/* ============ 设计令牌：蓝灰工业色板 ============ */
:root {
  --c-primary: #34506b;
  --c-primary-deep: #22394f;
  --c-primary-dark: #16283a;
  --c-primary-soft: #5b7fa0;
  --c-accent: #c2933d;
  --c-accent-deep: #a37c2b;
  --c-bg: #f2f5f8;
  --c-bg-alt: #ffffff;
  --c-line: #dbe3ea;
  --c-line-soft: #e6edf2;
  --c-text: #25313d;
  --c-text-soft: #5d6e7e;
  --c-white: #ffffff;
  --shadow-sm: 0 2px 8px rgba(34, 57, 79, 0.07);
  --shadow-md: 0 8px 24px rgba(34, 57, 79, 0.11);
  --shadow-lg: 0 16px 44px rgba(34, 57, 79, 0.18);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --header-h: 76px;
  --font-cn: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans SC", sans-serif;
  --font-en: "Segoe UI", "Helvetica Neue", "Arial", sans-serif;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ============ 基础 ============ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea, select { font-family: inherit; font-size: inherit; }
:focus-visible { outline: 3px solid var(--c-accent); outline-offset: 2px; border-radius: 3px; }
::selection { background: rgba(194, 147, 61, 0.22); }

.container { width: min(1200px, 92%); margin-inline: auto; }

/* ============ 通用组件 ============ */
.section { padding: 84px 0; }
.section--alt { background: var(--c-bg-alt); }
.section--line { border-bottom: 1px solid var(--c-line-soft); }

.section-head { max-width: 760px; margin: 0 auto 48px; }
.section-head--center { text-align: center; }
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-en);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--c-accent-deep);
  margin-bottom: 12px;
}
.section-tag::before { content: ""; width: 26px; height: 2px; background: var(--c-accent); }
.section-head--center .section-tag::after { content: ""; width: 26px; height: 2px; background: var(--c-accent); }
.section-title { font-size: clamp(26px, 3.6vw, 36px); font-weight: 800; color: var(--c-primary-deep); line-height: 1.3; letter-spacing: 0.5px; }
.section-sub { margin-top: 14px; color: var(--c-text-soft); font-size: 15.5px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.5px;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s var(--ease), color 0.25s;
  white-space: nowrap;
}
.btn svg { width: 17px; height: 17px; flex-shrink: 0; }
.btn--primary { background: var(--c-primary); color: #fff; box-shadow: 0 8px 20px rgba(52, 80, 107, 0.3); }
.btn--primary:hover { background: var(--c-primary-deep); transform: translateY(-2px); box-shadow: 0 12px 26px rgba(52, 80, 107, 0.38); }
.btn--accent { background: var(--c-accent); color: #fff; box-shadow: 0 8px 20px rgba(194, 147, 61, 0.32); }
.btn--accent:hover { background: var(--c-accent-deep); transform: translateY(-2px); }
.btn--outline { border: 1.5px solid rgba(255,255,255,0.8); color: #fff; background: transparent; }
.btn--outline:hover { background: rgba(255,255,255,0.12); transform: translateY(-2px); }
.btn--ghost { border: 1.5px solid var(--c-primary); color: var(--c-primary); background: transparent; }
.btn--ghost:hover { background: var(--c-primary); color: #fff; transform: translateY(-2px); }
.btn--sm { padding: 9px 18px; font-size: 13.5px; }

/* ============ 顶部信息条 ============ */
.topbar { background: var(--c-primary-dark); color: rgba(255,255,255,0.78); font-size: 13px; padding: 7px 0; }
.topbar .container { display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.topbar-info { display: flex; gap: 26px; align-items: center; }
.topbar-info span { display: inline-flex; align-items: center; gap: 6px; }
.topbar-info svg { width: 13px; height: 13px; color: var(--c-accent); }
.topbar-info a:hover { color: var(--c-accent); }
.topbar-lang { display: flex; gap: 2px; font-size: 12.5px; }
.topbar-lang a { padding: 2px 10px; border: 1px solid transparent; }
.topbar-lang a.active { border-color: rgba(255,255,255,0.3); color: #fff; border-radius: 3px; }

/* ============ 头部导航 ============ */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.94);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}
.site-header.scrolled { box-shadow: 0 6px 22px rgba(34,57,79,0.09); border-color: var(--c-line-soft); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: var(--header-h); gap: 22px; }

.logo { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.logo-badge {
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  background: var(--c-primary-deep);
  display: grid; place-items: center;
  color: var(--c-accent);
  position: relative;
}
.logo-badge svg { width: 26px; height: 26px; }
.logo-text { display: flex; flex-direction: column; line-height: 1.25; }
.logo-text strong { font-size: 19px; font-weight: 800; color: var(--c-primary-deep); letter-spacing: 1px; }
.logo-text small { font-size: 10.5px; color: var(--c-text-soft); letter-spacing: 2px; font-family: var(--font-en); text-transform: uppercase; }

.main-nav ul { display: flex; gap: 4px; }
.main-nav a {
  display: block; padding: 10px 15px;
  font-size: 15px; font-weight: 500;
  color: var(--c-text);
  border-radius: var(--radius-sm);
  transition: color 0.25s, background 0.25s;
  position: relative;
}
.main-nav a::after {
  content: ""; position: absolute;
  left: 15px; right: 15px; bottom: 4px;
  height: 2px; background: var(--c-accent);
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.3s var(--ease);
}
.main-nav a:hover, .main-nav a.active { color: var(--c-primary); }
.main-nav a:hover::after, .main-nav a.active::after { transform: scaleX(1); }

