/* ============================================================
   VBN STONE · 新站样式（黑色极简高端风 · 全端自适应）
   断点: >=1200 桌面 / 768~1199 平板 / <=767 手机
   ============================================================ */

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

:root {
  --bg: #000000;
  --fg: #ffffff;
  --fg-dim: rgba(255, 255, 255, 0.65);
  --line: rgba(255, 255, 255, 0.35);
  --header-bg: rgba(0, 0, 0, 0.8);
  --maxw: 1264px;
  --font-cn: "AlimamaFangYuanTiVF", "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-en: "Biko", "Helvetica Neue", Arial, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-cn);
  font-weight: 300;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- 开屏 Splash ---------- */
.splash {
  position: fixed; inset: 0; z-index: 1000;
  background: #000;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  opacity: 1;
  transition: opacity 1.2s ease;
}
.splash.hide {
  opacity: 0; visibility: hidden; pointer-events: none;
  transition: opacity 1.2s ease, visibility 0s linear 1.2s;
}
.splash-inner {
  text-align: center; padding: 0 24px;
  transition: opacity 0.9s ease, transform 1.2s ease;
}
.splash.hide .splash-inner { opacity: 0; transform: translateY(-16px); }
.splash-logo { width: clamp(180px, 40vw, 312px); margin: 0 auto clamp(30px, 6vh, 66px); }
.splash-divider { width: 1px; height: clamp(120px, 30vh, 368px); margin: 0 auto clamp(30px, 6vh, 68px); background: rgba(255,255,255,0.7); }
.splash-en { font-size: clamp(13px, 2vw, 18px); letter-spacing: 0.18em; margin-bottom: 10px; font-family: var(--font-en); }
.splash-cn { font-size: clamp(13px, 2vw, 18px); letter-spacing: 0.8em; margin-right: -0.8em; }
.splash-tip { margin-top: 40px; font-size: 12px; color: var(--fg-dim); letter-spacing: 0.3em; animation: breathe 2s infinite; }
@keyframes breathe { 0%,100% { opacity: 0.35; } 50% { opacity: 1; } }

/* ---------- 顶部（吸顶） ---------- */
.site-top {
  position: sticky; top: 0; z-index: 100;
  background: var(--header-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.site-header {
  max-width: 1090px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 28px 24px 20px;
  position: relative;
}
.header-left, .header-right { width: 200px; display: flex; align-items: center; }
.header-right { justify-content: flex-end; gap: 18px; }

.search-box { display: flex; align-items: center; cursor: pointer; }
.search-box img { width: 14px; height: 14px; margin-right: 8px; }
.search-box input {
  background: none; border: 0; outline: 0; color: #fff;
  font-size: 14px; font-family: var(--font-cn); width: 110px;
  border-bottom: 1px solid transparent; transition: border-color .3s;
}
.search-box input::placeholder { color: var(--fg-dim); }
.search-box input:focus { border-bottom-color: var(--line); }

.header-logo { position: absolute; left: 50%; transform: translateX(-50%); }
.header-logo img { width: 240px; height: auto; }

.lang-switch { display: flex; align-items: center; cursor: pointer; font-size: 14px; user-select: none; }
.lang-switch img { width: 14px; height: 7px; margin-left: 5px; }

/* 汉堡按钮（仅移动端显示） */
.hamburger {
  display: none;
  width: 28px; height: 22px;
  background: none; border: 0; cursor: pointer;
  position: relative; z-index: 210;
}
.hamburger span {
  display: block; width: 100%; height: 1.5px; background: #fff;
  margin: 5px 0; transition: transform .35s, opacity .35s;
}
.hamburger.active span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ---------- 桌面导航 ---------- */
.site-nav {
  display: flex; justify-content: center;
  gap: clamp(28px, 6vw, 85px);
  padding: 16px 24px 26px;
  border-top: 1px solid var(--line);
  font-size: 18px;
}
.nav-link { position: relative; text-align: center; }
.nav-link::after {
  content: ""; position: absolute; bottom: -8px; left: calc(50% - 15px);
  width: 30px; border-bottom: 1px solid #fff;
  opacity: 0; transition: opacity .3s;
}
.nav-link:hover::after, .nav-link.current::after { opacity: 1; }
.nav-title { font-size: 18px; }
.nav-text { font-size: 10px; font-family: var(--font-en); letter-spacing: 0.08em; color: var(--fg-dim); }

