/* =========================================================
   内蒙古晟坤泰贸易有限公司 - 包钢一级代理
   主样式表 v1.0
   ========================================================= */

/* -------- 变量 -------- */
:root {
  --c-primary: #1a3a6c;        /* 深蓝主色 */
  --c-primary-dark: #11264a;
  --c-primary-light: #2a5298;
  --c-accent: #c8102e;          /* 红 - 取自Logo红日 */
  --c-accent-dark: #9a0c23;
  --c-gold: #c9a45a;            /* 金 - 装饰/分隔 */
  --c-text: #1f2937;
  --c-text-2: #4b5563;
  --c-text-3: #6b7280;
  --c-bg: #ffffff;
  --c-bg-alt: #f5f7fb;
  --c-bg-dark: #0f1d36;
  --c-border: #e3e7ee;
  --shadow-sm: 0 2px 6px rgba(26, 58, 108, .06);
  --shadow-md: 0 8px 24px rgba(26, 58, 108, .10);
  --shadow-lg: 0 16px 40px rgba(26, 58, 108, .15);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --container: 1200px;
  --easing: cubic-bezier(.4, 0, .2, 1);
}

/* -------- 基础重置 -------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

/* -------- 通用工具 -------- */
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.muted { color: var(--c-text-3); }
.center { text-align: center; }

/* -------- 顶部联系条 -------- */
.topbar {
  background: var(--c-bg-dark);
  color: rgba(255,255,255,.85);
  font-size: 13px;
  padding: 8px 0;
}
.topbar .container {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  flex-wrap: wrap;
}
.topbar a { color: rgba(255,255,255,.9); transition: color .2s var(--easing); }
.topbar a:hover { color: var(--c-gold); }
.topbar-info { display: flex; gap: 24px; flex-wrap: wrap; }
.topbar-info span::before { content: "· "; opacity: .5; }
.topbar-info span:first-child::before { content: ""; }
.topbar-info .ico { color: var(--c-gold); margin-right: 4px; }

/* -------- 主导航 -------- */
.navbar {
  background: #fff;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 3px solid var(--c-accent);
}
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 24px;
}
.nav-brand { display: flex; align-items: center; gap: 12px; }
.nav-brand .logo { width: 44px; height: 44px; }
.nav-brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.nav-brand-cn { font-size: 18px; font-weight: 700; color: var(--c-primary); letter-spacing: .5px; }
.nav-brand-en { font-size: 11px; color: var(--c-text-3); letter-spacing: .5px; }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0; padding: 0;
}
.nav-menu a {
  display: block;
  padding: 10px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--c-text);
  border-radius: var(--radius-sm);
  position: relative;
  transition: color .2s var(--easing);
}
.nav-menu a:hover { color: var(--c-primary); }
.nav-menu a.active {
  color: var(--c-primary);
  font-weight: 700;
}
.nav-menu a.active::after {
  content: "";
  position: absolute;
  left: 16px; right: 16px; bottom: 4px;
  height: 2px;
  background: var(--c-accent);
  border-radius: 2px;
}

.nav-cta {
  background: var(--c-accent);
  color: #fff !important;
  padding: 10px 22px !important;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: background .2s var(--easing), transform .15s var(--easing);
}
.nav-cta:hover { background: var(--c-accent-dark); transform: translateY(-1px); }

.nav-toggle {
  display: none;
  background: transparent;
  border: 0;
  width: 40px; height: 40px;
  padding: 0;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  display: block;
  width: 24px; height: 2px;
  background: var(--c-primary);
  border-radius: 2px;
  position: relative;
  transition: transform .25s var(--easing), top .25s var(--easing);
}
.nav-toggle span::before { content: ""; position: absolute; top: -7px; }
.nav-toggle span::after  { content: ""; position: absolute; top:  7px; }
.nav-toggle.open span { background: transparent; }
.nav-toggle.open span::before { top: 0; transform: rotate(45deg); }
.nav-toggle.open span::after  { top: 0; transform: rotate(-45deg); }

/* -------- Hero -------- */
.hero {
  position: relative;
  background:
    linear-gradient(135deg, rgba(10,26,56,.78), rgba(26,58,108,.65)),
    url("../images/hero/hero-bg.svg") center/cover no-repeat;
  background-color: var(--c-bg-dark);
  color: #fff;
  overflow: hidden;
  padding: 96px 0 88px;
}
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    repeating-linear-gradient(45deg, rgba(255,255,255,.025) 0 2px, transparent 2px 22px);
  pointer-events: none;
}
.hero-inner { position: relative; display: grid; grid-template-columns: 1.4fr .9fr; gap: 60px; align-items: center; }
.hero-eyebrow {
  display: inline-block;
  padding: 6px 14px;
  background: rgba(200,16,46,.15);
  border: 1px solid var(--c-accent);
  color: #ffb3bf;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  margin-bottom: 18px;
}
.hero h1 {
  font-size: 44px;
  line-height: 1.18;
  font-weight: 800;
  margin: 0 0 18px;
  letter-spacing: .5px;
}
.hero h1 .accent { color: var(--c-gold); }
.hero h1 .red { color: var(--c-accent); }
.hero-sub {
  font-size: 18px;
  color: rgba(255,255,255,.85);
  margin: 0 0 28px;
  max-width: 580px;
}
.hero-meta {
  display: flex; gap: 28px; flex-wrap: wrap;
  margin-bottom: 32px;
}
.hero-meta-item {
  display: flex; align-items: center; gap: 10px;
  font-size: 14px;
}
.hero-meta-item .badge {
  width: 36px; height: 36px;
  display: grid; place-items: center;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 8px;
  color: var(--c-gold);
  font-weight: 700;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  transition: all .2s var(--easing);
  border: 2px solid transparent;
}
.btn-primary { background: var(--c-accent); color: #fff; border-color: var(--c-accent); }
.btn-primary:hover { background: var(--c-accent-dark); border-color: var(--c-accent-dark); transform: translateY(-2px); }
.btn-outline { background: transparent; color: #fff; border-color: rgba(255,255,255,.4); }
.btn-outline:hover { border-color: #fff; background: rgba(255,255,255,.06); }
.btn-ghost { background: transparent; color: var(--c-primary); border-color: var(--c-primary); }
.btn-ghost:hover { background: var(--c-primary); color: #fff; }
.btn-gold { background: var(--c-gold); color: var(--c-bg-dark); border-color: var(--c-gold); }
.btn-gold:hover { background: #b08c45; }