.header-cta { display: flex; align-items: center; gap: 12px; }

.nav-toggle {
  display: none;
  width: 44px; height: 44px; border-radius: var(--radius-sm);
  position: relative; z-index: 110;
  border: 1.5px solid var(--c-line);
}
.nav-toggle .bar {
  position: absolute; left: 11px; right: 11px;
  height: 2px; border-radius: 2px;
  background: var(--c-primary-deep);
  transition: transform 0.35s var(--ease), opacity 0.25s, top 0.35s var(--ease);
}
.nav-toggle .bar:nth-child(1) { top: 14px; }
.nav-toggle .bar:nth-child(2) { top: 21px; }
.nav-toggle .bar:nth-child(3) { top: 28px; }
body.menu-open .nav-toggle .bar:nth-child(1) { top: 21px; transform: rotate(45deg); }
body.menu-open .nav-toggle .bar:nth-child(2) { opacity: 0; }
body.menu-open .nav-toggle .bar:nth-child(3) { top: 21px; transform: rotate(-45deg); }

/* ============ Hero 首屏 ============ */
.hero {
  position: relative;
  color: #fff;
  background:
    radial-gradient(900px 520px at 88% -10%, rgba(91,127,160,0.5), transparent 60%),
    radial-gradient(640px 420px at -8% 115%, rgba(194,147,61,0.16), transparent 55%),
    var(--c-primary-dark);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.045) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,0.9), transparent 90%);
  -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,0.9), transparent 90%);
  pointer-events: none;
}
.hero-inner {
  position: relative; z-index: 2;
  padding: clamp(64px, 9vh, 104px) 0 clamp(72px, 10vh, 112px);
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 52px;
  align-items: center;
}
.hero-tag {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-en);
  font-size: 12.5px; font-weight: 700;
  letter-spacing: 3px; text-transform: uppercase;
  color: #d9c08a;
  margin-bottom: 20px;
}
.hero-tag .dot { width: 7px; height: 7px; border-radius: 50%; background: #d9c08a; box-shadow: 0 0 0 4px rgba(217,192,138,0.22); animation: pulse 2.2s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }

.hero h1 { font-size: clamp(30px, 4.6vw, 50px); font-weight: 800; line-height: 1.25; letter-spacing: 0.5px; }
.hero h1 .accent { color: #d9c08a; }
.hero .lead { margin: 20px 0 30px; font-size: clamp(14.5px, 1.5vw, 17px); color: rgba(255,255,255,0.85); max-width: 580px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.hero-points { display: grid; grid-template-columns: repeat(3, auto); gap: 22px; margin-top: 38px; max-width: 560px; }
.hero-point { display: flex; align-items: center; gap: 10px; font-size: 14px; color: rgba(255,255,255,0.88); }
.hero-point svg { width: 18px; height: 18px; color: #d9c08a; flex-shrink: 0; }

/* Hero 右侧：碳链分子视觉 */
.hero-visual { position: relative; }
.molecule-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.16);
  border-radius: var(--radius-lg);
  padding: 26px;
  backdrop-filter: blur(8px);
  box-shadow: 0 30px 70px rgba(0,0,0,0.35);
}
.molecule-card .card-title {
  display: flex; align-items: baseline; justify-content: space-between;
  font-family: var(--font-en);
  font-size: 13px; font-weight: 700;
  letter-spacing: 2px; text-transform: uppercase;
  color: rgba(255,255,255,0.75);
  margin-bottom: 18px;
}
.molecule-card .card-title b { color: #d9c08a; font-size: 15px; }

.chain { display: flex; align-items: flex-end; justify-content: space-between; gap: 6px; padding: 8px 2px 0; }
.chain-col { display: flex; flex-direction: column; align-items: center; gap: 6px; flex: 1; }
.chain-bar {
  width: 100%;
  background: linear-gradient(180deg, rgba(217,192,138,0.85), rgba(194,147,61,0.5));
  border-radius: 3px 3px 0 0;
  min-height: 8px;
}
.chain-col label { font-family: var(--font-en); font-size: 11px; font-weight: 700; color: rgba(255,255,255,0.9); letter-spacing: 0.5px; }
.chain-col small { font-size: 9.5px; color: rgba(255,255,255,0.45); font-family: var(--font-en); }
.chain-tip { font-size: 11.5px; color: rgba(255,255,255,0.6); text-align: center; margin: 14px 0 0; font-family: var(--font-en); letter-spacing: 1px; }
.molecule-svg { margin: 20px 0 0; width: 100%; }

/* ============ 数据条 ============ */
.data-strip { background: var(--c-primary-deep); border-top: 1px solid rgba(255,255,255,0.08); }
.data-strip .container { display: grid; grid-template-columns: repeat(4, 1fr); }
.data-item { padding: 26px 18px; text-align: center; border-left: 1px solid rgba(255,255,255,0.09); }
.data-item:first-child { border-left: none; }
.data-item b {
  display: block;
  font-family: var(--font-en);
  font-size: clamp(24px, 2.6vw, 32px);
  font-weight: 800;
  color: #d9c08a;
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}
.data-item span { font-size: 13px; color: rgba(255,255,255,0.7); }

/* ============ 关于我们 ============ */
.about-grid { display: grid; grid-template-columns: 1fr 1.05fr; gap: 56px; align-items: center; }

