/* ========== 山东易云网络 - 深蓝色主题 ========== */
:root {
  --primary: #1e40af;
  --primary-dark: #1e3a8a;
  --primary-darker: #172554;
  --primary-light: #dbeafe;
  --primary-light-bg: #eff6ff;
  --accent: #3b82f6;
  --accent-light: #93c5fd;
  --text: #0f172a;
  --text-secondary: #475569;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --border: #e2e8f0;
  --shadow: 0 1px 3px rgba(30, 64, 175, .08);
  --shadow-hover: 0 8px 24px rgba(30, 64, 175, .18);
  --radius: 12px;
  --radius-sm: 8px;
  --max-width: 1140px;
  --header-h: 60px;
  --transition: .25s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  /* smooth 在部分国产浏览器中与脚本滚动叠加会「每次只动一截」，同页锚点改为 auto 更稳 */
  scroll-behavior: auto;
  font-size: 16px;
  /* 勿在 html 上设 overflow-x:hidden，部分浏览器下同页 # 锚点滚动会失效；横向裁剪放在 body */
  /* 锚点跳转时预留 sticky 顶栏高度，避免标题被挡 */
  scroll-padding-top: calc(var(--header-h) + 12px);
}
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

/* ========== Header ========== */
.site-header {
  position: sticky; top: 0; z-index: 1000;
  background: rgba(255, 255, 255, .98);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: var(--header-h);
  box-shadow: 0 1px 0 rgba(30, 64, 175, .06);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: var(--header-h);
  gap: 12px;
  min-width: 0;
}
.site-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.2rem; font-weight: 700; color: var(--text);
  position: relative;
  z-index: 1;
  flex: 0 1 auto;
  min-width: 0;
  max-width: min(100%, 400px);
  overflow: hidden;
}
.site-logo:hover { color: var(--primary); }
.site-logo > span:not(.logo-icon) {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.logo-icon {
  width: 38px; height: 38px;
  background: linear-gradient(145deg, var(--primary) 0%, var(--primary-dark) 100%);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 1rem; font-weight: 800;
  box-shadow: 0 4px 12px rgba(30, 64, 175, .35);
}
.logo-slogan { font-size: .7rem; font-weight: 400; color: var(--text-secondary); margin-left: 6px; }
.main-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  position: relative;
  z-index: 2;
  /* 勿用 min-width:0：顶栏挤不下时会把导航压扁，各 <a> 点击区重叠，表现为点到「解决方案」 */
  flex-shrink: 0;
}
.main-nav a {
  flex-shrink: 0;
  white-space: nowrap;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  color: var(--text-secondary);
  font-weight: 500;
  transition: background var(--transition), color var(--transition);
  touch-action: manipulation;
}
.main-nav a:hover, .main-nav a.active {
  background: var(--primary-light); color: var(--primary);
}
/* 首页「核心优势」：提高层级避免与相邻「首页」命中区重叠；样式与其它顶栏链一致 */
.main-nav .nav-advantage-link {
  position: relative;
  z-index: 55;
}
.nav-cta { background: linear-gradient(135deg, var(--primary), var(--primary-dark)) !important; color: #fff !important; }
.nav-cta:hover { background: var(--primary-dark) !important; color: #fff !important; box-shadow: 0 4px 14px rgba(30, 64, 175, .4); }
.menu-toggle {
  display: none; background: none; border: none; cursor: pointer;
  padding: 8px; color: var(--text);
}
.menu-toggle svg { width: 24px; height: 24px; }

