/* ==========================================
   Global Variables & Reset
   ========================================== */

:root {
    /* Colors */
    --primary-color: #000000;
    --secondary-color: #0066FF;
    --accent-color: #00FF88;
    --accent-orange: #FF6B35;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-light: #999999;
    --bg-white: #FFFFFF;
    --bg-light: #F8F9FA;
    --bg-dark: #000000;
    --border-color: #E5E5E5;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', sans-serif;
    --font-size-base: 16px;
    --font-size-small: 14px;
    --font-size-large: 18px;
    --font-size-h1: 56px;
    --font-size-h2: 42px;
    --font-size-h3: 32px;
    --font-size-h4: 24px;
    --line-height: 1.6;
    --letter-spacing: -0.01em;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 48px;
    --spacing-xl: 80px;
    --spacing-xxl: 120px;
    
    /* Layout */
    --container-width: 1200px;
    --container-padding: 24px;
    --border-radius: 12px;
    --border-radius-sm: 6px;
    --border-radius-lg: 16px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    letter-spacing: var(--letter-spacing);
    color: var(--text-primary);
    background-color: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
    list-style: none;
}

/* ==========================================
   Utility Classes
   ========================================== */

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section {
    padding: var(--spacing-xl) 0;
}

.section-lg {
    padding: var(--spacing-xxl) 0;
}

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

.text-light {
    color: var(--text-secondary);
}

/* Typography */
.section-title {
    font-size: var(--font-size-h2);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.section-subtitle {
    font-size: var(--font-size-large);
    color: var(--text-secondary);
    line-height: 1.8;
    max-width: 700px;
    margin: 0 auto var(--spacing-md) auto;
}

h1 {
    font-size: var(--font-size-h1);
    font-weight: 700;
    line-height: 1.2;
}

h2 {
    font-size: var(--font-size-h2);
    font-weight: 700;
    line-height: 1.3;
}

h3 {
    font-size: var(--font-size-h3);
    font-weight: 600;
    line-height: 1.4;
}

h4 {
    font-size: var(--font-size-h4);
    font-weight: 600;
    line-height: 1.5;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 14px 32px;
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--border-radius);
    border: none;
    cursor: pointer;
    transition: var(--transition-smooth);
    text-align: center;
}

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

.btn-primary:hover {
    background-color: #333333;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    background-color: #0052CC;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-accent:hover {
    background-color: #00DD77;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

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

.btn-large {
    padding: 18px 40px;
    font-size: var(--font-size-large);
}

/* Cards */
.card {
    background-color: var(--bg-white);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-smooth);
}

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

.card-title {
    font-size: var(--font-size-h4);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.card-text {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* Grid System */
.grid {
    display: grid;
    gap: var(--spacing-lg);
    width: 100%;
    margin: 0 auto;
    padding: 0 var(--container-padding);
    box-sizing: border-box;
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
    max-width: 900px;
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
    max-width: 950px;
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
    max-width: 1200px;
}

@media (max-width: 1024px) {
    .grid-2,
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
        max-width: 700px;
    }
    
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
        max-width: 700px;
    }
}

/* Form Elements */
.form-group {
    margin-bottom: var(--spacing-md);
}

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

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 14px 16px;
    font-size: var(--font-size-base);
    font-family: var(--font-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    transition: var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

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

/* ==========================================
   Header & Navigation
   ========================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition-fast);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.nav-logo {
    font-size: var(--font-size-h4);
    font-weight: 700;
    color: var(--primary-color);
}

.nav-logo span {
    color: var(--accent-color);
}

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

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

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

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

.lang-switcher {
    position: relative;
    display: inline-block;
}

.lang-current {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    background-color: var(--bg-white);
    transition: var(--transition-fast);
    font-size: var(--font-size-small);
    font-weight: 500;
}

.lang-current:hover {
    border-color: var(--secondary-color);
}

.lang-current::after {
    content: '▼';
    font-size: 10px;
    transition: var(--transition-fast);
}

.lang-switcher.active .lang-current::after {
    transform: rotate(180deg);
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 4px);
    right: 0;
    min-width: 240px;
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition-fast);
    z-index: 100;
}

.lang-switcher.active .lang-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: var(--font-size-small);
    border-bottom: 1px solid var(--border-color);
}

.lang-option:last-child {
    border-bottom: none;
}

.lang-option:hover {
    background-color: var(--bg-light);
}

.lang-option.active {
    background-color: var(--accent-color);
    color: var(--primary-color);
    font-weight: 600;
}

.lang-option.active::after {
    content: '✓';
    font-weight: bold;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition-fast);
}

/* ==========================================
   Hero Section
   ========================================== */

.hero {
    padding-top: calc(80px + var(--spacing-xxl));
    padding-bottom: var(--spacing-xxl);
    background: linear-gradient(135deg, #000000 0%, #1a1a1a 100%);
    color: var(--bg-white);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(0, 255, 136, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(0, 102, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.hero h1 {
    margin-bottom: var(--spacing-md);
    color: var(--bg-white);
}

