/* ========================================
   大青云科技 - 亮色科技主题
   Light Tech-Blue Design System
   ======================================== */

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

:root {
    /* Accent Colors */
    --brand-blue: #1677ff;
    --brand-cyan: #00b4e6;
    --brand-deep: #0d5bbd;
    --brand-gradient: linear-gradient(135deg, #1677ff 0%, #00b4e6 100%);

    /* Backgrounds — Light */
    --bg-page: #f2f6fc;
    --bg-section: #ffffff;
    --bg-card: #ffffff;
    --bg-card-hover: #f0f6ff;
    --bg-soft: #e8f1fb;
    --bg-input: #ffffff;

    /* Text Colors — Dark */
    --text-primary: #1c2b45;
    --text-secondary: #4a5b75;
    --text-muted: #7a8aa3;
    --text-bright: #12233d;

    /* Borders */
    --border-light: #e3eaf3;
    --border-medium: #d4ddeb;
    --border-brand: rgba(22, 119, 255, 0.4);

    /* Shadows */
    --shadow-card: 0 2px 12px rgba(28, 60, 110, 0.08);
    --shadow-hover: 0 8px 28px rgba(22, 119, 255, 0.16);

    /* Layout */
    --radius: 12px;
    --radius-lg: 20px;
    --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1280px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--text-primary);
    background: linear-gradient(180deg, #eef4fb 0%, #f5f8fd 30%, #f8fafd 70%, #eef4fb 100%);
    background-attachment: fixed;
    line-height: 1.7;
    overflow-x: hidden;
    position: relative;
}

/* Subtle light grid background */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(22, 119, 255, 0.045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(22, 119, 255, 0.045) 1px, transparent 1px);
    background-size: 56px 56px;
    z-index: 0;
    pointer-events: none;
}

/* Soft top glow */
body::after {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse at 15% 0%, rgba(22, 119, 255, 0.07) 0%, transparent 55%),
        radial-gradient(ellipse at 85% 30%, rgba(0, 180, 230, 0.05) 0%, transparent 55%);
    z-index: 0;
    pointer-events: none;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #e8eef6;
}
::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--brand-blue), var(--brand-cyan));
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--brand-blue);
}

/* Selection */
::selection {
    background: rgba(22, 119, 255, 0.18);
    color: var(--text-bright);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 1;
}

/* --- Top Bar --- */
.top-bar {
    background: linear-gradient(90deg, #1257b0 0%, #1677ff 60%, #00a8d8 100%);
    color: rgba(255, 255, 255, 0.92);
    font-size: 13px;
    padding: 7px 0;
    position: relative;
    z-index: 1001;
}

.top-bar-left span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.top-bar-left span::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #7dffb0;
}

.top-bar-right a {
    color: rgba(255, 255, 255, 0.92);
    margin-left: 24px;
    transition: var(--transition);
}

.top-bar-right a:hover {
    color: #ffffff;
    text-decoration: underline;
}

/* --- Header / Navigation --- */
.header {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-light);
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 4px 20px rgba(28, 60, 110, 0.1);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.logo a {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-img {
    height: 42px;
    width: auto;
    display: block;
    transition: var(--transition);
}

.logo a:hover .logo-img {
    transform: scale(1.04);
}

.nav ul {
    display: flex;
    gap: 4px;
}

.nav ul li a {
    display: block;
    padding: 8px 20px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: 8px;
    transition: var(--transition);
    position: relative;
}

.nav ul li a::before {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--brand-gradient);
    border-radius: 2px;
    transition: var(--transition);
    transform: translateX(-50%);
}

.nav ul li a:hover,
.nav ul li a.active {
    color: var(--brand-blue);
    background: rgba(22, 119, 255, 0.07);
}

.nav ul li a:hover::before,
.nav ul li a.active::before {
    width: 60%;
}

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

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--brand-blue);
    border-radius: 2px;
    transition: var(--transition);
}

/* --- Hero Section --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: var(--text-bright);
    overflow: hidden;
    background:
        radial-gradient(ellipse at 25% 30%, rgba(22, 119, 255, 0.12) 0%, transparent 55%),
        radial-gradient(ellipse at 75% 60%, rgba(0, 180, 230, 0.1) 0%, transparent 55%),
        linear-gradient(180deg, #e8f1fb 0%, #f0f6fd 55%, #f7fafd 100%);
}