/* ---------- 移动端抽屉导航 ---------- */
.drawer-mask {
  position: fixed; inset: 0; z-index: 190;
  background: rgba(0,0,0,0.6);
  opacity: 0; visibility: hidden; transition: opacity .35s, visibility .35s;
}
.drawer-mask.open { opacity: 1; visibility: visible; }
.drawer {
  position: fixed; top: 0; right: 0; bottom: 0; z-index: 200;
  width: min(78vw, 320px);
  background: #0a0a0a;
  border-left: 1px solid rgba(255,255,255,0.12);
  transform: translateX(100%);
  transition: transform .38s cubic-bezier(.22,.61,.36,1);
  display: flex; flex-direction: column;
  padding: 90px 32px 40px;
  overflow-y: auto;
}
.drawer.open { transform: translateX(0); }
.drawer a {
  display: block; padding: 16px 0;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.drawer .d-title { font-size: 17px; }
.drawer .d-text { font-size: 10px; font-family: var(--font-en); letter-spacing: 0.12em; color: var(--fg-dim); }
.drawer-lang { margin-top: 28px; font-size: 14px; color: var(--fg-dim); cursor: pointer; }

/* ---------- 首页 Banner 轮播 ---------- */
.hero-carousel { position: relative; overflow: hidden; }
.hero-track { display: flex; transition: transform .7s cubic-bezier(.22,.61,.36,1); }
.hero-slide { min-width: 100%; position: relative; }
.hero-slide img { width: 100%; height: clamp(420px, 56vw, 813px); object-fit: cover; }
.hero-caption {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 0 24px;
  background: linear-gradient(to bottom, rgba(0,0,0,0.25), rgba(0,0,0,0.45));
}
.hero-caption .en { font-family: var(--font-en); font-size: clamp(14px, 2.4vw, 26px); letter-spacing: 0.35em; margin-bottom: 14px; }
.hero-caption .cn { font-size: clamp(22px, 4.5vw, 44px); letter-spacing: 0.45em; margin-right: -0.45em; }
.hero-dots { position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%); display: flex; gap: 12px; z-index: 5; }
.hero-dots button {
  width: 26px; height: 2px; border: 0; cursor: pointer;
  background: rgba(255,255,255,0.35); transition: background .3s;
}
.hero-dots button.on { background: #fff; }

/* ---------- 通用区块 ---------- */
.section { padding: clamp(56px, 9vw, 130px) 0; }
.section-head { text-align: center; margin-bottom: clamp(36px, 6vw, 80px); }
.section-head .en {
  font-family: var(--font-en);
  font-size: clamp(20px, 3.2vw, 34px);
  letter-spacing: 0.25em; text-transform: uppercase;
}
.section-head .cn { font-size: clamp(15px, 2vw, 20px); letter-spacing: 0.6em; margin-right: -0.6em; color: var(--fg-dim); margin-top: 8px; }
.section-head .desc { max-width: 720px; margin: 22px auto 0; font-size: 14px; color: var(--fg-dim); }

.tag-vertical {
  writing-mode: vertical-rl;
  font-family: var(--font-en);
  font-size: clamp(24px, 3.5vw, 48px);
  color: #464444;
  letter-spacing: 0.2em;
}

/* 首页：品牌宣言 */
.manifesto { display: flex; gap: clamp(24px, 5vw, 72px); align-items: stretch; }
.manifesto .tag-vertical { flex-shrink: 0; }
.manifesto-body { flex: 1; }
.manifesto-body p { color: var(--fg-dim); font-size: clamp(14px, 1.4vw, 16px); max-width: 760px; margin-bottom: 1.2em; }
.manifesto-body .big { color: #fff; font-size: clamp(20px, 3vw, 32px); letter-spacing: 0.2em; margin-bottom: 0.8em; }

/* 首页：系列入口卡片 */
.series-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: clamp(14px, 2.5vw, 32px);
}
.series-card { position: relative; overflow: hidden; display: block; }
.series-card img { width: 100%; aspect-ratio: 3/4; object-fit: cover; transition: transform .8s ease; }
.series-card:hover img { transform: scale(1.06); }
.series-card .veil {
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.75), rgba(0,0,0,0.05) 55%);
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: clamp(18px, 3vw, 34px);
}
.series-card .veil .cn { font-size: clamp(17px, 2vw, 24px); letter-spacing: 0.35em; }
.series-card .veil .en { font-family: var(--font-en); font-size: 11px; letter-spacing: 0.2em; color: var(--fg-dim); margin-top: 6px; text-transform: uppercase; }