.about-panel { position: relative; }
.about-panel .panel-head {
  background: var(--c-primary-deep);
  border-radius: var(--radius-lg);
  padding: 34px 30px;
  color: #fff;
  position: relative;
  overflow: hidden;
}
.about-panel .panel-head::before {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 34px 34px;
}
.about-panel .panel-head h3 { position: relative; font-size: 20px; font-weight: 800; letter-spacing: 1px; margin-bottom: 8px; }
.about-panel .panel-head h3 small { display: block; font-family: var(--font-en); font-size: 12px; font-weight: 700; letter-spacing: 3px; color: #d9c08a; margin-top: 4px; text-transform: uppercase; }
.about-panel .panel-head p { position: relative; font-size: 14px; color: rgba(255,255,255,0.8); }
.about-panel .panel-list {
  background: var(--c-bg-alt);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-md);
  margin-top: 16px;
  padding: 8px 0;
  box-shadow: var(--shadow-sm);
}
.about-panel .panel-list li {
  display: flex; align-items: center; gap: 12px;
  padding: 13px 20px;
  font-size: 14.5px;
  border-bottom: 1px dashed var(--c-line-soft);
}
.about-panel .panel-list li:last-child { border-bottom: none; }
.about-panel .panel-list .idx { font-family: var(--font-en); font-size: 12px; font-weight: 800; color: var(--c-accent-deep); width: 22px; flex-shrink: 0; font-variant-numeric: tabular-nums; }

.about-body h2 { font-size: clamp(24px, 3.2vw, 33px); font-weight: 800; color: var(--c-primary-deep); line-height: 1.4; margin-bottom: 18px; }
.about-body h2 .accent { color: var(--c-accent-deep); }
.about-body > p { color: var(--c-text-soft); margin-bottom: 14px; font-size: 15px; }
.about-feature { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 24px; }
.feature-item {
  display: flex; gap: 12px; align-items: flex-start;
  border: 1px solid var(--c-line);
  background: var(--c-bg);
  border-radius: var(--radius-md);
  padding: 16px;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s;
}
.feature-item:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--c-primary-soft); }
.feature-item .icon { width: 38px; height: 38px; border-radius: var(--radius-sm); background: rgba(52,80,107,0.1); display: grid; place-items: center; flex-shrink: 0; }
.feature-item .icon svg { width: 19px; height: 19px; color: var(--c-primary); }
.feature-item h4 { font-size: 15px; font-weight: 700; color: var(--c-primary-deep); margin-bottom: 2px; }
.feature-item p { font-size: 12.5px; color: var(--c-text-soft); margin: 0; }

/* ============ 产品中心 ============ */
.products-note {
  display: flex; gap: 12px; align-items: flex-start;
  background: rgba(194,147,61,0.07);
  border: 1px solid rgba(194,147,61,0.3);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  font-size: 14px;
  color: var(--c-text-soft);
  margin-bottom: 26px;
}
.products-note svg { width: 18px; height: 18px; color: var(--c-accent-deep); flex-shrink: 0; margin-top: 3px; }

.table-wrap {
  background: var(--c-bg-alt);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.product-table { width: 100%; border-collapse: collapse; }
.product-table thead th {
  background: var(--c-primary-deep);
  color: #fff;
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 1px;
  padding: 15px 16px;
  text-align: left;
  white-space: nowrap;
}
.product-table tbody td {
  padding: 15px 16px;
  font-size: 14.5px;
  border-bottom: 1px solid var(--c-line-soft);
  vertical-align: middle;
}
.product-table tbody tr:nth-child(even) { background: #f7f9fb; }
.product-table tbody tr { transition: background 0.2s; }
.product-table tbody tr:hover { background: rgba(52,80,107,0.06); }
.product-table .p-name { font-weight: 700; color: var(--c-primary-deep); }
.product-table .p-name small { display: block; font-family: var(--font-en); font-size: 12px; font-weight: 500; color: var(--c-text-soft); letter-spacing: 0.5px; }
.product-table .cas { font-family: var(--font-en); font-variant-numeric: tabular-nums; color: var(--c-text); }
.product-table .spec { font-size: 13px; color: var(--c-text-soft); }

.product-cards { display: none; }
.p-card {
  background: var(--c-bg-alt);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-md);
  padding: 18px 18px 16px;
  margin-bottom: 14px;
  box-shadow: var(--shadow-sm);
}
.p-card .p-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 10px; margin-bottom: 10px; }
.p-card .p-name { font-size: 16px; font-weight: 700; color: var(--c-primary-deep); }
.p-card .p-name small { display: block; font-family: var(--font-en); font-size: 12px; font-weight: 500; color: var(--c-text-soft); }
.p-card .p-cas { font-family: var(--font-en); font-size: 12.5px; color: var(--c-accent-deep); font-weight: 700; white-space: nowrap; }
.p-card dl { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 12px; margin-bottom: 12px; }
.p-card dl div { display: flex; gap: 8px; font-size: 13.5px; }
.p-card dl dt { color: var(--c-text-soft); flex-shrink: 0; }
.p-card dl dd { font-weight: 600; color: var(--c-text); }

/* ============ 应用领域 ============ */
.app-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.app-item {
  border: 1px solid var(--c-line);
  border-radius: var(--radius-md);
  background: var(--c-bg-alt);
  padding: 24px 20px;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
  position: relative;
  overflow: hidden;
}
.app-item::before {
  content: ""; position: absolute; top: 0; left: 0; bottom: 0;
  width: 3px; background: var(--c-accent);
  transform: scaleY(0); transform-origin: top;
  transition: transform 0.35s var(--ease);
}
.app-item:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.app-item:hover::before { transform: scaleY(1); }
.app-item .icon { width: 46px; height: 46px; border-radius: var(--radius-sm); background: rgba(52,80,107,0.09); display: grid; place-items: center; margin-bottom: 14px; }
.app-item .icon svg { width: 22px; height: 22px; color: var(--c-primary); }
.app-item h3 { font-size: 15.5px; font-weight: 700; color: var(--c-primary-deep); margin-bottom: 6px; }
.app-item p { font-size: 13px; color: var(--c-text-soft); }

