/* ============================================
   ĐỨC HOÀNG - Industrial B2B Landing Page
   Professional Mechanical Engineering Style
   ============================================ */

/* CSS Variables */
:root {
    /* Primary Colors - Industrial Blue */
    --primary-900: #0a1628;
    --primary-800: #0f2744;
    --primary-700: #153660;
    --primary-600: #1a4578;
    --primary-500: #1e5490;
    --primary-400: #2d6aa8;
    --primary-300: #4a8ac4;
    --primary-200: #7eb0db;
    --primary-100: #b8d4ed;
    --primary-50: #e8f2fa;

    /* Accent Colors - Metallic Gold/Orange */
    --accent-500: #d4830a;
    --accent-400: #e99a1a;
    --accent-300: #f0b042;
    --accent-200: #f5c978;
    --accent-100: #fae5b8;

    /* Neutral Colors - Steel Gray */
    --gray-900: #111827;
    --gray-800: #1f2937;
    --gray-700: #374151;
    --gray-600: #4b5563;
    --gray-500: #6b7280;
    --gray-400: #9ca3af;
    --gray-300: #d1d5db;
    --gray-200: #e5e7eb;
    --gray-100: #f3f4f6;
    --gray-50: #f9fafb;

    /* Semantic Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-secondary: 'Roboto', sans-serif;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;

    /* Container */
    --container-max: 1280px;
    --container-padding: 1.5rem;
}

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

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

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--gray-700);
    background-color: #fff;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
}

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

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

ul, ol {
    list-style: none;
}

button, input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

button {
    cursor: pointer;
    border: none;
    background: none;
}

/* ============================================
   Utility Classes
   ============================================ */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    box-sizing: border-box;
}

.section {
    padding: var(--spacing-4xl) 0;
    overflow: hidden;
    width: 100%;
}

.section-dark {
    background: linear-gradient(135deg, var(--primary-900) 0%, var(--primary-800) 100%);
    color: #fff;
    overflow: hidden;
}

.section-gray {
    background-color: var(--gray-50);
    overflow: hidden;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--gray-900);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.125rem; }

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-header-light h2,
.section-header-light .section-title {
    color: #fff;
}

.section-header-light .section-desc {
    color: var(--gray-300);
}

.section-tag {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent-400);
    margin-bottom: var(--spacing-md);
}

.section-title {
    margin-bottom: var(--spacing-md);
}

.section-desc {
    font-size: 1.125rem;
    color: var(--gray-600);
    max-width: 700px;
    margin: 0 auto;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-400) 0%, var(--accent-500) 100%);
    color: #fff;
    box-shadow: 0 4px 14px rgba(212, 131, 10, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--accent-500) 0%, #b86e08 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(212, 131, 10, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-full {
    width: 100%;
}

/* ============================================
   Header / Navigation
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    z-index: 1000;
    padding: var(--spacing-md) 0;
    transition: all var(--transition-normal);
}

.header.scrolled {
    background: rgba(10, 22, 40, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-sm) 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 800;
    color: #fff;
}

.logo-icon {
    font-size: 2rem;
    color: var(--accent-400);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.8);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-400);
    transition: width var(--transition-normal);
}

.nav-link:hover {
    color: #fff;
}

.nav-link:hover::after {
    width: 100%;
}

.nav-cta {
    padding: 0.5rem 1.25rem;
    background: var(--accent-400);
    color: #fff !important;
    border-radius: var(--radius-md);
}

.nav-cta::after {
    display: none;
}

.nav-cta:hover {
    background: var(--accent-500);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 5px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: #fff;
    transition: all var(--transition-fast);
    border-radius: 2px;
}

/* Mobile Navigation Backdrop */
.nav-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 998;
    display: none;
}

.nav-backdrop.active {
    opacity: 1;
    visibility: visible;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-900) 0%, var(--primary-800) 50%, var(--primary-700) 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('https://images.unsplash.com/photo-1565043589221-1a6fd9ae45c7?w=1920&q=80');
    background-size: cover;
    background-position: center;
    opacity: 0.15;
}