/* Hero side card */
.hero-card {
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(6px);
}
.hero-card h3 {
  margin: 0 0 18px;
  font-size: 18px;
  color: var(--c-gold);
  letter-spacing: 1px;
  border-bottom: 1px solid rgba(255,255,255,.12);
  padding-bottom: 10px;
}
.hero-card dl { margin: 0; display: grid; grid-template-columns: 100px 1fr; row-gap: 12px; }
.hero-card dt { color: rgba(255,255,255,.65); font-size: 13px; }
.hero-card dd { margin: 0; color: #fff; font-size: 14px; font-weight: 500; }

/* -------- 章节通用 -------- */
.section { padding: 88px 0; }
.section.alt { background: var(--c-bg-alt); }
.section-title {
  text-align: center;
  margin-bottom: 56px;
}
.section-title h2 {
  font-size: 36px;
  font-weight: 800;
  color: var(--c-primary);
  margin: 0 0 12px;
  letter-spacing: 1px;
}
.section-title .subtitle {
  color: var(--c-text-3);
  font-size: 16px;
  max-width: 720px;
  margin: 0 auto;
}
.section-title .underline {
  width: 60px; height: 3px;
  background: linear-gradient(to right, var(--c-accent), var(--c-gold));
  margin: 18px auto 0;
  border-radius: 2px;
}

/* -------- 数据条 Stats -------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  background: linear-gradient(135deg, var(--c-primary), var(--c-primary-dark));
  color: #fff;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.stats-item {
  padding: 36px 24px;
  text-align: center;
  border-right: 1px solid rgba(255,255,255,.1);
}
.stats-item:last-child { border-right: 0; }
.stats-num {
  font-size: 44px;
  font-weight: 800;
  color: var(--c-gold);
  line-height: 1;
  margin-bottom: 8px;
}
.stats-num small { font-size: 22px; opacity: .85; }
.stats-label { color: rgba(255,255,255,.85); font-size: 14px; letter-spacing: .5px; }

/* -------- 优势列表 -------- */
.advantages {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.adv-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  transition: all .25s var(--easing);
  position: relative;
  overflow: hidden;
}
.adv-card::before {
  content: "";
  position: absolute; left: 0; top: 0;
  width: 4px; height: 0;
  background: var(--c-accent);
  transition: height .35s var(--easing);
}
.adv-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.adv-card:hover::before { height: 100%; }
.adv-icon {
  width: 56px; height: 56px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--c-primary), var(--c-primary-light));
  color: var(--c-gold);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  font-size: 26px;
  font-weight: 700;
}
.adv-card h3 {
  font-size: 18px;
  margin: 0 0 10px;
  color: var(--c-primary);
}
.adv-card p {
  color: var(--c-text-2);
  font-size: 14.5px;
  margin: 0;
  line-height: 1.7;
}

/* -------- 产品网格 -------- */
.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.product-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: all .25s var(--easing);
  position: relative;
  overflow: hidden;
}
.product-card:hover {
  border-color: var(--c-primary-light);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.product-tag {
  position: absolute; top: 16px; right: 16px;
  background: var(--c-accent);
  color: #fff;
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 100px;
  font-weight: 600;
  letter-spacing: .5px;
}
.product-icon {
  width: 64px; height: 64px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--c-bg-alt), #fff);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  margin-bottom: 18px;
  font-size: 28px;
  font-weight: 800;
  color: var(--c-primary);
  letter-spacing: -1px;
}
.product-card h3 {
  margin: 0 0 6px;
  font-size: 17px;
  color: var(--c-text);
  font-weight: 700;
}
.product-std {
  display: inline-block;
  background: var(--c-bg-alt);
  color: var(--c-primary);
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 14px;
}
.product-card .desc {
  color: var(--c-text-2);
  font-size: 14px;
  line-height: 1.65;
  margin: 0 0 16px;
  flex: 1;
}
.product-specs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px 14px;
  border-top: 1px dashed var(--c-border);
  padding-top: 14px;
  font-size: 13px;
}
.product-specs div {
  display: flex;
  align-items: baseline;
  gap: 6px;
  color: var(--c-text-2);
}
.product-specs .label { color: var(--c-text-3); font-size: 12px; }
.product-specs .value { color: var(--c-text); font-weight: 600; }

/* -------- 产品图廊（15 大类视觉展示） -------- */
.product-gallery {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.gallery-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  transition: all .25s var(--easing);
  position: relative;
}
.gallery-card:hover {
  border-color: var(--c-accent);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}
.gallery-img {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--c-bg-alt);
}
.gallery-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform .35s var(--easing);
}
.gallery-card:hover .gallery-img img {
  transform: scale(1.06);
}
.gallery-img::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 50%;
  background: linear-gradient(to top, rgba(0,0,0,.18), transparent);
  pointer-events: none;
}
.gallery-meta {
  position: absolute;
  top: 10px; left: 10px;
  display: flex;
  gap: 6px;
  align-items: center;
  z-index: 2;
}
.gallery-num {
  background: var(--c-gold);
  color: var(--c-primary);
  font-weight: 800;
  font-size: 13px;
  padding: 3px 9px;
  border-radius: 100px;
  font-family: Arial, sans-serif;
  letter-spacing: .5px;
}
.gallery-std {
  background: rgba(255,255,255,.95);
  color: var(--c-primary);
  font-weight: 600;
  font-size: 11px;
  padding: 3px 9px;
  border-radius: 100px;
  backdrop-filter: blur(4px);
}
.hot-tag {
  background: var(--c-accent);
  color: #fff;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 100px;
  margin-left: 6px;
  vertical-align: middle;
  font-weight: 700;
  letter-spacing: .5px;
}
.gallery-card h3 {
  margin: 14px 16px 8px;
  font-size: 16px;
  color: var(--c-text);
  font-weight: 700;
  line-height: 1.4;
}
.gallery-card p {
  margin: 0 16px 16px;
  font-size: 12px;
  color: var(--c-text-3);
  line-height: 1.6;
  flex: 1;
}