/* 数字/特性条 */
.feature-strip {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.feature-cell { padding: clamp(28px, 4vw, 54px) 16px; text-align: center; }
.feature-cell + .feature-cell { border-left: 1px solid var(--line); }
.feature-cell .num { font-family: var(--font-en); font-size: clamp(24px, 3.4vw, 42px); }
.feature-cell .lbl { font-size: 13px; color: var(--fg-dim); letter-spacing: 0.2em; margin-top: 8px; }

/* ---------- 页面头图 ---------- */
.page-hero { position: relative; }
.page-hero img { width: 100%; height: clamp(280px, 42vw, 640px); object-fit: cover; }
.page-hero .cap {
  position: absolute; inset: 0; display: flex; flex-direction: column;
  align-items: center; justify-content: center; text-align: center;
  background: rgba(0,0,0,0.35); padding: 0 24px;
}
.page-hero .cap .en { font-family: var(--font-en); font-size: clamp(16px, 3vw, 32px); letter-spacing: 0.3em; text-transform: uppercase; }
.page-hero .cap .cn { font-size: clamp(18px, 3vw, 30px); letter-spacing: 0.5em; margin-right: -0.5em; margin-top: 10px; }

/* 标题行（仿原站 zjs-section-title-row） */
.title-row { display: flex; align-items: center; justify-content: space-between; margin-bottom: clamp(28px, 4vw, 56px); }
.title-row .main { font-family: var(--font-en); font-size: clamp(18px, 2.6vw, 28px); letter-spacing: 0.2em; }
.title-row .sub { font-size: 14px; color: var(--fg-dim); letter-spacing: 0.35em; margin-top: 4px; }
.title-row img { width: clamp(40px, 5vw, 64px); }

/* 视频占位 */
.video-frame {
  width: 100%; aspect-ratio: 16/9;
  background: #111 url("../img/banner-2.svg") center/cover;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid rgba(255,255,255,0.12);
}
.video-frame .play {
  width: clamp(56px, 8vw, 88px); height: clamp(56px, 8vw, 88px);
  border: 1px solid #fff; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: background .3s;
}
.video-frame .play:hover { background: rgba(255,255,255,0.12); }
.video-frame .play::before {
  content: ""; border-style: solid; border-width: 12px 0 12px 18px;
  border-color: transparent transparent transparent #fff; margin-left: 5px;
}

/* 图文并排 */
.split { display: grid; grid-template-columns: minmax(810px, 1fr) 410px; gap: 16px; align-items: start; }   /* 主图宽≥810可往右延伸，侧图固定右侧 */
.split > img { width: 100%; height: 600px; object-fit: cover; }   /* 主图 宽≥810可往右延伸，高600与侧图一致 */
.split .side > img { width: 100%; height: 600px; object-fit: cover; }   /* 侧图1 高 600px */
.split .side { display: grid; grid-template-rows: 1fr; gap: clamp(16px, 3vw, 40px); }   /* 仅保留一张侧图 */

.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: clamp(12px, 2vw, 24px); }
.grid-4 img { width: 100%; aspect-ratio: 1; object-fit: cover; }

/* ---------- 产品中心 ---------- */
.filter-bar {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: clamp(16px, 4vw, 56px);
  padding: clamp(20px, 3vw, 36px) 0;
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  margin-bottom: clamp(32px, 5vw, 64px);
}
.filter-bar button {
  background: none; border: 0; color: var(--fg-dim);
  font-family: var(--font-cn); font-size: clamp(14px, 1.6vw, 17px);
  letter-spacing: 0.25em; cursor: pointer; padding: 6px 2px;
  border-bottom: 1px solid transparent; transition: color .3s, border-color .3s;
}
.filter-bar button.on, .filter-bar button:hover { color: #fff; border-bottom-color: #fff; }

/* 产品中心：一行五个，卡片图 222×370 */
.product-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 222px));
  gap: clamp(18px, 2.5vw, 30px);
  justify-content: center;
  width: 100vw;                      /* 通栏，使五个 300px 卡片在宽屏居中展示 */
  margin-left: calc(50% - 50vw);
}
.product-card { display: block; }
.product-card .thumb { width: 100%; aspect-ratio: 3 / 5; overflow: hidden; }   /* 300:500 比例 */
.product-card img { width: 100%; height: 100%; aspect-ratio: 3 / 5; object-fit: cover; transition: transform .8s ease; }
.product-card:hover img { transform: scale(1.05); }
.product-card .name { margin-top: 14px; font-size: clamp(15px, 1.6vw, 18px); letter-spacing: 0.15em; }
.product-card .meta { font-size: 12px; color: var(--fg-dim); font-family: var(--font-en); letter-spacing: 0.12em; margin-top: 4px; text-transform: uppercase; }