.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, transparent 0%, rgba(10, 22, 40, 0.8) 100%);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(212, 131, 10, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(30, 84, 144, 0.2) 0%, transparent 50%);
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    color: #fff;
    padding: var(--spacing-4xl) 0;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.5rem 1rem;
    background: rgba(212, 131, 10, 0.2);
    border: 1px solid rgba(212, 131, 10, 0.4);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--accent-300);
    margin-bottom: var(--spacing-xl);
}

.hero-badge i {
    font-size: 1rem;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    color: #fff;
}

.hero-title .highlight {
    background: linear-gradient(135deg, var(--accent-300) 0%, var(--accent-400) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--gray-300);
    max-width: 700px;
    margin: 0 auto var(--spacing-2xl);
    line-height: 1.7;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
}

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

.stat-number {
    display: block;
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    color: var(--accent-400);
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-400);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-divider {
    width: 1px;
    height: 50px;
    background: rgba(255, 255, 255, 0.2);
}

.hero-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.hero-scroll {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
}

.hero-scroll a {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: color var(--transition-normal);
}

.hero-scroll a:hover {
    color: #fff;
}

.hero-scroll i {
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(8px); }
    60% { transform: translateY(4px); }
}

/* ============================================
   About Section
   ============================================ */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    width: 100%;
}

.about-grid > * {
    min-width: 0; /* Prevent grid blowout */
}

.about-content {
    padding-right: var(--spacing-xl);
}

.about-lead {
    font-size: 1.25rem;
    color: var(--gray-800);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.about-content p {
    color: var(--gray-600);
    margin-bottom: var(--spacing-xl);
}

.about-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--gray-700);
    font-weight: 500;
}

.feature-item i {
    color: var(--success);
    font-size: 1.125rem;
}

.about-image {
    position: relative;
    overflow: visible;
}

.about-image img {
    width: 100%;
    height: 500px;
    object-fit: cover;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-2xl);
}

.about-image-overlay {
    position: absolute;
    bottom: -20px;
    left: 20px;
    background: linear-gradient(135deg, var(--primary-700) 0%, var(--primary-800) 100%);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    color: #fff;
    box-shadow: var(--shadow-xl);
}

.overlay-number {
    display: block;
    font-size: 3rem;
    font-weight: 800;
    color: var(--accent-400);
    line-height: 1;
}

.overlay-text {
    font-size: 0.875rem;
    color: var(--gray-300);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ============================================
   Capabilities Section
   ============================================ */
.capabilities-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
    width: 100%;
}

.capability-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
    min-width: 0; /* Prevent grid blowout */
}

.capability-card:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-5px);
}

.capability-icon {
    height: 200px;
    overflow: hidden;
}

.capability-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.capability-card:hover .capability-icon img {
    transform: scale(1.05);
}

.capability-content {
    padding: var(--spacing-xl);
}

.capability-content h3 {
    font-size: 1.5rem;
    color: #fff;
    margin-bottom: var(--spacing-md);
}

.capability-content p {
    color: var(--gray-300);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.capability-specs {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.capability-specs li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--gray-400);
}

.capability-specs i {
    color: var(--accent-400);
    width: 20px;
}

/* ============================================
   Technology Section
   ============================================ */
.technology-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
    width: 100%;
}

.tech-card {
    text-align: center;
    padding: var(--spacing-xl);
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
    min-width: 0; /* Prevent grid blowout */
}

.tech-card:hover {
    border-color: var(--primary-300);
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.tech-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
    border-radius: 50%;
}

.tech-icon i {
    font-size: 2rem;
    color: var(--primary-600);
}

.tech-card h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
    color: var(--gray-900);
}

.tech-card p {
    font-size: 0.9375rem;
    color: var(--gray-600);
    line-height: 1.6;
}

.technology-images {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.tech-image {
    position: relative;
    height: 250px;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.tech-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.tech-image:hover img {
    transform: scale(1.05);
}

/* ============================================
   Products Section
   ============================================ */
.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    width: 100%;
}

.product-card {
    background: #fff;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    min-width: 0; /* Prevent grid blowout */
}

.product-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-5px);
}

.product-image {
    position: relative;
    height: 250px;
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.product-card:hover .product-image img {
    transform: scale(1.1);
}

.product-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 22, 40, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

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

.product-content {
    padding: var(--spacing-xl);
}

.product-content h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--gray-900);
}

