:root {
  --brown: #7d5b40;
  --taupe: #b09d83;
  --cream: #ebe3cc;
  --deep: #4c2814;
  --sand: #d0c3a6;
  --white: #fffdf8;
  --shadow: 0 24px 70px rgba(76, 40, 20, 0.12);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
/* 固定导航会盖住锚点标题，统一补偿导航高度 */
section[id] { scroll-margin-top: 74px; }
#home { scroll-margin-top: 0; }
body {
  margin: 0;
  color: var(--deep);
  background: var(--white);
  font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
body.menu-open, body.no-scroll { overflow: hidden; }
img { display: block; width: 100%; }
a { color: inherit; }
button, input, textarea, select { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a:focus-visible, button:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--brown);
  outline-offset: 3px;
}
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 300;
  padding: 13px 22px;
  color: var(--cream);
  background: var(--deep);
  text-decoration: none;
  font-size: 14px;
  transform: translateY(-220%);
  transition: transform .3s var(--ease);
}
.skip-link:focus { transform: none; }

/* 导航栏：常驻毛玻璃衬底。
   首屏图片明暗不可控，透明导航必然出现"深色字压深色树冠"的不可读情况，
   因此不再做全透明起始态，改为常驻半透明玻璃底 + 发丝分隔线。 */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
  padding: 0 clamp(22px, 5vw, 76px);
  color: var(--deep);
  background: rgba(255, 253, 248, .76);
  backdrop-filter: blur(20px) saturate(1.25);
  -webkit-backdrop-filter: blur(20px) saturate(1.25);
  box-shadow: inset 0 -1px 0 rgba(76, 40, 20, .09);
  transition: background-color .4s var(--ease), box-shadow .4s var(--ease), color .4s var(--ease);
}
.site-header.scrolled {
  color: var(--deep);
  background: rgba(255, 253, 248, .95);
  box-shadow: inset 0 -1px 0 rgba(76, 40, 20, .12), 0 10px 34px rgba(76, 40, 20, .07);
}
/* 导航底边向下渐隐 22px，避免在首屏图片上出现一条生硬的白色横带 */
.theme-a .site-header::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  height: 22px;
  background: linear-gradient(180deg, rgba(255, 253, 248, .7), rgba(255, 253, 248, 0));
  pointer-events: none;
  transition: opacity .4s var(--ease);
}
.theme-a .site-header.scrolled::after { opacity: 0; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  aspect-ratio: 1;
  color: var(--cream);
  background: var(--deep);
  font-family: Georgia, serif;
  font-size: 18px;
}
.brand-copy strong { display: block; font-size: 17px; font-weight: 600; }
.brand-copy small { display: block; margin-top: 3px; font-size: 10px; opacity: .68; }
.site-nav { display: flex; align-items: center; gap: clamp(18px, 2.5vw, 38px); }
.site-nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  text-decoration: none;
  font-size: 14px;
}
.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 10px;
  height: 1px;
  background: currentColor;
  transition: right .4s var(--ease);
}
.site-nav a:hover::after, .site-nav a.active::after { right: 0; }
.site-nav .nav-contact {
  padding: 0 20px;
  border: 1px solid currentColor;
  border-radius: 2px;
  transition: color .35s var(--ease), background-color .35s var(--ease), border-color .35s var(--ease);
}
.site-nav .nav-contact:hover { color: var(--cream); background: var(--deep); border-color: var(--deep); }
.site-nav .nav-contact::after { display: none; }
.menu-button {
  display: none;
  width: 44px;
  height: 44px;
  border: 0;
  color: inherit;
  background: transparent;
  cursor: pointer;
}
.menu-button span, .menu-button::before, .menu-button::after {
  content: "";
  display: block;
  width: 22px;
  height: 1px;
  margin: 6px auto;
  background: currentColor;
  transition: transform .35s var(--ease), opacity .25s;
}
.menu-open .menu-button span { opacity: 0; }
.menu-open .menu-button::before { transform: translateY(7px) rotate(45deg); }
.menu-open .menu-button::after { transform: translateY(-7px) rotate(-45deg); }