/* Static decorative grid floor */
.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-bg::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 55%;
    background-image:
        linear-gradient(rgba(22, 119, 255, 0.12) 1px, transparent 1px),
        linear-gradient(90deg, rgba(22, 119, 255, 0.12) 1px, transparent 1px);
    background-size: 42px 42px;
    transform: perspective(600px) rotateX(62deg);
    transform-origin: center bottom;
    mask-image: linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.45) 55%, rgba(0,0,0,0.9) 100%);
    -webkit-mask-image: linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.45) 55%, rgba(0,0,0,0.9) 100%);
}

.hero-overlay {
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    padding: 100px 24px 50px;
    max-width: 900px;
}

.hero h1 {
    font-size: 52px;
    font-weight: 800;
    margin-bottom: 20px;
    letter-spacing: 3px;
    color: var(--text-bright);
}

.hero h1 span {
    display: inline-block;
    background: var(--brand-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    padding: 0;
    margin-left: 10px;
    font-size: 28px;
    vertical-align: middle;
    letter-spacing: 2px;
    position: relative;
}

.hero h1 span::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--brand-gradient);
    border-radius: 2px;
}

.hero-subtitle {
    font-size: 22px;
    font-weight: 400;
    margin-bottom: 14px;
    color: var(--text-secondary);
    letter-spacing: 1px;
}

.hero-desc {
    font-size: 15px;
    line-height: 1.9;
    color: var(--text-secondary);
    margin-bottom: 36px;
}

.hero-btns {
    display: flex;
    gap: 20px;
    justify-content: center;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 36px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-align: center;
    position: relative;
    letter-spacing: 1px;
}

.btn-primary {
    background: var(--brand-gradient);
    color: #fff;
    box-shadow: 0 4px 16px rgba(22, 119, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(22, 119, 255, 0.42);
}

.btn-outline {
    background: #ffffff;
    color: var(--brand-blue);
    border: 1px solid var(--brand-blue);
}

.btn-outline:hover {
    background: rgba(22, 119, 255, 0.07);
    border-color: var(--brand-deep);
    color: var(--brand-deep);
    transform: translateY(-2px);
}

.btn-block {
    width: 100%;
}

/* Hero Stats */
.hero-stats {
    position: relative;
    z-index: 2;
    width: 100%;
    padding: 0 24px 60px;
}

.stats-grid {
    display: flex;
    justify-content: center;
    gap: 80px;
    flex-wrap: wrap;
}

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

.stat-item::after {
    content: '';
    position: absolute;
    top: 50%;
    right: -40px;
    width: 1px;
    height: 40px;
    background: var(--border-medium);
    transform: translateY(-50%);
}

.stat-item:last-child::after {
    display: none;
}

.stat-number {
    display: block;
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 4px;
    background: var(--brand-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    font-size: 14px;
    color: var(--text-muted);
    letter-spacing: 2px;
}

/* --- Section Common --- */
.section {
    padding: 100px 0;
    position: relative;
    z-index: 1;
}

.section:nth-child(even) {
    background: rgba(255, 255, 255, 0.6);
}

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

.section-header h2 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 8px;
    color: var(--text-bright);
    letter-spacing: 2px;
}

.section-subtitle {
    font-size: 14px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 4px;
    margin-bottom: 16px;
    font-family: 'Courier New', monospace;
}

.divider {
    width: 60px;
    height: 3px;
    background: var(--brand-gradient);
    margin: 0 auto;
    border-radius: 2px;
    position: relative;
}

.divider::before,
.divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--brand-blue);
    transform: translateY(-50%);
}

.divider::before { left: -12px; }
.divider::after { right: -12px; }

.section-desc {
    margin-top: 20px;
    color: var(--text-secondary);
    font-size: 16px;
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
}

/* --- About Section --- */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.about-text h3 {
    font-size: 28px;
    color: var(--text-bright);
    margin-bottom: 20px;
    position: relative;
    padding-left: 16px;
}

.about-text h3::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--brand-gradient);
    border-radius: 2px;
}