.product-content > p {
    color: var(--gray-600);
    margin-bottom: var(--spacing-lg);
    font-size: 0.9375rem;
}

.product-specs {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.product-specs li {
    font-size: 0.875rem;
    color: var(--gray-500);
    padding-left: var(--spacing-md);
    position: relative;
}

.product-specs li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-400);
}

/* ============================================
   Quality Section
   ============================================ */
.quality-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    width: 100%;
}

.quality-wrapper > * {
    min-width: 0; /* Prevent grid blowout */
}

.quality-content .section-tag {
    text-align: left;
}

.quality-content .section-title {
    text-align: left;
    margin-bottom: var(--spacing-lg);
}

.quality-content > p {
    color: var(--gray-600);
    margin-bottom: var(--spacing-2xl);
    line-height: 1.7;
}

.quality-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.quality-item {
    display: flex;
    gap: var(--spacing-lg);
}

.quality-icon {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-100) 0%, var(--primary-200) 100%);
    border-radius: var(--radius-lg);
}

.quality-icon i {
    font-size: 1.5rem;
    color: var(--primary-600);
}

.quality-text h4 {
    color: var(--gray-900);
    margin-bottom: var(--spacing-xs);
}

.quality-text p {
    color: var(--gray-600);
    font-size: 0.9375rem;
}

.quality-image {
    position: relative;
}

.quality-image img {
    width: 100%;
    height: 500px;
    object-fit: cover;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-2xl);
}

/* ============================================
   Industries Section
   ============================================ */
.industries-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
    width: 100%;
}

.industry-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
    min-width: 0; /* Prevent grid blowout */
}

.industry-card:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
}

.industry-image {
    height: 300px;
    overflow: hidden;
}

.industry-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.industry-content {
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.industry-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(212, 131, 10, 0.2);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.industry-icon i {
    font-size: 1.5rem;
    color: var(--accent-400);
}

.industry-content h3 {
    font-size: 1.5rem;
    color: #fff;
    margin-bottom: var(--spacing-md);
}

.industry-content p {
    color: var(--gray-300);
    margin-bottom: var(--spacing-lg);
    font-size: 0.9375rem;
    line-height: 1.6;
}

.industry-content ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.industry-content li {
    font-size: 0.875rem;
    color: var(--gray-400);
    padding-left: var(--spacing-lg);
    position: relative;
}

.industry-content li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-400);
    font-weight: bold;
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
    position: relative;
    background: linear-gradient(135deg, var(--primary-800) 0%, var(--primary-900) 100%);
    padding: var(--spacing-4xl) 0;
    overflow: hidden;
    width: 100%;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        url('https://images.unsplash.com/photo-1581092918056-0c4c3acd3789?w=1920&q=80') center/cover,
        linear-gradient(135deg, rgba(10, 22, 40, 0.95) 0%, rgba(15, 39, 68, 0.95) 100%);
    background-blend-mode: overlay;
    opacity: 0.3;
}

.cta-section .container {
    position: relative;
    z-index: 10;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.cta-section .container > * {
    min-width: 0; /* Prevent grid blowout */
}

.cta-content h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    color: #fff;
    margin-bottom: var(--spacing-lg);
}

.cta-content p {
    font-size: 1.125rem;
    color: var(--gray-300);
    line-height: 1.7;
}

.cta-form-wrapper {
    background: #fff;
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-2xl);
}

.form-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.form-header h3 {
    font-size: 1.5rem;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.form-header p {
    color: var(--gray-500);
    font-size: 0.9375rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
}

.form-group label span {
    color: var(--error);
}

.form-group input,
.form-group textarea {
    padding: 0.875rem 1rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    background: var(--gray-50);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-400);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(30, 84, 144, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--gray-400);
}

.form-group input[type="file"] {
    padding: 0.75rem;
    cursor: pointer;
}

.form-group small {
    font-size: 0.75rem;
    color: var(--gray-500);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--gray-900);
    color: var(--gray-400);
    padding: var(--spacing-4xl) 0 var(--spacing-xl);
    overflow: hidden;
    width: 100%;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-3xl);
    width: 100%;
}

.footer-grid > * {
    min-width: 0; /* Prevent grid blowout */
}

.footer-brand .logo {
    margin-bottom: var(--spacing-lg);
}

.footer-brand p {
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.footer-social {
    display: flex;
    gap: var(--spacing-md);
}