.hero { position: relative; min-height: 94vh; overflow: hidden; }
.hero-copy { position: relative; z-index: 2; }
.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 22px;
  color: var(--brown);
  font-size: 12px;
  font-weight: 600;
}
.eyebrow::before { content: ""; width: 38px; height: 1px; background: currentColor; }
/* 内容小标签（描边胶囊），深色底上直接继承 currentColor */
.pill {
  display: inline-block;
  align-self: flex-start;   /* 在 flex 中保持内容宽度，不被拉伸成整行 */
  padding: 5px 13px;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-size: 11px;
  line-height: 1.5;
  letter-spacing: .1em;
  opacity: .7;
}
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 24px; font-family: "Songti SC", "STSong", "SimSun", "Noto Serif SC", serif; font-weight: 500; line-height: 1.15; }
h2 { margin-bottom: 20px; font-family: "Songti SC", "STSong", "SimSun", "Noto Serif SC", serif; font-weight: 500; line-height: 1.25; }
p { line-height: 1.9; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border: 1px solid var(--deep);
  border-radius: 2px;
  color: var(--cream);
  background: var(--deep);
  text-decoration: none;
  cursor: pointer;
  transition: transform .35s var(--ease), background-color .35s, color .35s, box-shadow .35s;
}
.button:hover { transform: translateY(-3px); box-shadow: 0 12px 28px rgba(76, 40, 20, .18); }
.button.ghost { color: var(--deep); background: transparent; }
.button.ghost:hover { color: var(--cream); background: var(--deep); }

.section { position: relative; padding: clamp(80px, 10vw, 150px) clamp(22px, 7vw, 110px); }
.section-inner { width: min(1180px, 100%); margin: 0 auto; }
.section-heading { display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); gap: 8vw; align-items: end; margin-bottom: 68px; }
.section-heading h2 { margin: 0; font-size: clamp(34px, 4.2vw, 64px); }
.section-heading p { margin: 0; color: rgba(76, 40, 20, .72); }
.number { color: var(--brown); font-family: Georgia, serif; font-size: 13px; }
.reveal { opacity: 0; transform: translateY(36px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
.reveal.visible { opacity: 1; transform: none; }

.stat-strip { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid rgba(76,40,20,.18); border-bottom: 1px solid rgba(76,40,20,.18); }
.stat { padding: 30px clamp(16px, 3vw, 40px); border-right: 1px solid rgba(76,40,20,.18); }
.stat:last-child { border-right: 0; }
.stat strong { display: block; margin-bottom: 8px; color: var(--brown); font-family: Georgia, serif; font-size: clamp(25px, 3vw, 42px); font-weight: 400; }
.stat span { font-size: 13px; opacity: .72; }

.image-frame { position: relative; overflow: hidden; background: var(--sand); }
.image-frame img { height: 100%; object-fit: cover; transition: transform 1.2s var(--ease); }
.image-frame:hover img { transform: scale(1.035); }
.image-frame::after { content: ""; position: absolute; inset: 0; border: 1px solid rgba(255,255,255,.22); pointer-events: none; }
/* 浏览器 UA 样式表给 <figure> 默认 margin:1em 40px，图框左右会被各挤掉 40px（实测列宽 278.5 → 图框仅 198.5），
   导致图片比例失真、列间空白异常。这里统一清零，间距一律交给 grid/flex 的 gap 或各组件显式 margin 控制。 */
.theme-a figure.image-frame { margin: 0; }

.service-list { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid rgba(76,40,20,.2); }
.service-item { position: relative; padding: 26px 18px 28px; border-right: 1px solid rgba(76,40,20,.2); cursor: pointer; }
.service-item:last-child { border-right: 0; }
.service-item img { height: 220px; object-fit: cover; margin-bottom: 25px; }
.service-item small { color: var(--brown); font-family: Georgia, serif; }
.service-item h3 { margin: 10px 0 12px; font-size: 20px; }
.service-item p { margin: 0; color: rgba(76,40,20,.68); font-size: 14px; line-height: 1.75; }
.service-item::after { content: "+"; position: absolute; top: 26px; right: 18px; font-size: 22px; transition: transform .35s; }
.service-item.expanded::after { transform: rotate(45deg); }
.service-more { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .55s var(--ease); }
.service-more > div { overflow: hidden; }
.service-item.expanded .service-more { grid-template-rows: 1fr; }
.service-more ul { margin: 16px 0 0; padding: 16px 0 0 18px; border-top: 1px solid rgba(76,40,20,.15); color: rgba(76,40,20,.72); font-size: 13px; line-height: 2; }

