/* ============================================
   中山中互高压电器有限公司 — 官方网站
   品牌色：蓝白工业科技风格 | 简洁丝滑排版
   ============================================ */

/* -------- CSS Variables -------- */
:root {
  --color-primary: #1565C0;
  --color-primary-dark: #0D47A1;
  --color-primary-light: #1E88E5;
  --color-accent: #42A5F5;
  --color-bg-light: #F0F5FB;
  --color-bg-page: #F7F8FA;
  --color-bg-white: #FFFFFF;
  --color-text: #1A1A2E;
  --color-text-secondary: #455A64;
  --color-text-light: #78909C;
  --color-border: #D6E4F0;
  --color-footer: #0A1929;

  --font-main: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;

  --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 6px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.10);
  --shadow-card: 0 2px 16px rgba(21,101,192,0.08);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --max-width: 1200px;
  --header-height: 72px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* -------- Reset & Base -------- */
*,*::before,*::after{ margin:0; padding:0; box-sizing:border-box; }

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-bg-page);
  min-width: 320px;
}

a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-dark); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* -------- Container -------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 28px;
}

/* ============================================
   TOP CONTACT BAR — 全部高亮白色
   ============================================ */
.top-bar {
  background: linear-gradient(90deg, #081B4B 0%, #0D47A1 30%, #1565C0 70%, #0D47A1 100%);
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  z-index: 1001;
  border-bottom: 2px solid #1E88E5;
  min-height: 44px;
  letter-spacing: 0.3px;
}

.top-bar-inner {
  display: flex;
  align-items: stretch;
  justify-content: flex-end;
  gap: 0;
  min-height: 44px;
}

.top-bar-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 18px;
  border-right: 1px solid rgba(255,255,255,0.12);
  white-space: nowrap;
  color: #ffffff;
}

.top-bar-item svg {
  flex-shrink: 0;
  color: #90CAF9;
  width: 14px;
  height: 14px;
}

.top-bar-item a,
.top-bar-item span {
  color: #ffffff;
  font-weight: 500;
}

.top-bar-item a:hover {
  color: #BBDEFB;
}

/* 地址 — 靠左 */
.top-bar-item.highlight-addr {
  margin-right: auto;
  color: #ffffff;
  font-weight: 500;
}

.top-bar-item.highlight-addr svg { color: #64B5F6; }
.top-bar-item.highlight-addr span { color: #ffffff; }

/* 邮箱 */
.top-bar-item.highlight-email a {
  color: #ffffff;
  font-weight: 500;
}
.top-bar-item.highlight-email a:hover { color: #BBDEFB; }

/* 电话 — 最醒目 */
.top-bar-item.highlight-phone {
  background: rgba(255,255,255,0.10);
  border-left: 3px solid #FFD54F;
}

.top-bar-item.highlight-phone a {
  color: #FFE082;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 1px;
}
.top-bar-item.highlight-phone a:hover { color: #fff; }

.top-bar-item.highlight-phone svg {
  color: #FFD54F;
  width: 17px;
  height: 17px;
}

/* 传真 — 白色不加暗 */
.top-bar-item .fax-text {
  color: #ffffff;
  font-size: 13px;
  font-weight: 500;
}

/* 询盘按钮 */
.top-bar .btn-quote {
  background: #FFC107;
  color: #081B4B;
  padding: 0 22px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.5px;
  display: flex;
  align-items: center;
  transition: background 0.2s;
  border: none;
  text-decoration: none;
}
.top-bar .btn-quote:hover {
  background: #FFD54F;
  color: #081B4B;
}

body.has-top-bar .hero {
  margin-top: calc(var(--header-height) + 44px);
}

@media (max-width: 768px) {
  .top-bar { font-size: 12px; min-height: auto; }
  .top-bar-inner {
    flex-wrap: wrap;
    justify-content: center;
    min-height: auto;
    padding: 6px 0;
    gap: 0;
  }
  .top-bar-item {
    padding: 5px 10px;
    border-right: none;
  }
  .top-bar-item.highlight-phone a { font-size: 14px; }
  body.has-top-bar .hero { margin-top: calc(var(--header-height) + 0px); }
}