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--gray-400);
    transition: all var(--transition-normal);
}

.footer-social a:hover {
    background: var(--accent-400);
    color: #fff;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 1rem;
    color: #fff;
    margin-bottom: var(--spacing-lg);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links a {
    color: var(--gray-400);
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--accent-400);
}

.footer-contact ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    font-size: 0.9375rem;
}

.footer-contact i {
    color: var(--accent-400);
    width: 20px;
    text-align: center;
    margin-top: 2px;
}

.footer-contact a:hover {
    color: var(--accent-400);
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

.footer-bottom-links {
    display: flex;
    gap: var(--spacing-xl);
}

.footer-bottom-links a {
    font-size: 0.875rem;
    color: var(--gray-400);
}

.footer-bottom-links a:hover {
    color: var(--accent-400);
}

/* ============================================
   Back to Top Button
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-600);
    color: #fff;
    border-radius: 50%;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 999;
}

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

.back-to-top:hover {
    background: var(--primary-500);
    transform: translateY(-5px);
}

/* ============================================
   Responsive Design - Desktop Large (1400px+)
   ============================================ */
@media (max-width: 1400px) {
    :root {
        --container-max: 1140px;
    }
}

/* ============================================
   Responsive Design - Desktop (1200px)
   ============================================ */
@media (max-width: 1200px) {
    :root {
        --container-max: 960px;
    }
    
    .technology-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-2xl);
    }
    
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .industry-card {
        grid-template-columns: 1fr;
    }
    
    .industry-image {
        height: 220px;
    }
}

/* ============================================
   Responsive Design - Tablet Landscape (1024px)
   ============================================ */
@media (max-width: 1024px) {
    :root {
        --container-max: 100%;
        --container-padding: 2rem;
    }
    
    .section {
        padding: var(--spacing-3xl) 0;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .about-content {
        padding-right: 0;
        order: 2;
    }
    
    .about-image {
        order: 1;
    }
    
    .about-image img {
        height: 400px;
        width: 100%;
    }
    
    .about-image-overlay {
        bottom: -20px;
        left: 20px;
        padding: var(--spacing-lg);
        max-width: calc(100% - 40px);
    }
    
    .overlay-number {
        font-size: 2.5rem;
    }
    
    .capabilities-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .capability-card {
        display: grid;
        grid-template-columns: 280px 1fr;
    }
    
    .capability-icon {
        height: 100%;
        min-height: 250px;
    }
    
    .industries-grid {
        grid-template-columns: 1fr;
    }
    
    .quality-wrapper {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .quality-image {
        order: -1;
    }
    
    .quality-image img {
        height: 350px;
    }
    
    .cta-section .container {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
        text-align: center;
    }
    
    .cta-content h2 {
        font-size: 2rem;
    }
    
    .nav-link {
        font-size: 0.875rem;
    }
    
    .nav-menu {
        gap: var(--spacing-lg);
    }
}

/* ============================================
   Responsive Design - Tablet Portrait (768px)
   ============================================ */
@media (max-width: 768px) {
    :root {
        --container-padding: 1.25rem;
    }
    
    .section {
        padding: var(--spacing-2xl) 0;
    }
    
    /* Mobile Menu Backdrop */
    .nav-backdrop {
        display: block;
    }
    
    /* Navigation Mobile */
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 85%;
        max-width: 320px;
        height: 100vh;
        height: 100dvh;
        background: linear-gradient(180deg, var(--primary-900) 0%, var(--primary-800) 100%);
        flex-direction: column;
        align-items: stretch;
        padding: 5rem var(--spacing-xl) var(--spacing-2xl);
        gap: 0;
        transition: right var(--transition-normal);
        box-shadow: -5px 0 30px rgba(0, 0, 0, 0.3);
        overflow-y: auto;
        z-index: 1000;
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-menu li {
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .nav-menu li:last-child {
        border-bottom: none;
        margin-top: var(--spacing-md);
    }
    
    .nav-link {
        display: block;
        padding: var(--spacing-md) 0;
        font-size: 1rem;
        color: rgba(255, 255, 255, 0.9);
    }
    
