/* Navigation styles for multi-page Tufte site */
/* Complements tufte.css - same font family and color scheme */

/* ========================================
   Top Navigation Bar
   ======================================== */

.site-nav {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: #fffff8;
    border-bottom: 1px solid #ccc;
    padding: 1rem 0;
    font-family: et-book, Palatino, "Palatino Linotype", "Palatino LT STD", "Book Antiqua", Georgia, serif;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 12.5%;
    text-align: center;
}

/* Site title - centered above chapter links */
.site-title {
    display: block;
    font-size: 1.4rem;
    font-variant: small-caps;
    letter-spacing: 0.1em;
    text-decoration: none;
    color: #111;
    margin-bottom: 0.5rem;
}

.site-title:hover {
    color: #111;
}

/* PDF download link */
.pdf-link {
    display: inline-block;
    font-size: 0.9rem;
    color: #111;
    text-decoration: none;
    margin-bottom: 0.8rem;
}

.pdf-link:hover {
    text-decoration: underline;
}

/* Chapter navigation links */
.chapter-nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem 1.5rem;
    list-style: none;
    margin: 0;
    padding: 0;
    font-size: 0.95rem;
}

.chapter-nav li {
    margin: 0;
    padding: 0;
}

.chapter-nav a {
    color: #111;
    text-decoration: none;
}

.chapter-nav a:hover {
    text-decoration: underline;
}

/* Current page indicator - bold text */
.chapter-nav .current {
    font-weight: bold;
}

/* ========================================
   Mobile Navigation (Hamburger Menu)
   ======================================== */

/* Hamburger toggle - hidden by default on desktop */
.nav-toggle {
    display: none;
}

.nav-toggle-label {
    display: none;
    cursor: pointer;
    font-size: 1.5rem;
    padding: 0.5rem;
    user-select: none;
}

/* Mobile breakpoint */
@media (max-width: 760px) {
    .nav-container {
        padding: 0 5%;
    }

    .site-title {
        font-size: 1.2rem;
    }

    /* Show hamburger icon */
    .nav-toggle-label {
        display: inline-block;
        margin-top: 0.5rem;
    }

    /* Hide chapter nav by default on mobile */
    .chapter-nav {
        display: none;
        flex-direction: column;
        gap: 0.8rem;
        margin-top: 1rem;
        padding-top: 1rem;
        border-top: 1px solid #ddd;
    }

    /* Show chapter nav when toggle is checked */
    .nav-toggle:checked ~ .chapter-nav {
        display: flex;
    }

    /* Rotate hamburger to X when open */
    .nav-toggle:checked + .nav-toggle-label::before {
        content: "\2715"; /* X symbol */
    }

    .nav-toggle-label::before {
        content: "\2630"; /* Hamburger symbol */
    }
}

/* ========================================
   Chapter Table of Contents (Index Page)
   ======================================== */

.chapter-toc {
    margin: 3rem 0;
    padding: 2rem 0;
    border-top: 1px solid #ccc;
}

.chapter-toc h2 {
    font-style: normal;
    font-variant: small-caps;
    font-size: 1.6rem;
    margin-bottom: 1.5rem;
}

.chapter-toc ol {
    margin: 0;
    padding-left: 0;
    list-style-position: inside;
}

.chapter-toc li {
    margin-bottom: 0.8rem;
    font-size: 1.1rem;
}

.chapter-toc a {
    color: #111;
    text-decoration: none;
}

.chapter-toc a:hover {
    text-decoration: underline;
}

/* ========================================
   Dark Mode Support
   ======================================== */

@media (prefers-color-scheme: dark) {
    .site-nav {
        background-color: #151515;
        border-bottom-color: #333;
    }

    .site-title,
    .pdf-link,
    .chapter-nav a,
    .chapter-toc a {
        color: #ddd;
    }

    .chapter-nav a:hover,
    .chapter-toc a:hover {
        color: #fff;
    }

    .chapter-toc {
        border-top-color: #333;
    }

    .nav-toggle-label {
        color: #ddd;
    }

    @media (max-width: 760px) {
        .chapter-nav {
            border-top-color: #333;
        }
    }
}

/* ========================================
   Adjustments for Tufte article spacing
   ======================================== */

/* Push article content below sticky nav */
body {
    padding-top: 0;
}

/* Ensure first element in article has proper spacing */
article {
    padding-top: 2rem;
}