/* ============================================
   HEADER / NAVIGATION
   ============================================ */
.header {
  position: fixed;
  top: 44px;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-xs);
  z-index: 1000;
  transition: box-shadow var(--transition);
}
.header.scrolled {
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo-img {
  height: 44px;
  width: auto;
}

/* Navigation */
.nav-list {
  display: flex;
  align-items: center;
  gap: 38px;
}

.nav-list a {
  color: var(--color-text);
  font-size: 15px;
  font-weight: 500;
  position: relative;
  padding: 6px 0;
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
  transition: all var(--transition);
  transform: translateX(-50%);
}

.nav-list a:hover,
.nav-list a.active {
  color: var(--color-primary);
}

.nav-list a:hover::after,
.nav-list a.active::after {
  width: 70%;
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 6px;
}
.menu-toggle span {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ============================================
   SECTION BASE
   ============================================ */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-header h2 {
  font-size: 34px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 14px;
  letter-spacing: 1px;
}

.section-header p {
  color: var(--color-text-secondary);
  font-size: 17px;
  margin: 0 auto;
  max-width: 600px;
}

/* ============================================
   HERO BANNER
   ============================================ */
.hero {
  background: linear-gradient(160deg, #0D47A1 0%, #1565C0 35%, #1976D2 65%, #1E88E5 100%);
  min-height: 580px;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -60%;
  right: -20%;
  width: 800px;
  height: 800px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 70%);
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -30%;
  left: -15%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,0.03) 0%, transparent 70%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 28px;
  color: #fff;
}

.hero-content h1 {
  font-size: 48px;
  font-weight: 800;
  letter-spacing: 3px;
  margin-bottom: 20px;
  line-height: 1.2;
  text-shadow: 0 2px 20px rgba(0,0,0,0.15);
}

.hero-content .hero-subtitle {
  font-size: 21px;
  font-weight: 400;
  opacity: 0.92;
  margin-bottom: 40px;
  letter-spacing: 1px;
}

.hero-features {
  display: flex;
  gap: 36px;
  flex-wrap: wrap;
}

.hero-feature {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 400;
  opacity: 0.88;
}

.hero-feature .feature-dot {
  width: 8px;
  height: 8px;
  background: #64B5F6;
  border-radius: 50%;
  box-shadow: 0 0 8px rgba(100,181,246,0.5);
}

/* ============================================
   CARDS
   ============================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
}

.card {
  background: var(--color-bg-white);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  box-shadow: var(--shadow-card);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid rgba(0,0,0,0.04);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
  border-color: var(--color-border);
}

.card-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, #E3F2FD, #BBDEFB);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: var(--color-primary);
}

.card h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-text);
}

.card p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.75;
}

/* Product Cards */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
}

.product-card {
  background: var(--color-bg-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid rgba(0,0,0,0.04);
  display: block;
  text-decoration: none;
  color: inherit;
}

.product-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
  border-color: var(--color-primary-light);
}

.product-card .product-img {
  height: 200px;
  background: linear-gradient(135deg, #E8F0FE, #D6E4F0);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  opacity: 0.7;
}

.product-card .product-info {
  padding: 22px 24px;
}

.product-card .product-info h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text);
}

.product-card .product-info p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Certificate Cards */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.cert-card {
  background: var(--color-bg-white);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow-card);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid rgba(0,0,0,0.04);
}

.cert-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.cert-card .cert-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 18px;
  background: linear-gradient(135deg, #E3F2FD, #BBDEFB);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.cert-card h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--color-text);
}

.cert-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Application Cards */
.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
}

.app-card {
  text-align: center;
  padding: 40px 24px;
  background: var(--color-bg-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid rgba(0,0,0,0.04);
}

.app-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: var(--color-primary-light);
}

.app-card .app-icon {
  width: 76px;
  height: 76px;
  margin: 0 auto 18px;
  background: linear-gradient(135deg, #E3F2FD, #BBDEFB);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.app-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text);
}

