:root {
    --primary: #185FA5;
    --primary-dark: #0C447C;
    --primary-light: #378ADD;
    --primary-lighter: #B5D4F4;
    --primary-lightest: #E6F1FB;
    --accent: #00D4FF;
    --dark: #0A1929;
    --dark-2: #112D4E;
    --gray-50: #F8FAFC;
    --gray-100: #F1F5F9;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-400: #94A3B8;
    --gray-500: #64748B;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1E293B;
    --gray-900: #0F172A;
    --white: #FFFFFF;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
    --shadow-blue: 0 8px 32px rgba(24,95,165,0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--white);
    overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

.text-gradient {
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(255,255,255,0.95);
    border-bottom-color: var(--gray-200);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 84px;
}

.logo {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 58px;
    width: auto;
    display: block;
    transition: var(--transition);
}

.logo:hover .logo-img { opacity: 0.85; }

.nav-menu { flex: 1; display: flex; justify-content: center; }

.nav-list { display: flex; gap: 4px; }

.nav-link {
    padding: 10px 18px;
    font-size: 16px;
    color: var(--gray-600);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    position: relative;
}

.nav-link:hover { color: var(--primary); background: var(--primary-lightest); }

.nav-link.active { color: var(--primary); font-weight: 500; }

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
}

.nav-actions { display: flex; align-items: center; gap: 12px; }

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle span {
    width: 22px;
    height: 2px;
    background: var(--gray-700);
    border-radius: 2px;
    transition: var(--transition);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
    box-shadow: var(--shadow-blue);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 12px 36px rgba(24,95,165,0.25);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary-lighter);
}

.btn-outline:hover {
    border-color: var(--primary);
    background: var(--primary-lightest);
}

.btn-sm { padding: 8px 20px; font-size: 14px; }
.btn-block { width: 100%; }

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: linear-gradient(180deg, var(--primary-lightest) 0%, var(--white) 100%);
    padding-top: 84px;
}

.hero-bg { position: absolute; inset: 0; overflow: hidden; }

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--primary-lighter) 1px, transparent 1px),
        linear-gradient(90deg, var(--primary-lighter) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: 0.3;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.15;
}

.orb-1 { width: 500px; height: 500px; background: var(--primary-light); top: -100px; right: -100px; }
.orb-2 { width: 400px; height: 400px; background: var(--accent); bottom: -50px; left: -50px; }

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: var(--white);
    border: 1px solid var(--primary-lighter);
    border-radius: 999px;
    font-size: 13px;
    color: var(--primary-dark);
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background: #22C55E;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(34,197,94,0.4); }
    50% { box-shadow: 0 0 0 6px rgba(34,197,94,0); }
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    color: var(--dark);
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.hero-desc {
    font-size: 17px;
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: 36px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 64px;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
}

.stat-item { text-align: center; }

.stat-number {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 4px;
}

.stat-label { font-size: 13px; color: var(--gray-500); }

.stat-divider { width: 1px; height: 40px; background: var(--gray-200); }

.hero-scroll {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    font-size: 12px;
    color: var(--gray-400);
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--gray-300), transparent);
    margin: 8px auto 0;
    animation: scrollLine 2s infinite;
}

@keyframes scrollLine {
    0% { transform: scaleY(0); transform-origin: top; }
    50% { transform: scaleY(1); transform-origin: top; }
    51% { transform-origin: bottom; }
    100% { transform: scaleY(0); transform-origin: bottom; }
}

.section { padding: 100px 0; }

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    font-size: 12px;
    letter-spacing: 2px;
    color: var(--primary);
    background: var(--primary-lightest);
    padding: 4px 12px;
    border-radius: 999px;
    margin-bottom: 12px;
    font-weight: 600;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
}

.section-subtitle { font-size: 16px; color: var(--gray-500); }

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 80px;
}

.about-heading {
    font-size: 24px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 16px;
}

.about-text {
    font-size: 15px;
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: 16px;
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 28px;
}

.feature-item {
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.feature-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-lightest);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    flex-shrink: 0;
}

.feature-icon svg { width: 22px; height: 22px; }

.feature-text h4 { font-size: 15px; font-weight: 600; color: var(--dark); margin-bottom: 2px; }
.feature-text p { font-size: 13px; color: var(--gray-500); }

