/* ============================================
   OPUS EUROPE - PREMIUM DESIGN SYSTEM
   Enterprise-grade CSS Architecture
   ============================================ */

/* CSS Variables - Design Tokens */
:root {
    /* Colors */
    --primary: #0071e3;
    --primary-dark: #005bb5;
    --primary-light: #409cff;
    --secondary: #667eea;
    --accent: #764ba2;
    
    /* Neutrals */
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --text-tertiary: #a1a1a6;
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f7;
    --bg-tertiary: #fbfbfd;
    --border: #d2d2d7;
    --border-light: #e5e5e7;
    
    /* Semantic Colors */
    --success: #34c759;
    --warning: #ff9500;
    --error: #ff3b30;
    --info: #007aff;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 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);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    --z-toast: 1080;
}

/* Dark Mode */
[data-theme="dark"] {
    --text-primary: #f5f5f7;
    --text-secondary: #a1a1a6;
    --bg-primary: #1d1d1f;
    --bg-secondary: #2d2d2f;
    --bg-tertiary: #1a1a1c;
    --border: #48484a;
    --border-light: #3a3a3c;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
    color: var(--primary-dark);
}

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

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

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    z-index: var(--z-fixed);
    transition: all var(--transition-base);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
}

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

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

.nav-link {
    color: var(--text-primary);
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

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

.nav-auth {
    display: flex;
    gap: var(--space-md);
}

.lang-switcher {
    position: relative;
}

.lang-btn {
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-full);
    border: 1px solid var(--border);
    background: var(--bg-primary);
    font-size: var(--font-size-lg);
    transition: all var(--transition-fast);
}

.lang-btn:hover {
    border-color: var(--primary);
    transform: scale(1.05);
}

.lang-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: var(--space-sm);
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    min-width: 180px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base);
}

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

.lang-option {
    display: block;
    width: 100%;
    padding: var(--space-md);
    text-align: left;
    font-size: var(--font-size-sm);
    transition: background var(--transition-fast);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: var(--space-sm);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-fast);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
    cursor: pointer;
    border: 2px solid transparent;
    white-space: nowrap;
}

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

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

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-color: var(--border);
}

.btn-secondary:hover {
    background: var(--border-light);
    transform: translateY(-2px);
}

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

.btn-ghost:hover {
    background: rgba(0, 113, 227, 0.1);
}

.btn-lg {
    padding: var(--space-lg) var(--space-2xl);
    font-size: var(--font-size-lg);
}

.btn-block {
    width: 100%;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    padding: calc(80px + var(--space-4xl)) 0 var(--space-4xl);
    background: linear-gradient(180deg, var(--bg-tertiary) 0%, var(--bg-primary) 100%);
    overflow: hidden;
}

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

.hero-badge {
    display: inline-block;
    padding: var(--space-sm) var(--space-lg);
    background: rgba(0, 113, 227, 0.1);
    color: var(--primary);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--space-lg);
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-lg);
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    margin-bottom: var(--space-2xl);
    max-width: 600px;
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-3xl);
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: var(--space-2xl);
    flex-wrap: wrap;
}

.stat {
    text-align: left;
}

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.hero-image {
    position: relative;
    height: 500px;
}

.hero-visual {
    position: relative;
    width: 100%;
    height: 100%;
}

.floating-card {
    position: absolute;
    background: var(--bg-primary);
    padding: var(--space-lg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    animation: float 6s ease-in-out infinite;
}

.card-1 {
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.card-2 {
    top: 50%;
    right: 10%;
    animation-delay: 2s;
}

.card-3 {
    bottom: 20%;
    left: 20%;
    animation-delay: 4s;
}

.card-icon {
    font-size: var(--font-size-3xl);
}

.card-text {
    font-weight: 600;
    font-size: var(--font-size-lg);
}

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

/* ============================================
   SECTIONS
   ============================================ */
section {
    padding: var(--space-4xl) 0;
}

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

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--space-md);
    letter-spacing: -0.02em;
}

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

/* ============================================
   FEATURES
   ============================================ */
.features {
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
}

.feature-card {
    background: var(--bg-primary);
    padding: var(--space-2xl);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
    border: 1px solid var(--border-light);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary);
}