/* 桌面顶栏：grid + 足够 gap；从左到右 z-index 递增，叠层时右侧链接优先接收点击（避免「首页」盖住「核心优势」） */
@media (min-width: 769px) {
  .site-logo {
    z-index: 0;
  }
  .main-nav {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    gap: 20px;
    align-items: center;
    z-index: 50;
    isolation: isolate;
  }
  .main-nav > a {
    position: relative;
    justify-self: center;
    padding: 6px 10px;
  }
  .main-nav > *:nth-child(1) { z-index: 1; }
  .main-nav > *:nth-child(2) { z-index: 2; }
  .main-nav > *:nth-child(3) { z-index: 3; }
  .main-nav > *:nth-child(4) { z-index: 4; }
  .main-nav > *:nth-child(5) { z-index: 5; }
  .main-nav > *:nth-child(6) { z-index: 6; }
  .main-nav > *:nth-child(7) { z-index: 7; }
  .main-nav > *:nth-child(8) { z-index: 8; }
  .main-nav > *:nth-child(9) { z-index: 9; }
  .main-nav > *:nth-child(10) { z-index: 10; }
  /* 必须写在 nth-child 之后，否则 z-index:2 会盖掉上面的 55，核心优势又会被「首页」压住 */
  .main-nav > a.nav-advantage-link {
    z-index: 60;
  }
}

/* ========== Hero ========== */
.hero {
  background: linear-gradient(135deg, #1e40af 0%, #1e3a8a 45%, #172554 100%);
  color: #fff; padding: 60px 0 72px; text-align: center;
  position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: .6;
}
.hero::after {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(255, 255, 255, .15) 0%, transparent 50%);
}
.hero .container { position: relative; z-index: 1; }
.hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.35rem);
  margin-bottom: 16px; font-weight: 800;
  letter-spacing: -0.02em; line-height: 1.3;
  text-shadow: 0 2px 20px rgba(0, 0, 0, .15);
}
.hero p { font-size: 1.02rem; opacity: .94; max-width: 580px; margin: 0 auto 28px; line-height: 1.75; }
.hero-buttons { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; margin-top: 28px; }
.hero-btn {
  display: inline-block; padding: 14px 32px; border-radius: 28px;
  font-weight: 600; font-size: .95rem; transition: all var(--transition);
}
.hero-btn-primary {
  background: #fff; color: var(--primary);
  box-shadow: 0 4px 20px rgba(0, 0, 0, .2);
}
.hero-btn-primary:hover {
  background: var(--primary-light); color: var(--primary-dark);
  transform: translateY(-2px); box-shadow: 0 6px 24px rgba(0, 0, 0, .25);
}
.hero-btn-secondary {
  background: rgba(255, 255, 255, .12); color: #fff;
  border: 2px solid rgba(255, 255, 255, .45);
}
.hero-btn-secondary:hover {
  background: rgba(255, 255, 255, .22); border-color: rgba(255, 255, 255, .8);
}

/* ========== Section ========== */
.section { padding: 52px 0; }
/* 锚点滚动时标题不被 sticky 顶栏遮挡（与 html scroll-padding 双保险） */
#advantage {
  scroll-margin-top: calc(var(--header-h) + 12px);
}
.section-alt { background: var(--primary-light-bg); }
.section-title {
  font-size: 1.65rem; font-weight: 700; text-align: center; margin-bottom: 10px;
  color: var(--text);
}
.section-subtitle {
  text-align: center; color: var(--text-secondary);
  margin-bottom: 36px; font-size: .98rem; max-width: 560px; margin-left: auto; margin-right: auto;
}

/* ========== Service Cards ========== */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}
.cat-card {
  display: flex; flex-direction: column; align-items: center;
  padding: 30px 22px; border-radius: var(--radius);
  border: 1px solid var(--border);
  text-align: center; transition: all var(--transition);
  background: var(--bg); color: var(--text);
}
.cat-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}
a.cat-card { text-decoration: none; color: inherit; display: flex; }
.cat-card .cat-icon { font-size: 2.25rem; margin-bottom: 14px; line-height: 1; }
.cat-card h3 { font-size: 1.08rem; font-weight: 600; margin-bottom: 8px; color: var(--text); }
.cat-card p { font-size: .86rem; color: var(--text-secondary); margin-top: 4px; line-height: 1.6; }
.cat-card-cta {
  border-color: var(--primary);
  background: linear-gradient(to bottom, rgba(30, 64, 175, .06), var(--bg));
}
.cat-card-cta:hover { box-shadow: 0 8px 28px rgba(30, 64, 175, .22); }

