/* ==========================================================================
   安庆腾翎新材料有限公司 · 企业官网样式表
   分区：1 变量 / 2 重置 / 3 基础 / 4 布局 / 5 按钮 / 6 头部导航
        7 首屏轮播 / 8 区块与卡片 / 9 规格表 / 10 图集与灯箱
        11 页头横幅 / 12 数据与特性 / 13 CTA / 14 页脚与移动栏
        15 动效与占位 / 16 响应式
   ========================================================================== */

/* 1. 变量 ---------------------------------------------------------------- */
:root {
  --primary: #0a2a52;
  --primary-2: #0e3a6b;
  --primary-3: #124a87;
  --accent: #1e7bd6;
  --silver: #c7cdd6;
  --silver-dark: #8a94a6;
  --text: #16202e;
  --muted: #5a6675;
  --bg: #ffffff;
  --bg-tint: #f4f7fb;
  --line: #e3e9f2;
  --container: 1200px;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow: 0 8px 28px rgba(10, 42, 82, 0.08);
  --shadow-lg: 0 18px 44px rgba(10, 42, 82, 0.16);
  --section-y: 80px;
  --font-cn: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB",
    "Source Han Sans SC", "Noto Sans SC", sans-serif;
  --font-num: "Segoe UI", Arial, sans-serif;
}

/* 2. 重置 ---------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

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

h1,
h2,
h3,
h4,
p,
ul,
ol,
dl,
figure,
blockquote {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

table {
  border-collapse: collapse;
  width: 100%;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

/* 3. 基础 ---------------------------------------------------------------- */
html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.25s ease;
}

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

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 999;
  padding: 12px 20px;
  background: var(--primary);
  color: #fff;
}

.skip-link:focus {
  left: 16px;
  top: 16px;
}

.num {
  font-family: var(--font-num);
  font-weight: 700;
  letter-spacing: 0.5px;
}

/* 4. 布局 ---------------------------------------------------------------- */
.container {
  width: min(100% - 40px, var(--container));
  margin-inline: auto;
}

.section {
  padding-block: var(--section-y);
}

.section--tint {
  background: var(--bg-tint);
}

.section--dark {
  background: var(--primary);
  color: #fff;
}

.section__head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 48px;
}

.section__title {
  font-size: clamp(24px, 2.6vw, 34px);
  line-height: 1.35;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 0.5px;
}

.section--dark .section__title {
  color: #fff;
}

.section__title::after {
  content: "";
  display: block;
  width: 56px;
  height: 3px;
  margin: 18px auto 0;
  background: linear-gradient(90deg, var(--accent), var(--silver));
  border-radius: 3px;
}

.section__sub {
  margin-top: 16px;
  color: var(--muted);
  font-size: 15px;
}

.section--dark .section__sub {
  color: rgba(255, 255, 255, 0.72);
}

.grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

/* 网格子项默认 min-width:auto，长中文标题会撑破列宽并造成整页横向溢出 */
.grid > * {
  min-width: 0;
}

.grid--2 {
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

/* 联系方式三张卡片：一行三列（R11） */
.grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

/* 图文两栏：文字相对图片垂直居中，避免文字贴顶（R8） */
.grid--middle {
  align-items: center;
}

.grid--4 {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.prose p {
  margin-bottom: 18px;
  color: var(--text);
  text-align: justify;
}

.prose p:last-child {
  margin-bottom: 0;
}

.prose--lead p:first-child {
  font-size: 17px;
  color: var(--primary-2);
}

/* 5. 按钮 ---------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease,
    color 0.25s ease, border-color 0.25s ease;
}

.btn--primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 10px 24px rgba(30, 123, 214, 0.32);
}

.btn--primary:hover {
  background: #1668b8;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(30, 123, 214, 0.38);
}

.btn--ghost {
  border: 1px solid rgba(255, 255, 255, 0.7);
  color: #fff;
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
  transform: translateY(-2px);
}

