:root {
  /* 薄雾灰主底 */
  --color-bg-mist: #e8ece9;
  --color-bg-soft: #dfe6e2;
  --color-surface: #f4f6f5;
  /* 墨玉深色页眉 */
  --color-header-ink: #1a2422;
  --color-header-ink-soft: #2a3532;
  /* 杭绿青点缀（数字文创） */
  --color-accent-teal: #3d6b62;
  --color-accent-teal-light: rgba(61, 107, 98, 0.12);
  /* 晨曦暖橙高光（品牌传播） */
  --color-accent-orange: #c97a4a;
  --color-accent-orange-light: rgba(201, 122, 74, 0.14);
  --color-text: #1a2422;
  --color-text-muted: #4a5653;
  --color-line: rgba(26, 36, 34, 0.12);

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-serif: "Songti SC", "Noto Serif SC", "STSong", "SimSun", serif;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;

  --text-sm: 0.9375rem;
  --text-base: 1.0625rem;
  --text-lg: 1.25rem;
  --text-xl: clamp(1.75rem, 4vw, 2.35rem);
  --text-hero: clamp(1.5rem, 3.5vw, 1.125rem);

  --radius-sharp: 2px;
  --max-width: 72rem;
  --header-height: 3.25rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg-mist);
  position: relative;
}

.parallax-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

.parallax-layer {
  position: absolute;
  width: 120%;
  left: -10%;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0.35;
  will-change: transform;
}

.layer-far {
  top: 8%;
  height: 28%;
  background: linear-gradient(90deg, var(--color-bg-soft), #c8d4d0);
}

.layer-mid {
  top: 35%;
  height: 22%;
  background: linear-gradient(120deg, var(--color-accent-teal-light), var(--color-bg-mist));
  opacity: 0.45;
}

.layer-near {
  bottom: 5%;
  height: 25%;
  background: linear-gradient(80deg, var(--color-accent-orange-light), var(--color-bg-soft));
  opacity: 0.3;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-header-ink);
  color: #e8ece9;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-xs) var(--space-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  min-height: var(--header-height);
}

.logo {
  font-family: var(--font-serif);
  font-size: var(--text-sm);
  color: inherit;
  text-decoration: none;
  letter-spacing: 0.02em;
  line-height: 1.3;
  max-width: 12em;
}

.nav-toggle {
  font: inherit;
  background: transparent;
  border: 1px solid rgba(232, 236, 233, 0.35);
  color: inherit;
  padding: 0.35rem 0.65rem;
  cursor: pointer;
  border-radius: var(--radius-sharp);
}

.site-nav {
  display: none;
  flex-direction: column;
  gap: var(--space-xs);
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-header-ink-soft);
  padding: var(--space-sm);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

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

.site-nav a {
  color: #dce4e1;
  text-decoration: none;
  font-size: var(--text-sm);
  padding: 0.25rem 0;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: #fff;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-md) var(--space-sm) var(--space-xl);
}

.hero {
  display: grid;
  gap: var(--space-lg);
  padding-top: var(--space-md);
  padding-bottom: var(--space-xl);
  align-items: start;
}

.hero-tagline {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 600;
  margin: 0 0 var(--space-sm);
  line-height: 1.35;
  color: var(--color-header-ink);
}

.hero-spot {
  margin: 0 0 var(--space-sm);
  font-size: var(--text-lg);
  color: var(--color-accent-teal);
  font-weight: 500;
  border-left: 3px solid var(--color-accent-teal);
  padding-left: var(--space-sm);
}

.hero-sub {
  margin: 0 0 var(--space-md);
  color: var(--color-text-muted);
  max-width: 36em;
}

.hero-cta {
  display: inline-block;
  text-decoration: none;
  color: var(--color-header-ink);
  background: transparent;
  border: 1px solid var(--color-header-ink);
  padding: 0.55rem 1.25rem;
  font-size: var(--text-sm);
  border-radius: var(--radius-sharp);
  transition: background 0.25s ease, color 0.25s ease;
}

.hero-cta:hover,
.hero-cta:focus-visible {
  background: var(--color-header-ink);
  color: var(--color-bg-mist);
}