.app-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-block;
  padding: 15px 40px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  cursor: pointer;
  letter-spacing: 0.5px;
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: #fff;
  color: var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-bg-light);
  color: var(--color-primary-dark);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.4);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: #fff;
  color: #fff;
}

.btn-blue {
  background: var(--color-primary);
  color: #fff;
}
.btn-blue:hover {
  background: var(--color-primary-dark);
  color: #fff;
  box-shadow: 0 4px 20px rgba(21,101,192,0.3);
}

/* ============================================
   CTA SECTION
   ============================================ */
.cta-section {
  background: linear-gradient(160deg, #0D47A1 0%, #1565C0 60%, #1E88E5 100%);
  padding: 80px 0;
  text-align: center;
  color: #fff;
}
.cta-section h2 {
  font-size: 30px;
  font-weight: 700;
  margin-bottom: 14px;
}
.cta-section p {
  font-size: 17px;
  opacity: 0.90;
  margin-bottom: 32px;
}

/* Contact cards inside CTA — always visible */
.cta-section .contact-card {
  color: #ffffff;
}
.cta-section .contact-card h4 {
  color: #ffffff;
  font-weight: 700;
  font-size: 15px;
}
.cta-section .contact-card p {
  color: rgba(255,255,255,0.92);
  font-size: 15px;
  font-weight: 500;
  opacity: 1;
}

/* ============================================
   FEATURE BAR
   ============================================ */
.feature-bar {
  background: var(--color-bg-white);
  padding: 36px 0;
  box-shadow: var(--shadow-xs);
}
.feature-bar-inner {
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 28px;
}
.feature-bar-item {
  display: flex;
  align-items: center;
  gap: 14px;
}
.fb-text h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text);
}
.fb-text p {
  font-size: 13px;
  color: var(--color-text-secondary);
}

/* ============================================
   HIGHLIGHT BOX
   ============================================ */
.highlight-box {
  background: var(--color-bg-light);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 32px 36px;
  margin: 28px 0;
}
.highlight-box h3 {
  font-size: 18px;
  color: var(--color-primary-dark);
  margin-bottom: 14px;
  font-weight: 700;
}
.highlight-box p {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.9;
}

/* ============================================
   ABOUT PAGE
   ============================================ */
.about-intro {
  font-size: 16px;
  line-height: 2.1;
  color: var(--color-text);
}
.about-intro p {
  margin-bottom: 22px;
}
.about-sidebar {
  background: var(--color-bg-light);
  border-radius: var(--radius-lg);
  padding: 36px;
  border: 1px solid var(--color-border);
}
.about-sidebar h4 {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--color-primary);
}
.about-sidebar ul li {
  padding: 10px 0;
  font-size: 14px;
  color: var(--color-text-secondary);
  border-bottom: 1px solid rgba(0,0,0,0.05);
}
.about-sidebar ul li:last-child { border-bottom: none; }
.about-sidebar ul li::before {
  content: "▸ ";
  color: var(--color-primary);
  font-weight: bold;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 56px;
  align-items: start;
}

/* ============================================
   TAB SYSTEM (Products)
   ============================================ */
.tabs {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 44px;
  flex-wrap: wrap;
}
.tab-btn {
  padding: 11px 26px;
  font-size: 15px;
  font-weight: 600;
  border: 2px solid var(--color-border);
  background: var(--color-bg-white);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}
.tab-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.tab-btn.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ============================================
   PAGE BANNER & BREADCRUMB
   ============================================ */
.page-banner {
  margin-top: calc(var(--header-height) + 44px);
  padding: 72px 0;
  text-align: center;
  background: linear-gradient(160deg, #0D47A1, #1565C0);
  color: #fff;
}
.page-banner h1 {
  font-size: 38px;
  font-weight: 800;
  margin-bottom: 10px;
  letter-spacing: 2px;
}
.page-banner p {
  font-size: 17px;
  opacity: 0.88;
  font-weight: 400;
}