.btn--outline {
  border: 1px solid var(--line);
  color: var(--primary);
  background: #fff;
}

.btn--outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.link-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
}

.link-more::after {
  content: "→";
  transition: transform 0.25s ease;
}

.link-more:hover::after {
  transform: translateX(4px);
}

/* 6. 头部与导航 ---------------------------------------------------------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 90;
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 78px;
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 6px 24px rgba(10, 42, 82, 0.1);
  backdrop-filter: blur(6px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand__mark {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand__name {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 1px;
  color: #fff;
}

.brand__en {
  font-family: var(--font-num);
  font-size: 10px;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.68);
}

.site-header.is-scrolled .brand__name {
  color: var(--primary);
}

.site-header.is-scrolled .brand__en {
  color: var(--silver-dark);
}

.nav {
  margin-left: auto;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav__link {
  display: block;
  padding: 10px 16px;
  border-radius: 999px;
  font-size: 15px;
  color: rgba(255, 255, 255, 0.88);
  position: relative;
}

.nav__link:hover,
.nav__link[aria-current="page"] {
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
}

.site-header.is-scrolled .nav__link {
  color: var(--text);
}

.site-header.is-scrolled .nav__link:hover,
.site-header.is-scrolled .nav__link[aria-current="page"] {
  color: var(--accent);
  background: rgba(30, 123, 214, 0.08);
}

.header-tel {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
  font-family: var(--font-num);
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
}

.header-tel:hover {
  background: var(--accent);
  color: #fff;
}

.site-header.is-scrolled .header-tel {
  background: var(--primary);
  color: #fff;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  margin-left: auto;
  background: rgba(255, 255, 255, 0.14);
  padding: 12px 11px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: #fff;
  border-radius: 2px;
}

.nav-toggle span + span {
  margin-top: 5px;
}

.site-header.is-scrolled .nav-toggle {
  background: rgba(10, 42, 82, 0.08);
}

.site-header.is-scrolled .nav-toggle span {
  background: var(--primary);
}

.drawer {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 95;
  width: min(84vw, 340px);
  height: 100%;
  padding: 96px 28px 32px;
  background: #fff;
  box-shadow: var(--shadow-lg);
  transform: translateX(100%);
  transition: transform 0.32s ease;
  overflow-y: auto;
}

.drawer.is-open {
  transform: none;
}

.drawer__list li + li {
  border-top: 1px solid var(--line);
}

.drawer__list a {
  display: block;
  padding: 16px 4px;
  font-size: 16px;
  color: var(--primary);
}

.drawer__list a[aria-current="page"] {
  color: var(--accent);
  font-weight: 700;
}

.drawer__foot {
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.drawer__foot .num {
  display: block;
  margin-top: 6px;
  font-size: 20px;
  color: var(--primary);
}

.drawer-mask {
  position: fixed;
  inset: 0;
  z-index: 94;
  background: rgba(10, 42, 82, 0.48);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.drawer-mask.is-open {
  opacity: 1;
  visibility: visible;
}

body.is-locked {
  overflow: hidden;
}

/* 7. 首屏轮播 ------------------------------------------------------------ */
.hero {
  position: relative;
  min-height: clamp(520px, 76vh, 760px);
  background: var(--primary);
  overflow: hidden;
}

.hero__track {
  position: absolute;
  inset: 0;
}

.hero__slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.9s ease, visibility 0.9s ease;
}

.hero__slide.is-active {
  opacity: 1;
  visibility: visible;
}

.hero__media {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.04);
  transition: transform 7s linear;
}

.hero__slide.is-active .hero__media {
  transform: scale(1.12);
}

.hero__slide::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    100deg,
    rgba(6, 25, 49, 0.92) 6%,
    rgba(8, 33, 63, 0.74) 42%,
    rgba(8, 33, 63, 0.24) 100%
  );
}

