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

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

/* CSS Custom Properties (Variables) */
:root {
    /* Colors - Light Theme */
    --color-primary: #2563EB;
    --color-secondary: #22D3EE;
    --color-accent: #6366F1;
    --color-background: #F8FAFC;
    --color-surface: #FFFFFF;
    --color-text-primary: #0F172A;
    --color-text-secondary: #64748B;
    --color-text-muted: #94A3B8;
    --color-border: #E2E8F0;
    --color-border-light: #F1F5F9;
    --color-success: #10B981;
    --color-error: #EF4444;
    --color-warning: #F59E0B;
    
    /* 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);
    
    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-display: 'Poppins', system-ui, -apple-system, sans-serif;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* Borders */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Layout */
    --container-max-width: 1200px;
    --navbar-height: 80px;
}

/* Dark Theme Variables */
[data-theme="dark"] {
    --color-background: #0F172A;
    --color-surface: #1E293B;
    --color-text-primary: #F8FAFC;
    --color-text-secondary: #CBD5E1;
    --color-text-muted: #64748B;
    --color-border: #334155;
    --color-border-light: #1E293B;
}

/* Base Typography */
body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-background);
    transition: color var(--transition-normal), background-color var(--transition-normal);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--space-4);
}

h1 { font-size: 3rem; font-weight: 700; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.875rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.125rem; }

p {
    margin-bottom: var(--space-4);
}

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

a:hover,
a:focus {
    color: var(--color-secondary);
    outline: none;
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--color-primary);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: var(--radius-md);
    z-index: 1000;
}

.skip-link:focus {
    top: 6px;
}

/* Layout Components */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding-left: var(--space-6);
    padding-right: var(--space-6);
}

@media (max-width: 768px) {
    .container {
        padding-left: var(--space-4);
        padding-right: var(--space-4);
    }
}

/* Navigation */
.navbar {
    position: sticky;
    top: 0;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    height: var(--navbar-height);
    z-index: 100;
    backdrop-filter: blur(10px);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-brand .logo {
    height: 40px;
    width: auto;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav-link {
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
    position: relative;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--color-primary);
    border-radius: var(--radius-full);
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.theme-btn,
.lang-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background-color: var(--color-surface);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-btn:hover,
.lang-btn:hover {
    color: var(--color-text-primary);
    border-color: var(--color-primary);
}

.theme-btn:focus,
.lang-btn:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.lang-btn {
    gap: var(--space-1);
    width: auto;
    padding: 0 var(--space-3);
    font-size: 0.875rem;
    font-weight: 500;
}

/* Theme Toggle Icons */
.theme-icon {
    width: 20px;
    height: 20px;
    transition: opacity var(--transition-fast);
}

[data-theme="light"] .sun-icon {
    display: block;
}

[data-theme="light"] .moon-icon {
    display: none;
}

[data-theme="dark"] .sun-icon {
    display: none;
}

[data-theme="dark"] .moon-icon {
    display: block;
}

/* Icon styling for components */
.icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.icon-sm {
    width: 16px;
    height: 16px;
}

.icon-lg {
    width: 32px;
    height: 32px;
}

.icon-xl {
    width: 48px;
    height: 48px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-family: var(--font-sans);
    font-weight: 500;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    line-height: 1;
    white-space: nowrap;
}

.btn:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Button Sizes */
.btn {
    padding: var(--space-3) var(--space-6);
    font-size: 0.875rem;
}

.btn-large {
    padding: var(--space-4) var(--space-8);
    font-size: 1rem;
}

/* Button Variants */
.btn-primary {
    background-color: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background-color: #1D4ED8;
    color: white;
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background-color: var(--color-surface);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* Hero Section */
.hero {
    padding: var(--space-24) 0;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: var(--space-6);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-10);
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    margin-bottom: var(--space-12);
    flex-wrap: wrap;
}

.hero-tagline {
    font-style: italic;
    color: var(--color-text-muted);
    font-size: 1.125rem;
}

@media (max-width: 768px) {
    .hero {
        padding: var(--space-16) 0;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
}

/* Service Pillars */
.pillars {
    padding: var(--space-24) 0;
    background-color: var(--color-surface);
}

.pillars-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--space-12);
}

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

.pillar-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-6);
    background-color: var(--color-background);
    border-radius: var(--radius-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
}

.pillar-title {
    font-size: 1.5rem;
    margin-bottom: var(--space-4);
}

.pillar-body {
    color: var(--color-text-secondary);
    font-size: 1.125rem;
    line-height: 1.7;
}

@media (max-width: 768px) {
    .pillars-grid {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }
}

/* Proof Points */
.proof-points {
    padding: var(--space-16) 0;
}

.proof-grid {
    display: flex;
    justify-content: center;
    gap: var(--space-12);
    flex-wrap: wrap;
}

.proof-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-weight: 500;
    color: var(--color-text-secondary);
}

.proof-icon {
    color: var(--color-secondary);
}

@media (max-width: 768px) {
    .proof-grid {
        flex-direction: column;
        gap: var(--space-6);
        align-items: center;
    }
}