.breadcrumb {
  background: var(--color-bg-white);
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
  color: var(--color-text-secondary);
}
.breadcrumb a { color: var(--color-text-secondary); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb span { margin: 0 8px; }

/* ============================================
   CONTACT INFO
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
}
.contact-card {
  background: var(--color-bg-white);
  padding: 36px 28px;
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-card);
  border: 1px solid rgba(0,0,0,0.04);
}
.contact-card .contact-icon {
  font-size: 32px;
  color: var(--color-primary);
  margin-bottom: 16px;
}
.contact-card h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text);
}
.contact-card p {
  font-size: 15px;
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* ============================================
   SPEC TABLE
   ============================================ */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-bg-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}
.spec-table thead { background: var(--color-primary); color: #fff; }
.spec-table th,
.spec-table td {
  padding: 15px 22px;
  text-align: left;
  font-size: 15px;
}
.spec-table th { font-weight: 700; }
.spec-table tbody tr:nth-child(even) { background: var(--color-bg-light); }
.spec-table tbody tr:hover { background: #D6E4F0; }

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--color-footer);
  color: rgba(255,255,255,0.75);
  padding: 60px 0 28px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 48px;
  margin-bottom: 40px;
}
.footer-col h4 {
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}
.footer-col p,
.footer-col a {
  font-size: 14px;
  color: rgba(255,255,255,0.65);
  line-height: 2.2;
}
.footer-col a { display: block; }
.footer-col a:hover { color: #64B5F6; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
  color: rgba(255,255,255,0.35);
}

/* ============================================
   UTILITIES
   ============================================ */
.text-center { text-align: center; }
.mt-20 { margin-top: 20px; }
.mt-40 { margin-top: 40px; }
.mb-20 { margin-bottom: 20px; }
.bg-light { background: var(--color-bg-light); }
.bg-white { background: var(--color-bg-white); }

/* ============================================
   SCROLL ANIMATION
   ============================================ */
.fade-up {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   BACK TO TOP
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: 36px;
  right: 36px;
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 22px;
  font-weight: bold;
  box-shadow: 0 4px 16px rgba(21,101,192,0.3);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}
.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(13,71,161,0.4);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  .two-col { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  :root { --header-height: 60px; }

  .container { padding: 0 18px; }

  .section { padding: 60px 0; }
  .section-header { margin-bottom: 40px; }
  .section-header h2 { font-size: 28px; }

  /* Mobile Nav */
  .menu-toggle { display: flex; }

  .nav-list {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: var(--color-bg-white);
    flex-direction: column;
    gap: 0;
    box-shadow: var(--shadow-md);
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
    z-index: 999;
    border-top: 1px solid var(--color-border);
  }
  .nav-list.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  .nav-list a {
    padding: 15px 24px;
    display: block;
    border-bottom: 1px solid rgba(0,0,0,0.04);
    font-size: 16px;
  }
  .nav-list a::after { display: none; }

  /* Hero — natural flow on mobile */
  .hero { min-height: 440px; margin-top: 0; }
  .hero-content h1 { font-size: 32px; letter-spacing: 2px; }
  .hero-content .hero-subtitle { font-size: 17px; }
  .hero-features { gap: 18px; }

  .page-banner { padding: 48px 0; margin-top: 0; }
  .page-banner h1 { font-size: 28px; }

  /* Header flows naturally below top-bar on mobile */
  .header {
    position: relative;
    top: 0;
    box-shadow: var(--shadow-sm);
  }

  /* Footer */
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }

  .card-grid,
  .product-grid,
  .app-grid,
  .cert-grid { grid-template-columns: 1fr; }

  .feature-bar-inner {
    flex-direction: column;
    align-items: flex-start;
    padding: 0 18px;
  }

  .back-to-top { bottom: 24px; right: 24px; width: 42px; height: 42px; }

  .logo-img { height: 34px; }
}

@media (max-width: 480px) {
  .hero { min-height: 360px; }
  .hero-content h1 { font-size: 26px; }
  .hero-content .hero-subtitle { font-size: 15px; }
  .hero-feature { font-size: 13px; }
}