/* 产品筛选按钮 */
.product-filter {
  display: flex; flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 40px;
}
.product-filter button {
  padding: 9px 20px;
  background: #fff;
  border: 1px solid var(--c-border);
  color: var(--c-text-2);
  border-radius: 100px;
  font-size: 14px;
  font-weight: 500;
  transition: all .2s var(--easing);
}
.product-filter button:hover { border-color: var(--c-primary); color: var(--c-primary); }
.product-filter button.active {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(26,58,108,.25);
}

/* -------- 应用领域 -------- */
.applications {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.app-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 0;
  text-align: center;
  transition: all .3s var(--easing);
  display: block;
  color: inherit;
  text-decoration: none;
  position: relative;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,.04);
}
.app-card:hover {
  border-color: var(--c-accent);
  box-shadow: 0 16px 40px -12px rgba(200,16,46,.25);
  transform: translateY(-6px);
}
.app-img {
  width: 100%;
  height: 180px;
  display: block;
  background: #1a3a6c center/cover no-repeat;
  position: relative;
  overflow: hidden;
}
.app-img::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(0,0,0,.4) 100%);
  pointer-events: none;
}
.app-img img,
.app-img svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform .5s var(--easing);
}
.app-card:hover .app-img img,
.app-card:hover .app-img svg {
  transform: scale(1.08);
}
.app-body {
  padding: 22px 20px 24px;
  position: relative;
}
.app-body h4 {
  margin: 0 0 8px;
  font-size: 18px;
  color: var(--c-text);
  font-weight: 700;
}
.app-body p {
  margin: 0 0 14px;
  font-size: 13px;
  color: var(--c-text-3);
  line-height: 1.55;
}
.app-link-hint {
  display: inline-block;
  font-size: 13px;
  color: var(--c-accent);
  font-weight: 600;
  letter-spacing: .5px;
  transition: all .25s var(--easing);
}
.app-card:hover .app-link-hint {
  letter-spacing: 1.4px;
}
.app-link-hint::after {
  content: " →";
  display: inline-block;
  transition: transform .25s var(--easing);
}
.app-card:hover .app-link-hint::after {
  transform: translateX(3px);
}

/* -------- 关于我们 / 时间线 -------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}
.about-text h3 {
  color: var(--c-primary);
  font-size: 24px;
  margin: 0 0 16px;
}
.about-text p {
  color: var(--c-text-2);
  margin: 0 0 16px;
}
.about-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
}
.about-list li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 12px;
  color: var(--c-text-2);
}
.about-list li::before {
  content: "✓";
  position: absolute; left: 0; top: 0;
  width: 20px; height: 20px;
  background: var(--c-accent);
  color: #fff;
  border-radius: 50%;
  display: grid; place-items: center;
  font-size: 12px;
  font-weight: 700;
}

.credential-card {
  background: linear-gradient(135deg, var(--c-primary), var(--c-primary-dark));
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 40px;
  position: relative;
  overflow: hidden;
}
.credential-card::before {
  content: "包钢";
  position: absolute;
  right: -30px; top: -20px;
  font-size: 130px;
  font-weight: 800;
  color: rgba(255,255,255,.05);
  letter-spacing: 6px;
}
.credential-card h3 {
  margin: 0 0 12px;
  color: var(--c-gold);
  font-size: 22px;
  letter-spacing: 1px;
}
.credential-card .quote {
  font-size: 17px;
  line-height: 1.7;
  margin: 0 0 24px;
}
.credential-card ul {
  list-style: none;
  margin: 0; padding: 0;
  display: grid; gap: 10px;
}
.credential-card li {
  display: flex; align-items: flex-start; gap: 10px;
  font-size: 14.5px;
  color: rgba(255,255,255,.92);
}
.credential-card li::before {
  content: "▸";
  color: var(--c-gold);
  margin-top: 2px;
}

/* -------- 联系我们 -------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 40px;
}
.contact-info {
  background: linear-gradient(135deg, var(--c-primary), var(--c-primary-dark));
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 44px;
  position: relative;
  overflow: hidden;
}
.contact-info::after {
  content: "";
  position: absolute;
  right: -40px; bottom: -40px;
  width: 200px; height: 200px;
  background: radial-gradient(circle, rgba(200,16,46,.3), transparent 70%);
}
.contact-info h2 {
  margin: 0 0 8px;
  font-size: 28px;
  color: var(--c-gold);
}
.contact-info .lead {
  color: rgba(255,255,255,.85);
  margin: 0 0 32px;
  font-size: 15px;
}
.contact-info dl { margin: 0; display: grid; row-gap: 24px; }
.contact-info dt { color: var(--c-gold); font-size: 13px; letter-spacing: 1px; margin-bottom: 4px; }
.contact-info dd { margin: 0; font-size: 17px; font-weight: 600; }
.contact-info dd a { color: #fff; border-bottom: 1px dashed rgba(255,255,255,.4); }