.empty-tip { text-align: center; color: var(--fg-dim); padding: 80px 0; letter-spacing: 0.3em; }

/* 产品详情（新版：上信息+大图 / 下案例轮播） */
.detail-head { display: grid; grid-template-columns: 1.2fr 1fr; gap: clamp(24px, 5vw, 72px); align-items: start; }
.detail-head img { width: 100%; aspect-ratio: 4/5; object-fit: cover; }
.detail-info .kind { font-family: var(--font-en); font-size: 12px; letter-spacing: 0.25em; color: var(--fg-dim); text-transform: uppercase; }
.detail-info h1 { font-size: clamp(24px, 3.4vw, 40px); letter-spacing: 0.2em; margin: 14px 0 6px; font-weight: 300; }
.detail-info .en-name { font-family: var(--font-en); color: var(--fg-dim); letter-spacing: 0.2em; margin-bottom: 28px; }
.spec-table { border-top: 1px solid var(--line); }
.spec-table .row { display: flex; justify-content: space-between; gap: 20px; padding: 14px 2px; border-bottom: 1px solid rgba(255,255,255,0.14); font-size: 14px; }
.spec-table .row .k { color: var(--fg-dim); flex-shrink: 0; }
.detail-desc { margin-top: 28px; color: var(--fg-dim); font-size: 14px; }
.back-link { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--fg-dim); letter-spacing: 0.2em; margin-bottom: 26px; }
.back-link:hover { color: #fff; }

/* 产品详情 · 新版布局 */
.pd-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.pd-name { font-size: clamp(20px, 3vw, 30px); letter-spacing: 0.15em; }
.pd-code { font-family: var(--font-en); font-size: 13px; color: var(--fg-dim); letter-spacing: 0.2em; margin-left: 16px; text-transform: uppercase; }
.pd-cate { font-size: 14px; color: var(--fg-dim); letter-spacing: 0.25em; }
.pd-line { height: 1px; background: var(--line); margin: 16px 0 16px; }
.pd-spec { font-size: 13px; color: var(--fg-dim); letter-spacing: 0.12em; margin-bottom: clamp(22px, 3vw, 34px); }
.pd-cover { width: 100%; max-height: 80vh; object-fit: cover; }
.pd-desc { margin-top: 20px; font-size: 14px; color: var(--fg-dim); max-width: 900px; }
.pd-sec { margin-top: clamp(52px, 8vw, 100px); }
.pd-sec-title {
  font-size: clamp(16px, 2vw, 22px); letter-spacing: 0.3em;
  border-left: 2px solid #fff; padding-left: 16px;
  margin-bottom: clamp(24px, 4vw, 40px);
}
.g-carousel {
  position: relative; overflow: hidden;
  /* 占满屏幕宽度（突破容器限制） */
  width: 100vw; margin-left: calc(50% - 50vw);
}
.g-track { display: flex; transition: transform .7s cubic-bezier(.22,.61,.36,1); cursor: pointer; }
.g-slide { min-width: 100%; }
.g-slide img { width: 100%; height: 900px; object-fit: cover; display: block; }   /* 板材与施工案例图：固定高度 900px */
.g-dots { display: flex; justify-content: center; gap: 12px; margin-top: 24px; }
.g-dots button { width: 26px; height: 2px; border: 0; cursor: pointer; background: rgba(255,255,255,0.35); transition: background .3s; }
.g-dots button.on { background: #fff; }
.g-arrow {
  position: absolute; top: 50%; transform: translateY(-50%);
  z-index: 5; width: 52px; height: 52px;
  background: rgba(0,0,0,0.35); border: 1px solid rgba(255,255,255,0.4);
  color: #fff; cursor: pointer; transition: background .3s;
  display: flex; align-items: center; justify-content: center;
}
.g-arrow:hover { background: rgba(0,0,0,0.65); }
.g-arrow::before {
  content: ""; display: block; width: 12px; height: 12px;
  border-top: 1.5px solid #fff; border-right: 1.5px solid #fff;
}
.g-prev { left: clamp(10px, 3vw, 40px); }
.g-prev::before { transform: rotate(-135deg); margin-left: 5px; }
.g-next { right: clamp(10px, 3vw, 40px); }
.g-next::before { transform: rotate(45deg); margin-right: 5px; }
@media (max-width: 767px) {
  .g-arrow { width: 40px; height: 40px; }
  .g-slide img { height: clamp(260px, 66vw, 60vh); }
}