.season-tabs { display: flex; gap: 8px; margin: 32px 0 22px; }
.season-tab {
  flex: 1;
  min-height: 42px;
  border: 1px solid rgba(76,40,20,.24);
  color: var(--deep);
  background: transparent;
  cursor: pointer;
  transition: color .35s, background-color .35s;
}
.season-tab.active, .season-tab:hover { color: var(--cream); background: var(--deep); }
.season-view { position: relative; height: 510px; overflow: hidden; }
.season-panel { position: absolute; inset: 0; opacity: 0; visibility: hidden; transition: opacity .75s var(--ease), transform .75s var(--ease); transform: scale(1.02); }
.season-panel.active { opacity: 1; visibility: visible; transform: scale(1); }
.season-panel img { height: 100%; object-fit: cover; }
.season-caption { position: absolute; left: 28px; bottom: 28px; max-width: 340px; padding: 20px 22px; color: var(--cream); background: rgba(76,40,20,.82); -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px); }
.season-caption strong { display: block; margin-bottom: 7px; font-size: 20px; }
.season-caption span { font-size: 13px; line-height: 1.7; }

.quality-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: clamp(32px, 6vw, 88px); align-items: center; }
.quality-image { height: 610px; }
.quality-steps { border-top: 1px solid rgba(76,40,20,.2); }
.quality-step { display: grid; grid-template-columns: 62px 1fr; gap: 16px; padding: 22px 0; border-bottom: 1px solid rgba(76,40,20,.2); }
.quality-step b { color: var(--brown); font-family: Georgia, serif; font-size: 20px; font-weight: 400; }
.quality-step h3 { margin-bottom: 7px; font-size: 17px; }
.quality-step p { margin: 0; color: rgba(76,40,20,.68); font-size: 13px; line-height: 1.8; }

.contact-wrap { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); min-height: 650px; }
/* 底部配图换为 1:1 正方形构图后，若只靠 height:100% 在部分内核下会解析失败露白。
   统一改成「父盒定位 + 子图绝对定位铺满」，PC 撑满左栏、H5 撑满整行宽。 */
.contact-image { position: relative; min-height: 460px; }
.contact-image img { position: absolute; top: 0; left: 0; width: 100%; height: 100%; object-fit: cover; object-position: 50% 50%; }
.contact-copy { display: flex; flex-direction: column; justify-content: center; padding: clamp(42px, 7vw, 100px); color: var(--cream); background: var(--deep); }
.contact-copy h2 { font-size: clamp(38px, 5vw, 68px); }
.contact-copy p { color: rgba(235,227,204,.75); }
.contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 30px; }
.field { display: grid; gap: 7px; }
.field.full { grid-column: 1 / -1; }
.field label { color: var(--sand); font-size: 12px; }
.field input, .field textarea, .field select {
  width: 100%;
  padding: 13px 2px;
  border: 0;
  border-bottom: 1px solid rgba(235,227,204,.42);
  border-radius: 0;
  outline: none;
  color: var(--cream);
  background: transparent;
}
.field textarea { min-height: 74px; resize: vertical; }
.field input:focus, .field textarea:focus, .field select:focus { border-color: var(--cream); }
.contact-form .button { grid-column: 1 / -1; justify-self: start; border-color: var(--cream); color: var(--deep); background: var(--cream); }

.site-footer { display: flex; justify-content: space-between; gap: 20px; padding: 28px clamp(22px, 7vw, 110px); color: rgba(235,227,204,.65); background: #32190d; font-size: 12px; }
.back-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 20;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 1px solid rgba(235,227,204,.5);
  border-radius: 50%;
  color: var(--cream);
  background: rgba(76,40,20,.88);
  opacity: 0;
  transform: translateY(12px);
  cursor: pointer;
  pointer-events: none;
  transition: .35s var(--ease);
}
.back-top.show { opacity: 1; transform: none; pointer-events: auto; }
.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  z-index: 100;
  padding: 15px 24px;
  color: var(--cream);
  background: var(--deep);
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translate(-50%, 18px);
  pointer-events: none;
  transition: .4s var(--ease);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ============================================================
   Option A: Warm Order —— 客户拍板方案（定稿版式）
   设计方向：轻奢克制。亮米底 + 卡其棕点缀、大留白、发丝线分隔，
   动效只用 opacity / transform，符合"少即是多 + 所见即所得"。
   ============================================================ */
.theme-a { background: #fffdf8; }