.contact-form {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 44px;
  box-shadow: var(--shadow-sm);
}
.contact-form h2 {
  margin: 0 0 6px;
  color: var(--c-primary);
  font-size: 24px;
}
.contact-form .lead {
  color: var(--c-text-3);
  font-size: 14px;
  margin: 0 0 24px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}
.form-group { display: flex; flex-direction: column; }
.form-group.full { grid-column: 1 / -1; }
.form-group label {
  font-size: 13px;
  font-weight: 600;
  color: var(--c-text-2);
  margin-bottom: 6px;
}
.form-group label .req { color: var(--c-accent); margin-left: 2px; }
.form-group input,
.form-group select,
.form-group textarea {
  border: 1px solid var(--c-border);
  background: #fff;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: inherit;
  color: var(--c-text);
  transition: border-color .2s var(--easing), box-shadow .2s var(--easing);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: 0;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(26,58,108,.12);
}
.form-group textarea { resize: vertical; min-height: 100px; }
.form-submit {
  background: var(--c-accent);
  color: #fff;
  border: 0;
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  transition: background .2s var(--easing);
  width: 100%;
  margin-top: 4px;
}
.form-submit:hover { background: var(--c-accent-dark); }
.form-submit:disabled { opacity: .55; cursor: wait; }
.form-success {
  display: none;
  background: #e9f7ef;
  color: #1d6f42;
  border: 1px solid #b6e5c5;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  margin-top: 14px;
}
.form-success.show { display: block; }

/* 地图占位 */
.map-block {
  margin-top: 56px;
  background: var(--c-bg-alt);
  border-radius: var(--radius-md);
  padding: 28px;
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 32px;
  align-items: center;
}
.map-info h3 {
  margin: 0 0 8px;
  color: var(--c-primary);
}
.map-info p { color: var(--c-text-2); margin: 0 0 12px; }
.map-info .actions { margin-top: 18px; display: flex; gap: 10px; flex-wrap: wrap; }
.map-canvas {
  background: linear-gradient(135deg, #dde6f0, #c0cfdf);
  border-radius: var(--radius-md);
  height: 240px;
  display: grid; place-items: center;
  color: var(--c-primary);
  position: relative;
  overflow: hidden;
  border: 1px solid var(--c-border);
}
.map-canvas::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(26,58,108,.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26,58,108,.1) 1px, transparent 1px);
  background-size: 30px 30px;
}
.map-pin {
  position: relative;
  background: var(--c-accent);
  color: #fff;
  padding: 12px 18px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  box-shadow: 0 6px 18px rgba(200,16,46,.35);
  z-index: 1;
}
.map-pin::after {
  content: "";
  position: absolute;
  left: 50%; bottom: -8px;
  width: 12px; height: 12px;
  background: var(--c-accent);
  transform: translateX(-50%) rotate(45deg);
}

/* -------- 面包屑 -------- */
.page-banner {
  background:
    linear-gradient(135deg, rgba(15,29,54,.85), rgba(26,58,108,.75)),
    radial-gradient(circle at 90% 20%, rgba(200,16,46,.18), transparent 50%);
  background-color: var(--c-bg-dark);
  color: #fff;
  padding: 64px 0 56px;
  position: relative;
  overflow: hidden;
}
.page-banner::before {
  content: "";
  position: absolute; inset: 0;
  background-image: repeating-linear-gradient(45deg, rgba(255,255,255,.02) 0 2px, transparent 2px 22px);
}
.page-banner h1 {
  font-size: 36px;
  margin: 0 0 8px;
  letter-spacing: 2px;
}
.page-banner .crumb {
  color: rgba(255,255,255,.7);
  font-size: 14px;
}
.page-banner .crumb a { color: var(--c-gold); }
.page-banner .crumb span { margin: 0 8px; opacity: .5; }

/* -------- 关于页 资质/理念 -------- */
.value-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 40px;
}
.value-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 26px 20px;
  text-align: center;
}
.value-num {
  font-size: 36px;
  font-weight: 800;
  color: var(--c-accent);
  line-height: 1;
  margin-bottom: 8px;
}
.value-card h4 { margin: 0 0 6px; color: var(--c-primary); font-size: 15px; }
.value-card p { margin: 0; font-size: 13px; color: var(--c-text-3); }

.about-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}
.feature-block {
  background: linear-gradient(135deg, #fff, var(--c-bg-alt));
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 32px 24px;
}
.feature-block h4 {
  margin: 0 0 10px;
  color: var(--c-primary);
  font-size: 18px;
}
.feature-block p {
  margin: 0;
  color: var(--c-text-2);
  font-size: 14px;
  line-height: 1.7;
}

/* -------- 表格（产品规格） -------- */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--c-border);
  font-size: 14px;
}
.spec-table thead {
  background: var(--c-primary);
  color: #fff;
}
.spec-table th, .spec-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--c-border);
}
.spec-table tbody tr:nth-child(odd) { background: var(--c-bg-alt); }
.spec-table tbody tr:hover { background: #eef3fb; }

/* -------- Footer -------- */
.footer {
  background: var(--c-bg-dark);
  color: rgba(255,255,255,.7);
  padding: 60px 0 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 36px;
  margin-bottom: 36px;
}
.footer h5 {
  margin: 0 0 14px;
  color: var(--c-gold);
  font-size: 14px;
  letter-spacing: 1px;
}
.footer p { margin: 0 0 8px; font-size: 14px; line-height: 1.7; }
.footer ul { list-style: none; margin: 0; padding: 0; }
.footer li { margin-bottom: 8px; font-size: 14px; }
.footer a { color: rgba(255,255,255,.7); transition: color .2s var(--easing); }
.footer a:hover { color: var(--c-gold); }
.footer .brand-name { color: #fff; font-size: 17px; font-weight: 700; margin-bottom: 6px; }
.footer .brand-en { color: rgba(255,255,255,.5); font-size: 12px; margin-bottom: 14px; letter-spacing: 1px; }
.footer .ic {
  width: 28px; height: 28px;
  display: inline-grid; place-items: center;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 6px;
  color: var(--c-gold);
  margin-right: 10px;
  vertical-align: middle;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding-top: 18px;
  text-align: center;
  font-size: 13px;
  color: rgba(255,255,255,.5);
}