/* ============ 供应链优势 ============ */
.adv-section {
  background:
    radial-gradient(720px 380px at 100% 0%, rgba(91,127,160,0.35), transparent 60%),
    var(--c-primary-deep);
  color: #fff;
}
.adv-section .section-title { color: #fff; }
.adv-section .section-sub { color: rgba(255,255,255,0.72); }
.adv-section .section-tag { color: #d9c08a; }
.adv-section .section-tag::before, .adv-section .section-tag::after { background: #d9c08a; }

.adv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.adv-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  transition: transform 0.35s var(--ease), background 0.35s, border-color 0.35s;
}
.adv-card:hover { transform: translateY(-6px); background: rgba(255,255,255,0.1); border-color: rgba(217,192,138,0.5); }
.adv-card .adv-num { font-family: var(--font-en); font-size: 14px; font-weight: 800; color: #d9c08a; letter-spacing: 2px; display: block; margin-bottom: 12px; }
.adv-card .adv-icon { width: 44px; height: 44px; border-radius: var(--radius-sm); background: rgba(217,192,138,0.14); display: grid; place-items: center; margin-bottom: 14px; }
.adv-card .adv-icon svg { width: 21px; height: 21px; color: #d9c08a; }
.adv-card h3 { font-size: 16.5px; font-weight: 700; margin-bottom: 8px; }
.adv-card p { font-size: 13.5px; color: rgba(255,255,255,0.75); }

/* ============ 外贸沟通渠道（导航条） ============ */
.channel-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px; }
.channel-item {
  border: 1px solid var(--c-line);
  border-radius: var(--radius-md);
  background: var(--c-bg-alt);
  padding: 22px 14px;
  text-align: center;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
}
.channel-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--c-primary-soft); }
.channel-item .icon { width: 48px; height: 48px; border-radius: 50%; display: grid; place-items: center; background: rgba(52,80,107,0.08); }
.channel-item .icon svg { width: 22px; height: 22px; color: var(--c-primary); }
.channel-item .icon.wa { background: rgba(37,211,102,0.12); }
.channel-item .icon.wa svg { color: #25d366; }
.channel-item .icon.sk { background: rgba(0,175,240,0.1); }
.channel-item .icon.sk svg { color: #00aff0; }
.channel-item .icon.tm { background: rgba(255,106,0,0.1); }
.channel-item .icon.tm svg { color: #ff6a00; }
.channel-item .icon.em { background: rgba(52,80,107,0.1); }
.channel-item .icon.em svg { color: var(--c-primary); }
.channel-item .icon.wx { background: rgba(9,187,7,0.1); }
.channel-item .icon.wx svg { color: #09bb07; }
.channel-item .icon.li { background: rgba(10,102,194,0.1); }
.channel-item .icon.li svg { color: #0a66c2; }
.channel-item h3 { font-size: 14.5px; font-weight: 700; color: var(--c-primary-deep); }
.channel-item p { font-size: 12px; color: var(--c-text-soft); word-break: break-all; }
.channel-item p.en { font-family: var(--font-en); letter-spacing: 0.5px; }

/* ============ 新闻动态 ============ */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.news-card {
  background: var(--c-bg-alt);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex; flex-direction: column;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.news-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.news-head { padding: 20px 20px 0; display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.news-cat { font-size: 11.5px; font-weight: 700; letter-spacing: 1px; color: var(--c-accent-deep); border: 1px solid rgba(194,147,61,0.4); padding: 3px 10px; border-radius: 3px; }
.news-date { font-family: var(--font-en); font-size: 12.5px; color: var(--c-text-soft); font-variant-numeric: tabular-nums; }
.news-body { padding: 14px 20px 20px; flex: 1; display: flex; flex-direction: column; }
.news-body h3 { font-size: 16px; font-weight: 700; color: var(--c-primary-deep); line-height: 1.55; margin-bottom: 8px; }
.news-body p { font-size: 13.5px; color: var(--c-text-soft); flex: 1; }
.news-body a { margin-top: 12px; font-size: 13.5px; font-weight: 600; color: var(--c-primary); display: inline-flex; align-items: center; gap: 6px; }
.news-body a svg { width: 14px; height: 14px; transition: transform 0.3s; }
.news-body a:hover svg { transform: translateX(5px); }

/* ============ 询价表单 RFQ ============ */
.rfq-section {
  background:
    radial-gradient(760px 420px at 0% 0%, rgba(91,127,160,0.28), transparent 55%),
    var(--c-bg);
}
.rfq-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 40px; align-items: start; }
.rfq-intro { position: sticky; top: calc(var(--header-h) + 24px); }
.rfq-intro h2 { font-size: clamp(24px, 3vw, 32px); font-weight: 800; color: var(--c-primary-deep); line-height: 1.4; margin-bottom: 16px; }
.rfq-intro > p { color: var(--c-text-soft); margin-bottom: 22px; font-size: 15px; }
.rfq-steps { display: flex; flex-direction: column; gap: 14px; }
.rfq-step { display: flex; gap: 14px; align-items: flex-start; }
.rfq-step .num { width: 34px; height: 34px; border-radius: 50%; background: var(--c-primary); color: #fff; font-family: var(--font-en); font-weight: 800; font-size: 15px; display: grid; place-items: center; flex-shrink: 0; }
.rfq-step h4 { font-size: 15px; font-weight: 700; color: var(--c-primary-deep); }
.rfq-step p { font-size: 13px; color: var(--c-text-soft); }
.rfq-fast {
  margin-top: 24px;
  border: 1px dashed rgba(194,147,61,0.5);
  background: rgba(194,147,61,0.06);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  font-size: 13.5px;
  color: var(--c-text-soft);
}
.rfq-fast a { color: var(--c-accent-deep); font-weight: 700; }
.rfq-fast a:hover { text-decoration: underline; }