.hero__inner {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: clamp(520px, 76vh, 760px);
  padding-block: 120px 96px;
  color: #fff;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  align-self: flex-start;
  padding: 8px 18px;
  border: 1px solid rgba(255, 255, 255, 0.34);
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: 1px;
  color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(4px);
}

.hero__title {
  max-width: 16em;
  margin-top: 26px;
  font-size: clamp(30px, 4.6vw, 58px);
  line-height: 1.22;
  font-weight: 700;
  letter-spacing: 1px;
}

.hero__sub {
  max-width: 34em;
  margin-top: 22px;
  font-size: clamp(15px, 1.4vw, 18px);
  color: rgba(255, 255, 255, 0.86);
}

.hero__actions {
  margin-top: 38px;
}

.hero__metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  margin-top: 56px;
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.hero__metric b {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(24px, 2.6vw, 34px);
  line-height: 1.1;
  color: #fff;
}

/* 只作用于标签本身；数值里的 span 必须继续继承 b 的字号 */
.hero__metric > span {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.72);
}

.hero__nav {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 34px;
  z-index: 3;
}

.hero__nav-inner {
  display: flex;
  align-items: center;
  gap: 20px;
}

.hero__dots {
  display: flex;
  gap: 10px;
}

.hero__dot {
  width: 34px;
  height: 4px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.36);
  transition: background 0.3s ease, width 0.3s ease;
}

.hero__dot.is-active {
  width: 56px;
  background: var(--accent);
}

.hero__arrows {
  display: flex;
  gap: 10px;
  margin-left: auto;
}

.hero__arrow {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.4);
  color: #fff;
  font-size: 18px;
  display: grid;
  place-items: center;
  transition: background 0.25s ease, border-color 0.25s ease;
}

.hero__arrow:hover {
  background: var(--accent);
  border-color: var(--accent);
}

/* 8. 区块与卡片 ---------------------------------------------------------- */
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(30, 123, 214, 0.32);
}

.card__media {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: var(--bg-tint);
}

.card__body {
  padding: 24px 24px 28px;
}

.card__title {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary);
}

.card__desc {
  margin-top: 10px;
  font-size: 15px;
  color: var(--muted);
}

.feature {
  display: flex;
  gap: 16px;
  padding: 26px 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
}

.feature__num {
  font-family: var(--font-num);
  font-size: 22px;
  font-weight: 700;
  color: var(--silver);
}

.feature__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--primary);
}

.feature__desc {
  margin-top: 8px;
  font-size: 14px;
  color: var(--muted);
}

/* 首页「产品五大核心特性」编号轨道版式（R1） */
.feat-rail {
  position: relative;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 24px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.feat-rail::before {
  content: "";
  position: absolute;
  left: 6%;
  right: 6%;
  top: 21px;
  height: 1px;
  background: var(--line);
}

.feat-rail__item {
  position: relative;
  min-width: 0;
}

.feat-rail__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: #fff;
  border: 1px solid var(--line);
  color: var(--primary);
  font-family: var(--font-num);
  font-size: 14px;
  font-weight: 700;
  transition: border-color 0.28s ease, color 0.28s ease, box-shadow 0.28s ease;
}

/* 首个编号默认高亮：双层模糊投影，边缘自然渐隐 */
.feat-rail__item:first-child .feat-rail__num {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 7px 1px rgba(30, 123, 214, 0.16), 0 0 18px 6px rgba(30, 123, 214, 0.1);
}

/* 鼠标进入轨道后，默认高亮让位，保证同一时刻只亮一个 */
.feat-rail:hover .feat-rail__item:first-child:not(:hover) .feat-rail__num {
  border-color: var(--line);
  color: var(--primary);
  box-shadow: none;
}

/* 悬停项：同款渐隐光晕，强度略高一档 */
.feat-rail__item:hover .feat-rail__num {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 9px 2px rgba(30, 123, 214, 0.22), 0 0 24px 9px rgba(30, 123, 214, 0.15);
}

.feat-rail__title {
  margin: 16px 0 8px;
  font-size: 17px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--primary);
  transition: color 0.28s ease;
}