.about-visual {
    position: relative;
    height: 400px;
}

.visual-card {
    position: absolute;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.visual-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }

.card-1 { top: 0; left: 0; width: 260px; }
.card-2 { top: 120px; right: 0; width: 240px; }
.card-3 { bottom: 0; left: 40px; width: 260px; }

.card-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-lightest);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    flex-shrink: 0;
}

.card-icon svg { width: 28px; height: 28px; }

.card-info h4 { font-size: 15px; font-weight: 600; color: var(--dark); margin-bottom: 2px; }
.card-info p { font-size: 13px; color: var(--gray-500); }

.visual-glow {
    position: absolute;
    width: 300px;
    height: 300px;
    background: var(--primary-light);
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.1;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: -1;
}

.timeline {
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    padding: 48px;
}

.timeline-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--dark);
    text-align: center;
    margin-bottom: 40px;
}

.timeline-track {
    display: flex;
    justify-content: space-between;
    position: relative;
}

.timeline-track::before {
    content: '';
    position: absolute;
    top: 6px;
    left: 5%;
    right: 5%;
    height: 2px;
    background: var(--gray-200);
}

.timeline-item {
    text-align: center;
    position: relative;
    z-index: 1;
    flex: 1;
}

.timeline-dot {
    width: 14px;
    height: 14px;
    background: var(--white);
    border: 3px solid var(--primary);
    border-radius: 50%;
    margin: 0 auto 12px;
    transition: var(--transition);
}

.timeline-item:hover .timeline-dot {
    background: var(--primary);
    transform: scale(1.2);
}

.timeline-year { font-size: 18px; font-weight: 700; color: var(--primary); margin-bottom: 6px; }
.timeline-text { font-size: 13px; color: var(--gray-500); max-width: 140px; margin: 0 auto; }

.products { background: var(--gray-50); }

/* ===== Product Catalog - Sidebar + Content ===== */
.product-catalog {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 32px;
    margin-top: 40px;
    align-items: start;
}

.catalog-sidebar {
    display: flex;
    flex-direction: column;
    gap: 6px;
    position: sticky;
    top: 100px;
}

.catalog-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    color: var(--gray-600);
    font-size: 15px;
    font-weight: 500;
    border: 1px solid transparent;
    background: var(--white);
}

.catalog-item:hover {
    background: var(--primary-lightest);
    color: var(--primary);
    border-color: var(--primary-lighter);
}

.catalog-item.active {
    background: var(--primary);
    color: var(--white);
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.25);
}

.catalog-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    background: var(--primary-lightest);
    color: var(--primary);
    flex-shrink: 0;
    transition: var(--transition);
}

.catalog-icon svg { width: 22px; height: 22px; }

.catalog-item.active .catalog-icon {
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
}

.catalog-name {
    flex: 1;
    line-height: 1.3;
}

.catalog-count {
    font-size: 12px;
    padding: 2px 10px;
    border-radius: 999px;
    background: var(--gray-100);
    color: var(--gray-500);
    flex-shrink: 0;
    font-weight: 600;
}

.catalog-item.active .catalog-count {
    background: rgba(255, 255, 255, 0.25);
    color: var(--white);
}

/* ====== Sidebar dropdown submenu ====== */
.catalog-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.catalog-item.has-children {
    position: relative;
    user-select: none;
}

.catalog-arrow {
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: currentColor;
    opacity: 0.6;
    transition: transform 0.25s ease, opacity 0.25s ease;
    flex-shrink: 0;
}

.catalog-arrow svg {
    width: 12px;
    height: 12px;
}

.catalog-item.has-children.expanded .catalog-arrow {
    transform: rotate(180deg);
    opacity: 1;
}

.catalog-submenu {
    display: flex;
    flex-direction: column;
    gap: 2px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease, margin 0.3s ease;
    padding: 0 0 0 16px;
    margin: 0;
    border-left: 2px solid var(--gray-100);
    margin-left: 26px;
}

.catalog-submenu.open {
    max-height: 600px;
    padding: 6px 0 6px 12px;
    margin-top: 4px;
    margin-bottom: 6px;
    border-left-color: var(--primary-lightest);
}