/* ---------- 案例 ---------- */
.case-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: clamp(16px, 3vw, 40px); }
.case-card { position: relative; overflow: hidden; display: block; }
.case-card img { width: 100%; aspect-ratio: 3/2; object-fit: cover; transition: transform .8s ease; }
.case-card:hover img { transform: scale(1.05); }
.case-card .veil {
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.72), transparent 55%);
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: clamp(16px, 2.6vw, 30px);
}
.case-card .cn { font-size: clamp(16px, 2vw, 22px); letter-spacing: 0.2em; }
.case-card .en { font-family: var(--font-en); font-size: 11px; letter-spacing: 0.18em; color: var(--fg-dim); margin-top: 4px; text-transform: uppercase; }

.case-detail-body img { width: 100%; margin: clamp(20px, 3vw, 40px) 0; }
.case-detail-body p { color: var(--fg-dim); font-size: 15px; max-width: 860px; }

/* ---------- 联系我们 ---------- */
.contact-info-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.contact-info-grid .cell { padding: clamp(24px, 4vw, 48px) 18px; }
.contact-info-grid .cell + .cell { border-left: 1px solid var(--line); }
.contact-info-grid .k { font-size: 13px; color: var(--fg-dim); letter-spacing: 0.3em; margin-bottom: 10px; }
.contact-info-grid .v { font-size: clamp(14px, 1.5vw, 17px); word-break: break-all; }

.contact-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 5vw, 80px); align-items: start; }
.map-placeholder {
  width: 100%; aspect-ratio: 4/3.4;
  background:
    linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px),
    #0d0d0f;
  background-size: 44px 44px;
  border: 1px solid rgba(255,255,255,0.14);
  position: relative;
  display: flex; align-items: center; justify-content: center;
}
.map-pin { text-align: center; }
.map-pin .dot { width: 14px; height: 14px; border-radius: 50%; background: #fff; margin: 0 auto 12px; box-shadow: 0 0 0 8px rgba(255,255,255,0.15); }
.map-pin .addr { font-size: 13px; color: var(--fg-dim); letter-spacing: 0.1em; padding: 0 20px; }

.msg-form .field { margin-bottom: 26px; }
.msg-form label { display: block; font-size: 14px; letter-spacing: 0.2em; margin-bottom: 10px; }
.msg-form input, .msg-form textarea {
  width: 100%; background: none; border: 0; outline: 0;
  border-bottom: 1px solid var(--line);
  color: #fff; font-size: 15px; font-family: var(--font-cn);
  padding: 8px 2px; transition: border-color .3s; resize: vertical;
}
.msg-form input:focus, .msg-form textarea:focus { border-bottom-color: #fff; }
.msg-form textarea { min-height: 110px; }
.msg-form .tip { font-size: 13px; color: var(--fg-dim); margin-bottom: 28px; }
.btn-send {
  background: none; border: 1px solid #fff; color: #fff;
  font-family: var(--font-cn); font-size: 15px; letter-spacing: 0.6em; margin-right: -0.6em;
  padding: 13px 54px; cursor: pointer; transition: background .3s, color .3s;
}
.btn-send:hover { background: #fff; color: #000; }
.toast {
  position: fixed; top: 90px; left: 50%; transform: translateX(-50%) translateY(-12px);
  background: #fff; color: #000; padding: 10px 34px; font-size: 14px;
  letter-spacing: 0.15em; z-index: 500; opacity: 0; visibility: hidden;
  transition: opacity .3s, transform .3s, visibility .3s;
}
.toast.show { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }

/* ---------- 页脚 ---------- */
.site-footer { border-top: 1px solid rgba(255,255,255,0.14); }
.footer-inner {
  max-width: var(--maxw); margin: 0 auto;
  padding: clamp(48px, 7vw, 84px) 24px 0;
  display: grid; grid-template-columns: 1.3fr 2fr 1.5fr;
  column-gap: clamp(28px, 5vw, 60px);
}
.footer-logo img { width: 157px; cursor: pointer; }
.footer-cols { display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.footer-col { min-width: 110px; }
.footer-col .t { margin-bottom: 14px; font-size: 15px; letter-spacing: 0.15em; cursor: pointer; }
.footer-col a { display: block; margin-bottom: 12px; font-size: 13px; color: var(--fg-dim); }
.footer-col a:hover { color: #fff; }
.footer-qrcodes { display: flex; justify-content: flex-end; align-items: flex-start; gap: clamp(16px, 2.5vw, 32px); }
.footer-qrcodes .txt { font-size: 13px; color: var(--fg-dim); letter-spacing: 0.12em; }
.footer-qrcodes .txt .t { color: #fff; margin-bottom: 6px; font-size: 14px; }
.footer-qrcodes img { width: 76px; height: 76px; background: #fff; padding: 4px; }

.footer-demand {
  max-width: var(--maxw); margin: 36px auto 0; padding: 0 24px;
}
.footer-demand a {
  display: inline-flex; width: 220px; max-width: 100%;
  align-items: center; justify-content: space-between;
  font-size: 14px; letter-spacing: 0.2em;
  border-bottom: 1px solid #fff; padding-bottom: 8px;
}
.footer-demand img { width: 12px; height: 17px; }

.footer-bottom { max-width: var(--maxw); margin: clamp(44px, 6vw, 74px) auto 0; padding: 0 24px 38px; font-size: 12px; }
.footer-bottom .row { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.footer-bottom .phone { font-size: clamp(22px, 3vw, 32px); font-family: var(--font-en); letter-spacing: 0.05em; }
.footer-bottom .info, .footer-bottom .base { font-size: 13px; color: var(--fg-dim); }
.footer-bottom .line { height: 1px; background: #fff; margin: 18px 0 10px; }
.footer-bottom .copy { text-align: center; color: var(--fg-dim); letter-spacing: 0.08em; }

/* ============================================================
   响应式 —— 平板
   ============================================================ */
@media (max-width: 1199px) {
  .header-logo img { width: 200px; }
  .product-grid { grid-template-columns: repeat(3, minmax(0, 222px)); }   /* 平板：三个一排 */
}

/* ============================================================
   响应式 —— 手机（核心自适应）
   ============================================================ */
@media (max-width: 767px) {
  .site-header { padding: 16px 20px 14px; }
  .header-left { width: auto; }
  .header-right { width: auto; }
  .search-box input { display: none; }            /* 手机上收起搜索框，仅保留图标入口 */
  .search-box input.mobile-open {
    display: block; position: absolute; left: 0; top: 100%;
    width: calc(100vw - 40px); margin-top: 6px;
    background: #111; padding: 10px 12px;
    border: 1px solid var(--line); z-index: 60;
  }
  .header-logo { position: static; transform: none; }
  .header-logo img { width: 132px; }
  .site-header { gap: 12px; }
  .lang-switch { display: none; }                 /* 语言切换移入抽屉 */
  .hamburger { display: block; }
  .site-nav { display: none; }                    /* 横排导航换成抽屉 */

  .series-grid { grid-template-columns: 1fr; }
  .series-card img { aspect-ratio: 16/10; }
  .feature-strip { grid-template-columns: repeat(2, 1fr); }
  .feature-cell:nth-child(3) { border-left: 0; }
  .feature-cell:nth-child(n+3) { border-top: 1px solid var(--line); }

  .split { grid-template-columns: 1fr; }
  .split > img { width: 100%; aspect-ratio: 810 / 600; height: auto; object-fit: cover; }   /* 手机端主图按比例自适应 */
  .split .side > img { height: auto; }   /* 侧图1 自适应原始比例 */
  .split .side { grid-template-rows: none; grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }

  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .case-grid { grid-template-columns: 1fr; }
  .detail-head { grid-template-columns: 1fr; }

  .contact-info-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-info-grid .cell:nth-child(3) { border-left: 0; }
  .contact-info-grid .cell:nth-child(n+3) { border-top: 1px solid var(--line); }
  .contact-wrap { grid-template-columns: 1fr; }

  .footer-inner { grid-template-columns: 1fr; row-gap: 36px; }
  .footer-qrcodes { justify-content: flex-start; }
  .footer-bottom .row { flex-direction: column; align-items: flex-start; gap: 10px; }
}

@media (max-width: 420px) {
  .product-grid { grid-template-columns: 1fr; }
  .contact-info-grid { grid-template-columns: 1fr; }
  .contact-info-grid .cell + .cell { border-left: 0; }
  .contact-info-grid .cell:nth-child(n+2) { border-top: 1px solid var(--line); }
}

/* 减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}