    .nav-link::after {
        display: none;
    }
    
    .nav-cta {
        text-align: center;
        padding: var(--spacing-md) var(--spacing-lg);
        border-radius: var(--radius-md);
        margin-top: var(--spacing-md);
    }
    
    .nav-toggle {
        display: flex;
        z-index: 1001;
        padding: 8px;
    }
    
    .nav-toggle span {
        width: 26px;
        height: 3px;
        border-radius: 2px;
        transition: all var(--transition-fast);
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
        transform: translateX(-10px);
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }
    
    /* Hero Section */
    .hero {
        min-height: 100vh;
        min-height: 100dvh;
    }
    
    .hero-content {
        padding: var(--spacing-3xl) 0 var(--spacing-4xl);
    }
    
    .hero-badge {
        font-size: 0.75rem;
        padding: 0.4rem 0.8rem;
    }
    
    .hero-title {
        font-size: clamp(1.75rem, 8vw, 2.5rem);
        margin-bottom: var(--spacing-md);
    }
    
    .hero-subtitle {
        font-size: 0.9375rem;
        margin-bottom: var(--spacing-xl);
        padding: 0 var(--spacing-sm);
    }
    
    .hero-stats {
        gap: var(--spacing-xl);
        margin-bottom: var(--spacing-xl);
    }
    
    .stat-item {
        min-width: 80px;
    }
    
    .stat-number {
        font-size: clamp(1.5rem, 6vw, 2rem);
    }
    
    .stat-label {
        font-size: 0.75rem;
    }
    
    .stat-divider {
        display: none;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-md);
    }
    
    .hero-cta .btn {
        width: 100%;
        max-width: 280px;
        padding: 0.75rem 1.5rem;
    }
    
    .hero-scroll {
        bottom: 1.5rem;
    }
    
    /* Section Headers */
    .section-header {
        margin-bottom: var(--spacing-2xl);
    }
    
    .section-tag {
        font-size: 0.75rem;
    }
    
    .section-title {
        font-size: clamp(1.5rem, 6vw, 2rem);
    }
    
    .section-title br {
        display: none;
    }
    
    .section-desc {
        font-size: 1rem;
        padding: 0 var(--spacing-sm);
    }
    
    /* About Section */
    .about-features {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .about-image img {
        height: 300px;
    }
    
    .about-image-overlay {
        position: relative;
        bottom: auto;
        left: auto;
        margin-top: calc(-1 * var(--spacing-2xl));
        margin-left: var(--spacing-md);
        margin-right: var(--spacing-md);
        display: inline-flex;
        gap: var(--spacing-sm);
        align-items: center;
    }
    
    .overlay-number {
        font-size: 2rem;
    }
    
    /* Capability Cards */
    .capability-card {
        grid-template-columns: 1fr;
    }
    
    .capability-icon {
        height: 180px;
        min-height: 180px;
    }
    
    .capability-content {
        padding: var(--spacing-lg);
    }
    
    .capability-content h3 {
        font-size: 1.25rem;
    }
    
    /* Technology Section */
    .technology-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
    
    .tech-card {
        padding: var(--spacing-lg);
    }
    
    .tech-icon {
        width: 60px;
        height: 60px;
        margin-bottom: var(--spacing-md);
    }
    
    .tech-icon i {
        font-size: 1.5rem;
    }
    
    .tech-card h3 {
        font-size: 1rem;
    }
    
    .tech-card p {
        font-size: 0.875rem;
    }
    
    .technology-images {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .tech-image {
        height: 200px;
    }
    
    /* Products Section */
    .products-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .product-image {
        height: 200px;
    }
    
    .product-content {
        padding: var(--spacing-lg);
    }
    
    .product-content h3 {
        font-size: 1.125rem;
    }
    
    /* Quality Section */
    .quality-content .section-tag,
    .quality-content .section-title {
        text-align: center;
    }
    
    .quality-content > p {
        text-align: center;
    }
    
    .quality-item {
        flex-direction: column;
        text-align: center;
        align-items: center;
    }
    
    .quality-icon {
        width: 50px;
        height: 50px;
    }
    
    .quality-icon i {
        font-size: 1.25rem;
    }
    
    /* Industry Cards */
    .industry-card {
        grid-template-columns: 1fr;
    }
    
