/* ============================================================
   苏州壹伏安科技有限公司 - 官网样式
   主色调：科技蓝 #0052CC → #0088FF
   点缀色：橙色 #FF6B35
   ============================================================ */

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

:root {
    --primary: #0052CC;
    --primary-light: #0088FF;
    --primary-dark: #003D99;
    --primary-bg: #E8F4FD;
    --accent: #FF6B35;
    --accent-light: #FF8F66;
    --success: #00C853;
    --warning: #FFA000;
    --purple: #7C3AED;
    --text: #1A1A2E;
    --text-secondary: #555770;
    --text-muted: #8E90A6;
    --bg-light: #F8FAFC;
    --bg-white: #FFFFFF;
    --border: #E4E7ED;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.16);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    --font-en: "Inter", "Segoe UI", system-ui, sans-serif;
    --max-width: 1280px;
    --header-height: 72px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    color: var(--text);
    background: var(--bg-white);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* ==================== Header / Navigation ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.header.scrolled {
    border-bottom-color: var(--border);
    box-shadow: var(--shadow-sm);
}

.header-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
}

.logo-icon svg,
.logo-icon img {
    display: block;
    height: 40px;
    width: auto;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-name {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1.2;
    letter-spacing: 1px;
}

.logo-sub {
    font-size: 0.6rem;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 2px;
    font-family: var(--font-en);
}

/* Navigation */
.nav {
    display: flex;
    align-items: center;
}

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

.nav-item {
    position: relative;
}

.nav-item > a {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 8px 14px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    white-space: nowrap;
}

.nav-item > a i {
    font-size: 0.6rem;
    transition: transform 0.3s ease;
}

.nav-item:hover > a,
.nav-item.active > a {
    color: var(--primary);
    background: var(--primary-bg);
}

.nav-item:hover > a i {
    transform: rotate(180deg);
}

/* Dropdown */
.dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%) translateY(8px);
    background: var(--bg-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 24px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    pointer-events: none;
    min-width: 520px;
    border: 1px solid var(--border);
}

.nav-item.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
}

.dropdown-grid {
    display: flex;
    gap: 32px;
}

.dropdown-col h4 {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
    font-weight: 600;
}

.dropdown-col a {
    display: block;
    padding: 6px 0;
    font-size: 0.88rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.dropdown-col a:hover {
    color: var(--primary);
    padding-left: 4px;
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.lang-switch {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    font-family: var(--font-en);
}

.lang-btn {
    background: none;
    border: none;
    padding: 4px 6px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    font-family: var(--font-en);
}

.lang-btn:hover {
    color: var(--primary);
    background: var(--primary-bg);
}

.lang-btn.active {
    color: var(--primary);
    font-weight: 700;
    background: var(--primary-bg);
}

.lang-divider {
    margin: 0 2px;
    color: var(--border);
}

.btn-search {
    background: none;
    border: none;
    font-size: 1.1rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 6px;
    border-radius: 50%;
    transition: var(--transition);
}

.btn-search:hover {
    color: var(--primary);
    background: var(--primary-bg);
}

.btn-nav-contact {
    padding: 8px 18px !important;
    background: var(--accent) !important;
    color: white !important;
    border-radius: var(--radius-sm) !important;
    font-weight: 600 !important;
    transition: var(--transition) !important;
}

.btn-nav-contact:hover {
    background: var(--accent-light) !important;
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.3);
}

/* Mobile Menu Button */
.btn-menu-mobile {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.btn-menu-mobile span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: var(--transition);
}

/* ==================== Hero Section ==================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #001840 0%, #003D99 30%, #0052CC 60%, #0066E0 100%);
    overflow: hidden;
    padding-top: var(--header-height);
}

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

.hero-particles {
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(0, 136, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.03) 0%, transparent 70%);
}

.hero-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 80px 24px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 600px;
}