/* --- 首屏 ------------------------------------------------- */
.theme-a .hero { display: grid; grid-template-columns: 43% 57%; align-items: center; min-height: 92vh; background: var(--cream); }
.theme-a .hero-copy { padding: 118px 8vw 70px; }
.theme-a .hero h1 { font-size: clamp(46px, 6vw, 82px); }
.theme-a .hero-copy p { max-width: 500px; color: rgba(76,40,20,.7); }
.theme-a .hero-media { align-self: stretch; min-height: 620px; }
.theme-a .hero-media img { height: 100%; object-fit: cover; }
/* 米色文案区与照片硬切显得生硬，加一层水平渐变做过渡 */
.theme-a .hero-media::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  z-index: 1;
  width: 24%;
  background: linear-gradient(90deg, var(--cream), rgba(235, 227, 204, 0));
  pointer-events: none;
}

/* --- 关于安恒磐 ------------------------------------------- */
.theme-a .about-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 28px; }
.theme-a .about-grid .image-frame:first-child { height: 560px; }
.theme-a .about-side { display: grid; grid-template-rows: 1fr auto; gap: 28px; }
.theme-a .about-side .image-frame { min-height: 290px; }
.theme-a .about-note { padding: 30px; background: var(--cream); }

/* --- 综合服务：基础服务为主、增值定制为辅的非对称双栏 ------- */
.theme-a .services-section { background: #f6f1e4; }
.theme-a .service-matrix { display: grid; grid-template-columns: 1.32fr 1fr; gap: 26px; align-items: start; }
.theme-a .service-block {
  display: flex;
  flex-direction: column;
  gap: 30px;
  padding: 30px;
  background: var(--white);
  box-shadow: 0 22px 60px rgba(76, 40, 20, .06);
}
.theme-a .service-block.secondary { background: #fbf7ec; box-shadow: none; }
.theme-a .service-block .image-frame { height: 330px; }
.theme-a .service-block h3 { margin: 14px 0; font-family: "Songti SC", "STSong", "SimSun", "Noto Serif SC", serif; font-size: clamp(26px, 2.4vw, 36px); font-weight: 500; }
.theme-a .service-block .service-block-copy > p { margin: 0; color: rgba(76, 40, 20, .7); font-size: 14px; }
.theme-a .service-block:hover .image-frame img { transform: scale(1.035); }

/* 服务细项：发丝线 + 编号 */
.service-points { margin: 0; padding: 0; list-style: none; border-top: 1px solid rgba(76, 40, 20, .16); }
.service-points li {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid rgba(76, 40, 20, .16);
  transition: transform .4s var(--ease), border-color .4s var(--ease);
}
.service-points li:hover { transform: translateX(5px); border-color: rgba(125, 91, 64, .5); }
.service-points b { padding-top: 3px; color: var(--brown); font-family: Georgia, serif; font-size: 13px; font-weight: 400; letter-spacing: .04em; }
.service-points h4 { margin: 0 0 6px; font-size: 16px; font-weight: 600; }
.service-points p { margin: 0; color: rgba(76, 40, 20, .66); font-size: 13px; line-height: 1.75; }
.service-points.compact li { padding: 14px 0; }

/* --- 景观营造 --------------------------------------------- */
.theme-a .landscape-section { background: var(--cream); }
.theme-a .landscape-feature { display: grid; grid-template-columns: 1.28fr .72fr; gap: 34px; align-items: stretch; margin-bottom: 48px; }
.theme-a .landscape-feature .image-frame { min-height: 470px; }
.theme-a .landscape-note { display: flex; flex-direction: column; justify-content: center; }
.theme-a .landscape-note h3 { margin: 16px 0 18px; font-family: "Songti SC", "STSong", "SimSun", "Noto Serif SC", serif; font-size: clamp(26px, 2.6vw, 38px); font-weight: 500; line-height: 1.32; }
.theme-a .landscape-note p { margin: 0; color: rgba(76, 40, 20, .72); font-size: 14px; }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 28px 0 0; padding: 0; list-style: none; }
.tag-row li { padding: 7px 14px; border: 1px solid rgba(76, 40, 20, .24); color: rgba(76, 40, 20, .82); font-size: 12px; }

