:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #06b6d4;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #ffffff;
    --bg-light: #f8fafc;
    --border-color: #e5e7eb;
    --header-bg: rgba(255, 255, 255, 0.95);
    --card-bg: #ffffff;
    --shadow-light: rgba(0, 0, 0, 0.05);
    --shadow-hover: rgba(0, 0, 0, 0.1);
    --footer-bg: #1f2937;
    --footer-text: #ffffff;
}

[data-theme="dark"] {
    --primary-color: #3b82f6;
    --secondary-color: #2563eb;
    --accent-color: #06b6d4;
    --text-color: #e5e7eb;
    --text-light: #9ca3af;
    --bg-color: #111827;
    --bg-light: #1f2937;
    --border-color: #374151;
    --header-bg: rgba(17, 24, 39, 0.95);
    --card-bg: #1f2937;
    --shadow-light: rgba(0, 0, 0, 0.2);
    --shadow-hover: rgba(0, 0, 0, 0.3);
    --footer-bg: #0f172a;
    --footer-text: #e5e7eb;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --primary-color: #3b82f6;
        --secondary-color: #2563eb;
        --accent-color: #06b6d4;
        --text-color: #e5e7eb;
        --text-light: #9ca3af;
        --bg-color: #111827;
        --bg-light: #1f2937;
        --border-color: #374151;
        --header-bg: rgba(17, 24, 39, 0.95);
        --card-bg: #1f2937;
        --shadow-light: rgba(0, 0, 0, 0.2);
        --shadow-hover: rgba(0, 0, 0, 0.3);
        --footer-bg: #0f172a;
        --footer-text: #e5e7eb;
    }
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: var(--header-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: inline;
}

.logo span {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-left: 0.25rem;
}

.nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s ease;
}

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

/* Main */
.main {
    margin-top: 80px;
    min-height: calc(100vh - 80px);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.cta-button {
    display: inline-block;
    background: var(--accent-color);
    color: white;
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

/* Sections */
.section {
    padding: 4rem 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--primary-color);
}

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

/* Services Grid */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.service-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px var(--shadow-light);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px var(--shadow-hover);
}

.service-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.service-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.about-text {
    font-size: 1.1rem;
    line-height: 1.8;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.stat-item {
    text-align: center;
    padding: 1.5rem;
    background: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow-light);
    transition: background-color 0.3s ease;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Contact Section */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.contact-info {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px var(--shadow-light);
    transition: background-color 0.3s ease;
}

.contact-item {
    display: flex;
    align-items: center;
    margin-bottom: 1.5rem;
}

.contact-icon {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-right: 1rem;
}

.contact-form {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px var(--shadow-light);
    transition: background-color 0.3s ease;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: border-color 0.3s ease, background-color 0.3s ease, color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

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

.submit-btn {
    background: var(--primary-color);
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

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

/* Footer */
.footer {
    background: var(--footer-bg);
    color: var(--footer-text);
    padding: 3rem 0 1rem;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-info h3 {
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav ul {
        gap: 1rem;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .about-content,
    .contact-content,
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 2rem 0;
    }
    
    .section {
        padding: 2rem 0;
    }
    
    .service-card,
    .contact-info,
    .contact-form {
        padding: 1.5rem;
    }
}

/* Theme Toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem;
    transition: all 0.3s ease;
}

.theme-toggle-btn {
    background: none;
    border: none;
    padding: 0.5rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-light);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 2rem;
}

.theme-toggle-btn:hover {
    color: var(--text-color);
    background: var(--bg-light);
}

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

.theme-toggle-divider {
    width: 1px;
    height: 1.5rem;
    background: var(--border-color);
    transition: background-color 0.3s ease;
}

/* Language Toggle */
.lang-toggle {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.25rem;
    transition: all 0.3s ease;
}

.lang-toggle-btn {
    background: none;
    border: none;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-light);
    transition: all 0.3s ease;
    text-transform: uppercase;
    min-width: 2rem;
}

.lang-toggle-btn:hover {
    color: var(--text-color);
    background: var(--bg-light);
}

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

@media (max-width: 768px) {
    .header-nav {
        gap: 1rem;
    }
    
    .theme-toggle {
        padding: 0.25rem;
    }
    
    .theme-toggle-btn {
        padding: 0.25rem;
        min-width: 1.5rem;
        font-size: 0.9rem;
    }
    
    .lang-toggle {
        padding: 0.2rem;
    }
    
    .lang-toggle-btn {
        padding: 0.2rem 0.4rem;
        font-size: 0.7rem;
        min-width: 1.5rem;
    }
}