.hero-tagline {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.7);
    background: rgba(255, 255, 255, 0.1);
    padding: 6px 16px;
    border-radius: 20px;
    margin-bottom: 24px;
    letter-spacing: 1px;
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    color: #ffffff;
    line-height: 1.25;
    margin-bottom: 24px;
    letter-spacing: -0.5px;
}

.hero-highlight {
    background: linear-gradient(90deg, #4DB8FF, #0088FF);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.75);
    line-height: 1.8;
    margin-bottom: 36px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.btn-primary:hover {
    background: var(--accent-light);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(255, 107, 53, 0.35);
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    background: transparent;
    color: white;
    border: 1.5px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-outline:hover {
    border-color: white;
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.btn-outline-white {
    border-color: rgba(255, 255, 255, 0.5);
    color: white;
}

.btn-outline-white:hover {
    border-color: white;
    background: rgba(255, 255, 255, 0.15);
}

.btn-lg {
    padding: 14px 36px;
    font-size: 1rem;
}

/* Hero Stats */
.hero-stats {
    display: flex;
    gap: 32px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-num {
    font-size: 1.5rem;
    font-weight: 800;
    color: white;
    line-height: 1;
}

.stat-num small {
    font-size: 0.8rem;
    font-weight: 500;
    margin-left: 2px;
}

.stat-label {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.5);
    font-weight: 500;
}

/* Hero Visual */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-chip-illustration {
    position: relative;
}

.chip-outer {
    position: relative;
    width: 320px;
    height: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chip-inner {
    width: 180px;
    height: 180px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid rgba(255, 255, 255, 0.1);
    z-index: 2;
    position: relative;
}

.chip-svg {
    width: 140px;
    height: 140px;
}

.chip-waves {
    position: absolute;
    inset: 0;
}

.wave {
    position: absolute;
    inset: -20px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.08);
    animation: wavePulse 3s ease-in-out infinite;
}

.wave-2 {
    inset: -50px;
    animation-delay: 1s;
}

.wave-3 {
    inset: -80px;
    animation-delay: 2s;
}

@keyframes wavePulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.5;
    }
    50% {
        transform: scale(1.05);
        opacity: 1;
    }
}

/* ==================== Section Common ==================== */
.section-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

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

.section-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 2px;
    background: var(--primary-bg);
    padding: 6px 16px;
    border-radius: 20px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--text);
    line-height: 1.4;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ==================== Features Section ==================== */
.features {
    padding: 100px 0;
    background: var(--bg-white);
}

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

.feature-card {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 36px 28px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    opacity: 0;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: var(--primary-bg);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 1.5rem;
    color: var(--primary);
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    background: var(--primary);
    color: white;
    transform: scale(1.05);
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text);
    line-height: 1.3;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.feature-link {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}

.feature-link i {
    font-size: 0.7rem;
    transition: transform 0.3s ease;
}

.feature-link:hover {
    color: var(--primary-dark);
    gap: 10px;
}

.feature-link:hover i {
    transform: translateX(4px);
}

/* ==================== Products Section ==================== */
.products {
    padding: 100px 0;
    background: var(--bg-light);
}

.product-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 48px;
}

.tab-btn {
    padding: 10px 24px;
    border: 1.5px solid var(--border);
    background: var(--bg-white);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

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

.tab-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

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

.product-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
}

.product-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.product-badge {
    position: absolute;
    top: 16px;
    left: 16px;
    background: var(--success);
    color: white;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 4px;
    z-index: 2;
    letter-spacing: 0.5px;
}

.product-badge.badge-new {
    background: var(--purple);
}

.product-img {
    height: 200px;
    background: var(--bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.product-illustration {
    width: 180px;
    height: auto;
}

.product-info {
    padding: 24px;
}

.product-series {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
    letter-spacing: 1px;
}

.product-info h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
    line-height: 1.4;
}

.product-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
}

.product-specs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.spec {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--primary);
    background: var(--primary-bg);
    padding: 3px 10px;
    border-radius: 4px;
}

/* ==================== Industries Section ==================== */
.industries {
    padding: 100px 0;
    background: var(--bg-white);
}

