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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
    line-height: 1.6;
    color: #1a1c1e;
    background: linear-gradient(to bottom, #e8fbf4 0%, #f6f8f7 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    padding: 40px;
    margin-top: 20px;
    margin-bottom: 40px;
}

.header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 2px solid #edf1f3;
}

.header h1 {
    font-size: 36px;
    font-weight: 700;
    color: #111827;
    margin-bottom: 10px;
    letter-spacing: -0.72px;
}

.last-updated {
    font-size: 14px;
    color: #6c7278;
    font-weight: 500;
    margin-top: 10px;
}

.back-link {
    display: inline-block;
    color: #13eca4;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 20px;
    transition: opacity 0.2s;
}

.back-link:hover {
    opacity: 0.8;
}

.lang-switcher {
    display: inline-flex;
    gap: 0;
    margin-top: 16px;
    background: #f6f8f7;
    border-radius: 999px;
    padding: 4px;
    border: 1px solid #edf1f3;
}

.lang-switcher button {
    appearance: none;
    border: none;
    background: transparent;
    padding: 6px 18px;
    font-size: 13px;
    font-weight: 600;
    color: #6c7278;
    border-radius: 999px;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}

.lang-switcher button:hover {
    color: #111827;
}

.lang-switcher button.active {
    background: #13eca4;
    color: white;
}

[data-lang]:not(.lang-active) {
    display: none !important;
}

a[data-lang].lang-active.back-link {
    display: inline-block;
}

.content {
    line-height: 1.8;
}

.intro {
    font-size: 16px;
    color: #1a1c1e;
    margin-bottom: 30px;
    padding: 20px;
    background: #f6f8f7;
    border-left: 4px solid #13eca4;
    border-radius: 4px;
}

h2 {
    font-size: 28px;
    font-weight: 700;
    color: #111827;
    margin-top: 40px;
    margin-bottom: 20px;
    letter-spacing: -0.56px;
}

h3 {
    font-size: 22px;
    font-weight: 700;
    color: #111827;
    margin-top: 30px;
    margin-bottom: 15px;
    letter-spacing: -0.44px;
}

h4 {
    font-size: 18px;
    font-weight: 600;
    color: #111827;
    margin-top: 20px;
    margin-bottom: 10px;
}

p {
    margin-bottom: 15px;
    font-size: 15px;
    color: #1a1c1e;
}

ul {
    margin-bottom: 20px;
    margin-left: 25px;
}

li {
    margin-bottom: 10px;
    font-size: 15px;
    color: #1a1c1e;
}

ul ul {
    margin-top: 10px;
    margin-left: 20px;
}

a {
    color: #13eca4;
    text-decoration: none;
    font-weight: 600;
    transition: opacity 0.2s;
}

a:hover {
    opacity: 0.8;
}

strong {
    font-weight: 600;
    color: #111827;
}

.important-note {
    background: #fff3cd;
    border: 2px solid #ffc107;
    border-radius: 10px;
    padding: 20px;
    margin: 25px 0;
}

.important-note h4 {
    color: #856404;
    margin-top: 0;
    margin-bottom: 15px;
}

.important-note p {
    color: #856404;
}

.important-note ul {
    margin-bottom: 0;
}

.important-note li {
    color: #856404;
}

.footer {
    text-align: center;
    margin-top: 50px;
    padding-top: 30px;
    border-top: 2px solid #edf1f3;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    .container {
        padding: 24px;
        margin-top: 10px;
    }

    .header h1 {
        font-size: 28px;
    }

    h2 {
        font-size: 24px;
    }

    h3 {
        font-size: 20px;
    }

    h4 {
        font-size: 16px;
    }

    p, li {
        font-size: 14px;
    }

    ul {
        margin-left: 20px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 20px;
    }

    .header h1 {
        font-size: 24px;
    }

    h2 {
        font-size: 20px;
    }

    h3 {
        font-size: 18px;
    }
}