    .industry-image {
        height: 180px;
    }
    
    .industry-content {
        padding: var(--spacing-lg);
    }
    
    .industry-content h3 {
        font-size: 1.25rem;
    }
    
    /* CTA Form */
    .cta-form-wrapper {
        padding: var(--spacing-xl);
    }
    
    .form-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .form-header h3 {
        font-size: 1.25rem;
    }
    
    /* Footer */
    .footer {
        padding: var(--spacing-3xl) 0 var(--spacing-lg);
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        text-align: center;
    }
    
    .footer-brand {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .footer-social {
        justify-content: center;
    }
    
    .footer-links h4,
    .footer-contact h4 {
        font-size: 0.9375rem;
    }
    
    .footer-contact li {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .footer-bottom-links {
        justify-content: center;
        flex-wrap: wrap;
        gap: var(--spacing-md);
    }
}

/* ============================================
   Responsive Design - Mobile Large (576px)
   ============================================ */
@media (max-width: 576px) {
    :root {
        --container-padding: 1rem;
    }
    
    .section {
        padding: var(--spacing-xl) 0;
    }
    
    /* Buttons */
    .btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.9375rem;
    }
    
    /* Hero */
    .hero-content {
        padding: var(--spacing-2xl) 0 var(--spacing-3xl);
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .stat-item {
        display: flex;
        align-items: center;
        gap: var(--spacing-sm);
        text-align: left;
    }
    
    .stat-number {
        font-size: 1.5rem;
        margin-bottom: 0;
    }
    
    .stat-label {
        font-size: 0.8125rem;
    }
    
    /* Technology Grid */
    .technology-grid {
        grid-template-columns: 1fr;
    }
    
    .tech-card {
        display: flex;
        align-items: center;
        text-align: left;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
    }
    
    .tech-icon {
        margin: 0;
        flex-shrink: 0;
    }
    
    .tech-card h3 {
        margin-bottom: var(--spacing-xs);
    }
    
    /* About */
    .about-lead {
        font-size: 1.0625rem;
    }
    
    .about-image img {
        height: 250px;
    }
    
    /* CTA */
    .cta-form-wrapper {
        padding: var(--spacing-lg);
        margin: 0;
        border-radius: var(--radius-lg);
    }
    
    .cta-content h2 {
        font-size: 1.5rem;
    }
    
    .cta-content p {
        font-size: 1rem;
    }
    
    /* Back to Top */
    .back-to-top {
        bottom: 1rem;
        right: 1rem;
        width: 44px;
        height: 44px;
    }
}

/* ============================================
   Responsive Design - Mobile Small (400px)
   ============================================ */
@media (max-width: 400px) {
    :root {
        --container-padding: 0.75rem;
    }
    
    .hero-title {
        font-size: 1.5rem;
    }
    
    .hero-badge {
        font-size: 0.6875rem;
        padding: 0.35rem 0.7rem;
    }
    
    .hero-badge i {
        font-size: 0.875rem;
    }
    
    .hero-cta .btn {
        max-width: 100%;
        font-size: 0.875rem;
    }
    
    .section-title {
        font-size: 1.25rem;
    }
    
    .section-desc {
        font-size: 0.9375rem;
    }
    
    .about-image img,
    .quality-image img {
        height: 220px;
    }
    
    .capability-icon {
        height: 150px;
        min-height: 150px;
    }
    
    .capability-content h3 {
        font-size: 1.125rem;
    }
    
    .product-image {
        height: 180px;
    }
    
    .industry-image {
        height: 150px;
    }
    
    .cta-form-wrapper {
        padding: var(--spacing-md);
    }
    
    .form-group input,
    .form-group textarea {
        padding: 0.75rem;
        font-size: 0.9375rem;
    }
    
    .footer-contact li {
        font-size: 0.875rem;
        text-align: center;
    }
}

/* ============================================
   Responsive Design - Height Considerations
   ============================================ */
@media (max-height: 700px) and (min-width: 769px) {
    .hero {
        min-height: auto;
        padding: 120px 0 60px;
    }
    