/* ========== Page Banner ========== */
.page-banner {
  background: linear-gradient(135deg, #1e40af 0%, #1e3a8a 100%);
  color: #fff; padding: 44px 0; text-align: center;
  position: relative;
}
.page-banner::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(to bottom, transparent 0%, rgba(0,0,0,.08) 100%);
}
.page-banner .container { position: relative; z-index: 1; }
.page-banner h1 { font-size: 1.8rem; font-weight: 700; margin-bottom: 8px; }
.page-banner p { opacity: .92; font-size: .98rem; }

/* ========== Breadcrumb ========== */
.breadcrumb {
  padding: 14px 0; font-size: .85rem; color: var(--text-secondary);
  display: flex; flex-wrap: wrap; gap: 4px; align-items: center;
}
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { color: var(--text); }

/* ========== Main Content ========== */
.main-content { padding: 28px 0 52px; }
.content-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
  padding: 24px 0;
  /* 避免侧栏与正文列被拉成同高后，个别环境下封面图被纵向拉伸 */
  align-items: start;
}
.article-body { min-width: 0; }
/* 文章封面（页内大图，与 og:image 使用同一文件时可共用 URL） */
.article-body .article-cover {
  margin: 0 0 22px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-alt, #f8fafc);
  display: block;
}
.article-body .article-cover img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto !important;
  max-height: none !important;
  min-height: 0;
  aspect-ratio: auto;
  vertical-align: middle;
}
/* 正文插图 + 图说 */
.article-body figure.article-figure {
  margin: 22px 0;
  max-width: 100%;
}
.article-body figure.article-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto !important;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.article-body figure.article-figure figcaption {
  margin-top: 10px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
  text-align: center;
}
.article-body h1 { font-size: 1.75rem; margin-bottom: 12px; line-height: 1.35; }
.article-body h2 {
  font-size: 1.38rem; margin: 30px 0 14px; padding-bottom: 8px;
  border-bottom: 2px solid var(--primary-light);
}
.article-body h3 { font-size: 1.12rem; margin: 22px 0 10px; }
.article-body p { margin-bottom: 14px; }
.article-body ul, .article-body ol { margin: 12px 0 18px 22px; }
.article-body li { margin-bottom: 6px; list-style: disc; }
.article-body ol li { list-style: decimal; }
.article-body h3 + .article-table-wrap {
  margin-top: 14px;
}
.article-body .article-table-wrap {
  margin: 24px 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 2px solid #64748b;
  border-radius: var(--radius-sm);
  background: #e2e8f0;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.08);
  padding: 12px;
}
.article-body table.article-data-table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  font-size: 0.88rem;
  line-height: 1.85;
  border: 2px solid #475569;
  background: #fff;
  box-shadow: 0 1px 0 rgba(71, 85, 105, 0.15);
}
.article-body table.article-data-table caption {
  caption-side: top;
  text-align: center;
  font-weight: 600;
  margin: 0;
  padding: 22px 28px;
  color: var(--text);
  background: #dbeafe;
  border-bottom: 2px solid #64748b;
  font-size: 0.95rem;
  line-height: 1.6;
}
.article-body table.article-data-table thead th {
  text-align: center;
  padding: 20px 24px;
  color: var(--text);
  font-weight: 600;
  background: #f1f5f9;
  border: 2px solid #64748b;
  border-bottom: 3px solid #1e40af;
  vertical-align: middle;
  line-height: 1.55;
}
.article-body table.article-data-table tbody th,
.article-body table.article-data-table tbody td {
  padding: 28px 32px;
  text-align: left;
  vertical-align: top;
  border: 2px solid #94a3b8;
  line-height: 1.88;
}
.article-body table.article-data-table tbody th {
  font-weight: 600;
  background: #e8eef5;
  color: var(--text);
}
.article-body table.article-data-table tbody td {
  background: #ffffff;
  word-wrap: break-word;
  overflow-wrap: break-word;
}
.article-body table.article-data-table tbody tr:nth-child(even) td {
  background: #f8fafc;
}
/* 通用表格（无 article-data-table 类时仍保留基础格线） */
.article-body table:not(.article-data-table) {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 0.92rem;
}
.article-body table:not(.article-data-table) caption {
  caption-side: top;
  text-align: left;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text);
}
.article-body table:not(.article-data-table) th,
.article-body table:not(.article-data-table) td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}
.article-body table:not(.article-data-table) thead th {
  background: var(--primary-light-bg);
  color: var(--text);
  font-weight: 600;
}
.article-meta { display: flex; gap: 16px; color: var(--text-secondary); font-size: .85rem; margin-bottom: 20px; flex-wrap: wrap; }