/* Brand Story */
.brand-story {
    padding: var(--space-24) 0;
    background-color: var(--color-surface);
}

.brand-card {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
    padding: var(--space-12);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
}

.brand-title {
    font-size: 2rem;
    margin-bottom: var(--space-6);
    color: var(--color-primary);
}

.brand-body {
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--color-text-secondary);
}

/* Clients Section */
.clients {
    padding: var(--space-16) 0;
}

.clients-strip {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-12);
    flex-wrap: wrap;
}

.client-logo {
    opacity: 0.6;
    transition: opacity var(--transition-fast);
    color: var(--color-text-muted);
}

.client-logo:hover {
    opacity: 1;
}

@media (max-width: 768px) {
    .clients-strip {
        gap: var(--space-8);
    }
}

/* Page Header */
.page-header {
    padding: var(--space-20) 0 var(--space-16);
    text-align: center;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--space-6);
}

.page-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .page-header {
        padding: var(--space-16) 0 var(--space-12);
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .page-subtitle {
        font-size: 1.125rem;
    }
}

/* Contact Section */
.contact-section {
    padding-bottom: var(--space-24);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: start;
}

.contact-info h2 {
    font-size: 1.5rem;
    margin-bottom: var(--space-8);
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.contact-icon {
    width: 48px;
    height: 48px;
    background-color: var(--color-background);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    flex-shrink: 0;
}

.contact-text {
    display: flex;
    flex-direction: column;
}

.contact-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
    margin-bottom: var(--space-1);
}

.contact-value {
    font-weight: 500;
    color: var(--color-text-primary);
}

@media (max-width: 768px) {
    .contact-grid {
        grid-template-columns: 1fr;
        gap: var(--space-12);
    }
}

/* Forms */
.contact-form,
.careers-form {
    background-color: var(--color-surface);
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.form-group {
    margin-bottom: var(--space-6);
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--space-2);
    color: var(--color-text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-family: var(--font-sans);
    background-color: var(--color-background);
    color: var(--color-text-primary);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

.error-message {
    display: block;
    font-size: 0.875rem;
    color: var(--color-error);
    margin-top: var(--space-2);
    min-height: 1.25rem;
}

.form-group input:invalid:not(:focus):not(:placeholder-shown) {
    border-color: var(--color-error);
}

.form-group input:invalid:not(:focus):not(:placeholder-shown) + .error-message {
    display: block;
}

/* Careers Section */
.careers-section {
    padding-bottom: var(--space-24);
}

.careers-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: start;
}

.careers-info h2 {
    font-size: 1.5rem;
    margin-bottom: var(--space-8);
}

.requirements-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
    margin-bottom: var(--space-12);
}

.requirement-item {
    display: flex;
    gap: var(--space-4);
}

.requirement-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-success);
    flex-shrink: 0;
    margin-top: var(--space-1);
}

.requirement-text h3 {
    font-size: 1.125rem;
    margin-bottom: var(--space-2);
}

.requirement-text p {
    color: var(--color-text-secondary);
    margin-bottom: 0;
}

.careers-benefits {
    padding: var(--space-6);
    background-color: var(--color-background);
    border-radius: var(--radius-lg);
}

.careers-benefits h3 {
    font-size: 1.125rem;
    margin-bottom: var(--space-4);
}

.careers-benefits ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.careers-benefits li {
    position: relative;
    padding-left: var(--space-6);
    color: var(--color-text-secondary);
}

.careers-benefits li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-secondary);
    font-weight: bold;
}

@media (max-width: 768px) {
    .careers-grid {
        grid-template-columns: 1fr;
        gap: var(--space-12);
    }
}

/* Toast Notifications */
.toast {
    position: fixed;
    top: var(--space-6);
    right: var(--space-6);
    background-color: var(--color-success);
    color: white;
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    transform: translateX(100%);
    opacity: 0;
    transition: all var(--transition-normal);
    z-index: 1000;
    max-width: 400px;
}

.toast.show {
    transform: translateX(0);
    opacity: 1;
}

.toast-content {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.toast svg {
    flex-shrink: 0;
}

/* Footer */
.footer {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--space-12) 0;
    margin-top: var(--space-24);
}

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

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

.footer-links {
    display: flex;
    gap: var(--space-6);
}

.footer-links a {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

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

@media (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }
}

/* Mobile Navigation */
@media (max-width: 1024px) {
    .nav-menu {
        gap: var(--space-6);
    }
    
    .nav-controls {
        gap: var(--space-3);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--space-4);
    }
    
    .nav-controls {
        order: -1;
        gap: var(--space-2);
    }
    
    .nav-controls .btn {
        padding: var(--space-2) var(--space-4);
        font-size: 0.875rem;
    }
}

/* Utility Classes */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

/* Animation for smooth scrolling */
@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

/* Focus styles for better accessibility */
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .navbar,
    .footer,
    .toast {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .hero,
    .pillars,
    .brand-story,
    .contact-section,
    .careers-section {
        padding: var(--space-8) 0;
    }
}