/* 四季：一行平铺展示（与上方景观 feature 的横向节奏一致），悬停放大由 .image-frame 自带 */
.theme-a .season-row { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 22px; }
.theme-a .season-col { display: flex; flex-direction: column; }
/* 竖版比例盒：用 padding-top 撑高 + 图片绝对定位填充。
   不用 aspect-ratio——Safari 对「flex 子项 + 无确定高度」的比例推导与 Chrome 不一致，会导致四栏高度错乱；
   同时图片必须显式 width:100%，否则按固有像素宽度渲染、右侧露底色。 */
.theme-a .season-col .image-frame { height: 0; padding-top: 133.3333%; }
.theme-a .season-col .image-frame img { position: absolute; top: 0; left: 0; width: 100%; height: 100%; object-fit: cover; }
.theme-a .season-col-head { display: flex; align-items: baseline; gap: 10px; margin: 20px 0 0; padding-top: 16px; border-top: 1px solid rgba(76, 40, 20, .16); }
.theme-a .season-col-head b { font-family: "Songti SC", "STSong", "SimSun", "Noto Serif SC", serif; font-size: 26px; font-weight: 500; transition: color .4s var(--ease); }
.theme-a .season-col-head span { color: rgba(76, 40, 20, .52); font-size: 12px; letter-spacing: .06em; }
.theme-a .season-col p { margin: 9px 0 0; color: rgba(76, 40, 20, .7); font-size: 13px; line-height: 1.75; }
.theme-a .season-col:hover .season-col-head b { color: var(--brown); }

/* --- 智创拓新：浅米色区块（客户反馈：原深棕底过重，改与上方区块同一浅色系） --- */
.theme-a .tech-section { color: var(--deep); background: #f6f1e4; }
.theme-a .tech-section::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(46rem 30rem at 86% 0%, rgba(176, 157, 131, .2), transparent 62%);
}
.theme-a .tech-section .section-inner { position: relative; z-index: 1; }
.theme-a .tech-section .number { color: var(--brown); }
.theme-a .tech-section .section-heading p { color: rgba(76, 40, 20, .72); }
.theme-a .tech-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 26px; }
.theme-a .tech-card { display: flex; flex-direction: column; }
.theme-a .tech-card figure { margin: 0 0 24px; overflow: hidden; background: #e6dcc6; }
.theme-a .tech-card figure img { height: 258px; object-fit: cover; transition: transform 1.2s var(--ease); }
.theme-a .tech-card:hover figure img { transform: scale(1.05); }
.theme-a .tech-card h3 { margin: 14px 0 10px; font-family: "Songti SC", "STSong", "SimSun", "Noto Serif SC", serif; font-size: 24px; font-weight: 500; }
.theme-a .tech-card p { margin: 0; color: rgba(76, 40, 20, .68); font-size: 13.5px; line-height: 1.85; }
.theme-a .tech-note { margin: 42px 0 0; padding-top: 24px; border-top: 1px solid rgba(76, 40, 20, .18); color: rgba(76, 40, 20, .6); font-size: 13px; }

/* 板块内分层小标题：地面智能装备 */
.theme-a .tech-subhead { display: flex; align-items: baseline; gap: 14px; margin: 0 0 26px; padding-bottom: 16px; border-bottom: 1px solid rgba(76, 40, 20, .18); }
.theme-a .tech-subhead b { font-family: "Songti SC", "STSong", "SimSun", "Noto Serif SC", serif; font-size: 18px; font-weight: 500; letter-spacing: .02em; }
.theme-a .tech-subhead span { color: rgba(76, 40, 20, .48); font-size: 11px; letter-spacing: .18em; }