/* -------- 响应式 -------- */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero h1 { font-size: 36px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stats-item:nth-child(2n) { border-right: 0; }
  .stats-item:nth-child(-n+2) { border-bottom: 1px solid rgba(255,255,255,.1); }
  .advantages, .products-grid, .about-features { grid-template-columns: repeat(2, 1fr); }
  .applications { grid-template-columns: repeat(3, 1fr); }
  .value-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .map-block { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .product-gallery { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
  .topbar { font-size: 12px; }
  .topbar-info { gap: 14px; }
  .navbar .container { height: 64px; }
  .nav-brand-cn { font-size: 16px; }
  .nav-menu {
    position: fixed;
    top: 64px; left: 0; right: 0;
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 16px;
    box-shadow: var(--shadow-md);
    max-height: 0;
    overflow: hidden;
    transition: max-height .3s var(--easing);
  }
  .nav-menu.open { max-height: 600px; }
  .nav-menu a { padding: 14px 12px; border-bottom: 1px solid var(--c-border); }
  .nav-menu a.active::after { display: none; }
  .nav-toggle { display: block; }
  .nav-cta { margin-top: 8px; text-align: center; }

  .hero { padding: 56px 0 64px; }
  .hero h1 { font-size: 28px; }
  .hero-sub { font-size: 15px; }
  .hero-card { padding: 22px; }
  .hero-card dl { grid-template-columns: 80px 1fr; }

  .section { padding: 56px 0; }
  .section-title h2 { font-size: 26px; }

  .stats { grid-template-columns: 1fr 1fr; }
  .stats-num { font-size: 32px; }
  .advantages, .products-grid, .about-features { grid-template-columns: 1fr; }
  .applications { grid-template-columns: 1fr 1fr; }
  .value-grid { grid-template-columns: 1fr 1fr; }
  .product-gallery { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .form-row { grid-template-columns: 1fr; }
  .contact-info, .contact-form { padding: 28px; }
  .page-banner { padding: 44px 0 36px; }
  .page-banner h1 { font-size: 26px; }
}
@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .applications { grid-template-columns: 1fr; }
  .value-grid { grid-template-columns: 1fr; }
  .product-gallery { grid-template-columns: 1fr; }
  .profile-grid, .know-grid, .std-grid, .select-grid, .term-grid { grid-template-columns: 1fr; }
  .calc-result { grid-template-columns: 1fr; }
}

/* ============================================================
   页面通用：面包屑、Page Hero、按钮、CTA
   ============================================================ */
.breadcrumb {
  background: var(--c-bg-alt);
  padding: 14px 0;
  font-size: 13px;
  color: var(--c-text-3);
  border-bottom: 1px solid var(--c-border);
}
.breadcrumb a { color: var(--c-text-2); text-decoration: none; transition: color .2s; }
.breadcrumb a:hover { color: var(--c-accent); }
.breadcrumb span { margin: 0 8px; color: var(--c-text-3); }

.page-hero {
  background:
    linear-gradient(135deg, rgba(15,29,54,.94), rgba(26,58,108,.86)),
    radial-gradient(circle at 80% 30%, rgba(200,16,46,.28), transparent 55%);
  background-color: var(--c-bg-dark);
  color: #fff;
  padding: 70px 0 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-hero::after {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.03) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
}
.page-hero > .container { position: relative; z-index: 1; }
.page-hero h1 {
  font-size: 42px;
  margin: 0 0 18px;
  font-weight: 700;
  letter-spacing: 2px;
}
.page-hero h1 .accent {
  color: var(--c-accent-gold);
  position: relative;
}
.page-hero-sub {
  font-size: 16px;
  color: rgba(255,255,255,.78);
  max-width: 720px;
  margin: 0 auto 28px;
  line-height: 1.8;
}
.hero-tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(200,16,46,.18);
  border: 1px solid rgba(200,16,46,.5);
  border-radius: 100px;
  font-size: 13px;
  color: #ffd8d8;
  margin-bottom: 18px;
  letter-spacing: 1px;
}
.hero-cta {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}
.btn-primary, .btn-secondary {
  display: inline-block;
  padding: 13px 30px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: all .25s var(--easing);
  border: 2px solid transparent;
  letter-spacing: 1px;
}
.btn-primary {
  background: var(--c-accent);
  color: #fff;
  box-shadow: 0 4px 12px rgba(200,16,46,.3);
}
.btn-primary:hover {
  background: #a40d24;
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(200,16,46,.4);
}
.btn-secondary {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,.4);
}
.btn-secondary:hover {
  background: rgba(255,255,255,.1);
  border-color: #fff;
}

.cta-band {
  background: linear-gradient(135deg, var(--c-accent), #a40d24);
  color: #fff;
  padding: 50px 0;
  text-align: center;
}
.cta-band h3 {
  margin: 0 0 12px;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 1px;
}
.cta-band p {
  margin: 0 0 22px;
  font-size: 15px;
  opacity: .9;
}
.cta-band .btn-primary {
  background: #fff;
  color: var(--c-accent);
}
.cta-band .btn-primary:hover {
  background: var(--c-accent-gold);
  color: #fff;
}

.float-cta {
  position: fixed;
  right: 20px;
  bottom: 30px;
  background: var(--c-accent);
  color: #fff;
  padding: 12px 18px;
  border-radius: 100px;
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  box-shadow: 0 6px 20px rgba(200,16,46,.4);
  z-index: 99;
  transition: all .25s var(--easing);
}
.float-cta:hover {
  background: #a40d24;
  transform: translateY(-3px);
}

@media (max-width: 768px) {
  .page-hero { padding: 50px 0 40px; }
  .page-hero h1 { font-size: 30px; }
  .page-hero-sub { font-size: 14px; }
  .hero-cta .btn-primary, .hero-cta .btn-secondary { padding: 11px 22px; font-size: 14px; }
}

/* ============================================================
   型材页：profile.html
   ============================================================ */
.profile-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.profile-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  position: relative;
  transition: all .3s var(--easing);
  display: block;
}
.profile-card:hover {
  border-color: var(--c-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}
.profile-img {
  position: relative;
  height: 200px;
  overflow: hidden;
  background: var(--c-bg-alt);
}
.profile-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .35s var(--easing);
}
.profile-card:hover .profile-img img { transform: scale(1.08); }
.profile-img::after {
  content: "";
  position: absolute; left: 0; right: 0; bottom: 0;
  height: 50%;
  background: linear-gradient(to bottom, transparent, rgba(0,0,0,.55));
  pointer-events: none;
}