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

.industry-card {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
}

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

.industry-img {
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.industry-illustration {
    width: 100%;
    height: 100%;
}

.industry-info {
    padding: 24px;
}

.industry-info h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.industry-info h3 i {
    color: var(--primary);
    font-size: 1rem;
}

.industry-info p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

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

.industry-tags span {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--primary);
    background: var(--primary-bg);
    padding: 3px 10px;
    border-radius: 4px;
}

/* ==================== About Section ==================== */
.about {
    padding: 100px 0;
    background: var(--bg-light);
}

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

.about-text {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

.about-stats-row {
    display: flex;
    gap: 40px;
    margin: 32px 0;
    padding: 24px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.about-stat {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.about-stat-num {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--primary);
}

.about-stat-num small {
    font-size: 0.75rem;
    font-weight: 500;
}

.about-stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.about-certificates {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.cert-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary);
    background: var(--primary-bg);
    padding: 6px 14px;
    border-radius: 20px;
    border: 1px solid rgba(0, 82, 204, 0.15);
}

.about-visual {
    display: flex;
    justify-content: center;
}

.about-img-box {
    width: 100%;
    max-width: 400px;
}

.about-svg {
    width: 100%;
    height: auto;
}

/* ==================== Team Advantages ==================== */
.team-advantages {
    padding: 100px 0;
    background: var(--bg-white);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.advantage-card {
    text-align: center;
    padding: 40px 24px;
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

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

.adv-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    background: var(--primary-bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary);
    transition: var(--transition);
}

.advantage-card:hover .adv-icon {
    background: var(--primary);
    color: white;
    transform: scale(1.05);
}

.advantage-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.advantage-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ==================== CTA Section ==================== */
.cta-section {
    padding: 80px 0;
}

.cta-card {
    background: linear-gradient(135deg, #003D99 0%, #0052CC 50%, #0066E0 100%);
    border-radius: var(--radius-lg);
    padding: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
    position: relative;
    overflow: hidden;
}

.cta-content h2 {
    font-size: 1.8rem;
    font-weight: 800;
    color: white;
    margin-bottom: 12px;
}

.cta-content p {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.75);
    margin-bottom: 28px;
}

.cta-buttons {
    display: flex;
    gap: 12px;
}

.cta-decoration {
    flex-shrink: 0;
}

.cta-svg {
    width: 180px;
    height: 180px;
}

/* ==================== News Section ==================== */
.news {
    padding: 100px 0;
    background: var(--bg-light);
}

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

.news-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    padding: 28px;
    border: 1px solid var(--border);
    display: flex;
    gap: 20px;
    transition: var(--transition);
}

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

.news-date {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 48px;
    padding-top: 4px;
}

.news-day {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.news-month {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.news-content h3 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
    line-height: 1.5;
}

.news-content p {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 12px;
}

.news-link {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.news-link i {
    font-size: 0.65rem;
    transition: transform 0.3s ease;
}

.news-link:hover i {
    transform: translateX(3px);
}

/* ==================== Contact Section ==================== */
.contact {
    padding: 100px 0;
    background: var(--bg-white);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
}

.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-bg);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--primary);
    font-size: 1.1rem;
}

.contact-item h4 {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.contact-item p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.contact-form {
    background: var(--bg-light);
    border-radius: var(--radius-md);
    padding: 36px;
    border: 1px solid var(--border);
}

.contact-form .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text);
}

.form-group input,
.form-group textarea {
    padding: 10px 14px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    font-family: inherit;
    color: var(--text);
    background: var(--bg-white);
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 82, 204, 0.08);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-group.full {
    grid-column: 1 / -1;
    margin-bottom: 16px;
}

.btn-full {
    width: 100%;
    justify-content: center;
    padding: 14px 28px;
    font-size: 1rem;
}

/* ==================== Footer ==================== */
.footer {
    background: #0A1628;
    color: rgba(255, 255, 255, 0.7);
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.footer-logo img {
    display: block;
    height: 36px;
    width: auto;
}