/* 空中智巡：智创拓新的第二层，细线分隔，不与主标题抢层级 */
.theme-a .tech-air { margin-top: 58px; padding-top: 46px; border-top: 1px solid rgba(76, 40, 20, .18); }
.theme-a .tech-air-head { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: 44px; align-items: end; margin-bottom: 32px; padding-bottom: 18px; border-bottom: 1px solid rgba(76, 40, 20, .18); }
.theme-a .tech-air-title b { display: block; font-family: "Songti SC", "STSong", "SimSun", "Noto Serif SC", serif; font-size: clamp(22px, 2.2vw, 28px); font-weight: 500; }
.theme-a .tech-air-title span { display: block; margin-top: 9px; color: var(--brown); font-size: 11px; letter-spacing: .2em; }
.theme-a .tech-air-head p { margin: 0; color: rgba(76, 40, 20, .72); font-size: 13.5px; line-height: 1.9; }
.theme-a .tech-air-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 26px; }
.theme-a .tech-air-card { display: flex; flex-direction: column; }
/* 16:10 比例盒，同样用 padding 撑高而非 aspect-ratio，保证 Safari 与其他内核表现一致 */
.theme-a .tech-air-card figure { position: relative; height: 0; margin: 0 0 20px; padding-top: 62.5%; overflow: hidden; background: #e6dcc6; }
.theme-a .tech-air-card figure img { position: absolute; top: 0; left: 0; width: 100%; height: 100%; object-fit: cover; transition: transform 1.2s var(--ease); }
.theme-a .tech-air-card:hover figure img { transform: scale(1.05); }
/* 图片上仍保留底部压暗：左上文案区不受影响，左下角编号在浅色画面上也读得清 */
.theme-a .tech-air-card figure::after { content: ""; position: absolute; inset: auto 0 0 0; height: 46%; background: linear-gradient(180deg, rgba(58, 30, 15, 0), rgba(58, 30, 15, .55)); }
.theme-a .tech-index { position: absolute; left: 16px; bottom: 13px; z-index: 2; display: flex; align-items: center; gap: 9px; color: var(--cream); font-family: "Songti SC", "STSong", "SimSun", "Noto Serif SC", serif; font-size: 14px; letter-spacing: .16em; text-shadow: 0 1px 14px rgba(38, 19, 10, .6); }
.theme-a .tech-index::before { content: ""; width: 20px; height: 1px; background: currentColor; opacity: .7; }
.theme-a .tech-air-card h4 { margin: 0 0 10px; font-family: "Songti SC", "STSong", "SimSun", "Noto Serif SC", serif; font-size: 20px; font-weight: 500; }
.theme-a .tech-air-card p { margin: 0; color: rgba(76, 40, 20, .68); font-size: 13.5px; line-height: 1.85; }
.theme-a .tech-air-tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0 0; padding: 0; list-style: none; }
.theme-a .tech-air-tags li { padding: 5px 11px; border: 1px solid rgba(76, 40, 20, .22); color: rgba(76, 40, 20, .72); font-size: 11.5px; letter-spacing: .06em; }

/* --- 品质保障 --------------------------------------------- */
.theme-a .quality-section { background: #fffdf8; }

/* --- 项目实样 --------------------------------------------- */
.theme-a .cases-section { background: #f6f1e4; }
.cases-grid { display: grid; grid-template-columns: 1.12fr 1fr; grid-auto-rows: 248px; gap: 20px; }
.case-card { position: relative; overflow: hidden; padding: 0; border: 0; background: var(--sand); cursor: zoom-in; }
/* 高卡片（tall）跨两行，用来打断整齐的两列网格；
   两张 tall 分别落在第 1、第 6 位，8 张图刚好铺满 5 行、不留空洞 */
.case-card.tall { grid-row: span 2; }
.case-card img { width: 100%; height: 100%; object-fit: cover; transition: transform 1.3s var(--ease); }
.case-card:hover img { transform: scale(1.045); }
.case-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(38, 19, 10, 0) 44%, rgba(38, 19, 10, .7));
  opacity: .82;
  transition: opacity .5s var(--ease);
}
.case-card:hover::after { opacity: 1; }
.case-caption { position: absolute; left: 22px; right: 22px; bottom: 20px; z-index: 2; color: var(--cream); font-size: 13px; text-align: left; letter-spacing: .02em; }