.catalog-item.active ~ .catalog-submenu.open,
.catalog-group:has(.catalog-item.active) .catalog-submenu {
    border-left-color: var(--primary);
}

.catalog-subitem {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 9px 12px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--gray-600);
    text-decoration: none;
    transition: var(--transition);
    line-height: 1.3;
    position: relative;
}

.subitem-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--gray-300);
    flex-shrink: 0;
    transition: var(--transition);
}

.subitem-count {
    margin-left: auto;
    font-size: 12px;
    color: var(--gray-400);
    font-weight: 600;
    background: var(--gray-100);
    padding: 1px 8px;
    border-radius: 999px;
}

.catalog-subitem:hover {
    background: var(--primary-lightest);
    color: var(--primary);
}

.catalog-subitem:hover .subitem-dot {
    background: var(--primary);
    transform: scale(1.3);
}

.catalog-subitem.active {
    background: var(--primary);
    color: var(--white);
    font-weight: 600;
}

.catalog-subitem.active .subitem-dot {
    background: var(--white);
}

.catalog-subitem.active .subitem-count {
    background: rgba(255, 255, 255, 0.25);
    color: var(--white);
}

.catalog-content {
    min-height: 400px;
}

.catalog-panel {
    display: none;
}

.catalog-panel.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

.catalog-panel-header {
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--gray-100);
}

.catalog-panel-header h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 6px;
}

.catalog-panel-header p {
    font-size: 14px;
    color: var(--gray-500);
}

/* ===== Subcatalog Tabs (Level 2 under Sensor) ===== */
.subcatalog-tabs {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
    border-bottom: 2px solid var(--gray-100);
    padding-bottom: 2px;
}

.subcatalog-tab {
    padding: 10px 22px;
    font-size: 15px;
    font-weight: 500;
    color: var(--gray-600);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: -2px;
}

.subcatalog-tab:hover {
    color: var(--primary);
}

.subcatalog-tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    font-weight: 600;
}

.subcatalog-panel {
    display: none;
}

.subcatalog-panel.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

/* Product card as link */
.product-card {
    text-decoration: none;
    display: block;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.product-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
}

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

.product-card.hidden { display: none; }

.product-icon {
    height: 180px;
    background: linear-gradient(135deg, var(--primary-lightest), var(--gray-50));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
}

.product-icon svg { width: 80px; height: 80px; }

.product-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 20px;
    filter: drop-shadow(0 8px 24px rgba(0,0,0,0.08));
}

.product-body { padding: 24px; }

.product-tag {
    display: inline-block;
    font-size: 12px;
    color: var(--primary);
    background: var(--primary-lightest);
    padding: 2px 10px;
    border-radius: 999px;
    margin-bottom: 10px;
}

.product-name { font-size: 18px; font-weight: 600; color: var(--dark); margin-bottom: 8px; }

.product-desc { font-size: 14px; color: var(--gray-500); line-height: 1.6; margin-bottom: 16px; }

.product-specs { display: flex; flex-direction: column; gap: 6px; }

.product-specs li {
    font-size: 13px;
    color: var(--gray-600);
    padding-left: 16px;
    position: relative;
}

.product-specs li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 6px;
    height: 6px;
    background: var(--primary-light);
    border-radius: 50%;
}

.product-coming-soon {
    display: inline-block;
    font-size: 13px;
    color: var(--gray-400);
    background: var(--gray-50);
    border: 1px dashed var(--gray-300);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    margin-top: 4px;
}

.product-card.placeholder .product-icon svg {
    width: 72px;
    height: 72px;
    opacity: 0.6;
}

/* ===== Catalog More (link to independent page) ===== */
.catalog-more {
    margin-top: 32px;
    padding: 28px;
    background: var(--primary-lightest);
    border-radius: var(--radius-lg);
    text-align: center;
}

.catalog-more p {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: 20px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== DYTRAN sub-section within sensor panel ===== */
.subcatalog-section {
    margin-top: 48px;
    padding-top: 8px;
}

.subcatalog-divider {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.subcatalog-divider::before,
.subcatalog-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--gray-200);
}

.subcatalog-divider span {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-dark);
    white-space: nowrap;
}