.about-lead {
    font-size: 17px;
    color: var(--brand-blue);
    font-weight: 600;
    margin-bottom: 16px;
    line-height: 1.8;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 14px;
    line-height: 1.85;
}

.about-info {
    margin-top: 24px;
    padding: 24px;
    background: var(--bg-soft);
    border-radius: var(--radius);
    border: 1px solid var(--border-brand);
}

.about-info .info-item {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 10px;
    line-height: 1.6;
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.about-info .info-item::before {
    content: '\25B8';
    color: var(--brand-blue);
    flex-shrink: 0;
    margin-top: 1px;
}

.about-info .info-item:last-child {
    margin-bottom: 0;
}

.about-info .info-item strong {
    color: var(--text-bright);
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

/* Feature Cards */
.feature-card {
    background: var(--bg-card);
    padding: 32px 24px;
    border-radius: var(--radius);
    transition: var(--transition);
    text-align: center;
    border: 1px solid var(--border-light);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 20px;
    height: 20px;
    border-top: 2px solid var(--brand-blue);
    border-left: 2px solid var(--brand-blue);
    border-radius: var(--radius) 0 0 0;
    opacity: 0;
    transition: var(--transition);
}

.feature-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 20px;
    height: 20px;
    border-bottom: 2px solid var(--brand-blue);
    border-right: 2px solid var(--brand-blue);
    border-radius: 0 0 var(--radius) 0;
    opacity: 0;
    transition: var(--transition);
}

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

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

.feature-icon {
    font-size: 40px;
    margin-bottom: 14px;
    display: inline-block;
}

.feature-card h4 {
    font-size: 16px;
    color: var(--text-bright);
    margin-bottom: 8px;
    letter-spacing: 1px;
}

.feature-card p {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.6;
}

/* --- Products Section --- */
.product-tabs {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 56px;
}

.tab-btn {
    padding: 10px 28px;
    background: var(--bg-card);
    border: 1px solid var(--border-medium);
    border-radius: 30px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-card);
}

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

.tab-btn.active {
    background: var(--brand-gradient);
    color: #fff;
    border-color: transparent;
    box-shadow: 0 4px 16px rgba(22, 119, 255, 0.35);
    font-weight: 600;
}

.brand-section {
    margin-bottom: 56px;
}

.brand-header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-light);
    position: relative;
}

.brand-header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 2px;
    background: var(--brand-gradient);
    border-radius: 2px;
}

.brand-header h3 {
    font-size: 26px;
    color: var(--text-bright);
    margin-bottom: 8px;
    letter-spacing: 1px;
}

.brand-header p {
    font-size: 14px;
    color: var(--text-muted);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

/* Product Cards */
.product-card {
    background: var(--bg-card);
    padding: 28px 24px;
    border-radius: var(--radius);
    border: 1px solid var(--border-light);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--brand-gradient);
    opacity: 0;
    transition: var(--transition);
}

.product-card::after {
    content: '\70B9\51FB\67E5\770B\8BE6\60C5 \2192';
    position: absolute;
    bottom: 20px;
    right: 24px;
    font-size: 12px;
    color: var(--brand-blue);
    opacity: 0;
    transition: var(--transition);
    font-weight: 600;
}

.product-card:hover::after {
    opacity: 1;
}

.product-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-brand);
    background: var(--bg-card-hover);
    box-shadow: var(--shadow-hover);
}

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

.product-img {
    width: 100%;
    height: 150px;
    background: linear-gradient(135deg, #eef4fd 0%, #e6f2fe 100%);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    overflow: hidden;
    border: 1px solid var(--border-light);
    position: relative;
}

.product-img::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(22, 119, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(22, 119, 255, 0.05) 1px, transparent 1px);
    background-size: 20px 20px;
    opacity: 0.5;
}

.product-img img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 16px;
    transition: var(--transition);
    position: relative;
    z-index: 1;
}

.product-card:hover .product-img img {
    transform: scale(1.06);
}

.product-card h4 {
    font-size: 17px;
    color: var(--text-bright);
    margin-bottom: 10px;
    letter-spacing: 0.5px;
}

.product-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.65;
    margin-bottom: 14px;
}