.feat-rail__item:hover .feat-rail__title {
  color: var(--accent);
}

.feat-rail__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}

.split--reverse .split__media {
  order: 2;
}

.split__media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.split__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

.split__title {
  font-size: clamp(22px, 2.4vw, 30px);
  color: var(--primary);
  font-weight: 700;
}

.split__body {
  margin-top: 20px;
}

/* 首页「关于腾翎新材料」重排（R3）：图片放大顶对齐 · 数字贴图片底 · 通栏按钮 */
.split--about {
  grid-template-columns: 1.12fr 1fr;
  align-items: stretch;
  gap: 48px;
}

.split--about .split__media {
  position: relative;
  min-height: 380px;
  box-shadow: 0 14px 34px rgba(10, 42, 82, 0.18);
}

.split--about .split__media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: auto;
}

.split--about__body {
  display: flex;
  flex-direction: column;
}

.split--about .stats {
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: auto;
  padding-top: 28px;
}

.split--about .stat {
  padding: 16px 14px;
}

.split--about .stat__value {
  font-size: 26px;
}

.split--about .stat__label {
  margin-top: 4px;
  font-size: 12px;
}

.about-cta {
  display: flex;
  justify-content: center;
  grid-column: 1 / -1;
  margin-top: 36px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
  margin-top: 36px;
}

.stat {
  padding: 22px 20px;
  border-radius: var(--radius);
  background: var(--bg-tint);
  text-align: center;
}

.stat__value {
  font-family: var(--font-num);
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 700;
  color: var(--accent);
  line-height: 1.1;
}

.stat__label {
  margin-top: 8px;
  font-size: 14px;
  color: var(--muted);
}

.product-card .card__media {
  aspect-ratio: 16 / 11;
}

.spec-list {
  margin-top: 16px;
  border-top: 1px dashed var(--line);
}

.spec-list li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  font-size: 14px;
  border-bottom: 1px dashed var(--line);
}

.spec-list dt,
.spec-list span:first-child {
  color: var(--muted);
}

.spec-list b {
  font-family: var(--font-num);
  color: var(--primary);
}

.pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.pill {
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(30, 123, 214, 0.09);
  color: var(--accent);
  font-size: 13px;
}

.checklist li {
  position: relative;
  padding-left: 30px;
  margin-bottom: 12px;
  color: var(--muted);
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--primary-3));
}

/* 9. 规格表 -------------------------------------------------------------- */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  background: #fff;
  border: 1px solid var(--line);
}

.spec-table {
  min-width: 720px;
  font-size: 15px;
}

.spec-table caption {
  padding: 18px 20px;
  text-align: left;
  font-weight: 700;
  color: var(--primary);
  background: var(--bg-tint);
  border-bottom: 1px solid var(--line);
}

.spec-table th,
.spec-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--line);
}

.spec-table thead th {
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  white-space: nowrap;
}

.spec-table tbody tr:nth-child(even) {
  background: #fafcff;
}

.spec-table tbody tr:hover {
  background: rgba(30, 123, 214, 0.06);
}

.spec-table td.num,
.spec-table th.num {
  font-family: var(--font-num);
}

.spec-table tbody th {
  color: var(--primary);
  font-weight: 700;
  white-space: nowrap;
}

/* 10. 图集与灯箱 --------------------------------------------------------- */
.gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.gallery__item {
  position: relative;
  display: block;
  width: 100%;
  padding: 0;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--bg-tint);
}

.gallery__item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.gallery__item:hover img {
  transform: scale(1.07);
}

.gallery__item figcaption,
.gallery__caption {
  position: absolute;
  inset: auto 0 0 0;
  padding: 22px 16px 12px;
  background: linear-gradient(transparent, rgba(6, 25, 49, 0.82));
  color: #fff;
  font-size: 14px;
  text-align: left;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: grid;
  place-items: center;
  padding: 40px 20px;
  background: rgba(6, 20, 40, 0.92);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.lightbox.is-open {
  opacity: 1;
  visibility: visible;
}

