/* ========== Base Reset & CSS Variables ========== */
:root {
    --primary: #0f172a;
    --secondary: #1e293b;
    --accent: #ea580c;
    --accent-hover: #c2410c;
    --text-light: #f8fafc;
    --text-dark: #1e293b;
    --text-muted: #64748b;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
}

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

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    line-height: 1.65;
    color: var(--text-dark);
    background: var(--bg-light);
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section {
    padding: 5rem 0;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 0.5rem;
    position: relative;
}

.section-subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 3rem;
    font-size: 1rem;
}

.accent-line {
    width: 60px;
    height: 4px;
    background: var(--accent);
    margin: 0 auto 1rem;
    border-radius: 2px;
}

/* ========== Navigation Bar ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: transparent;
    transition: all 0.3s ease;
    padding: 1rem 0;
}

.navbar.scrolled {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    padding: 0.6rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icon {
    width: auto;
    height: 38px;
    object-fit: contain;
}

.nav-menu {
    display: flex;
    gap: 2.5rem;
}

.nav-menu a {
    color: var(--text-light);
    font-size: 0.95rem;
    font-weight: 500;
    position: relative;
    transition: color 0.3s;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s;
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.nav-menu a:hover {
    color: var(--accent);
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-light);
    font-size: 1.5rem;
    cursor: pointer;
}

/* ========== Hero Section ========== */
.hero {
    min-height: 100vh;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.5;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 820px;
}

.hero-tag {
    display: inline-block;
    background: rgba(234, 88, 12, 0.15);
    color: var(--accent);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(234, 88, 12, 0.3);
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    color: var(--text-light);
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.hero h1 span {
    color: var(--accent);
}

.hero p {
    font-size: 1.25rem;
    color: #94a3b8;
    margin-bottom: 2.5rem;
    max-width: 640px;
}

.btn-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(234, 88, 12, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--text-light);
    border: 2px solid rgba(255,255,255,0.2);
}

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.scroll-down {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255,255,255,0.5);
    animation: bounce 2s infinite;
    cursor: pointer;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

/* ========== Core Business ========== */
.business {
    background: var(--bg-white);
}

.business-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.business-card {
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2.5rem 2rem;
    text-align: center;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.business-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--accent);
    transform: scaleX(0);
    transition: transform 0.3s;
}

.business-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.business-card:hover::before {
    transform: scaleX(1);
}

.business-icon {
    width: 64px;
    height: 64px;
    background: rgba(234, 88, 12, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: var(--accent);
    font-size: 1.75rem;
}

.business-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.business-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

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

.product-category {
    margin-bottom: 3.5rem;
}

.product-category:last-child {
    margin-bottom: 0;
}

.category-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 1.5rem;
    padding-left: 1rem;
    border-left: 4px solid var(--accent);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.category-title .count {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
    background: white;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    border: 1px solid var(--border);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.product-card {
    background: var(--bg-white);
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--border);
    transition: all 0.3s;
    cursor: pointer;
}

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

.product-img {
    width: 100%;
    height: 180px;
    background: linear-gradient(135deg, #e2e8f0 0%, #cbd5e1 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.875rem;
    position: relative;
    overflow: hidden;
}

.product-img::after {
    content: "Product Image";
    position: absolute;
    color: #94a3b8;
    font-size: 0.875rem;
}

.product-info {
    padding: 1.25rem;
}

.product-info h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.product-info p {
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.product-tag {
    display: inline-block;
    font-size: 0.75rem;
    padding: 0.2rem 0.5rem;
    background: rgba(234, 88, 12, 0.1);
    color: var(--accent);
    border-radius: 4px;
    margin-top: 0.75rem;
    font-weight: 500;
}

/* ========== Technical Consulting ========== */
.consulting {
    background: var(--primary);
    color: var(--text-light);
    position: relative;
    overflow: hidden;
}

.consulting .section-title {
    color: var(--text-light);
}

.consulting .section-subtitle {
    color: #94a3b8;
}

.consulting-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-top: 2rem;
}

.consult-item {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 10px;
    padding: 2rem;
    transition: all 0.3s;
}

.consult-item:hover {
    background: rgba(255,255,255,0.08);
    transform: translateX(5px);
    border-color: var(--accent);
}

.consult-item h3 {
    font-size: 1.15rem;
    margin-bottom: 0.75rem;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.consult-item h3 .num {
    color: var(--accent);
    font-weight: 800;
    font-size: 1.25rem;
}

.consult-item p {
    color: #94a3b8;
    font-size: 0.95rem;
    line-height: 1.7;
}

.consulting-cta {
    text-align: center;
    margin-top: 3rem;
}

.consulting-cta p {
    color: #94a3b8;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

/* ========== About Us ========== */
.about {
    background: var(--bg-white);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text h3 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.about-text p {
    color: var(--text-muted);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 2.5rem;
}

.stat-item {
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: 10px;
    border: 1px solid var(--border);
}

.stat-num {
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent);
    display: block;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.about-image {
    background: linear-gradient(135deg, #e2e8f0, #cbd5e1);
    border-radius: 12px;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #94a3b8;
    position: relative;
    overflow: hidden;
}

.about-image::after {
    content: "Company / Equipment Photo";
    position: absolute;
}

/* ========== Contact Section ========== */
.contact {
    background: var(--bg-light);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.contact-card {
    background: var(--bg-white);
    padding: 2.5rem 2rem;
    border-radius: 12px;
    text-align: center;
    border: 1px solid var(--border);
    transition: all 0.3s;
}

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

.contact-icon {
    width: 56px;
    height: 56px;
    background: rgba(234, 88, 12, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.25rem;
    color: var(--accent);
    font-size: 1.5rem;
}

.contact-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
}

.contact-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

.contact-card .highlight {
    color: var(--accent);
    font-weight: 700;
    font-size: 1.1rem;
    margin-top: 0.5rem;
    display: block;
}

.qr-placeholder {
    width: 120px;
    height: 120px;
    margin: 1rem auto 0;
    border-radius: 8px;
    object-fit: contain;
}

/* ========== Footer ========== */
.footer {
    background: var(--primary);
    color: #94a3b8;
    padding: 2.5rem 0;
    text-align: center;
    border-top: 1px solid rgba(255,255,255,0.05);
}

.footer p {
    font-size: 0.875rem;
}

/* ========== Back To Top ========== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    z-index: 999;
    box-shadow: 0 4px 12px rgba(234, 88, 12, 0.4);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--accent-hover);
    transform: translateY(-3px);
}

/* ========== Scroll Fade-in Animation ========== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

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

/* ========== Responsive ========== */
@media (max-width: 1024px) {
    .product-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        max-width: 300px;
        height: 100vh;
        background: var(--primary);
        flex-direction: column;
        padding: 5rem 2rem 2rem;
        gap: 1.5rem;
        transition: right 0.3s ease;
        box-shadow: -5px 0 15px rgba(0,0,0,0.3);
    }

    .nav-menu.active {
        right: 0;
    }

    .mobile-toggle {
        display: block;
        z-index: 1001;
    }

    .mobile-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0,0,0,0.5);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s;
        z-index: 999;
    }

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

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .business-grid,
    .product-grid,
    .consulting-grid,
    .about-content,
    .contact-grid,
    .about-stats {
        grid-template-columns: 1fr;
    }

    .about-image {
        height: 250px;
        order: -1;
    }

    .section {
        padding: 3rem 0;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .btn-group {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.6rem;
    }

    .product-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .product-img {
        height: 140px;
    }

    .consult-item {
        padding: 1.5rem;
    }
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}