/* DFT Blog Common Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    min-height: 100vh;
    color: #e0e0e0;
    line-height: 1.7;
}

/* Header */
.header {
    background: linear-gradient(90deg, #0f3460, #533483);
    padding: 30px 20px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.header-content {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    font-size: 1.5em;
    color: #00d4ff;
}

.header h1 a {
    color: #00d4ff;
    text-decoration: none;
}

.nav-links a {
    color: #b0b0b0;
    text-decoration: none;
    margin-left: 20px;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #00d4ff;
}

/* Main Content */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Article Header */
.article-header {
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 2px solid #2a3f5f;
}

.article-number {
    display: inline-block;
    background: linear-gradient(135deg, #00d4ff, #0099cc);
    color: #1a1a2e;
    font-weight: bold;
    padding: 5px 15px;
    border-radius: 20px;
    margin-bottom: 15px;
}

.article-header h1 {
    font-size: 2.5em;
    color: #ffffff;
    margin-bottom: 15px;
}

.article-header .subtitle {
    font-size: 1.2em;
    color: #a0a0a0;
    font-style: italic;
}

.article-header .author {
    font-size: 1em;
    color: #00d4ff;
    margin-top: 10px;
}

/* Content Sections */
h2 {
    color: #00d4ff;
    font-size: 1.8em;
    margin-top: 50px;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid #2a3f5f;
}

h3 {
    color: #ffffff;
    font-size: 1.3em;
    margin-top: 30px;
    margin-bottom: 15px;
}

h4 {
    color: #00d4ff;
    font-size: 1.1em;
    margin-top: 20px;
    margin-bottom: 10px;
}

p {
    margin-bottom: 15px;
    color: #d0d0d0;
}

/* Code Blocks */
pre {
    background: #0d1117;
    border: 1px solid #30363d;
    border-radius: 10px;
    padding: 20px;
    overflow-x: auto;
    margin: 20px 0;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9em;
    line-height: 1.5;
}

code {
    font-family: 'Consolas', 'Monaco', monospace;
    background: #2a3f5f;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
}

pre code {
    background: none;
    padding: 0;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background: #1e2a4a;
    border-radius: 10px;
    overflow: hidden;
}

th {
    background: linear-gradient(135deg, #0f3460, #1e3a5f);
    color: #00d4ff;
    padding: 15px;
    text-align: left;
    font-weight: 600;
}

td {
    padding: 12px 15px;
    border-bottom: 1px solid #2a3f5f;
}

tr:last-child td {
    border-bottom: none;
}

tr:hover {
    background: #253555;
}

/* Lists */
ul, ol {
    margin: 15px 0 15px 30px;
}

li {
    margin-bottom: 8px;
}

/* Blockquote / Tips */
blockquote {
    background: linear-gradient(135deg, #1e3a5f, #1e2a4a);
    border-left: 4px solid #00d4ff;
    padding: 20px;
    margin: 20px 0;
    border-radius: 0 10px 10px 0;
}

blockquote p {
    margin: 0;
}

.tip {
    background: linear-gradient(135deg, #1a4a3a, #1e2a4a);
    border-left: 4px solid #00ff88;
    padding: 15px 20px;
    margin: 20px 0;
    border-radius: 0 10px 10px 0;
}

.tip::before {
    content: "💡 Pro Tip: ";
    color: #00ff88;
    font-weight: bold;
}

.warning {
    background: linear-gradient(135deg, #4a3a1a, #4a2a1a);
    border-left: 4px solid #ff8800;
    padding: 15px 20px;
    margin: 20px 0;
    border-radius: 0 10px 10px 0;
}

.warning::before {
    content: "⚠️ Warning: ";
    color: #ff8800;
    font-weight: bold;
}

/* Diagrams (ASCII art) */
.diagram {
    background: #0a0a15;
    border: 1px solid #2a3f5f;
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.85em;
    line-height: 1.4;
    overflow-x: auto;
    white-space: pre;
    color: #00d4ff;
}

/* Navigation */
.nav-buttons {
    display: flex;
    justify-content: space-between;
    margin-top: 60px;
    padding-top: 30px;
    border-top: 2px solid #2a3f5f;
}

.nav-btn {
    display: inline-block;
    background: linear-gradient(135deg, #0f3460, #1e3a5f);
    color: #00d4ff;
    text-decoration: none;
    padding: 15px 25px;
    border-radius: 10px;
    transition: all 0.3s;
    border: 1px solid #2a3f5f;
}

.nav-btn:hover {
    background: linear-gradient(135deg, #1e3a5f, #2a4a6f);
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(0, 212, 255, 0.2);
}

.nav-btn.prev::before {
    content: "← ";
}

.nav-btn.next::after {
    content: " →";
}

.nav-btn.disabled {
    opacity: 0.5;
    pointer-events: none;
}

/* Summary Box */
.summary {
    background: linear-gradient(145deg, #1e2a4a, #162035);
    border: 1px solid #2a3f5f;
    border-radius: 15px;
    padding: 25px;
    margin: 30px 0;
}

.summary h3 {
    color: #00d4ff;
    margin-top: 0;
    margin-bottom: 15px;
}

/* Footer */
.footer {
    text-align: center;
    padding: 30px;
    color: #666;
    margin-top: 40px;
    border-top: 1px solid #2a3f5f;
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .nav-links {
        margin-top: 15px;
    }
    
    .nav-links a {
        margin: 0 10px;
    }
    
    .article-header h1 {
        font-size: 1.8em;
    }
    
    .nav-buttons {
        flex-direction: column;
        gap: 15px;
    }
    
    .nav-btn {
        text-align: center;
    }
    
    pre, .diagram {
        font-size: 0.8em;
    }
}

/* View Counter */
.view-counter {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, #1e2a4a, #162035);
    border: 1px solid #00d4ff;
    border-radius: 20px;
    padding: 8px 16px;
    font-size: 0.9em;
    color: #00d4ff;
    margin-top: 15px;
}

.view-counter svg {
    width: 18px;
    height: 18px;
    fill: #00d4ff;
}

.view-count {
    font-weight: bold;
    color: #ffffff;
}

.hero .view-counter {
    margin-top: 20px;
}

/* Cross-Promotion Section */
.promo-section {
    margin-top: 50px;
    padding-top: 40px;
    border-top: 2px solid #2a3f5f;
}

.promo-section h2 {
    color: #00d4ff;
    text-align: center;
    margin-bottom: 30px;
    font-size: 1.8em;
}

.promo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.promo-card {
    background: linear-gradient(135deg, #1e2a4a 0%, #162035 100%);
    border: 2px solid #2a3f5f;
    border-radius: 15px;
    padding: 30px;
    text-decoration: none;
    display: block;
    transition: all 0.3s;
    text-align: center;
}

.promo-card:hover {
    border-color: #00d4ff;
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.2);
}

.promo-card .promo-icon {
    font-size: 2.5em;
    margin-bottom: 15px;
}

.promo-card h3 {
    color: #00d4ff;
    font-size: 1.4em;
    margin-bottom: 10px;
}

.promo-card p {
    color: #aaa;
    font-size: 0.95em;
    margin-bottom: 15px;
}

.promo-card .promo-count {
    color: #888;
    font-size: 0.85em;
}