* {
    box-sizing: border-box;
}

@media print {
    body {
        margin: 0;
        padding: 20mm;
    }

    .page-break {
        page-break-before: always;
    }

    a {
        color: #000;
        text-decoration: none;
    }

    .header-gradient {
        background: #2c3e50 !important;
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.7;
    color: #2d3748;
    margin: 0;
    padding: 0;
    background: #f7fafc;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    background: #ffffff;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
}

.header-gradient {
    background: linear-gradient(135deg, #ff5757 0%, #6d42c7 100%);
    padding: 60px 40px;
    color: white;
    text-align: center;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0 0 15px 0;
    color: white;
    letter-spacing: -0.5px;
}

.subtitle {
    color: rgba(255, 255, 255, 0.95);
    font-size: 1.25rem;
    font-weight: 400;
    margin: 0;
    letter-spacing: 0.3px;
}

.content {
    padding: 50px 40px;
}

h2 {
    color: #1a202c;
    font-size: 2rem;
    font-weight: 700;
    margin: 50px 0 20px 0;
    padding-bottom: 15px;
    border-bottom: 3px solid #FF8A00;
    position: relative;
}

h2::before {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 80px;
    height: 3px;
    background: #ff5757;
}

h3 {
    color: #2d3748;
    font-size: 1.5rem;
    font-weight: 600;
    margin: 35px 0 15px 0;
}

h4 {
    color: #4a5568;
    font-size: 1.2rem;
    font-weight: 600;
    margin: 25px 0 12px 0;
}

p {
    margin: 15px 0;
    color: #4a5568;
}

strong {
    color: #2d3748;
    font-weight: 600;
}

code {
    background: #edf2f7;
    color: #d53f8c;
    padding: 3px 8px;
    border-radius: 4px;
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;
    font-size: 0.9em;
    font-weight: 500;
}

ul,
ol {
    margin: 20px 0;
    padding-left: 30px;
}

li {
    margin: 12px 0;
    color: #4a5568;
    line-height: 1.8;
}

li::marker {
    color: #FF8A00;
    font-weight: 600;
}

.checkmark {
    color: #38a169;
    font-weight: bold;
    font-size: 1.1em;
}

.arrow {
    color: #FF8A00;
    font-weight: bold;
    font-size: 1.1em;
}

a {
    color: #FF8A00;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s ease;
    border-bottom: 2px solid transparent;
}

a:hover {
    color: #ff5757;
    border-bottom-color: #ff5757;
}

.toc {
    background: linear-gradient(135deg, #f7fafc 0%, #edf2f7 100%);
    padding: 30px;
    border-radius: 12px;
    margin: 40px 0;
    border: 1px solid #e2e8f0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.toc h2 {
    margin-top: 0;
    border: none;
    padding-bottom: 0;
    font-size: 1.5rem;
}

.toc h2::before {
    display: none;
}

.toc ol {
    margin: 15px 0;
    counter-reset: item;
    padding-left: 0;
}

.toc li {
    display: block;
    margin: 10px 0;
    padding-left: 35px;
    position: relative;
}

.toc li::before {
    content: counter(item) ".";
    counter-increment: item;
    position: absolute;
    left: 0;
    color: #FF8A00;
    font-weight: 700;
    font-size: 1.1em;
}

.toc a {
    border: none;
    font-size: 1.05rem;
}

.note {
    background: linear-gradient(135deg, #fefcbf 0%, #faf089 100%);
    border-left: 5px solid #f59e0b;
    padding: 20px 25px;
    margin: 25px 0;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.15);
}

.note::before {
    content: '💡 ';
    font-size: 1.3em;
}

.warning {
    background: linear-gradient(135deg, #fed7d7 0%, #feb2b2 100%);
    border-left: 5px solid #e53e3e;
    padding: 20px 25px;
    margin: 25px 0;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(229, 62, 62, 0.15);
}

.warning::before {
    content: '⚠️ ';
    font-size: 1.3em;
}

.success {
    background: linear-gradient(135deg, #c6f6d5 0%, #9ae6b4 100%);
    border-left: 5px solid #38a169;
    padding: 20px 25px;
    margin: 25px 0;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(56, 161, 105, 0.15);
}

.success::before {
    content: '✅ ';
    font-size: 1.3em;
}

blockquote {
    background: linear-gradient(135deg, #e6fffa 0%, #b2f5ea 100%);
    border-left: 5px solid #319795;
    margin: 25px 0;
    padding: 20px 25px;
    color: #234e52;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(49, 151, 149, 0.15);
}

blockquote::before {
    content: '🔒 ';
    font-size: 1.3em;
}

blockquote strong {
    color: #c53030;
}

.info-box {
    background: linear-gradient(135deg, #bee3f8 0%, #90cdf4 100%);
    border-left: 5px solid #3182ce;
    padding: 20px 25px;
    margin: 25px 0;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(49, 130, 206, 0.15);
}

.info-box::before {
    content: 'ℹ️ ';
    font-size: 1.3em;
}

.info-box h3 {
    margin-top: 0;
    color: #2c5282;
}

.footer {
    text-align: center;
    padding: 50px 40px;
    background: linear-gradient(135deg, #1a202c 0%, #2d3748 100%);
    color: #e2e8f0;
}

.footer h2 {
    color: white;
    border: none;
    margin: 0 0 15px 0;
    padding: 0;
    font-size: 1.5rem;
}

.footer h2::before {
    display: none;
}

.footer p {
    color: #cbd5e0;
    margin: 10px 0;
}

hr {
    border: none;
    height: 1px;
    background: linear-gradient(90deg, transparent, #e2e8f0, transparent);
    margin: 40px 0;
}

@media (max-width: 768px) {
    .header-gradient {
        padding: 40px 20px;
    }

    h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1.1rem;
    }

    .content {
        padding: 30px 20px;
    }

    h2 {
        font-size: 1.6rem;
    }

    h3 {
        font-size: 1.3rem;
    }
}