.subcatalog-intro {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.8;
    margin-bottom: 24px;
    padding: 0 4px;
}

.btn-catalog {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 32px;
    font-size: 15px;
}

/* ===== Inner Page Banner ===== */
.page-banner {
    padding: 140px 0 60px;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: var(--white);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-banner::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: 40px 40px;
}

.page-banner-content { position: relative; z-index: 1; }

.page-banner h1 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 12px;
}

.page-banner p {
    font-size: 16px;
    opacity: 0.85;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 16px 0;
    font-size: 14px;
    color: var(--gray-500);
}

.breadcrumb a { color: var(--gray-600); transition: var(--transition); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { color: var(--gray-400); }

.page-content { padding: 40px 0 80px; }

/* ===== Homepage Business Section Cards ===== */
.business-section {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 40px;
}

.business-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
}

.business-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-lighter);
}

.business-card-icon {
    width: 56px;
    height: 56px;
    background: var(--primary-lightest);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    margin-bottom: 20px;
}

.business-card-icon svg { width: 32px; height: 32px; }

.business-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 8px;
}

.business-card-desc {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.6;
    margin-bottom: 20px;
    flex: 1;
}

.business-card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.business-card-count { font-size: 13px; color: var(--gray-400); }
.business-card-link { font-size: 14px; color: var(--primary); font-weight: 500; }
.business-card:hover .business-card-link { color: var(--primary-dark); }

@media (max-width: 1024px) {
    .business-section { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .business-section { grid-template-columns: 1fr; }
    .page-banner h1 { font-size: 28px; }
}

/* ===== Category Overview Cards (Homepage) ===== */
.category-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 40px;
}

.category-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-lighter);
}

.category-card-icon {
    width: 56px;
    height: 56px;
    background: var(--primary-lightest);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    margin-bottom: 20px;
}

.category-card-icon svg { width: 32px; height: 32px; }

.category-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 8px;
}

.category-card-desc {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.6;
    margin-bottom: 20px;
    flex: 1;
}

.category-card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.category-card-count {
    font-size: 13px;
    color: var(--gray-400);
}

.category-card-link {
    font-size: 14px;
    color: var(--primary);
    font-weight: 500;
}

.category-card:hover .category-card-link {
    color: var(--primary-dark);
}

@media (max-width: 1024px) {
    .category-cards { grid-template-columns: repeat(2, 1fr); }
}

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

.tech-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 20px;
    margin-bottom: 60px;
}

.tech-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: var(--transition);
}

.tech-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

.tech-card-large {
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: var(--white);
    border: none;
}

.tech-card-bg {
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 80% 20%, rgba(255,255,255,0.1) 0%, transparent 50%);
}

.tech-card-content { position: relative; z-index: 1; }

.tech-icon-lg {
    width: 64px;
    height: 64px;
    color: var(--white);
    opacity: 0.9;
    margin-bottom: 20px;
}

.tech-icon-lg svg { width: 100%; height: 100%; }

.tech-card-large h3 { font-size: 22px; font-weight: 600; margin-bottom: 12px; }
.tech-card-large p { font-size: 14px; opacity: 0.85; line-height: 1.7; margin-bottom: 20px; }

.tech-tags { display: flex; flex-wrap: wrap; gap: 8px; }

.tech-tags span {
    font-size: 12px;
    padding: 4px 12px;
    background: rgba(255,255,255,0.15);
    border-radius: 999px;
}

.tech-icon {
    width: 44px;
    height: 44px;
    background: var(--primary-lightest);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    margin-bottom: 16px;
}

.tech-icon svg { width: 26px; height: 26px; }

.tech-card h4 { font-size: 16px; font-weight: 600; color: var(--dark); margin-bottom: 8px; }
.tech-card p { font-size: 13px; color: var(--gray-500); line-height: 1.6; }

.applications { margin-top: 40px; }

.apps-title { font-size: 22px; font-weight: 600; color: var(--dark); text-align: center; margin-bottom: 32px; }

.apps-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 16px;
}

.app-item {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: 24px 16px;
    text-align: center;
    transition: var(--transition);
}

.app-item:hover {
    border-color: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.app-icon {
    width: 40px;
    height: 40px;
    margin: 0 auto 12px;
    color: var(--primary);
}