.hero-visual {
  margin: 0;
  position: relative;
}

.hero-visual img {
  width: 100%;
  max-width: 28rem;
  height: auto;
  display: block;
  margin-left: auto;
  margin-right: 0;
}

.reveal {
  opacity: 0;
  transform: translateY(1.25rem);
  filter: blur(6px);
  transition: opacity 0.85s ease, transform 0.85s ease, filter 0.85s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
  filter: blur(0);
}

.about {
  margin-bottom: var(--space-xl);
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-line);
}

.about-grid {
  display: grid;
  gap: var(--space-sm);
  max-width: 36em;
}

.about-lead h2 {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  margin: 0 0 var(--space-xs);
  font-weight: 600;
}

.about-body p {
  margin: 0;
  color: var(--color-text-muted);
  text-align: justify;
}

.section-title {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  margin: 0 0 var(--space-lg);
  font-weight: 600;
}

.service-ladder {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.service-item article {
  padding: var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sharp);
  box-shadow: none;
}

.service-item--1 {
  margin-left: 0;
}

.service-item--2 {
  margin-left: 0;
  border-left: 3px solid var(--color-header-ink);
}

.service-item--3 {
  margin-left: 0;
  background: linear-gradient(135deg, var(--color-surface) 70%, var(--color-accent-teal-light));
}

.service-item--3 article {
  background: transparent;
  border-color: rgba(61, 107, 98, 0.2);
}

.service-item--4 {
  margin-left: 0;
  margin-bottom: var(--space-lg);
  background: linear-gradient(160deg, var(--color-surface) 65%, var(--color-accent-orange-light));
}

.service-item--4 article {
  background: transparent;
  border-color: rgba(201, 122, 74, 0.25);
  padding-bottom: calc(var(--space-xl) + var(--space-md));
}

.service-item h3 {
  font-family: var(--font-serif);
  margin: 0 0 var(--space-xs);
  font-size: var(--text-lg);
}

.service-spot {
  margin: 0 0 var(--space-sm);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-accent-teal);
}

.service-item--4 .service-spot {
  color: var(--color-accent-orange);
}

.service-text {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.reasons {
  padding: var(--space-xl) 0 var(--space-lg);
  margin-top: var(--space-md);
  border-top: 1px solid var(--color-line);
}

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

.reason-list h3 {
  font-family: var(--font-serif);
  margin: 0 0 var(--space-xs);
  font-size: var(--text-base);
  font-weight: 600;
}

.reason-list p {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding-left: var(--space-sm);
  border-left: 2px solid var(--color-accent-orange);
}

.site-footer {
  background: var(--color-header-ink);
  color: #b8c4c0;
  text-align: center;
  padding: var(--space-lg) var(--space-sm);
  font-size: var(--text-sm);
}

.site-footer p {
  margin: 0 0 var(--space-xs);
}

.beian {
  margin-top: var(--space-sm);
}

.beian a {
  color: #dce4e1;
  text-decoration: none;
}

.beian a:hover,
.beian a:focus-visible {
  text-decoration: underline;
}

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

  .header-inner {
    position: relative;
  }

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

  .service-item--1 {
    margin-left: 0;
    max-width: 92%;
  }

  .service-item--2 {
    margin-left: 6%;
    max-width: 94%;
  }

  .service-item--3 {
    margin-left: 3%;
    max-width: 90%;
  }

  .service-item--4 {
    margin-left: 10%;
    max-width: 88%;
  }

  .reason-list {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
  }

  .reason-list p {
    border-left-color: var(--color-accent-teal);
  }

  .reason-list li:nth-child(3) p {
    border-left-color: var(--color-accent-orange);
  }

  .hero {
    grid-template-columns: 1.02fr 0.98fr;
    gap: var(--space-lg);
    align-items: start;
    padding-top: clamp(1.5rem, 2.5vw, 3rem);
    padding-bottom: var(--space-xl);
  }

  .hero-visual img {
    max-width: 100%;
  }
}

@media (min-width: 1100px) {
  .hero {
    grid-template-columns: 1.05fr 0.95fr;
    gap: var(--space-xl);
  }

  .hero-copy {
    padding-right: var(--space-md);
  }

  .about-body p {
    column-count: 1;
    font-size: var(--text-base);
  }

  .service-ladder {
    gap: var(--space-lg);
  }
}