.footer-logo span {
    font-size: 1.05rem;
    font-weight: 700;
    color: white;
}

.footer-brand p {
    font-size: 0.82rem;
    line-height: 1.8;
    margin-bottom: 20px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.footer-social a {
    width: 36px;
    height: 36px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
}

.footer-links h4 {
    font-size: 0.85rem;
    font-weight: 700;
    color: white;
    margin-bottom: 16px;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-links a {
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.5);
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
    padding-left: 4px;
}

.footer-qr {
    text-align: center;
}

.qr-box {
    width: 100px;
    height: 100px;
    background: white;
    border-radius: var(--radius-sm);
    padding: 6px;
    margin: 0 auto 12px;
}

.qr-code {
    width: 100%;
    height: 100%;
}

.footer-qr p {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.5);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    font-size: 0.78rem;
}

.footer-copyright p {
    color: rgba(255, 255, 255, 0.35);
    line-height: 1.8;
}

.footer-copyright a {
    color: rgba(255, 255, 255, 0.5);
}

.footer-copyright a:hover {
    color: white;
}

.footer-ceo {
    color: rgba(255, 255, 255, 0.45);
    display: flex;
    align-items: center;
    gap: 6px;
}

.footer-ceo a {
    color: rgba(255, 255, 255, 0.6);
}

.footer-ceo a:hover {
    color: white;
}

/* ==================== Back to Top & Floating ==================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1rem;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.floating-contact {
    position: fixed;
    bottom: 90px;
    right: 30px;
    z-index: 999;
}

.float-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    width: 56px;
    height: 56px;
    background: var(--accent);
    color: white;
    border-radius: 50%;
    text-decoration: none;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    font-size: 0.7rem;
    font-weight: 600;
    padding-top: 10px;
}

.float-btn i {
    font-size: 1.2rem;
}

.float-btn:hover {
    transform: scale(1.08);
    box-shadow: 0 12px 32px rgba(255, 107, 53, 0.4);
}

/* ==================== Responsive Design ==================== */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .hero-content {
        max-width: 100%;
    }
    .hero-cta, .hero-stats {
        justify-content: center;
    }
    .hero-visual {
        display: none;
    }
    .features-grid,
    .products-grid,
    .industries-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .about-grid {
        grid-template-columns: 1fr;
    }
    .contact-grid {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .footer-brand {
        grid-column: 1 / -1;
    }
    .footer-qr {
        grid-column: 1 / -1;
    }
}

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

    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background: var(--bg-white);
        padding: 16px 0;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    .nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    .nav-list {
        flex-direction: column;
        gap: 0;
    }
    .nav-item > a {
        padding: 12px 24px;
        width: 100%;
        justify-content: space-between;
    }
    .dropdown-menu {
        position: static;
        transform: none;
        box-shadow: none;
        border: none;
        padding: 8px 24px 16px;
        display: none;
    }
    .nav-item.dropdown.active-dropdown .dropdown-menu {
        display: block;
        opacity: 1;
        visibility: visible;
    }
    .btn-menu-mobile {
        display: flex;
    }

    .hero-title {
        font-size: 2rem;
    }
    .hero-desc {
        font-size: 0.9rem;
    }
    .hero-cta {
        flex-direction: column;
    }

    .features-grid,
    .products-grid,
    .industries-grid {
        grid-template-columns: 1fr;
    }
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    .news-grid {
        grid-template-columns: 1fr;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .cta-card {
        flex-direction: column;
        padding: 40px 28px;
        text-align: center;
    }
    .cta-buttons {
        justify-content: center;
    }
    .cta-decoration {
        display: none;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }

    .contact-form .form-row {
        grid-template-columns: 1fr;
    }

    .about-stats-row {
        gap: 20px;
        flex-wrap: wrap;
    }

    .floating-contact {
        bottom: 80px;
        right: 16px;
    }
    .back-to-top {
        bottom: 20px;
        right: 16px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.6rem;
    }
    .product-tabs {
        flex-wrap: wrap;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
}