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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: #2c3e50;
    background: #f8f9fa;
}

/* Container */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
    background: #ffffff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

/* Header */
.header {
    text-align: center;
    padding: 40px 20px 30px;
    border-bottom: 3px solid #4a90e2;
    margin-bottom: 40px;
}

.logo-link {
    display: inline-block;
    font-size: 24px;
    font-weight: 700;
    color: #4a90e2;
    text-decoration: none;
    margin-bottom: 20px;
    transition: color 0.2s ease;
}

.logo-link:hover {
    color: #357abd;
}

.header h1 {
    font-size: 32px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 10px;
}

.last-updated {
    font-size: 14px;
    color: #6c757d;
    font-style: italic;
}

/* Content */
.content {
    padding: 0 20px 40px;
}

section {
    margin-bottom: 40px;
}

section:last-child {
    margin-bottom: 0;
}

h2 {
    font-size: 24px;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #e9ecef;
}

h3 {
    font-size: 20px;
    font-weight: 600;
    color: #34495e;
    margin: 25px 0 15px;
}

p {
    margin-bottom: 15px;
    text-align: justify;
}

.intro {
    background: #f0f7ff;
    padding: 25px;
    border-radius: 8px;
    border-left: 4px solid #4a90e2;
    margin-bottom: 30px;
}

.intro p {
    margin-bottom: 15px;
}

.important {
    background: #fff3cd;
    padding: 15px;
    border-radius: 6px;
    border-left: 4px solid #ffc107;
    font-weight: 500;
    margin-top: 15px;
}

/* Lists */
ul {
    list-style: none;
    padding-left: 0;
    margin-bottom: 20px;
}

ul li {
    padding: 10px 0 10px 25px;
    position: relative;
    line-height: 1.6;
}

ul li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #4a90e2;
    font-weight: 700;
    font-size: 18px;
}

/* Links */
a {
    color: #4a90e2;
    text-decoration: none;
    transition: color 0.2s ease;
    border-bottom: 1px solid transparent;
}

a:hover {
    color: #357abd;
    border-bottom-color: #357abd;
}

/* Footer */
.footer {
    text-align: center;
    padding: 30px 20px;
    border-top: 2px solid #e9ecef;
    margin-top: 40px;
}

.back-link {
    display: inline-block;
    font-size: 16px;
    font-weight: 500;
    color: #4a90e2;
    padding: 12px 24px;
    border: 2px solid #4a90e2;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.back-link:hover {
    background: #4a90e2;
    color: #ffffff;
    border-bottom-color: #4a90e2;
}

.footer-note {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 6px;
    margin-top: 30px;
    font-size: 14px;
    color: #6c757d;
    text-align: center;
}

/* Mobile Optimization */
@media (max-width: 768px) {
    .container {
        padding: 15px;
        margin: 0;
        box-shadow: none;
    }

    .header {
        padding: 30px 15px 20px;
    }

    .header h1 {
        font-size: 26px;
    }

    .content {
        padding: 0 10px 30px;
    }

    h2 {
        font-size: 20px;
    }

    h3 {
        font-size: 18px;
    }

    .intro {
        padding: 20px;
    }

    ul li {
        padding-left: 20px;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 15px;
    }

    .header h1 {
        font-size: 22px;
    }

    .logo-link {
        font-size: 20px;
    }

    h2 {
        font-size: 18px;
    }

    h3 {
        font-size: 16px;
    }
}

/* Print Styles */
@media print {
    body {
        background: #ffffff;
    }

    .container {
        box-shadow: none;
        max-width: 100%;
    }

    .footer {
        display: none;
    }

    a {
        color: #000000;
        text-decoration: underline;
    }
}