/* SVG 截面图卡片（标准型材 H/I/C/L/□/▬/●） */
.profile-svg {
  position: relative;
  height: 200px;
  overflow: hidden;
  background:
    linear-gradient(135deg, #0f1d36 0%, #1a3a6c 50%, #0f1d36 100%);
  display: grid;
  place-items: center;
  transition: all .35s var(--easing);
}
.profile-svg::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 24px 24px;
  opacity: .6;
  transition: opacity .35s var(--easing);
}
.profile-svg svg {
  width: 65%;
  height: 65%;
  position: relative;
  z-index: 1;
  filter: drop-shadow(0 4px 12px rgba(0,0,0,.4));
  transition: transform .35s var(--easing);
}
.profile-svg::after {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  width: 140px; height: 140px;
  margin: -70px 0 0 -70px;
  background: radial-gradient(circle, rgba(201,164,90,.18), transparent 70%);
  z-index: 0;
  transition: all .35s var(--easing);
}
.profile-card:hover .profile-svg { background: linear-gradient(135deg, #1a3a6c 0%, #c8102e 100%); }
.profile-card:hover .profile-svg::before { opacity: 1; }
.profile-card:hover .profile-svg svg { transform: scale(1.12); }
.profile-card:hover .profile-svg::after { width: 200px; height: 200px; margin: -100px 0 0 -100px; }
.profile-num {
  position: absolute;
  top: 12px;
  left: 12px;
  width: 38px;
  height: 38px;
  background: var(--c-accent-gold);
  color: #fff;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 14px;
  font-weight: 700;
  box-shadow: 0 3px 10px rgba(0,0,0,.3);
  z-index: 2;
}
.profile-body { padding: 18px 20px 22px; }
.profile-std {
  display: inline-block;
  font-size: 11px;
  background: var(--c-bg-alt);
  color: var(--c-text-2);
  padding: 3px 10px;
  border-radius: 100px;
  margin-bottom: 10px;
  letter-spacing: .5px;
}
.profile-body h4 {
  margin: 0 0 6px;
  font-size: 18px;
  color: var(--c-text);
  font-weight: 700;
}
.profile-body p {
  margin: 0;
  font-size: 13px;
  color: var(--c-text-3);
  line-height: 1.5;
}

.profile-detail { display: flex; flex-direction: column; gap: 32px; }
.profile-block {
  background: #fff;
  border: 1px solid var(--c-border);
  border-left: 4px solid var(--c-accent);
  border-radius: var(--radius-md);
  padding: 28px 32px;
  transition: all .25s var(--easing);
}
.profile-block:hover { box-shadow: var(--shadow-sm); }
.profile-block h3 {
  margin: 0 0 12px;
  font-size: 22px;
  color: var(--c-text);
  display: flex;
  align-items: center;
  gap: 14px;
}
.prof-no {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  background: var(--c-accent);
  color: #fff;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 700;
}
.profile-block > p {
  margin: 0 0 16px;
  color: var(--c-text-2);
  font-size: 15px;
  line-height: 1.7;
}
.profile-block ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 24px;
}
.profile-block li {
  font-size: 14px;
  color: var(--c-text-2);
  line-height: 1.6;
  padding-left: 18px;
  position: relative;
}
.profile-block li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--c-accent);
  font-size: 12px;
  top: 1px;
}
.profile-block li strong { color: var(--c-text); margin-right: 4px; }

@media (max-width: 1024px) {
  .profile-grid { grid-template-columns: repeat(3, 1fr); }
  .profile-block ul { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .profile-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  .profile-img { height: 160px; }
  .profile-body { padding: 14px 16px 18px; }
  .profile-body h4 { font-size: 16px; }
  .profile-block { padding: 22px 20px; }
  .profile-block h3 { font-size: 18px; }
}

/* ============================================================
   知识页：knowledge.html
   ============================================================ */
.know-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.know-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  text-align: center;
  text-decoration: none;
  color: inherit;
  transition: all .3s var(--easing);
  position: relative;
  overflow: hidden;
}
.know-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--c-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .35s var(--easing);
}
.know-card:hover {
  border-color: var(--c-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.know-card:hover::before { transform: scaleX(1); }
.know-icon {
  font-size: 38px;
  margin-bottom: 14px;
  line-height: 1;
}
.know-card h4 {
  margin: 0 0 10px;
  font-size: 18px;
  color: var(--c-text);
  font-weight: 700;
}
.know-card p {
  margin: 0;
  font-size: 13px;
  color: var(--c-text-3);
  line-height: 1.6;
}

.know-content {
  max-width: 880px;
  margin: 0 auto;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-text-2);
}
.know-content h3 {
  font-size: 19px;
  color: var(--c-text);
  margin: 28px 0 12px;
  padding-left: 14px;
  border-left: 4px solid var(--c-accent);
  font-weight: 700;
}
.know-content h3:first-child { margin-top: 0; }
.know-content p { margin: 0 0 12px; }
.know-content code {
  background: var(--c-bg-alt);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: 'Consolas', 'Monaco', monospace;
  font-size: 14px;
  color: var(--c-accent);
  border: 1px solid var(--c-border);
}
.know-content strong { color: var(--c-text); font-weight: 700; }
.know-content ul, .know-content ol {
  margin: 0 0 12px;
  padding-left: 24px;
}
.know-content li { margin: 4px 0; }