.lightbox img {
  max-width: min(1100px, 92vw);
  max-height: 82vh;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
}

.lightbox__close {
  position: absolute;
  top: 24px;
  right: 24px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
  font-size: 20px;
}

.lightbox__close:hover {
  background: var(--accent);
}

.lightbox__caption {
  margin-top: 16px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 14px;
  text-align: center;
}

/* 11. 页头横幅与面包屑 --------------------------------------------------- */
.page-hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: 320px;
  padding-block: 130px 44px;
  color: #fff;
  background: var(--primary);
  overflow: hidden;
}

.page-hero__media {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    100deg,
    rgba(6, 25, 49, 0.92),
    rgba(8, 33, 63, 0.62)
  );
}

.page-hero__inner {
  position: relative;
  z-index: 2;
}

.page-hero__title {
  font-size: clamp(26px, 3.2vw, 40px);
  font-weight: 700;
  letter-spacing: 1px;
}

.page-hero__sub {
  margin-top: 14px;
  max-width: 60em;
  color: rgba(255, 255, 255, 0.82);
  font-size: 15px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.72);
}

.breadcrumb a:hover {
  color: #fff;
}

.breadcrumb li::after {
  content: "/";
  margin-left: 8px;
  color: rgba(255, 255, 255, 0.42);
}

.breadcrumb li:last-child::after {
  content: "";
}

/* 12. 数据、理念与场景 --------------------------------------------------- */

.philosophy {
  padding: 30px 26px;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  box-shadow: var(--shadow);
}

.philosophy__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--primary);
}

.philosophy__desc {
  margin-top: 10px;
  font-size: 14px;
  color: var(--muted);
}

.scenario {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #fff;
  box-shadow: var(--shadow);
}

/* 四张场景卡等高：fr 行高让每张卡片与最高的一张对齐 */
.scenario-list {
  display: grid;
  gap: 28px;
  grid-auto-rows: 1fr;
}

/* 保持「01 图右／02 图左／03 图右／04 图左」的交替节奏 */
.scenario-list .scenario:nth-child(odd) .scenario__media {
  order: 2;
}

/* 图片绝对定位填满容器，避免竖构图照片把卡片顶高 */
.scenario__media {
  position: relative;
  min-height: 300px;
}

.scenario__media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.scenario__body {
  padding: 34px 36px;
}

.scenario__index {
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--silver-dark);
}

.scenario__title {
  margin-top: 8px;
  font-size: 21px;
  font-weight: 700;
  color: var(--primary);
}

.scenario__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 22px;
}

.scenario__label {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.5px;
}

.scenario__text {
  margin-top: 8px;
  font-size: 14px;
  color: var(--muted);
}

/* 13. CTA 区块 ----------------------------------------------------------- */
.cta {
  position: relative;
  padding-block: 64px;
  background: linear-gradient(120deg, var(--primary) 0%, var(--primary-3) 100%);
  color: #fff;
  overflow: hidden;
}

.cta::after {
  content: "";
  position: absolute;
  right: -80px;
  top: -80px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  border: 46px solid rgba(255, 255, 255, 0.06);
}

.cta__inner {
  position: relative;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.cta__title {
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 700;
}

.cta__sub {
  margin-top: 10px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 15px;
}

/* 14. 页脚与移动栏 ------------------------------------------------------- */
.site-footer {
  background: #071b34;
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
}

.site-footer__top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.1fr;
  gap: 40px;
  padding-block: 64px 48px;
}

.site-footer__title {
  margin-bottom: 18px;
  font-size: 15px;
  font-weight: 700;
  color: #fff;
}

.site-footer__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.site-footer__brand .brand__name {
  color: #fff;
}

.site-footer__brand .brand__en {
  color: rgba(255, 255, 255, 0.5);
}

.site-footer__list li + li {
  margin-top: 10px;
}

.site-footer__list a:hover {
  color: #fff;
}

.site-footer__contact li {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
}

