:root {
    --bg-color: #ffffff;
    --text-color: #1a1a1a;
    --heading-color: #111111;
    --accent-color: #000000;
    --card-bg: #f5f5f7;
    --border-color: #e5e5e5;
    --nav-bg: rgba(255, 255, 255, 0.8);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #000000;
        --text-color: #e5e5e5;
        --heading-color: #ffffff;
        --accent-color: #ffffff;
        --card-bg: #1c1c1e;
        --border-color: #333333;
        --nav-bg: rgba(0, 0, 0, 0.8);
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    padding-top: 80px;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 15px 0;
}

.nav-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 700;
    color: var(--heading-color);
    text-decoration: none;
    font-size: 1.1rem;
    letter-spacing: -0.02em;
}

.lang-switch a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.9rem;
    opacity: 0.7;
    transition: opacity 0.2s;
    margin-left: 15px;
}

.lang-switch a:hover, .lang-switch a.active {
    opacity: 1;
    font-weight: 600;
}

h1, h2, h3 {
    color: var(--heading-color);
    letter-spacing: -0.02em;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5em;
    font-weight: 800;
}

h2 {
    font-size: 1.5rem;
    margin-top: 2em;
    margin-bottom: 1em;
    font-weight: 700;
}

h3 {
    font-size: 1.1rem;
    margin-top: 1.5em;
    font-weight: 600;
}

p {
    margin-bottom: 1.2em;
}

ul {
    margin-bottom: 1.2em;
    padding-left: 1.2em;
}

li {
    margin-bottom: 0.5em;
}

.card {
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 24px;
    margin: 24px 0;
    border: 1px solid var(--border-color);
}

.badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
    background-color: var(--text-color);
    color: var(--bg-color);
    margin-right: 8px;
    vertical-align: middle;
}

.last-updated {
    font-size: 0.9rem;
    opacity: 0.6;
    margin-bottom: 2rem;
}

/* Accordion for FAQ */
.faq-item {
    border-bottom: 1px solid var(--border-color);
    padding: 20px 0;
}

.faq-question {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--heading-color);
    cursor: pointer;
    display: block;
    margin-bottom: 0.5em;
}

.faq-answer {
    opacity: 0.9;
}

footer {
    text-align: center;
    padding: 40px 0;
    opacity: 0.5;
    font-size: 0.9rem;
    margin-top: 40px;
    border-top: 1px solid var(--border-color);
}