/* ========== FAQ ========== */
.faq-item {
  border: 1px solid var(--border); border-radius: var(--radius);
  margin-bottom: 12px; overflow: hidden;
}
.faq-question {
  width: 100%; background: none; border: none;
  padding: 16px 20px; text-align: left;
  font-size: .98rem; font-weight: 600; color: var(--text);
  cursor: pointer; display: flex; justify-content: space-between; align-items: center;
  transition: background var(--transition);
}
.faq-question:hover { background: var(--bg-alt); }
.faq-question::after { content: '+'; font-size: 1.2rem; color: var(--primary); font-weight: 700; transition: transform var(--transition); }
.faq-item.active .faq-question::after { content: '−'; }
.faq-item.active .faq-question { background: var(--primary-light); color: var(--primary); }
.faq-answer { padding: 0 20px; max-height: 0; overflow: hidden; transition: max-height .35s ease, padding .35s ease; }
.faq-item.active .faq-answer { max-height: 800px; padding: 0 20px 20px; overflow-y: auto; }
.faq-answer p { color: var(--text-secondary); font-size: .9rem; line-height: 1.75; margin-bottom: 10px; }
.faq-answer p:last-child { margin-bottom: 0; }

/* ========== Article List ========== */
.article-list { display: flex; flex-direction: column; gap: 18px; }
.article-list-item {
  display: block; padding: 22px 24px;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius); transition: all var(--transition);
}
.article-list-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-hover);
}
.article-list-item h3 { font-size: 1.06rem; margin-bottom: 6px; color: var(--text); }
.article-list-item .meta { font-size: .82rem; color: var(--text-secondary); margin-bottom: 6px; }
.article-list-item p { font-size: .9rem; color: var(--text-secondary); margin: 0; }

/* ========== Card Grid (contact etc) ========== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 22px;
  margin-bottom: 36px;
}
.card {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 26px;
  transition: all var(--transition);
}
.card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-hover);
}
.card h3 { font-size: 1rem; margin-bottom: 10px; color: var(--primary); }
.card p { font-size: .9rem; color: var(--text-secondary); margin-bottom: 4px; }
.card p a { font-weight: 600; }

/* ========== Contact Form ========== */
.contact-form { max-width: 560px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: .9rem; font-weight: 500; margin-bottom: 6px; color: var(--text); }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 12px 14px; border: 1px solid var(--border);
  border-radius: var(--radius-sm); font-size: .95rem; font-family: inherit;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(30, 64, 175, .12);
}
.form-group textarea { min-height: 120px; resize: vertical; }
.btn {
  display: inline-block; padding: 12px 28px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff; border: none; border-radius: var(--radius-sm);
  font-size: 1rem; font-weight: 600; cursor: pointer; font-family: inherit;
  transition: all var(--transition);
  box-shadow: 0 2px 10px rgba(30, 64, 175, .3);
}
.btn:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(30, 64, 175, .35);
}

/* ========== Sidebar ========== */
.sidebar { position: sticky; top: 76px; align-self: start; }
.sidebar-block {
  background: var(--bg-alt); border-radius: var(--radius);
  padding: 22px; margin-bottom: 22px;
  border: 1px solid var(--border);
}
.sidebar-block h3 {
  font-size: 1rem; font-weight: 600; margin-bottom: 14px; padding-bottom: 8px;
  border-bottom: 2px solid var(--primary);
}
.sidebar-block ul li { margin-bottom: 10px; }
.sidebar-block ul li a { font-size: .9rem; color: var(--text-secondary); }
.sidebar-block ul li a:hover { color: var(--primary); }

