/* ===== CSS Variables ===== */
:root {
    --color-primary: #FF4F00;
    --color-primary-dark: #E64500;
    --color-secondary: #0A2540;
    --color-secondary-light: #1A3A5F;
    --color-background: #FFFFFF;
    --color-surface: #F8F9FA;
    --color-text: #1F2937;
    --color-text-muted: #6B7280;
    --color-border: #E5E7EB;
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
}

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

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

ul {
    list-style: none;
}

/* ===== Container ===== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(10, 37, 64, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: white;
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-icon {
    width: 32px;
    height: 32px;
    stroke: var(--color-primary);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: white;
    transition: all 0.3s ease;
}

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

.nav-link {
    color: white;
    font-weight: 500;
    transition: color 0.3s ease;
}

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

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
    cursor: pointer;
    border: 2px solid transparent;
    text-align: center;
}

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

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

.btn-secondary {
    background-color: white;
    color: var(--color-secondary);
    border-color: white;
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.9);
}

.btn-outline {
    background-color: transparent;
    color: white;
    border-color: white;
}

.btn-outline:hover {
    background-color: white;
    color: var(--color-secondary);
}

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

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-icon {
    width: 20px;
    height: 20px;
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    overflow: hidden;
    margin-top: 70px;
}

.hero-background {
    position: absolute;
    inset: 0;
    z-index: -1;
}

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

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(10, 37, 64, 0.95) 0%, rgba(10, 37, 64, 0.7) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: var(--spacing-3xl) 0;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.5rem);
    line-height: 1.5;
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
    color: rgba(255, 255, 255, 0.9);
}

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

/* ===== Section Styles ===== */
.section {
    padding: var(--spacing-3xl) 0;
}

.section-light {
    background-color: var(--color-surface);
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
}

.section-description {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
}

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

.max-w-3xl {
    max-width: 48rem;
}

.mx-auto {
    margin-left: auto;
    margin-right: auto;
}

/* ===== Grid System ===== */
.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* ===== Cards ===== */
.card {
    background-color: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

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

.card-icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--spacing-md);
}

.card-icon svg {
    width: 100%;
    height: 100%;
    stroke: var(--color-primary);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-xs);
}

.card-text {
    color: var(--color-text-muted);
}

/* ===== Service Cards ===== */
.service-card {
    background-color: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

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

.service-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.service-content {
    padding: var(--spacing-lg);
}

.service-icon {
    width: 56px;
    height: 56px;
    margin-bottom: var(--spacing-md);
}

.service-icon svg {
    width: 100%;
    height: 100%;
    stroke: var(--color-primary);
}

.service-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
}

.service-description {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.service-features {
    list-style: none;
}

.service-features li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.service-features li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

/* ===== Stats ===== */
.stats-grid {
    margin-bottom: var(--spacing-2xl);
}

.stat-card {
    background-color: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    box-shadow: var(--shadow-md);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-xs);
}

.stat-description {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* ===== Case Study ===== */
.case-study {
    background-color: var(--color-secondary);
    color: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    margin-top: var(--spacing-2xl);
}

.case-study-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.case-study-subtitle {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-xl);
}

.case-study-stats {
    margin-top: var(--spacing-xl);
}

.case-study-stat {
    text-align: center;
}

.case-study-stat .stat-number {
    color: var(--color-primary);
}

.case-study-stat .stat-label {
    color: white;
}

.case-study-stat .stat-description {
    color: rgba(255, 255, 255, 0.7);
}

/* ===== About Section ===== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.about-text {
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.about-subtitle {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-secondary);
    margin: var(--spacing-lg) 0 var(--spacing-md);
}

.about-features {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.about-features li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
    line-height: 1.6;
}

.about-features li:before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

.about-image img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

/* ===== CTA Section ===== */
.cta-section {
    background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-secondary-light) 100%);
    color: white;
}

.cta-title {
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.cta-subtitle {
    font-size: 1.25rem;
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
    color: rgba(255, 255, 255, 0.9);
}

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

/* ===== Footer ===== */
.footer {
    background-color: var(--color-secondary);
    color: white;
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 700;
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
}

.footer-tagline {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-sm);
}

.footer-description {
    color: rgba(255, 255, 255, 0.8);
}

.footer-heading {
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    transition: color 0.3s ease;
}

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

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background-color: var(--color-secondary);
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .section {
        padding: var(--spacing-2xl) 0;
    }
    
    .btn-lg {
        width: 100%;
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
}