.product-models {
    display: inline-block;
    font-size: 12px;
    color: var(--brand-blue);
    background: rgba(22, 119, 255, 0.08);
    border: 1px solid var(--border-brand);
    padding: 4px 14px;
    border-radius: 20px;
    font-weight: 500;
}

/* --- Solutions Section --- */
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 28px;
}

.solution-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-light);
    transition: var(--transition);
    position: relative;
    box-shadow: var(--shadow-card);
}

.solution-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-brand);
    box-shadow: var(--shadow-hover);
}

.solution-img {
    height: 130px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.solution-img::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.25) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.25) 1px, transparent 1px);
    background-size: 25px 25px;
}

.solution-manufacture { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.solution-logistics { background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); }
.solution-retail { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
.solution-medical { background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%); }
.solution-public { background: linear-gradient(135deg, #fa709a 0%, #fee140 100%); }
.solution-finance { background: linear-gradient(135deg, #a18cd1 0%, #fbc2eb 100%); }

.solution-icon {
    font-size: 52px;
    position: relative;
    z-index: 1;
    filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.18));
}

.solution-info {
    padding: 28px;
}

.solution-info h4 {
    font-size: 19px;
    color: var(--text-bright);
    margin-bottom: 10px;
    letter-spacing: 0.5px;
}

.solution-info p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.65;
    margin-bottom: 14px;
}

.solution-info ul li {
    font-size: 13px;
    color: var(--text-muted);
    padding: 5px 0;
    padding-left: 22px;
    position: relative;
}

.solution-info ul li::before {
    content: '\25B9';
    position: absolute;
    left: 0;
    color: var(--brand-blue);
}

/* --- Partners Section --- */
.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 28px;
}

.partner-card {
    background: var(--bg-card);
    padding: 40px 24px;
    border-radius: var(--radius);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-light);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.partner-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-brand);
    box-shadow: var(--shadow-hover);
}

.partner-logo {
    width: 100px;
    height: 100px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    position: relative;
}

.partner-logo::before {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: 22px;
    padding: 2px;
    background: linear-gradient(135deg, rgba(22, 119, 255, 0.5), rgba(0, 180, 230, 0.4));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: var(--transition);
}

.partner-card:hover .partner-logo::before {
    opacity: 1;
}

.partner-logo span {
    font-size: 18px;
    font-weight: 800;
    color: #fff;
    letter-spacing: 2px;
    z-index: 1;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

.urovo-logo { background: linear-gradient(135deg, #0d5bbd, #00b4e6); }
.idata-logo { background: linear-gradient(135deg, #0a9e5f, #00b4e6); }
.seuic-logo { background: linear-gradient(135deg, #e07a00, #e5484d); }
.zebra-logo { background: linear-gradient(135deg, #39466e, #6c7a9e); }

.partner-card h4 {
    font-size: 18px;
    color: var(--text-bright);
    margin-bottom: 10px;
}

.partner-card p {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 16px;
}

.partner-card a {
    font-size: 14px;
    color: var(--brand-blue);
    font-weight: 600;
    transition: var(--transition);
}

.partner-card a:hover {
    color: var(--brand-deep);
}

/* --- Contact Section --- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info h3,
.contact-form h3 {
    font-size: 24px;
    color: var(--text-bright);
    margin-bottom: 16px;
}

.contact-intro {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 28px;
}

.contact-items {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    padding: 16px;
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border-light);
    transition: var(--transition);
    box-shadow: var(--shadow-card);
}

.contact-item:hover {
    border-color: var(--border-brand);
    background: var(--bg-card-hover);
}

.contact-icon {
    font-size: 22px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(22, 119, 255, 0.09);
    border: 1px solid var(--border-brand);
    border-radius: 10px;
    flex-shrink: 0;
}

.contact-item h5 {
    font-size: 14px;
    color: var(--text-bright);
    margin-bottom: 2px;
}

.contact-item p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.contact-item a {
    color: var(--brand-blue);
    transition: var(--transition);
}

.contact-item a:hover {
    color: var(--brand-deep);
}

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

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

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.form-group label span {
    color: #e5484d;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 14px;
    border: 1px solid var(--border-medium);
    border-radius: 8px;
    font-family: inherit;
    transition: var(--transition);
    outline: none;
    background: var(--bg-input);
    color: var(--text-primary);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--brand-blue);
    box-shadow: 0 0 0 3px rgba(22, 119, 255, 0.12);
    background: #f8fbff;
}