.app-icon svg { width: 100%; height: 100%; }

.app-item span { font-size: 14px; color: var(--gray-700); font-weight: 500; }

.news { background: var(--gray-50); }

.news-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 24px;
}

.news-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
}

.news-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

.news-featured { grid-row: span 2; }

.news-image {
    height: 200px;
    position: relative;
    overflow: hidden;
}

.news-img-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
}

.news-badge {
    position: absolute;
    top: 16px;
    left: 16px;
    background: rgba(255,255,255,0.9);
    color: var(--primary);
    font-size: 12px;
    padding: 4px 12px;
    border-radius: 999px;
    font-weight: 500;
}

.news-body { padding: 24px; }

.news-tag {
    display: inline-block;
    font-size: 12px;
    color: var(--primary);
    background: var(--primary-lightest);
    padding: 2px 10px;
    border-radius: 999px;
    margin-bottom: 10px;
}

.news-date { font-size: 13px; color: var(--gray-400); margin-bottom: 8px; }
.news-title { font-size: 16px; font-weight: 600; color: var(--dark); margin-bottom: 8px; line-height: 1.5; }
.news-featured .news-title { font-size: 20px; }
.news-excerpt { font-size: 14px; color: var(--gray-500); line-height: 1.6; margin-bottom: 12px; }

.news-link { font-size: 14px; color: var(--primary); font-weight: 500; }
.news-link:hover { text-decoration: underline; }

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
    align-items: start;
}

.contact-info { display: flex; flex-direction: column; gap: 24px; }

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-lightest);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    flex-shrink: 0;
}

.contact-icon svg { width: 24px; height: 24px; }

.contact-text h4 { font-size: 15px; font-weight: 600; color: var(--dark); margin-bottom: 4px; }
.contact-text p { font-size: 14px; color: var(--gray-600); }

.contact-form-wrap {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 36px;
    box-shadow: var(--shadow-sm);
}

.form-title { font-size: 20px; font-weight: 600; color: var(--dark); margin-bottom: 24px; }

.form-group { margin-bottom: 16px; }

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: var(--font-sans);
    color: var(--gray-800);
    background: var(--gray-50);
    transition: var(--transition);
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--white);
    box-shadow: 0 0 0 3px rgba(24,95,165,0.1);
}

.form-success {
    display: none;
    margin-top: 16px;
    padding: 12px 16px;
    background: #ECFDF5;
    color: #059669;
    border-radius: var(--radius-sm);
    font-size: 14px;
}

.form-success.show { display: block; }

.footer {
    background: var(--dark);
    color: var(--gray-400);
    padding: 60px 0 24px;
}

.footer-top {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand .logo { margin-bottom: 16px; }
.footer-brand .logo-img { height: 44px; }

.footer-desc {
    font-size: 14px;
    line-height: 1.7;
    max-width: 360px;
}

.footer-links {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 32px;
}

.footer-col h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 16px;
}

.footer-col a,
.footer-col p {
    display: block;
    font-size: 13px;
    color: var(--gray-400);
    margin-bottom: 8px;
    transition: var(--transition);
}

.footer-col a:hover { color: var(--primary-light); }

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 24px;
    text-align: center;
}

.footer-bottom p { font-size: 13px; color: var(--gray-500); }

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 1024px) {
    .hero-title { font-size: 42px; }
    .about-grid { grid-template-columns: 1fr; gap: 40px; }
    .about-visual { height: 350px; max-width: 500px; margin: 0 auto; }
    .product-grid { grid-template-columns: repeat(2, 1fr); }
    .tech-grid { grid-template-columns: 1fr 1fr; }
    .tech-card-large { grid-column: span 2; }
    .apps-grid { grid-template-columns: repeat(3, 1fr); }
    .news-grid { grid-template-columns: 1fr 1fr; }
    .news-featured { grid-row: auto; grid-column: span 2; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-top { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 768px) {
    .nav-menu { display: none; }
    .menu-toggle { display: flex; }
    .nav-menu.open {
        display: flex;
        position: absolute;
        top: 84px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--gray-200);
        box-shadow: var(--shadow-md);
    }
    .nav-menu.open .nav-list { flex-direction: column; width: 100%; }
    .nav-menu.open .nav-link { padding: 12px 16px; }
    .logo-img { height: 46px; }
    .footer-brand .logo-img { height: 50px; }