.rfq-form {
  background: var(--c-bg-alt);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  padding: 34px 32px;
  box-shadow: var(--shadow-md);
}
.rfq-form .form-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 24px; border-bottom: 2px solid var(--c-primary-deep); padding-bottom: 14px; }
.rfq-form .form-head h3 { font-size: 20px; font-weight: 800; color: var(--c-primary-deep); }
.rfq-form .form-head span { font-family: var(--font-en); font-size: 12px; font-weight: 700; letter-spacing: 2px; color: var(--c-accent-deep); text-transform: uppercase; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; color: var(--c-primary-deep); margin-bottom: 7px; }
.form-group label .req { color: #c0392b; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--c-line);
  border-radius: var(--radius-sm);
  background: var(--c-bg);
  color: var(--c-text);
  transition: border-color 0.25s, box-shadow 0.25s, background 0.25s;
  -webkit-appearance: none;
  appearance: none;
}
.form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%235d6e7e' stroke-width='2'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 38px;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(52,80,107,0.12);
  background: #fff;
}
.form-group input::placeholder, .form-group textarea::placeholder { color: #9aa8b6; }
.form-group textarea { min-height: 110px; resize: vertical; }
.form-tip { font-size: 12.5px; color: var(--c-text-soft); margin-top: 12px; display: flex; align-items: center; gap: 6px; }
.form-tip svg { width: 14px; height: 14px; color: var(--c-accent-deep); flex-shrink: 0; }
.btn-submit { width: 100%; margin-top: 8px; padding: 15px; font-size: 16px; }
.form-success {
  display: none;
  background: #eef6f0;
  border: 1px solid #b9ddc5;
  color: #1f6b43;
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  font-size: 14px;
  margin-top: 14px;
  align-items: center;
  gap: 10px;
}
.form-success.show { display: flex; }
.form-success svg { width: 18px; height: 18px; flex-shrink: 0; }

/* ============ 联系我们 ============ */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.contact-block { display: flex; flex-direction: column; gap: 16px; }
.contact-card {
  display: flex; gap: 16px; align-items: flex-start;
  border: 1px solid var(--c-line);
  background: var(--c-bg-alt);
  border-radius: var(--radius-md);
  padding: 20px 22px;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.contact-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.contact-card .icon { width: 46px; height: 46px; border-radius: var(--radius-sm); background: rgba(52,80,107,0.09); display: grid; place-items: center; flex-shrink: 0; }
.contact-card .icon svg { width: 22px; height: 22px; color: var(--c-primary); }
.contact-card h3 { font-size: 15px; font-weight: 700; color: var(--c-primary-deep); margin-bottom: 3px; }
.contact-card p, .contact-card a { font-size: 14.5px; color: var(--c-text-soft); line-height: 1.6; word-break: break-all; }
.contact-card a:hover { color: var(--c-primary); }
.contact-card .icon.hot { background: rgba(194,147,61,0.13); }
.contact-card .icon.hot svg { color: var(--c-accent-deep); }

.channel-panel { border: 1px solid var(--c-line); background: var(--c-bg-alt); border-radius: var(--radius-md); padding: 26px; }
.channel-panel h3 { font-size: 17px; font-weight: 800; color: var(--c-primary-deep); margin-bottom: 4px; }
.channel-panel > p { font-size: 13.5px; color: var(--c-text-soft); margin-bottom: 18px; }
.channel-list { display: flex; flex-direction: column; gap: 12px; }
.channel-line { display: flex; align-items: center; gap: 14px; padding: 12px 14px; border: 1px solid var(--c-line-soft); border-radius: var(--radius-sm); transition: border-color 0.25s, background 0.25s; }
.channel-line:hover { border-color: var(--c-primary-soft); background: var(--c-bg); }
.channel-line .icon { width: 38px; height: 38px; border-radius: 50%; display: grid; place-items: center; flex-shrink: 0; }
.channel-line .icon svg { width: 18px; height: 18px; }
.channel-line .t { flex: 1; }
.channel-line .t b { display: block; font-size: 14.5px; color: var(--c-primary-deep); }
.channel-line .t span { font-size: 12.5px; color: var(--c-text-soft); font-family: var(--font-en); }
.channel-line .v { font-family: var(--font-en); font-size: 14px; font-weight: 700; color: var(--c-text); word-break: break-all; }
.channel-line .v.muted { color: var(--c-text-soft); font-weight: 500; }

/* ============ 页脚 ============ */
.site-footer { background: var(--c-primary-dark); color: rgba(255,255,255,0.72); }
.footer-main { display: grid; grid-template-columns: 1.3fr 0.9fr 1fr 1.2fr; gap: 40px; padding: 60px 0 42px; }
.footer-about .logo { margin-bottom: 16px; }
.footer-about .logo-text strong { color: #fff; }
.footer-about .logo-text small { color: rgba(255,255,255,0.5); }
.footer-about p { font-size: 13.5px; line-height: 1.9; }
.footer-col h4 { color: #fff; font-size: 15.5px; font-weight: 700; margin-bottom: 18px; position: relative; padding-bottom: 10px; }
.footer-col h4::after { content: ""; position: absolute; left: 0; bottom: 0; width: 26px; height: 2px; background: var(--c-accent); }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a { font-size: 13.5px; transition: color 0.25s, padding-left 0.25s; }
.footer-col ul a:hover { color: #d9c08a; padding-left: 6px; }
.footer-contact li { display: flex; gap: 10px; margin-bottom: 13px; font-size: 13.5px; align-items: flex-start; }
.footer-contact svg { width: 15px; height: 15px; color: #d9c08a; flex-shrink: 0; margin-top: 4px; }
.footer-contact a:hover { color: #d9c08a; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding: 18px 0; font-size: 12.5px; text-align: center; }
.footer-bottom a:hover { color: #d9c08a; }