.form-group textarea {
    resize: vertical;
}

/* --- Footer --- */
.footer {
    background: #16263f;
    color: #9fb0c8;
    padding: 64px 0 0;
    position: relative;
    z-index: 1;
    border-top: 1px solid var(--border-light);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    padding-bottom: 40px;
}

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

.footer-logo-img {
    height: 38px;
    width: auto;
    display: block;
}

.footer-about p {
    font-size: 13px;
    line-height: 1.8;
}

.footer h4 {
    font-size: 16px;
    color: #ffffff;
    margin-bottom: 16px;
    position: relative;
    padding-bottom: 10px;
}

.footer h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--brand-gradient);
}

.footer ul li {
    margin-bottom: 8px;
}

.footer ul li a {
    font-size: 13px;
    transition: var(--transition);
    color: #9fb0c8;
}

.footer ul li a:hover {
    color: #5cc0ff;
    padding-left: 4px;
}

.footer-contact p {
    font-size: 13px;
    margin-bottom: 8px;
    line-height: 1.6;
}

.footer-contact a {
    color: #9fb0c8;
    transition: var(--transition);
}

.footer-contact a:hover {
    color: #5cc0ff;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 20px 0;
    text-align: center;
    font-size: 13px;
    color: #8fa0b8;
}

/* --- Back to Top --- */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--brand-gradient);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    box-shadow: 0 4px 16px rgba(22, 119, 255, 0.35);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    z-index: 999;
    border: none;
    cursor: pointer;
}

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

.back-to-top:hover {
    box-shadow: 0 6px 22px rgba(22, 119, 255, 0.5);
    transform: translateY(-4px) scale(1.05);
}

/* --- Animations --- */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Product Modal --- */
.product-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(28, 43, 69, 0.5);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    padding: 20px;
}

.product-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.product-modal {
    background: #ffffff;
    border-radius: var(--radius-lg);
    max-width: 920px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
    position: relative;
    border: 1px solid var(--border-light);
    box-shadow: 0 24px 60px rgba(20, 45, 90, 0.25);
    transform: translateY(20px) scale(0.98);
    transition: transform 0.3s ease;
}

.product-modal-overlay.active .product-modal {
    transform: translateY(0) scale(1);
}

.product-modal::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--brand-gradient);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 20px;
    width: 38px;
    height: 38px;
    border: 1px solid var(--border-medium);
    background: #f5f8fd;
    border-radius: 50%;
    font-size: 22px;
    cursor: pointer;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    z-index: 10;
    line-height: 1;
}

.modal-close:hover {
    background: rgba(229, 72, 77, 0.08);
    border-color: #e5484d;
    color: #e5484d;
    transform: rotate(90deg);
}

.modal-body {
    padding: 44px;
}

.modal-header {
    display: flex;
    gap: 32px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.modal-image {
    flex: 0 0 280px;
    height: 280px;
    background: linear-gradient(135deg, #eef4fd 0%, #e6f2fe 100%);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border: 1px solid var(--border-light);
    position: relative;
}

.modal-image::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(22, 119, 255, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(22, 119, 255, 0.06) 1px, transparent 1px);
    background-size: 20px 20px;
}

.modal-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 24px;
    position: relative;
    z-index: 1;
}

.modal-info {
    flex: 1;
    min-width: 250px;
}

.modal-brand {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    color: var(--brand-blue);
    background: rgba(22, 119, 255, 0.08);
    border: 1px solid var(--border-brand);
    padding: 5px 18px;
    border-radius: 20px;
    margin-bottom: 12px;
}

.modal-info h3 {
    font-size: 26px;
    color: var(--text-bright);
    margin-bottom: 8px;
    letter-spacing: 1px;
}

.modal-info .modal-desc {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.7;
}

.modal-specs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 24px;
}

.modal-spec-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
}

.modal-spec-item .spec-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--brand-blue);
    flex-shrink: 0;
}

.modal-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 12px 28px;
    background: var(--brand-gradient);
    color: #fff;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
    text-decoration: none;
    box-shadow: 0 4px 14px rgba(22, 119, 255, 0.3);
}