.calc-box {
  max-width: 760px;
  margin: 0 auto;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 36px;
  box-shadow: var(--shadow-sm);
}
.calc-row {
  display: grid;
  grid-template-columns: 160px 1fr;
  align-items: center;
  gap: 16px;
  margin-bottom: 14px;
}
.calc-row label {
  font-size: 14px;
  color: var(--c-text-2);
  font-weight: 600;
}
.calc-row input {
  padding: 10px 14px;
  border: 1px solid var(--c-border);
  border-radius: 6px;
  font-size: 15px;
  font-family: 'Consolas', monospace;
  transition: border-color .2s;
}
.calc-row input:focus {
  outline: none;
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px rgba(200,16,46,.1);
}
.calc-result {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px dashed var(--c-border);
}
.calc-item {
  background: var(--c-bg-alt);
  padding: 16px;
  border-radius: 8px;
  text-align: center;
}
.calc-item span {
  display: block;
  font-size: 12px;
  color: var(--c-text-3);
  margin-bottom: 6px;
  letter-spacing: 1px;
}
.calc-item b {
  display: block;
  font-size: 24px;
  color: var(--c-accent);
  font-weight: 700;
  font-family: 'Consolas', monospace;
}
.calc-item.highlight {
  background: var(--c-accent);
  color: #fff;
}
.calc-item.highlight span { color: rgba(255,255,255,.85); }
.calc-item.highlight b { color: #fff; font-size: 28px; }
.calc-note {
  margin: 20px 0 0;
  font-size: 12px;
  color: var(--c-text-3);
  line-height: 1.6;
  padding: 10px 14px;
  background: #fff8e6;
  border-left: 3px solid var(--c-accent-gold);
  border-radius: 4px;
}

.std-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.std-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  transition: all .3s var(--easing);
}
.std-card:hover { border-color: var(--c-accent); box-shadow: var(--shadow-sm); }
.std-flag {
  display: inline-block;
  color: #fff;
  padding: 8px 18px;
  border-radius: 6px;
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 14px;
  letter-spacing: 1px;
}
.std-card h4 {
  margin: 0 0 10px;
  font-size: 18px;
  color: var(--c-text);
}
.std-card > p {
  margin: 0 0 16px;
  font-size: 13px;
  color: var(--c-text-3);
  line-height: 1.6;
}
.std-card ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.std-card li {
  font-size: 13px;
  color: var(--c-text-2);
  padding-left: 18px;
  position: relative;
  line-height: 1.5;
}
.std-card li::before {
  content: "•";
  position: absolute;
  left: 6px;
  color: var(--c-accent);
  font-weight: 700;
}
.std-card li strong { color: var(--c-text); }

.std-table-wrap { overflow-x: auto; }
.table-note {
  margin: 14px 0 0;
  font-size: 12px;
  color: var(--c-text-3);
  font-style: italic;
}

.term-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.term-item {
  background: #fff;
  border: 1px solid var(--c-border);
  border-top: 3px solid var(--c-accent);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  transition: all .25s var(--easing);
}
.term-item:hover { box-shadow: var(--shadow-sm); transform: translateY(-2px); }
.term-item h4 {
  margin: 0 0 10px;
  font-size: 16px;
  color: var(--c-text);
  font-weight: 700;
}
.term-item p {
  margin: 0;
  font-size: 13px;
  color: var(--c-text-3);
  line-height: 1.7;
}
.term-item strong { color: var(--c-text-2); }

.select-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}
.select-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 28px 28px 24px;
  position: relative;
}
.select-step {
  display: inline-block;
  background: linear-gradient(135deg, var(--c-accent), #a40d24);
  color: #fff;
  padding: 4px 14px;
  border-radius: 100px;
  font-size: 11px;
  letter-spacing: 1.5px;
  font-weight: 700;
  margin-bottom: 12px;
}
.select-card h4 {
  margin: 0 0 14px;
  font-size: 20px;
  color: var(--c-text);
  font-weight: 700;
}
.select-card ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
.select-card li {
  font-size: 13px;
  color: var(--c-text-2);
  line-height: 1.7;
  padding: 6px 0 6px 22px;
  position: relative;
  border-bottom: 1px dashed var(--c-border);
}
.select-card li:last-child { border-bottom: none; }
.select-card li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 6px;
  color: var(--c-accent);
  font-weight: 700;
}
.select-card li strong { color: var(--c-text); display: inline-block; min-width: 130px; }

.quality-list {
  max-width: 880px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.quality-item {
  display: flex;
  gap: 22px;
  background: #fff;
  border: 1px solid var(--c-border);
  border-left: 4px solid var(--c-accent);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  align-items: flex-start;
}
.quality-no {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: var(--c-accent);
  color: #fff;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 20px;
  font-weight: 700;
  box-shadow: 0 3px 8px rgba(200,16,46,.25);
}
.quality-item h4 {
  margin: 0 0 8px;
  font-size: 17px;
  color: var(--c-text);
  font-weight: 700;
}
.quality-item p {
  margin: 0;
  font-size: 14px;
  color: var(--c-text-2);
  line-height: 1.7;
}

@media (max-width: 1024px) {
  .know-grid { grid-template-columns: repeat(3, 1fr); }
  .std-grid, .term-grid { grid-template-columns: repeat(2, 1fr); }
  .select-grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .know-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
  .know-card { padding: 20px 16px; }
  .know-icon { font-size: 30px; }
  .know-card h4 { font-size: 15px; }
  .std-grid, .term-grid { grid-template-columns: 1fr; }
  .calc-box { padding: 22px; }
  .calc-row { grid-template-columns: 1fr; gap: 6px; }
  .quality-item { padding: 18px 20px; gap: 16px; }
  .quality-no { width: 36px; height: 36px; font-size: 16px; }
}

/* ====================================================== */
/* 文章系统（技术文章 / 资讯）— SEO 内容发布骨架            */
/* ====================================================== */
.article-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.article-card {
  display: flex; gap: 16px; align-items: stretch;
  background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius-md);
  padding: 18px; text-decoration: none; color: inherit;
  transition: box-shadow .25s var(--easing), transform .15s var(--easing), border-color .2s;
}
.article-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); border-color: var(--c-gold); }
.article-thumb {
  flex: 0 0 88px; width: 88px; height: 88px; border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--c-primary), var(--c-bg-dark));
  color: #fff; display: flex; align-items: center; justify-content: center; font-size: 34px;
}
.article-info { flex: 1; min-width: 0; }
.article-meta { display: flex; flex-wrap: wrap; gap: 10px; font-size: 12px; color: var(--c-text-3); margin-bottom: 6px; }
.article-cat { color: var(--c-accent); font-weight: 600; }
.article-card h4 { font-size: 17px; margin: 0 0 6px; color: var(--c-primary); line-height: 1.4; }
.article-excerpt { font-size: 13.5px; color: var(--c-text-2); line-height: 1.7; margin: 0;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.article-more { text-align: center; margin-top: 26px; }