    .hero-title { font-size: 32px; }
    .hero-desc { font-size: 15px; }
    .hero-stats { flex-wrap: wrap; gap: 16px; }
    .stat-divider { display: none; }
    .stat-number { font-size: 28px; }

    .section { padding: 60px 0; }
    .section-title { font-size: 28px; }

    .about-features { grid-template-columns: 1fr; }
    .timeline { padding: 32px 20px; }
    .timeline-track { flex-direction: column; gap: 24px; }
    .timeline-track::before { display: none; }
    .timeline-item { display: flex; align-items: center; gap: 16px; text-align: left; }
    .timeline-dot { margin: 0; }
    .timeline-text { max-width: none; }

    .product-grid { grid-template-columns: 1fr; }
    .tech-grid { grid-template-columns: 1fr; }
    .tech-card-large { grid-column: span 1; }
    .apps-grid { grid-template-columns: repeat(2, 1fr); }
    .news-grid { grid-template-columns: 1fr; }
    .news-featured { grid-column: span 1; }
    .footer-links { grid-template-columns: 1fr; gap: 24px; }

    .hero-actions { flex-direction: column; align-items: center; }
    .hero-actions .btn { width: 100%; max-width: 280px; }

    .product-catalog { grid-template-columns: 1fr; gap: 16px; }
    .catalog-sidebar {
        flex-direction: row;
        overflow-x: auto;
        gap: 8px;
        position: static;
        padding-bottom: 4px;
        -webkit-overflow-scrolling: touch;
    }
    .catalog-item {
        white-space: nowrap;
        padding: 10px 14px;
        flex-shrink: 0;
        font-size: 13px;
    }
    .catalog-icon { width: 28px; height: 28px; }
    .catalog-icon svg { width: 18px; height: 18px; }
    .catalog-count { display: none; }
    .catalog-panel-header h3 { font-size: 18px; }
    .catalog-arrow { display: none; }
    .catalog-group { min-width: 180px; }
    .catalog-submenu { display: none; }
    .catalog-submenu.open { display: flex; max-height: none; }
}


/* ===== DYTRAN Product Thumbnail ===== */
.dytran-product-thumb {
    width: 64px;
    height: 64px;
    flex-shrink: 0;
    border-radius: 8px;
    overflow: hidden;
    background: #f5f7fa;
    border: 1px solid #e8ecf0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.dytran-product-thumb img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 4px;
    transition: transform 0.3s ease;
}

.dytran-product-header:hover .dytran-product-thumb img {
    transform: scale(1.1);
}

/* Adjust product header layout to accommodate thumbnail */
.dytran-product-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 20px;
    cursor: pointer;
    transition: background 0.2s;
}

.dytran-product-info {
    flex-shrink: 0;
    min-width: 200px;
}

.dytran-product-summary {
    flex: 1;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}

@media (max-width: 768px) {
    .dytran-product-thumb {
        width: 48px;
        height: 48px;
    }
    .dytran-product-header {
        flex-wrap: wrap;
        gap: 10px;
        padding: 12px 14px;
    }
    .dytran-product-info {
        min-width: 0;
        flex: 1;
    }
    .dytran-product-summary {
        width: 100%;
    }
}

/* === 移动端浮动联系方式 === */
.mobile-contact-bar {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 9999;
    background: #fff;
    box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.12);
    padding: 8px 12px;
    gap: 10px;
    align-items: center;
}
.mobile-contact-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px 8px;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 700;
    text-decoration: none;
    transition: transform 0.15s, opacity 0.15s;
}
.mobile-contact-btn:active {
    transform: scale(0.96);
    opacity: 0.85;
}
.phone-btn {
    background: linear-gradient(135deg, #0f3460, #1a5276);
    color: #fff;
}
.email-btn {
    background: #f0f2f5;
    color: #0f3460;
    border: 1.5px solid #d0d5dd;
}

@media (max-width: 768px) {
    .mobile-contact-bar {
        display: flex;
    }
    body {
        padding-bottom: 64px;
    }
}