    .hero-content {
        padding: var(--spacing-xl) 0;
    }
    
    .hero-stats {
        margin-bottom: var(--spacing-lg);
    }
}

/* ============================================
   Landscape Mobile Orientation
   ============================================ */
@media (max-height: 500px) and (orientation: landscape) {
    .hero {
        min-height: auto;
        padding: 100px 0 40px;
    }
    
    .hero-content {
        padding: var(--spacing-md) 0;
    }
    
    .hero-badge {
        margin-bottom: var(--spacing-sm);
    }
    
    .hero-stats {
        flex-direction: row;
        gap: var(--spacing-xl);
        margin-bottom: var(--spacing-md);
    }
    
    .stat-item {
        flex-direction: column;
        text-align: center;
    }
    
    .stat-number {
        margin-bottom: var(--spacing-xs);
    }
    
    .hero-cta {
        flex-direction: row;
        gap: var(--spacing-md);
    }
    
    .hero-cta .btn {
        width: auto;
        max-width: none;
    }
    
    .hero-scroll {
        display: none;
    }
    
    .nav-menu {
        height: 100vh;
        height: 100dvh;
        padding-top: 4rem;
    }
}

/* ============================================
   Touch Device Optimizations
   ============================================ */
@media (hover: none) and (pointer: coarse) {
    .btn:hover {
        transform: none;
    }
    
    .capability-card:hover,
    .tech-card:hover,
    .product-card:hover,
    .industry-card:hover {
        transform: none;
    }
    
    .nav-link::after {
        display: none;
    }
    
    /* Larger touch targets */
    .nav-link {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .footer-social a {
        width: 48px;
        height: 48px;
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .header,
    .hero-scroll,
    .back-to-top,
    .nav-toggle {
        display: none !important;
    }
    
    .hero {
        min-height: auto;
        padding: 2rem 0;
    }
    
    .section {
        padding: 1.5rem 0;
        page-break-inside: avoid;
    }
    
    body {
        font-size: 12pt;
        color: #000;
    }
}

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

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

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: all 0.6s ease-out;
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: all 0.6s ease-out;
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* Stagger animation for grid items */
.stagger-item {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s ease-out;
}

.stagger-item.visible {
    opacity: 1;
    transform: translateY(0);
}

.stagger-item:nth-child(1) { transition-delay: 0.1s; }
.stagger-item:nth-child(2) { transition-delay: 0.2s; }
.stagger-item:nth-child(3) { transition-delay: 0.3s; }
.stagger-item:nth-child(4) { transition-delay: 0.4s; }

/* ============================================
   Mobile Device Specific Fixes
   ============================================ */

/* Prevent horizontal overflow on all devices */
*,
*::before,
*::after {
    max-width: 100%;
}

/* Fix for iOS Safari rubber banding */
@supports (-webkit-touch-callout: none) {
    html, body {
        overflow-x: hidden;
        -webkit-overflow-scrolling: touch;
    }
    
    .hero {
        min-height: -webkit-fill-available;
    }
}

/* Fix input zoom on iOS */
@media screen and (max-width: 768px) {
    input[type="text"],
    input[type="email"],
    input[type="tel"],
    input[type="number"],
    textarea,
    select {
        font-size: 16px !important;
    }
}

/* Ensure images don't overflow */
img,
video,
iframe,
embed,
object {
    max-width: 100%;
    height: auto;
}

/* Force word wrap for long text */
p, h1, h2, h3, h4, h5, h6, li, span, a {
    overflow-wrap: break-word;
    word-wrap: break-word;
    -ms-word-break: break-all;
    word-break: break-word;
    -ms-hyphens: auto;
    -moz-hyphens: auto;
    -webkit-hyphens: auto;
    hyphens: auto;
}

/* Fix for table overflow */
table {
    max-width: 100%;
    overflow-x: auto;
    display: block;
}

/* Safe area insets for notched devices */
@supports (padding: max(0px)) {
    .header {
        padding-left: max(var(--container-padding), env(safe-area-inset-left));
        padding-right: max(var(--container-padding), env(safe-area-inset-right));
    }
    
    .footer {
        padding-bottom: max(var(--spacing-xl), env(safe-area-inset-bottom));
    }
    
    .back-to-top {
        right: max(1rem, env(safe-area-inset-right));
        bottom: max(1rem, env(safe-area-inset-bottom));
    }
}