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.footer-company,
.footer-scope {
  margin: 0;
  font-size: 0.8rem;
}

.footer-beian {
  margin: 0;
  width: 100%;
  text-align: center;
  padding: var(--space-sm) 0;
}

.footer-beian a {
  color: rgba(255, 252, 248, 0.95);
  font-size: 0.9rem;
  letter-spacing: 0.05em;
}

.footer-beian a:hover {
  color: var(--color-accent-soft);
}

.footer-scope {
  opacity: 0.65;
  max-width: 28rem;
}

/* Tablet+ */
@media (min-width: 640px) {
  .nav-toggle {
    display: none;
  }

  .site-nav {
    display: flex;
    position: static;
    flex-direction: row;
    align-items: center;
    gap: var(--space-md);
    padding: 0;
    background: transparent;
    border: none;
    box-shadow: none;
  }

  .site-nav a {
    padding: 0;
    border: none;
    font-size: 0.9rem;
  }

  .about-stats {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .service-card--wide {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-md);
    align-items: start;
  }
}

@media (min-width: 768px) {
  .about-grid {
    grid-template-columns: 1.4fr 1fr;
    align-items: start;
  }

  .advantages-list {
    grid-template-columns: repeat(3, 1fr);
  }

  .advantage-item {
    grid-template-columns: 1fr;
    border-left: none;
    border-top: 3px solid var(--color-accent);
    border-radius: var(--radius);
  }

  .advantage-num {
    margin-bottom: var(--space-xs);
  }
}

@media (min-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .service-card--wide {
    grid-column: span 2;
  }

  .hero {
    min-height: calc(100vh - var(--header-h));
    display: flex;
    align-items: center;
    padding: var(--space-xl) 0;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}