:root {
    --bg-color: #f7f9fc;
    --text-color: #2d3748;
    --card-bg: #ffffff;
    --primary-color: #4299e1;
    --primary-hover: #3182ce;
    --border-color: #e2e8f0;
    --text-muted: #718096;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1a202c;
        --text-color: #f7fafc;
        --card-bg: #2d3748;
        --primary-color: #63b3ed;
        --primary-hover: #4299e1;
        --border-color: #4a5568;
        --text-muted: #a0aec0;
    }
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 60px;
}

h1 {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

h1 a {
    text-decoration: none;
    color: var(--text-color);
}

h2 {
    font-size: 2rem;
    margin-bottom: 24px;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.back-link {
    text-decoration: none;
    color: var(--text-color);
    transition: color 0.2s;
}

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

.lang-switch {
    display: flex;
    gap: 16px;
    background: var(--card-bg);
    padding: 8px 16px;
    border-radius: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    border: 1px solid var(--border-color);
}

.lang-switch a {
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 600;
    transition: color 0.2s;
}

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

.lang-switch a.active {
    color: var(--primary-color);
}

.main-nav ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.nav-card {
    display: flex;
    flex-direction: column;
    padding: 24px;
    background: var(--card-bg);
    border-radius: 12px;
    text-decoration: none;
    color: var(--text-color);
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    border: 1px solid var(--border-color);
    transition: transform 0.2s, box-shadow 0.2s;
}

.nav-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px rgba(0,0,0,0.1);
    border-color: var(--primary-color);
}

.nav-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.nav-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.content {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    border: 1px solid var(--border-color);
}

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

.service-list li + li {
    margin-top: 16px;
}

.service-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: var(--bg-color);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.service-item h3 {
    font-size: 1.1rem;
    font-weight: 600;
}

.service-main {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.service-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.service-links a {
    color: var(--primary-color);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
}

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

.contact-box {
    text-align: center;
    padding: 20px 0;
}

.contact-box p {
    margin-bottom: 24px;
    color: var(--text-muted);
}

.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.2s;
}

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

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

.email-text {
    margin-top: 24px;
    font-family: monospace;
    font-size: 1.1rem;
    color: var(--text-color);
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 600px) {
    .service-item {
        align-items: flex-start;
        flex-direction: column;
    }
}