/* 文章详情页 */
.article-page .page-hero { text-align: left; padding: 56px 0 46px; }
.article-meta-hero { display: flex; flex-wrap: wrap; gap: 14px; font-size: 13px; color: rgba(255,255,255,.82); margin-top: 16px; }
.article-meta-hero .tag { background: rgba(200,16,46,.22); border: 1px solid rgba(200,16,46,.5); color: #ffd8d8; padding: 3px 12px; border-radius: 100px; }
.article-body { max-width: 820px; margin: 0 auto; padding: 46px 0 30px; line-height: 1.95; color: var(--c-text); font-size: 16px; }
.article-body h2 { font-size: 24px; color: var(--c-primary); margin: 38px 0 14px; padding-left: 14px; border-left: 4px solid var(--c-accent); }
.article-body h3 { font-size: 19px; color: var(--c-primary); margin: 28px 0 10px; }
.article-body p { margin: 0 0 16px; }
.article-body ul, .article-body ol { margin: 0 0 16px; padding-left: 22px; }
.article-body li { margin: 6px 0; }
.article-body strong { color: var(--c-primary); }
.article-body blockquote { margin: 18px 0; padding: 14px 18px; background: #f5f7fb; border-left: 4px solid var(--c-gold); color: var(--c-text-2); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.article-body table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 14.5px; }
.article-body th, .article-body td { border: 1px solid var(--c-border); padding: 9px 12px; text-align: left; }
.article-body th { background: #f0f3f9; color: var(--c-primary); font-weight: 600; }
.article-tip { background: linear-gradient(135deg, rgba(201,164,90,.12), rgba(26,58,108,.06)); border: 1px solid var(--c-gold); border-radius: var(--radius-sm); padding: 14px 18px; margin: 20px 0; }
.article-back { text-align: center; margin: 6px 0 52px; }

@media (max-width: 768px) {
  .article-list { grid-template-columns: 1fr; }
}

/* 资讯中心：分类筛选标签 */
.cat-filter { display: flex; flex-wrap: wrap; gap: 10px; margin: 6px 0 26px; }
.cat-tab {
  border: 1px solid var(--c-border); background: #fff; color: var(--c-text-2);
  font-size: 14px; padding: 8px 18px; border-radius: 100px; cursor: pointer;
  transition: all .2s var(--easing); font-family: inherit;
}
.cat-tab:hover { border-color: var(--c-gold); color: var(--c-primary); }
.cat-tab.active { background: var(--c-primary); border-color: var(--c-primary); color: #fff; }

/* 公司新闻 / 技术文章 分类徽标配色 */
.article-cat.news { color: var(--c-accent); }
.article-cat.tech { color: var(--c-gold); }

/* ====================================================== */
/* 关于我们页（按正式公司简介重构）                        */
/* ====================================================== */

/* 四列支柱卡：产品矩阵 / 标准合规 / 场景覆盖 / 供应保障 */
.pillar-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 8px; }
.pillar-card {
  position: relative; background: #fff; border: 1px solid var(--c-border);
  border-radius: var(--radius-md); padding: 24px 20px 22px; overflow: hidden;
  transition: box-shadow .25s var(--easing), transform .15s var(--easing), border-color .2s;
}
.pillar-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: var(--c-gold); }
.pillar-card::before {
  content: ""; position: absolute; left: 0; top: 0; width: 100%; height: 4px;
  background: linear-gradient(90deg, var(--c-primary), var(--c-gold));
}
.pillar-no { font-size: 13px; font-weight: 700; color: var(--c-gold); letter-spacing: 1px; }
.pillar-card h4 { margin: 8px 0 10px; font-size: 18px; color: var(--c-primary); }
.pillar-card p { margin: 0; font-size: 13.5px; line-height: 1.75; color: var(--c-text-2); }

/* 产品类目标签 */
.cat-chips { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 4px; }
.cat-chip {
  display: inline-flex; align-items: center; gap: 7px;
  background: #f5f7fb; border: 1px solid var(--c-border); border-radius: 100px;
  padding: 7px 16px; font-size: 13.5px; color: var(--c-text-2);
}
.cat-chip b { color: var(--c-primary); font-weight: 600; }
.cat-chip::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--c-gold); flex: 0 0 auto; }

/* 现货 / 加工 / 交付 三卡 */
.svc-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 8px; }
.svc-card {
  background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius-md);
  padding: 24px 22px; transition: box-shadow .25s var(--easing), transform .15s var(--easing);
}
.svc-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.svc-ico { font-size: 30px; margin-bottom: 10px; }
.svc-card h4 { margin: 0 0 9px; font-size: 17px; color: var(--c-primary); }
.svc-card p { margin: 0; font-size: 14px; line-height: 1.8; color: var(--c-text-2); }

/* 经营理念 / 愿景 */
.philo-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.philo-card { background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius-md); padding: 28px 26px; }
.philo-card.vision { background: linear-gradient(135deg, var(--c-primary), var(--c-bg-dark)); color: #fff; border: none; }
.philo-card.vision .philo-tag, .philo-card.vision h4 { color: var(--c-gold); }
.philo-card.vision p { color: rgba(255,255,255,.9); }
.philo-tag { font-size: 13px; font-weight: 700; letter-spacing: 1px; color: var(--c-gold); }
.philo-card h4 { margin: 8px 0 12px; font-size: 21px; color: var(--c-primary); }
.philo-card p { margin: 0; font-size: 14.5px; line-height: 1.95; color: var(--c-text-2); }

@media (max-width: 1024px) {
  .pillar-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .pillar-grid, .svc-grid, .philo-grid { grid-template-columns: 1fr; }
}