/* --- 联系我们：直接展示联系方式，不做表单 ------------------ */
.theme-a .contact-copy .eyebrow { color: var(--sand); }
.contact-list { margin: 34px 0 0; padding: 0; border-top: 1px solid rgba(235, 227, 204, .24); }
.contact-list > div { display: grid; grid-template-columns: 92px 1fr; gap: 18px; padding: 17px 0; border-bottom: 1px solid rgba(235, 227, 204, .24); }
.contact-list dt { padding-top: 4px; color: var(--sand); font-size: 12px; letter-spacing: .08em; }
.contact-list dd { margin: 0; font-size: 16px; }
.contact-list dd a { text-decoration: none; border-bottom: 1px solid rgba(235, 227, 204, .38); padding-bottom: 2px; transition: border-color .3s var(--ease), color .3s var(--ease); }
.contact-list dd a:hover { color: var(--white); border-color: var(--cream); }
/* 号码下方的对接人信息，弱化为次级小字 */
.contact-list dd .contact-meta { display: block; margin-top: 6px; color: rgba(235, 227, 204, .58); font-size: 12.5px; letter-spacing: .04em; }
.contact-note { margin: 26px 0 0; color: rgba(235, 227, 204, .6); font-size: 12.5px; line-height: 1.8; }

/* --- 项目实样灯箱 ----------------------------------------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  padding: clamp(20px, 5vw, 70px);
  background: rgba(38, 19, 10, .94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  opacity: 0;
  transition: opacity .35s var(--ease);
}
.lightbox[hidden] { display: none; }
.lightbox.show { opacity: 1; }
.lightbox figure { margin: 0; max-width: 1180px; }
.lightbox img { width: auto; max-width: 100%; max-height: 76vh; object-fit: contain; box-shadow: 0 40px 90px rgba(0, 0, 0, .5); }
.lightbox figcaption { margin-top: 18px; color: rgba(235, 227, 204, .82); font-size: 13px; letter-spacing: .04em; }
.lightbox-close {
  position: absolute;
  top: 22px;
  right: 22px;
  width: 48px;
  height: 48px;
  border: 1px solid rgba(235, 227, 204, .4);
  border-radius: 50%;
  color: var(--cream);
  background: transparent;
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
  transition: color .3s var(--ease), background-color .3s var(--ease);
}
.lightbox-close:hover { color: var(--deep); background: var(--cream); }

/* --- 入场错峰：同一网格内依次出现 ------------------------- */
.tech-grid > .reveal:nth-child(2) { transition-delay: .1s; }
.tech-grid > .reveal:nth-child(3) { transition-delay: .2s; }
.cases-grid > .reveal:nth-child(2) { transition-delay: .08s; }
.cases-grid > .reveal:nth-child(3) { transition-delay: .16s; }
.cases-grid > .reveal:nth-child(4) { transition-delay: .24s; }
.cases-grid > .reveal:nth-child(5) { transition-delay: .32s; }
.cases-grid > .reveal:nth-child(6) { transition-delay: .4s; }
.cases-grid > .reveal:nth-child(7) { transition-delay: .48s; }
.cases-grid > .reveal:nth-child(8) { transition-delay: .56s; }