.site-footer__contact b {
  color: #fff;
  font-weight: 600;
}

.qr {
  display: flex;
  gap: 18px;
  align-items: flex-start;
}

.qr__box {
  width: 108px;
  height: 108px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px dashed rgba(255, 255, 255, 0.28);
  display: grid;
  place-items: center;
  text-align: center;
  padding: 8px;
  font-size: 12px;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.6);
}

.site-footer__bottom {
  padding-block: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: space-between;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.56);
}

.site-footer__bottom a:hover {
  color: #fff;
}

.mobile-bar {
  display: none;
}

.backtop {
  position: fixed;
  right: 24px;
  bottom: 32px;
  z-index: 80;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  box-shadow: var(--shadow-lg);
  display: grid;
  place-items: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease,
    background 0.3s ease;
}

.backtop.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.backtop:hover {
  background: var(--accent);
}

/* 15. 动效与占位 --------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.placeholder-tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 6px;
  background: #fff4e5;
  border: 1px solid #ffd8a8;
  color: #b35309;
  font-size: 13px;
  line-height: 1.6;
}

.notice {
  display: flex;
  gap: 12px;
  padding: 16px 18px;
  border-radius: var(--radius);
  background: #fff8ee;
  border: 1px solid #ffe0b8;
  color: #8a5210;
  font-size: 14px;
}

.form-success {
  margin-top: 16px;
  padding: 14px 18px;
  border-radius: var(--radius);
  background: #e9f7ee;
  border: 1px solid #b7e3c6;
  color: #1d6a3c;
  font-size: 14px;
}

.contact-card {
  padding: 30px 28px;
  border-radius: var(--radius-lg);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.contact-card__label {
  font-size: 13px;
  letter-spacing: 1px;
  color: var(--silver-dark);
}

.contact-card__value {
  margin-top: 10px;
  font-size: 17px;
  color: var(--primary);
  font-weight: 600;
  word-break: break-all;
}

/* 公司位置：百度地图静态图＋地址信息（R12，方案 C） */
.map-embed {
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: var(--shadow);
}

.map-embed__media {
  display: block;
  background: var(--bg-tint);
}

.map-embed__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.map-embed__info {
  padding: 24px 28px 26px;
  border-top: 1px solid var(--line);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field--full {
  grid-column: 1 / -1;
}

.field label {
  font-size: 14px;
  color: var(--primary);
  font-weight: 600;
}

.field input,
.field textarea {
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font: inherit;
  color: var(--text);
  background: #fff;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.field input:focus,
.field textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(30, 123, 214, 0.15);
  outline: none;
}

.field textarea {
  min-height: 132px;
  resize: vertical;
}

.field .error {
  color: #c0392b;
  font-size: 13px;
}

.field.has-error input,
.field.has-error textarea {
  border-color: #e3917f;
}

.info-table th,
.info-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  font-size: 15px;
}

.info-table th {
  width: 190px;
  color: var(--primary);
  font-weight: 600;
  background: var(--bg-tint);
  white-space: nowrap;
}

/* 16. 响应式 ------------------------------------------------------------- */
@media (max-width: 1200px) {
  .site-footer__top {
    grid-template-columns: 1.3fr 1fr 1fr;
  }
  .site-footer__brand-col {
    grid-column: 1 / -1;
  }
}

@media (max-width: 991px) {
  :root {
    --section-y: 64px;
  }

  .nav,
  .header-tel {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  .split {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .split--reverse .split__media {
    order: 0;
  }

  .grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .scenario {
    grid-template-columns: 1fr;
  }