.modal-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(22, 119, 255, 0.45);
    color: #fff;
}

/* Modal model cards */
.modal-models {
    border-top: 1px solid var(--border-light);
    padding-top: 24px;
}

.modal-models h4 {
    font-size: 18px;
    color: var(--text-bright);
    margin-bottom: 16px;
}

.models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
}

.model-card {
    background: #f7fafd;
    padding: 16px;
    border-radius: 8px;
    border: 1px solid var(--border-light);
    transition: var(--transition);
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.model-card:hover {
    border-color: var(--border-brand);
    box-shadow: 0 4px 16px rgba(22, 119, 255, 0.12);
    transform: translateY(-2px);
}

.model-card-link {
    text-decoration: none;
    position: relative;
    cursor: pointer;
}

.model-card-link:hover {
    border-color: var(--brand-blue);
    box-shadow: 0 4px 20px rgba(22, 119, 255, 0.18);
    transform: translateY(-2px);
    background: var(--bg-card-hover);
}

.model-goto {
    position: absolute;
    bottom: 8px;
    right: 12px;
    font-size: 12px;
    color: var(--brand-blue);
    font-weight: 500;
    opacity: 0;
    transition: opacity 0.2s;
}

.model-card-link:hover .model-goto {
    opacity: 1;
}

.models-hint {
    font-size: 12px;
    font-weight: 400;
    color: var(--brand-blue);
    margin-left: 8px;
}

.model-thumb {
    width: 60px;
    height: 60px;
    background: #ffffff;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border: 1px solid var(--border-light);
    flex-shrink: 0;
}

.model-thumb img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 4px;
}

.model-thumb .model-svg {
    width: 36px;
    height: 36px;
    opacity: 0.6;
}

.model-info h5 {
    font-size: 14px;
    color: var(--text-bright);
    margin-bottom: 4px;
}

.model-info p {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.5;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }
    .solutions-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 32px;
    }
    .hero h1 span {
        font-size: 20px;
        margin-left: 4px;
    }
    .hero-subtitle {
        font-size: 17px;
    }
    .hero-desc {
        font-size: 13px;
    }
    .hero-content {
        padding: 70px 16px 30px;
    }
    .section {
        padding: 64px 0;
    }
    .section-header h2 {
        font-size: 28px;
    }
    .about-features {
        grid-template-columns: 1fr;
    }
    .stats-grid {
        gap: 36px;
    }
    .stat-number {
        font-size: 32px;
    }
    .stat-item::after {
        display: none;
    }
    .product-grid {
        grid-template-columns: 1fr;
    }
    .partners-grid {
        grid-template-columns: 1fr 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .form-row {
        grid-template-columns: 1fr;
    }

    .menu-toggle {
        display: flex;
    }
    .nav {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        box-shadow: 0 8px 32px rgba(28, 60, 110, 0.15);
        padding: 16px 0;
        transform: translateY(-120%);
        opacity: 0;
        transition: var(--transition);
        z-index: 999;
        border-bottom: 1px solid var(--border-light);
    }
    .nav.active {
        transform: translateY(0);
        opacity: 1;
    }
    .nav ul {
        flex-direction: column;
        gap: 0;
    }
    .nav ul li a {
        padding: 14px 24px;
        border-radius: 0;
    }
    .contact-form {
        padding: 24px;
    }
    .modal-header {
        flex-direction: column;
    }
    .modal-image {
        flex: 0 0 200px;
        height: 200px;
    }
    .modal-body {
        padding: 28px;
    }
    .modal-specs {
        grid-template-columns: 1fr;
    }
    .models-grid {
        grid-template-columns: 1fr;
    }
    .logo-img {
        height: 34px;
    }
    .footer-logo-img {
        height: 32px;
    }
}

@media (max-width: 480px) {
    .top-bar .container {
        flex-direction: column;
        gap: 4px;
    }
    .hero-btns {
        flex-direction: column;
    }
    .partners-grid {
        grid-template-columns: 1fr;
    }
    .product-tabs {
        flex-direction: column;
        align-items: center;
    }
    .tab-btn {
        width: 100%;
        max-width: 260px;
        text-align: center;
    }
}