@media (max-width: 980px) {
  .site-header { height: 68px; }
  /* 毛玻璃会让 fixed 子元素以顶部栏为定位容器，展开时取消以恢复全屏菜单。 */
  .menu-open .site-header {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
  .menu-open .site-header::after { opacity: 0; }
  section[id] { scroll-margin-top: 68px; }
  .menu-button { display: block; z-index: 2; }
  .site-nav {
    position: fixed;
    inset: 0;
    height: 100vh;
    height: 100dvh;
    padding: 88px 24px max(24px, env(safe-area-inset-bottom));
    overflow-y: auto;
    overscroll-behavior: contain;
    z-index: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    justify-content: safe center;
    gap: 24px;
    color: var(--cream);
    background: rgba(76,40,20,.98);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition: .4s var(--ease);
  }
  .menu-open .site-nav { opacity: 1; visibility: visible; transform: none; }
  .site-nav a { flex-shrink: 0; font-size: 20px; }
  .site-header.scrolled .menu-button { color: var(--deep); }
  .menu-open .site-header .menu-button { color: var(--cream); }
  .section-heading, .quality-grid { grid-template-columns: 1fr; }
  .contact-wrap { grid-template-columns: 1fr; min-height: 0; }
  .section-heading { gap: 20px; margin-bottom: 46px; }
  .service-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .service-item:nth-child(2) { border-right: 0; }
  .stat-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(-n+2) { border-bottom: 1px solid rgba(76,40,20,.18); }
  .theme-a .hero { grid-template-columns: 1fr; padding-top: 68px; }
  .theme-a .hero-copy { padding: 70px 7vw 50px; }
  .theme-a .hero-media { min-height: 52vh; }
  .theme-a .about-grid { grid-template-columns: 1fr; }
  .theme-a .about-grid .image-frame:first-child { height: 460px; }
  .theme-a .service-matrix { grid-template-columns: 1fr; }
  .theme-a .landscape-feature { grid-template-columns: 1fr; gap: 28px; }
  .theme-a .landscape-feature .image-frame { min-height: 380px; }
  .theme-a .season-row { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px 18px; }
  .theme-a .tech-grid { grid-template-columns: 1fr; }
  .theme-a .tech-card figure img { height: 280px; }
  .theme-a .tech-air-head { grid-template-columns: 1fr; gap: 18px; align-items: start; }
  .theme-a .tech-air-grid { grid-template-columns: 1fr; gap: 34px; }
  .theme-a .tech-air-card figure { padding-top: 56.25%; }
  .cases-grid { grid-template-columns: 1fr; grid-auto-rows: 265px; }
  .case-card.tall { grid-row: span 1; }
}

@media (max-width: 680px) {
  .brand-copy small { display: none; }
  .section { padding: 72px 20px; }
  .hero-actions .button { flex: 1; }
  .stat-strip, .service-list { grid-template-columns: minmax(0, 1fr); }
  .stat, .service-item { border-right: 0; border-bottom: 1px solid rgba(76,40,20,.18); }
  .stat:nth-child(-n+3) { border-bottom: 1px solid rgba(76,40,20,.18); }
  .season-view { height: 460px; }
  .season-caption { left: 14px; right: 14px; bottom: 14px; }
  .quality-image { height: 420px; }
  .contact-form { grid-template-columns: 1fr; }
  .contact-wrap { display: flex; flex-direction: column; }
  .contact-copy { order: 0 !important; }
  .contact-image { min-height: 0; height: 62vh; max-height: 520px; }
  .site-footer { flex-direction: column; }
  .theme-a .hero h1 { font-size: 46px; }
  .theme-a .about-grid .image-frame:first-child { height: 410px; }
  .theme-a .hero-media::before { display: none; }
  .theme-a .service-block { gap: 24px; padding: 22px; }
  .theme-a .service-block .image-frame { height: 240px; }
  /* 手机端四季改为单列，一屏一季（不再两列并排） */
  .theme-a .season-row { grid-template-columns: minmax(0, 1fr); gap: 38px; }
  .theme-a .season-col-head { margin-top: 14px; padding-top: 12px; }
  .theme-a .season-col-head b { font-size: 21px; }
  .theme-a .season-col p { font-size: 12px; }
  /* 智创拓新：手机端收紧分层标题与空中卡片间距 */
  .theme-a .tech-subhead { margin-bottom: 20px; padding-bottom: 13px; }
  .theme-a .tech-subhead b { font-size: 16px; }
  .theme-a .tech-air { margin-top: 42px; padding-top: 34px; }
  .theme-a .tech-air-head { gap: 14px; margin-bottom: 24px; padding-bottom: 14px; }
  .theme-a .tech-air-title b { font-size: 21px; }
  .theme-a .tech-air-grid { gap: 28px; }
  .theme-a .tech-air-card figure { padding-top: 66.6667%; }
  .theme-a .tech-air-card h4 { font-size: 18px; }
  .theme-a .tech-air-card p { font-size: 12.5px; }
  .cases-grid { grid-auto-rows: 230px; gap: 14px; }
  .case-caption { left: 16px; right: 16px; bottom: 14px; }
  .contact-list > div { grid-template-columns: 1fr; gap: 5px; }
  .contact-list dt { padding-top: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
  .case-card:hover img,
  .theme-a .tech-card:hover figure img,
  .theme-a .tech-air-card:hover figure img,
  .theme-a .service-block:hover .image-frame img,
  .service-points li:hover { transform: none; }
}