/* ========== CTA Section ========== */
.cta-section {
  background: linear-gradient(135deg, #1e40af 0%, #1e3a8a 100%);
  color: #fff; padding: 52px 0; text-align: center;
  position: relative;
}
.cta-section::after {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse 70% 80% at 50% 100%, rgba(0,0,0,.12) 0%, transparent 60%);
}
.cta-section .container { position: relative; z-index: 1; }
.cta-section h2 { font-size: 1.55rem; margin-bottom: 10px; font-weight: 700; }
.cta-section p { opacity: .92; margin-bottom: 24px; font-size: .98rem; }
.btn-primary {
  display: inline-block; background: #fff; color: var(--primary);
  padding: 14px 36px; border-radius: 28px;
  font-weight: 700; font-size: .98rem;
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(0, 0, 0, .2);
}
.btn-primary:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0, 0, 0, .25);
}

/* ========== Footer ========== */
.site-footer {
  background: linear-gradient(180deg, #0f172a 0%, #0c1222 100%);
  color: #94a3b8; padding: 44px 0 0;
  border-top: 1px solid rgba(30, 64, 175, .2);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 32px;
}
.footer-col h4 { color: #f1f5f9; margin-bottom: 14px; font-size: 1.02rem; font-weight: 600; }
.footer-col p { font-size: .88rem; line-height: 1.75; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { color: #94a3b8; font-size: .88rem; }
.footer-col ul li a:hover { color: #fff; }
.footer-friendlinks {
  text-align: center;
  font-size: .85rem;
  color: #94a3b8;
  padding: 0 0 24px;
  line-height: 1.65;
}
.footer-friendlinks a {
  color: #94a3b8;
  text-decoration: none;
}
.footer-friendlinks a:hover { color: #fff; text-decoration: underline; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .06);
  padding: 20px 0; text-align: center; font-size: .82rem;
}
.footer-bottom a { color: #94a3b8; }
.footer-bottom a:hover { color: #fff; }
.footer-bottom .beian { font-size: .78rem; color: #64748b; margin-top: 6px; white-space: nowrap; }
.footer-bottom .beian img { margin-right: 4px; vertical-align: middle; }

/* ========== Responsive ========== */
@media (min-width: 769px) {
  /*
   * Logo 外层是整块 <a>，宽屏下文字溢出时仍会参与点击检测，盖住右侧「首页」「核心优势」。
   * 仅「易」字图标接收点击回首页；公司名称区域穿透，避免挡导航。
   */
  .site-logo {
    pointer-events: none;
    cursor: default;
  }
  .site-logo > span:not(.logo-icon) {
    pointer-events: none;
  }
  .site-logo .logo-icon {
    pointer-events: auto;
    cursor: pointer;
  }
}
@media (min-width: 769px) and (max-width: 1024px) {
  .site-logo {
    max-width: min(100%, 280px);
  }
}
@media (max-width: 992px) {
  .content-layout { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .site-logo {
    max-width: none;
    overflow: visible;
    pointer-events: auto;
    cursor: pointer;
  }
  .site-logo > span:not(.logo-icon) {
    white-space: normal;
    text-overflow: clip;
    overflow: visible;
    pointer-events: auto;
  }
  .menu-toggle { display: flex; align-items: center; justify-content: center; }
  .main-nav {
    position: fixed; top: var(--header-h); left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--border);
    flex-direction: column; padding: 16px;
    box-shadow: 0 8px 24px rgba(30, 64, 175, .12);
    display: none;
  }
  .main-nav.open { display: flex; }
  .main-nav > a {
    z-index: auto;
  }
  .main-nav a { padding: 12px 16px; width: 100%; text-align: center; }
  .hero { padding: 44px 0 56px; }
  .section { padding: 40px 0; }
  .cat-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .page-banner h1 { font-size: 1.55rem; }
  .page-banner { padding: 36px 0; }
}
@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero h1 { font-size: 1.4rem; }
  .hero-buttons { flex-direction: column; }
  .hero-btn { width: 100%; text-align: center; }
}