/* ============ 返回顶部 ============ */
.back-top {
  position: fixed; right: 22px; bottom: 22px; z-index: 90;
  width: 46px; height: 46px; border-radius: var(--radius-sm);
  background: var(--c-primary); color: #fff;
  display: grid; place-items: center;
  box-shadow: var(--shadow-md);
  opacity: 0; visibility: hidden; transform: translateY(16px);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease), visibility 0.3s;
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { background: var(--c-primary-deep); transform: translateY(-4px); }
.back-top svg { width: 19px; height: 19px; }

/* ============ 滚动动画 ============ */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in-view { opacity: 1; transform: translateY(0); }
.reveal.d1 { transition-delay: 0.08s; }
.reveal.d2 { transition-delay: 0.16s; }
.reveal.d3 { transition-delay: 0.24s; }
.reveal.d4 { transition-delay: 0.32s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  .reveal { opacity: 1; transform: none; }
}

/* ============ 响应式：平板 ============ */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; gap: 44px; }
  .hero-visual { max-width: 560px; }
  .app-grid { grid-template-columns: repeat(2, 1fr); }
  .channel-grid { grid-template-columns: repeat(3, 1fr); }
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .news-grid { grid-template-columns: repeat(2, 1fr); }
  .rfq-grid { grid-template-columns: 1fr; }
  .rfq-intro { position: static; }
  .footer-main { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}

/* ============ 响应式：手机 ============ */
@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .section-head { margin-bottom: 34px; }
  .topbar .container { justify-content: center; }
  .topbar-info span:nth-child(2), .topbar-info span:nth-child(3) { display: none; }
  .topbar-lang { display: none; }

  .nav-toggle { display: block; }
  .header-cta .btn { display: none; }
  .main-nav {
    position: fixed; inset: 0;
    background: rgba(22,40,58,0.985);
    z-index: 105;
    display: flex; align-items: center; justify-content: center;
    opacity: 0; visibility: hidden;
    transition: opacity 0.35s var(--ease), visibility 0.35s;
  }
  body.menu-open .main-nav { opacity: 1; visibility: visible; }
  .main-nav ul { flex-direction: column; gap: 6px; text-align: center; }
  .main-nav a { color: #fff; font-size: 18px; padding: 12px 36px; }
  .main-nav a::after { background: #d9c08a; }
  .main-nav a:hover, .main-nav a.active { color: #d9c08a; }

  .hero-inner { padding: 48px 0 56px; }
  .hero-actions .btn { width: 100%; }
  .hero-points { grid-template-columns: 1fr; gap: 12px; margin-top: 30px; }

  .data-strip .container { grid-template-columns: repeat(2, 1fr); }
  .data-item { border-left: none; border-bottom: 1px solid rgba(255,255,255,0.08); }
  .data-item:nth-child(odd) { border-right: 1px solid rgba(255,255,255,0.08); }

  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-feature { grid-template-columns: 1fr; }

  .table-wrap { display: none; }
  .product-cards { display: block; }

  .app-grid { grid-template-columns: 1fr; }
  .adv-grid { grid-template-columns: 1fr; }
  .channel-grid { grid-template-columns: repeat(2, 1fr); }
  .news-grid { grid-template-columns: 1fr; }

  .rfq-form { padding: 26px 20px; }
  .form-row { grid-template-columns: 1fr; }
  .footer-main { grid-template-columns: 1fr; gap: 30px; padding: 44px 0 30px; }
  .back-top { right: 16px; bottom: 16px; }
}

/* ============ 产品Tab导航 ============ */
.prod-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-bottom: 40px;
}
.prod-tab {
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 600;
  color: var(--c-text-soft);
  background: var(--c-white);
  border: 2px solid var(--c-line);
  border-radius: var(--radius-md);
  transition: all 0.25s var(--ease);
  white-space: nowrap;
}
.prod-tab:hover { border-color: var(--c-primary-soft); color: var(--c-primary); }
.prod-tab.active {
  background: var(--c-primary-deep);
  color: var(--c-white);
  border-color: var(--c-primary-deep);
  box-shadow: var(--shadow-md);
}
.prod-panel { display: none; animation: fadeIn 0.4s var(--ease); }
.prod-panel.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }

/* 产品详情头部 */
.prod-detail-head {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  margin-bottom: 36px;
  align-items: start;
}
.prod-img-box {
  background: linear-gradient(135deg, #f8fafc, #eef2f7);
  border: 2px dashed var(--c-line);
  border-radius: var(--radius-lg);
  min-height: 280px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 30px;
  position: relative;
  overflow: hidden;
}
.prod-img-box img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  border-radius: var(--radius-md);
}
.prod-img-placeholder {
  text-align: center;
  color: var(--c-text-soft);
}
.prod-img-placeholder svg { width: 56px; height: 56px; margin: 0 auto 12px; opacity: 0.4; }
.prod-img-placeholder p { font-size: 13px; line-height: 1.6; }
.prod-img-placeholder .img-hint { font-size: 11px; color: var(--c-line); margin-top: 6px; }
.prod-info h3 { font-size: 24px; font-weight: 700; color: var(--c-primary-deep); margin-bottom: 4px; }
.prod-info .prod-en { font-size: 15px; color: var(--c-primary-soft); margin-bottom: 16px; font-family: var(--font-en); }
.prod-info .prod-desc { font-size: 15px; line-height: 1.8; color: var(--c-text-soft); margin-bottom: 20px; }
.prod-uses {
  background: rgba(52, 80, 107, 0.06);
  border-left: 4px solid var(--c-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 14px 18px;
}
.prod-uses h4 { font-size: 14px; font-weight: 700; color: var(--c-primary); margin-bottom: 6px; }
.prod-uses p { font-size: 14px; color: var(--c-text-soft); line-height: 1.7; }
.prod-spec-note {
  margin-top: 16px;
  padding: 12px 16px;
  background: rgba(194, 147, 61, 0.08);
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--c-accent-deep);
  line-height: 1.6;
}

/* ============ 价格走势版块 ============ */
.price-section { background: var(--c-primary-dark); color: var(--c-white); }
.price-section .section-title { color: var(--c-white); }
.price-section .section-tag { background: rgba(194,147,61,0.15); color: var(--c-accent); border-color: rgba(194,147,61,0.3); }
.price-section .section-sub { color: rgba(255,255,255,0.7); }
.price-desc {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 32px;
  font-size: 15px;
  color: rgba(255,255,255,0.75);
  line-height: 1.8;
}
.price-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-bottom: 28px;
}
.price-tab {
  padding: 8px 18px;
  font-size: 14px;
  font-weight: 600;
  color: rgba(255,255,255,0.6);
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-md);
  transition: all 0.25s var(--ease);
  white-space: nowrap;
}
.price-tab:hover { color: var(--c-white); background: rgba(255,255,255,0.15); }
.price-tab.active { color: var(--c-primary-dark); background: var(--c-accent); border-color: var(--c-accent); }
.chart-wrap {
  background: rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  padding: 28px 24px 20px;
  border: 1px solid rgba(255,255,255,0.1);
}
.chart-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: 4px;
}
.chart-meta {
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  margin-bottom: 16px;
}
.chart-container {
  position: relative;
  height: 360px;
  width: 100%;
}
.price-disclaimer {
  text-align: center;
  font-size: 12px;
  color: rgba(255,255,255,0.4);
  margin-top: 20px;
  line-height: 1.6;
}

/* 移动端产品详情 */
@media (max-width: 768px) {
  .prod-detail-head { grid-template-columns: 1fr; gap: 20px; }
  .prod-img-box { min-height: 200px; }
  .prod-img-box img { height: 200px; }
  .prod-tab { padding: 8px 14px; font-size: 13px; }
  .chart-container { height: 260px; }
  .price-tab { padding: 6px 12px; font-size: 12px; }
  .chart-wrap { padding: 18px 14px 14px; }
}

/* ================================================================
   ===== 多页改造新增（v2）=====
   面包屑 / 内页横幅 / 产品卡片网格 / 新闻列表
   文章正文排版 / 产品页相邻导航 / 桌面导航下拉
   ================================================================ */

/* ---- 内页横幅 ---- */
.page-hero {
  padding: 132px 0 52px;
  background:
    radial-gradient(800px 420px at 85% -20%, rgba(91,127,160,0.45), transparent 60%),
    linear-gradient(135deg, var(--c-primary-dark) 0%, var(--c-primary-deep) 60%, var(--c-primary) 100%);
  color: var(--c-white);
}
.page-hero h1 {
  font-size: 34px;
  font-weight: 800;
  letter-spacing: 1px;
  margin: 8px 0 10px;
}
.page-hero .page-sub {
  font-size: 15px;
  color: rgba(255,255,255,0.68);
  max-width: 720px;
  line-height: 1.8;
}

/* ---- 面包屑 ---- */
.breadcrumb {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}
.breadcrumb a { color: rgba(255,255,255,0.78); transition: color 0.2s; }
.breadcrumb a:hover { color: var(--c-accent); }
.breadcrumb .sep { opacity: 0.5; }
.breadcrumb .cur { color: var(--c-accent); }

/* ---- 产品卡片网格（首页产品区 + 产品页底部推荐）---- */
.prod-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.prod-card {
  display: flex;
  flex-direction: column;
  background: var(--c-bg-alt);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.prod-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}
.prod-card-img {
  position: relative;
  height: 190px;
  background: linear-gradient(135deg, #e8eef4, #d7e2ec);
  overflow: hidden;
}
.prod-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s var(--ease); }
.prod-card:hover .prod-card-img img { transform: scale(1.05); }
.prod-card-body { padding: 22px 22px 24px; flex: 1; display: flex; flex-direction: column; }
.prod-card-body h3 { font-size: 19px; font-weight: 700; color: var(--c-primary-deep); margin-bottom: 8px; }
.prod-card-body h3 small { display: block; font-size: 12px; font-weight: 500; color: var(--c-text-soft); font-family: var(--font-en); letter-spacing: 0.5px; margin-top: 2px; }
.prod-card-body p { font-size: 14px; color: var(--c-text-soft); line-height: 1.75; flex: 1; }
.prod-card-more {
  margin-top: 14px;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.prod-card:hover .prod-card-more { color: var(--c-accent-deep); }

