/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
    /* Color Palette */
    --color-primary: #0A2540;
    --color-accent: #4F46E5;
    --color-neutral: #F8FAFC;
    --color-text: #111827;
    --color-text-light: #6B7280;
    --color-white: #FFFFFF;
    --color-border: #E5E7EB;
    --color-hover: #3730A3;
    --color-success: #10B981;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    
    /* 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);
    
    /* Transitions */
    --transition: all 0.3s ease;
    
    /* Container */
    --container-max-width: 1200px;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    color: var(--color-text);
    line-height: 1.6;
    background-color: var(--color-white);
}

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

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

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

.section-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: var(--transition);
    text-align: center;
}

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

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

.btn-secondary {
    background-color: transparent;
    color: var(--color-accent);
    border: 2px solid var(--color-accent);
}

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

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

/* ============================================
   HEADER & NAVIGATION
   ============================================ */
.header {
    background-color: var(--color-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-md);
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.5px;
}

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

.nav-link {
    color: var(--color-text);
    font-weight: 500;
}

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

.nav-cta-item {
    margin-left: var(--spacing-sm);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: var(--spacing-xs);
}

.hamburger-line {
    width: 24px;
    height: 3px;
    background-color: var(--color-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    background: linear-gradient(135deg, var(--color-neutral) 0%, #E0E7FF 100%);
    padding: var(--spacing-3xl) 0;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-title {
    font-size: 3rem;
    line-height: 1.2;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
}

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

/* Abstract Illustration */
.abstract-illustration {
    position: relative;
    height: 400px;
}

.illustration-shape {
    position: absolute;
    border-radius: var(--radius-lg);
}

.shape-1 {
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, var(--color-accent), #818CF8);
    top: 0;
    right: 0;
    animation: float 6s ease-in-out infinite;
}

.shape-2 {
    width: 150px;
    height: 150px;
    background: linear-gradient(135deg, #06B6D4, #0EA5E9);
    bottom: 50px;
    left: 0;
    animation: float 8s ease-in-out infinite;
}

.shape-3 {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, #8B5CF6, #A78BFA);
    top: 100px;
    left: 100px;
    animation: float 7s ease-in-out infinite;
}

.shape-4 {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #EC4899, #F472B6);
    bottom: 100px;
    right: 100px;
    animation: float 5s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* ============================================
   SERVICES SECTION
   ============================================ */
.services {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-white);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.service-card {
    padding: var(--spacing-xl);
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-accent);
}

.service-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-neutral);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
    color: var(--color-accent);
}

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

.service-description {
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ============================================
   INDUSTRIES SECTION
   ============================================ */
.industries {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-neutral);
}

.industries-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: var(--spacing-xl);
}

.industry-card {
    padding: var(--spacing-xl);
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.industry-card:hover {
    box-shadow: var(--shadow-xl);
}

.industry-title {
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.industry-problem,
.industry-solution {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-light);
    line-height: 1.7;
}

.industry-problem strong,
.industry-solution strong {
    color: var(--color-text);
    display: block;
    margin-bottom: var(--spacing-xs);
}

/* ============================================
   PROCESS SECTION
   ============================================ */
.process {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-white);
}

.process-timeline {
    max-width: 800px;
    margin: 0 auto;
}

.process-step {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
    position: relative;
}

.process-step:not(:last-child)::after {
    content: '';
    position: absolute;
    left: 40px;
    top: 80px;
    width: 2px;
    height: calc(100% + var(--spacing-xl));
    background-color: var(--color-border);
}

.step-number {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-accent), var(--color-hover));
    color: var(--color-white);
    border-radius: 50%;
    font-size: 1.5rem;
    font-weight: 700;
    box-shadow: var(--shadow-md);
}

.step-title {
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.step-description {
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ============================================
   CASE STUDIES SECTION
   ============================================ */
.case-studies {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-neutral);
}

.case-studies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: var(--spacing-xl);
}

.case-study-card {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.case-study-header {
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-primary), #1E3A5F);
    color: var(--color-white);
}

.case-study-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--color-accent);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
}

.case-study-title {
    font-size: 1.5rem;
}

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

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

.case-study-section h4 {
    color: var(--color-accent);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-xs);
}

.case-study-section p {
    color: var(--color-text-light);
    line-height: 1.7;
}

.case-study-results {
    list-style: disc;
    margin-left: var(--spacing-md);
    color: var(--color-text-light);
}

.case-study-results li {
    margin-bottom: var(--spacing-xs);
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-white);
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-section {
    margin-bottom: var(--spacing-2xl);
}

.about-section h3 {
    font-size: 1.75rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.about-section p {
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.values-list {
    list-style: none;
}

.values-list li {
    padding: var(--spacing-md);
    background-color: var(--color-neutral);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    border-left: 4px solid var(--color-accent);
}

.values-list strong {
    color: var(--color-primary);
    display: block;
    margin-bottom: var(--spacing-xs);
}

/* ============================================
   TESTIMONIALS SECTION
   ============================================ */
.testimonials {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-neutral);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

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

.testimonial-rating {
    color: #FCD34D;
    margin-bottom: var(--spacing-md);
    font-size: 1.25rem;
}

.testimonial-text {
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    font-style: italic;
}

.testimonial-author {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.testimonial-author strong {
    color: var(--color-primary);
}

.testimonial-author span {
    color: var(--color-text-light);
    font-size: 0.875rem;
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-white);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

.contact-description {
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
}

.contact-details {
    margin-top: var(--spacing-xl);
}

.contact-detail {
    margin-bottom: var(--spacing-md);
}

.contact-detail strong {
    display: block;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.contact-detail a {
    color: var(--color-accent);
}

.contact-detail a:hover {
    text-decoration: underline;
}

/* Contact Form */
.contact-form {
    background-color: var(--color-neutral);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.error-message {
    display: block;
    color: #EF4444;
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
    min-height: 1.25rem;
}

.form-success {
    display: none;
    padding: var(--spacing-md);
    background-color: #D1FAE5;
    color: #065F46;
    border-radius: var(--radius-md);
    margin-top: var(--spacing-md);
}

.form-success.show {
    display: block;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

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

.footer-logo {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.footer-about p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
}

.footer-links h4,
.footer-social h4 {
    margin-bottom: var(--spacing-md);
}

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

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

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

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

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

.social-link:hover {
    background-color: var(--color-accent);
    transform: translateY(-3px);
}

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

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

/* Tablet */
@media (max-width: 992px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .abstract-illustration {
        height: 300px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .services-grid,
    .industries-grid,
    .case-studies-grid,
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
}

/* Mobile */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: var(--color-white);
        flex-direction: column;
        align-items: flex-start;
        padding: var(--spacing-xl);
        box-shadow: var(--shadow-lg);
        transition: left 0.3s ease;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        width: 100%;
        margin-bottom: var(--spacing-md);
    }
    
    .nav-cta-item {
        margin-left: 0;
        width: 100%;
    }
    
    .nav-cta-item .btn {
        width: 100%;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .hero-cta .btn {
        width: 100%;
    }
    
    .abstract-illustration {
        height: 250px;
    }
    
    .process-step {
        grid-template-columns: 60px 1fr;
        gap: var(--spacing-md);
    }
    
    .process-step:not(:last-child)::after {
        left: 30px;
    }
    
    .step-number {
        width: 60px;
        height: 60px;
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .service-card,
    .industry-card,
    .testimonial-card {
        padding: var(--spacing-md);
    }
    
    .case-study-header,
    .case-study-content {
        padding: var(--spacing-md);
    }
}