.hero-subtitle {
    font-size: var(--font-size-large);
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

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

/* ==========================================
   Platform Section
   ========================================== */

.platform-section {
    background: linear-gradient(to bottom, var(--bg-white), var(--bg-light));
}

.platform-logos {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    max-width: 1100px;
    margin-left: auto;
    margin-right: auto;
}

.platform-card {
    background-color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-smooth);
    border: 1px solid var(--border-color);
}

.platform-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
    border-color: var(--accent-color);
}

.platform-logo {
    font-size: var(--font-size-h2);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.platform-stats {
    font-size: var(--font-size-small);
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

.platform-badge {
    display: inline-block;
    margin-top: var(--spacing-sm);
    padding: 4px 12px;
    background-color: var(--accent-color);
    color: var(--primary-color);
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

/* ==========================================
   Features Section
   ========================================== */

.feature-card {
    text-align: center;
    padding: var(--spacing-lg);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--accent-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    font-size: 36px;
}

.feature-title {
    font-size: var(--font-size-h4);
    margin-bottom: var(--spacing-sm);
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ==========================================
   Services Section
   ========================================== */

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(280px, 350px));
    gap: var(--spacing-lg);
    justify-content: center;
    align-items: stretch;
    width: 100%;
    padding: 0 var(--container-padding);
    box-sizing: border-box;
}

@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
        max-width: 700px;
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    .services-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }
}

.service-card {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 0;
    overflow: hidden;
}

.service-header {
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), #333333);
    color: var(--bg-white);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    min-height: 80px;
    display: flex;
    align-items: center;
}

.service-header h3 {
    margin: 0;
}

.service-body {
    padding: var(--spacing-lg);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.service-body .card-text {
    flex: 0 0 auto;
}

.service-body .service-stats {
    flex: 0 0 auto;
    margin-top: auto;
}

.service-body .btn {
    flex: 0 0 auto;
    margin-top: var(--spacing-md);
}

.card-text {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.service-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-sm);
    background-color: var(--bg-light);
    border-radius: var(--border-radius-sm);
}

.stat-number {
    font-size: var(--font-size-h3);
    font-weight: 700;
    color: var(--accent-color);
}

.stat-label {
    font-size: var(--font-size-small);
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

/* ==========================================
   Careers Section
   ========================================== */

.job-card {
    border-left: 4px solid var(--accent-color);
    padding: var(--spacing-lg);
}

.job-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: var(--spacing-md);
}

.job-title {
    font-size: var(--font-size-h4);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.job-meta {
    display: flex;
    gap: var(--spacing-md);
    color: var(--text-secondary);
    font-size: var(--font-size-small);
    margin-bottom: var(--spacing-md);
}

.job-meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.job-description {
    margin-bottom: var(--spacing-md);
}

.job-requirements,
.job-benefits {
    margin-bottom: var(--spacing-md);
}

.job-requirements h4,
.job-benefits h4 {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-xs);
}

.job-requirements ul,
.job-benefits ul {
    list-style: disc;
    padding-left: var(--spacing-md);
}

.job-requirements li,
.job-benefits li {
    margin-bottom: 6px;
    color: var(--text-secondary);
}

/* ==========================================
   Footer
   ========================================== */

.footer {
    background-color: var(--bg-dark);
    color: var(--bg-white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
    margin-bottom: var(--spacing-md);
    color: var(--bg-white);
}

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

.footer-link {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
}

/* ==========================================
   Responsive Design
   ========================================== */

@media (max-width: 1024px) {
    :root {
        --font-size-h1: 42px;
        --font-size-h2: 32px;
        --font-size-h3: 24px;
        --spacing-xl: 60px;
        --spacing-xxl: 80px;
    }
    
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-h1: 32px;
        --font-size-h2: 28px;
        --font-size-h3: 20px;
        --font-size-h4: 18px;
        --spacing-lg: 32px;
        --spacing-xl: 48px;
        --spacing-xxl: 60px;
        --container-padding: 16px;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: var(--bg-white);
        flex-direction: column;
        justify-content: flex-start;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-lg);
        transition: var(--transition-smooth);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    /* Language switcher in mobile menu */
    .lang-switcher {
        width: 100%;
        margin-top: 20px;
    }
    
    .lang-current {
        width: 100%;
        justify-content: space-between;
    }
    
    .lang-dropdown {
        left: 0;
        right: 0;
        width: 100%;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn,
    .btn-large {
        width: 100%;
        max-width: 300px;
    }
    
    .platform-logos {
        gap: var(--spacing-md);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .service-stats {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-h1: 28px;
        --font-size-h2: 24px;
    }
}

/* ==========================================
   Animations
   ========================================== */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.pulse {
    animation: pulse 2s ease-in-out infinite;
}