/* ---- 新闻列表（首页新闻区 + 新闻列表页）---- */
.news-list { display: grid; gap: 20px; }
.news-item {
  display: flex;
  gap: 22px;
  padding: 24px;
  background: var(--c-bg-alt);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.news-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.news-date {
  flex-shrink: 0;
  width: 74px;
  height: 74px;
  border-radius: var(--radius-md);
  background: var(--c-primary-deep);
  color: var(--c-white);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  line-height: 1.2;
}
.news-date b { font-size: 26px; font-family: var(--font-en); }
.news-date span { font-size: 11px; opacity: 0.7; }
.news-item-body { flex: 1; min-width: 0; }
.news-item-body .news-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--c-accent-deep);
  background: rgba(194,147,61,0.12);
  padding: 2px 10px;
  border-radius: 999px;
  margin-bottom: 8px;
}
.news-item-body h3 { font-size: 18px; font-weight: 700; color: var(--c-primary-deep); margin-bottom: 6px; }
.news-item-body h3 a:hover { color: var(--c-primary); }
.news-item-body p { font-size: 14px; color: var(--c-text-soft); line-height: 1.75; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-item-body .news-read { margin-top: 10px; font-size: 13px; font-weight: 600; color: var(--c-primary); }

/* ---- 文章正文排版（新闻文章页 / 关于页共用）---- */
.article-wrap {
  max-width: 860px;
  margin: 0 auto;
  background: var(--c-bg-alt);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 44px 48px;
}
.article-head { margin-bottom: 28px; padding-bottom: 24px; border-bottom: 1px solid var(--c-line-soft); }
.article-head h1 { font-size: 27px; font-weight: 800; color: var(--c-primary-deep); line-height: 1.45; margin-bottom: 12px; }
.article-meta { font-size: 13px; color: var(--c-text-soft); display: flex; flex-wrap: wrap; gap: 18px; }
.article-body { font-size: 16px; line-height: 1.95; color: var(--c-text); }
.article-body h2 {
  font-size: 21px;
  font-weight: 700;
  color: var(--c-primary-deep);
  margin: 34px 0 14px;
  padding-left: 14px;
  border-left: 4px solid var(--c-accent);
}
.article-body h3 { font-size: 18px; font-weight: 700; color: var(--c-primary-deep); margin: 26px 0 10px; }
.article-body p { margin-bottom: 16px; }
.article-body ul, .article-body ol { margin: 0 0 16px 4px; }
.article-body ul { list-style: none; }
.article-body ul li { position: relative; padding-left: 22px; margin-bottom: 8px; }
.article-body ul li::before {
  content: "";
  position: absolute;
  left: 4px; top: 12px;
  width: 7px; height: 7px;
  border-radius: 2px;
  background: var(--c-accent);
}
.article-body strong { color: var(--c-primary-deep); }
.article-body table { width: 100%; border-collapse: collapse; margin: 18px 0 22px; font-size: 14px; }
.article-body th, .article-body td { border: 1px solid var(--c-line); padding: 10px 14px; text-align: left; }
.article-body th { background: #eef3f7; font-weight: 700; color: var(--c-primary-deep); }
.article-body img { border-radius: var(--radius-md); margin: 18px 0; }
.article-back { margin-top: 36px; text-align: center; }

/* ---- 产品页相邻导航（上一个/下一个产品）---- */
.prod-siblings {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 860px;
  margin: 44px auto 0;
}
.prod-sibling {
  display: block;
  padding: 18px 22px;
  background: var(--c-bg-alt);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: border-color 0.25s, transform 0.25s var(--ease);
}
.prod-sibling:hover { border-color: var(--c-accent); transform: translateY(-3px); }
.prod-sibling small { display: block; font-size: 12px; color: var(--c-text-soft); margin-bottom: 4px; }
.prod-sibling b { font-size: 15px; color: var(--c-primary-deep); }
.prod-sibling.next { text-align: right; }

/* ---- 桌面导航下拉（产品中心）---- */
.nav-item-has-sub { position: relative; }
.nav-sub {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  min-width: 210px;
  background: var(--c-white);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s var(--ease), transform 0.25s var(--ease), visibility 0.25s;
  z-index: 120;
}
.nav-item-has-sub:hover .nav-sub,
.nav-item-has-sub:focus-within .nav-sub {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(2px);
}
.nav-sub a {
  display: block;
  padding: 9px 14px;
  font-size: 14px;
  color: var(--c-text);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}
.nav-sub a::after { display: none; }
.nav-sub a:hover { background: #eef3f7; color: var(--c-primary-deep); }

/* ---- v2 移动端断点 ---- */
@media (max-width: 768px) {
  .page-hero { padding: 108px 0 36px; }
  .page-hero h1 { font-size: 25px; }
  .page-hero .page-sub { font-size: 13.5px; }
  .prod-cards { grid-template-columns: 1fr; gap: 18px; }
  .prod-card-img { height: 170px; }
  .news-item { flex-direction: column; gap: 14px; padding: 18px; }
  .article-wrap { padding: 26px 20px; }
  .article-head h1 { font-size: 21px; }
  .article-body { font-size: 15px; line-height: 1.85; }
  .article-body h2 { font-size: 18px; margin: 26px 0 12px; }
  .prod-siblings { grid-template-columns: 1fr; gap: 12px; }
  .nav-sub {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    background: transparent;
    border: none;
    box-shadow: none;
    padding: 0;
    min-width: 0;
  }
  .nav-sub a { color: rgba(255,255,255,0.72); font-size: 15px; padding: 6px 10px; text-align: center; }
  .nav-sub a:hover { background: rgba(255,255,255,0.08); color: #d9c08a; }
}
@media (min-width: 769px) and (max-width: 1000px) {
  .prod-cards { grid-template-columns: repeat(2, 1fr); }
}