  .scenario-list .scenario:nth-child(odd) .scenario__media {
    order: 0;
  }

  .hero__inner {
    padding-block: 120px 92px;
  }

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

  .feat-rail::before {
    display: none;
  }

  .split--about .split__media {
    min-height: 300px;
  }

  .split--about__body {
    display: block;
  }

  .split--about .stats {
    margin-top: 32px;
    padding-top: 0;
  }
}

@media (max-width: 767px) {
  :root {
    --section-y: 48px;
  }

  body {
    font-size: 15px;
    padding-bottom: 62px;
  }

  .container {
    width: min(100% - 32px, var(--container));
  }

  .brand__mark {
    width: 38px;
    height: 38px;
  }

  .brand__name {
    font-size: 16px;
  }

  .brand__en {
    font-size: 9px;
    letter-spacing: 1px;
  }

  .site-header__inner {
    min-height: 64px;
  }

  .hero {
    min-height: 560px;
  }

  .hero__inner {
    min-height: 560px;
    padding-block: 108px 132px;
  }

  .hero__metrics {
    gap: 24px;
    margin-top: 34px;
  }

  .hero__nav {
    bottom: 84px;
  }

  .hero__arrows {
    display: none;
  }

  .section__head {
    margin-bottom: 32px;
  }

  .grid {
    gap: 18px;
  }

  .feature {
    flex-direction: column;
    gap: 6px;
    padding: 20px 18px;
  }

  .feature__num {
    font-size: 18px;
  }

  /* 规格表在窄屏转为卡片式 */
  .table-wrap {
    overflow: visible;
    border: 0;
    box-shadow: none;
    background: transparent;
  }

  .spec-table {
    min-width: 0;
  }

  .spec-table caption {
    border-radius: var(--radius);
    border: 1px solid var(--line);
    margin-bottom: 14px;
  }

  .spec-table thead {
    display: none;
  }

  .spec-table tbody tr {
    display: block;
    margin-bottom: 14px;
    padding: 16px 18px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: #fff;
    box-shadow: var(--shadow);
  }

  .spec-table tbody th {
    display: block;
    padding: 0 0 12px;
    font-size: 17px;
    border-bottom: 1px solid var(--line);
  }

  .spec-table tbody td {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 9px 0;
    border-bottom: 1px dashed var(--line);
    text-align: right;
  }

  .spec-table tbody td:last-child {
    border-bottom: 0;
  }

  .spec-table tbody td::before {
    content: attr(data-label);
    color: var(--muted);
    text-align: left;
    font-family: var(--font-cn);
  }

  .gallery {
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 12px;
  }

  .scenario__body {
    padding: 24px 22px 28px;
  }

  .cta__inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-footer__top {
    grid-template-columns: 1fr;
    gap: 30px;
    padding-block: 44px 32px;
  }

  .info-table th {
    width: auto;
  }

  .info-table th,
  .info-table td {
    display: block;
    width: 100%;
  }

  .info-table th {
    border-bottom: 0;
    padding-bottom: 6px;
  }

  .info-table td {
    padding-top: 0;
  }

  .backtop {
    right: 14px;
    bottom: 76px;
    width: 42px;
    height: 42px;
  }

  .mobile-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    position: fixed;
    inset: auto 0 0 0;
    z-index: 85;
    background: #fff;
    border-top: 1px solid var(--line);
    box-shadow: 0 -6px 20px rgba(10, 42, 82, 0.08);
  }

  .mobile-bar a {
    display: grid;
    gap: 2px;
    place-items: center;
    padding: 9px 4px 10px;
    font-size: 12px;
    color: var(--muted);
  }

  .mobile-bar a b {
    font-size: 17px;
    line-height: 1;
    font-weight: 400;
  }

  .mobile-bar a.is-strong {
    color: #fff;
    background: var(--accent);
  }
}

@media (max-width: 479px) {
  .hero__title {
    font-size: 27px;
  }

  .hero__badge {
    font-size: 12px;
  }

  .grid--4,
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid--3 {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .feat-rail {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .btn {
    padding: 12px 22px;
    font-size: 14px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }

  .hero__media,
  .hero__slide.is-active .hero__media {
    transform: none;
  }
}

@media print {
  .site-header,
  .mobile-bar,
  .backtop,
  .hero__nav {
    display: none !important;
  }
}