/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navigation */
.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar h1 a {
    color: white;
    text-decoration: none;
    font-size: 1.8rem;
    font-weight: bold;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: background-color 0.3s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links a:hover {
    background-color: rgba(255,255,255,0.2);
}

/* Content */
.content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    flex: 1;
}

h1, h2, h3, h4, h5 {
    color: #2d3748;
    margin: 1.5rem 0 0.75rem;
}

/* Content */
.content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    flex: 1;
}

h1, h2, h3, h4, h5 {
    color: #2d3748;
    margin: 1.5rem 0 0.75rem;
}

/* Brand */
.nav-left { display:flex; align-items:center; gap:0.75rem; }
.site-logo { height:48px; width:auto; border-radius:6px; background: white; padding:4px; box-shadow:0 2px 6px rgba(0,0,0,0.12); }
.navbar h1 { display:inline-block; margin:0; font-size:1.4rem; color:white; }
@media (max-width: 768px) { .site-logo{height:36px;} .nav-left{width:100%; justify-content:flex-start;} }

/* Graph header */
.graph-header { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); padding: 0.5rem 0; box-shadow: 0 2px 10px rgba(0,0,0,0.05); }
.graph-header .nav-container { max-width:1200px; margin:0 auto; padding:0 2rem; display:flex; justify-content:space-between; align-items:center; }

p {
    margin: 0.75rem 0;
}

/* Cards for index */
.concept-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.concept-card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    padding: 1rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.concept-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.12);
}

.concept-card h4 a {
    color: #1a202c;
    text-decoration: none;
}

/******** Admonitions ********/
.admonitionblock {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.06);
    padding: 1rem 1.25rem;
    margin: 1rem 0;
    border-left: 4px solid #a3bffa;
}
.admonitionblock td.icon {
    width: 2rem;
    text-align: center;
    vertical-align: top;
}
.admonitionblock td.icon i.fa {
    position: relative;
    width: 1.25rem;
    height: 1.25rem;
    display: inline-block;
}
.admonitionblock td.icon i.fa:before {
    font-family: "FontAwesome";
    font-style: normal;
    font-weight: normal;
    speak: none;
    display: inline-block;
    text-decoration: inherit;
}
.admonitionblock td.icon .icon-note:before { content: "\f05a"; color: #3182ce; }
.admonitionblock td.icon .icon-tip:before { content: "\f0eb"; color: #d69e2e; }
.admonitionblock td.icon .icon-important:before { content: "\f06a"; color: #dd6b20; }
.admonitionblock td.icon .icon-warning:before { content: "\f071"; color: #dd6b20; }
.admonitionblock td.icon .icon-caution:before { content: "\f06d"; color: #e53e3e; }

.admonitionblock table {
    width: 100%;
    border-collapse: collapse;
}
.admonitionblock table td.content {
    padding-left: 0.75rem;
}

/* Code blocks */
pre, code, pre code {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

/* Mermaid diagrams */
.mermaid {
    text-align: center;
    margin: 2rem 0;
    padding: 1rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

/* Footer */
footer {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2rem 0;
    text-align: center;
    margin-top: 4rem;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
}

footer p {
    margin: 0.5rem 0;
}

footer a {
    color: white;
    text-decoration: underline;
}

footer a:hover {
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        flex-direction: column;
        gap: 0.5rem;
        width: 100%;
    }

    .nav-links a {
        text-align: center;
    }

    .content {
        padding: 1rem;
    }

    .info-grid, .page-list, .quick-links {
        grid-template-columns: 1fr;
    }
}

/* Links */
a {
    color: #667eea;
    transition: color 0.2s ease;
}

a:hover {
    color: #764ba2;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

th, td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid #e2e8f0;
}

th {
    background: #f7fafc;
    font-weight: 600;
    color: #2d3748;
}

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

tr:hover {
    background: #f7fafc;
}