.feature-icon {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-lg);
}

.feature-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.feature-desc {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================
   VACANCIES
   ============================================ */
.filter-tabs {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
    flex-wrap: wrap;
}

.filter-tab {
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-full);
    border: 1px solid var(--border);
    background: var(--bg-primary);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.filter-tab:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.filter-tab.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.jobs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-xl);
}

.job-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 1px solid var(--border-light);
    transition: all var(--transition-base);
    cursor: pointer;
}

.job-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary);
}

.job-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: var(--bg-secondary);
}

.job-content {
    padding: var(--space-xl);
}

.job-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.job-salary {
    color: var(--success);
    font-weight: 600;
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-md);
}

.job-location {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

/* ============================================
   HOW IT WORKS
   ============================================ */
.how-it-works {
    background: var(--bg-secondary);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-xl);
}

.step-card {
    background: var(--bg-primary);
    padding: var(--space-2xl);
    border-radius: var(--radius-xl);
    text-align: center;
    position: relative;
    transition: all var(--transition-base);
}

.step-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin: 0 auto var(--space-lg);
}

.step-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.step-desc {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================
   LOTTERY
   ============================================ */
.lottery {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--accent) 100%);
    color: white;
}

.lottery-card {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
}

.lottery-badge {
    display: inline-block;
    padding: var(--space-sm) var(--space-lg);
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    font-weight: 600;
    margin-bottom: var(--space-lg);
}

.lottery-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--space-lg);
}

.lottery-desc {
    font-size: var(--font-size-lg);
    opacity: 0.95;
    margin-bottom: var(--space-2xl);
}

.lottery-stats {
    display: flex;
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
    flex-wrap: wrap;
}

.lottery-stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    line-height: 1;
    margin-bottom: var(--space-xs);
}

.lottery-stat-label {
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

.lottery-cta {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

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

.lottery-cta .btn-primary:hover {
    background: var(--bg-secondary);
}

.lottery-cta .btn-ghost {
    color: white;
    border-color: white;
}

.lottery-cta .btn-ghost:hover {
    background: rgba(255, 255, 255, 0.1);
}

.lottery-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.trophy {
    font-size: 200px;
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ============================================
   FAQ
   ============================================ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border-light);
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-xl) 0;
    font-size: var(--font-size-lg);
    font-weight: 600;
    text-align: left;
    transition: color var(--transition-fast);
}

.faq-question:hover {
    color: var(--primary);
}

.faq-icon {
    font-size: var(--font-size-2xl);
    transition: transform var(--transition-base);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

.faq-answer p {
    padding-bottom: var(--space-xl);
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================
   CONTACT
   ============================================ */
.contact-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    background: var(--bg-secondary);
    border-radius: var(--radius-2xl);
    padding: var(--space-3xl);
}

.contact-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.contact-desc {
    color: var(--text-secondary);
    margin-bottom: var(--space-2xl);
}

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

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

.contact-icon {
    font-size: var(--font-size-3xl);
}

.contact-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

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

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

.form-group label {
    font-weight: 600;
    font-size: var(--font-size-sm);
}

.form-group input,
.form-group textarea {
    padding: var(--space-lg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-family: inherit;
    transition: all var(--transition-fast);
    background: var(--bg-primary);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.1);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--bg-secondary);
    padding: var(--space-3xl) 0 var(--space-xl);
    border-top: 1px solid var(--border-light);
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--space-md);
}

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

.footer-tagline {
    color: var(--text-secondary);
    font-style: italic;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.footer-column h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--space-lg);
}

.footer-column a {
    display: block;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    font-size: var(--font-size-sm);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border-light);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */
.toast-container {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    max-width: 400px;
}

.toast {
    background: var(--bg-primary);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    animation: slideInRight 0.3s ease;
    border-left: 4px solid var(--primary);
}

.toast.success {
    border-left-color: var(--success);
}

.toast.error {
    border-left-color: var(--error);
}

.toast.warning {
    border-left-color: var(--warning);
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ============================================
   LOADING
   ============================================ */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
}

.loading-overlay.hidden {
    display: none;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
    }
    
    .hero-image {
        display: none;
    }
    
    .contact-card {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        flex-direction: column;
        padding: var(--space-xl);
        border-bottom: 1px solid var(--border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .lottery-card {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .container {
        padding: 0 var(--space-md);
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .jobs-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

*:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

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