/* ═══════════════════════════════════════════════════════════════════════════
   APPLE-STYLE MINIMALIST THEME — A-to-Z Neurology
   Clean whites, generous whitespace, SF Pro-inspired typography,
   subtle shadows, frosted glass accents.
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── System Font Stack (SF Pro on Apple, Segoe on Windows) ────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --text-primary:    #1d1d1f;
    --text-secondary:  #6e6e73;
    --text-tertiary:   #86868b;
    --bg-primary:      #ffffff;
    --bg-secondary:    #f5f5f7;
    --bg-elevated:     #fbfbfd;
    --accent:          #0071e3;
    --accent-hover:    #0077ed;
    --border:          rgba(0, 0, 0, 0.06);
    --border-strong:   rgba(0, 0, 0, 0.12);
    --shadow-sm:       0 1px 3px rgba(0, 0, 0, 0.04);
    --shadow-md:       0 4px 16px rgba(0, 0, 0, 0.06);
    --shadow-lg:       0 8px 30px rgba(0, 0, 0, 0.08);
    --radius:          12px;
    --radius-sm:       8px;
    --transition:      0.25s cubic-bezier(0.25, 0.1, 0.25, 1);
}

/* ── Base ─────────────────────────────────────────────────────────────── */
body {
    background: var(--bg-secondary);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ── Main Content — Full width, clean ─────────────────────────────────── */
#quarto-content, .quarto-container {
    background: var(--bg-primary);
    max-width: 100%;
    margin: 0;
    padding: 2.5rem 3.5rem;
    border-radius: 0;
    box-shadow: none;
    border: none;
}

/* ── Typography ──────────────────────────────────────────────────────── */
#quarto-content p,
#quarto-content li,
#quarto-content td,
#quarto-content th,
#quarto-content dd {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Segoe UI', sans-serif;
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-primary);
    font-weight: 400;
    letter-spacing: -0.01em;
}

/* ── Headings — Bold, tight, Apple-style ─────────────────────────────── */
#quarto-content h1,
#quarto-content h2,
#quarto-content h3,
#quarto-content h4,
.quarto-title {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', sans-serif;
    color: var(--text-primary);
    letter-spacing: -0.025em;
    font-weight: 700;
}

/* Page / Chapter Title */
#quarto-content h1, .quarto-title {
    font-size: 2.4rem;
    font-weight: 700;
    margin-top: 0;
    margin-bottom: 1rem;
    line-height: 1.15;
}

/* Section Title — disease / symptom */
#quarto-content h2 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-top: 3rem;
    margin-bottom: 0.75rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    color: var(--text-primary);
}

/* First H2 — no top border */
#quarto-content h2:first-of-type {
    border-top: none;
    padding-top: 0;
    margin-top: 1.5rem;
}

/* Subsections */
#quarto-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

#quarto-content h4 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-top: 1.5rem;
}

/* ── Links — Minimal accent ──────────────────────────────────────────── */
#quarto-content a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition);
}

#quarto-content a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
    text-underline-offset: 3px;
    text-decoration-thickness: 1.5px;
}

/* ── Callout Boxes — Frosted glass cards ─────────────────────────────── */
.callout {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent);
    border-radius: var(--radius-sm);
    padding: 1rem 1.2rem;
    margin: 1.5rem 0;
    box-shadow: var(--shadow-sm);
}

.callout-tip {
    border-left-color: #34c759;
}

.callout-important {
    border-left-color: #ff9500;
}

.callout-warning {
    border-left-color: #ff3b30;
}

.callout-note {
    border-left-color: var(--accent);
}

/* ── Tables — Clean, minimal lines ───────────────────────────────────── */
#quarto-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 0.94rem;
}

#quarto-content th {
    font-family: 'Inter', -apple-system, sans-serif;
    font-weight: 600;
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-secondary);
    padding: 10px 14px;
    border-bottom: 2px solid var(--border-strong);
    text-align: left;
    background: transparent;
}

#quarto-content td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
}

#quarto-content tbody tr:hover {
    background: rgba(0, 113, 227, 0.02);
}

/* ── Sidebar — Frosted, clean ────────────────────────────────────────── */
#quarto-sidebar, .sidebar-navigation {
    background: rgba(245, 245, 247, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-right: 1px solid var(--border);
    font-family: 'Inter', -apple-system, sans-serif;
}

#quarto-sidebar .sidebar-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    padding: 1rem 0.8rem 0.5rem;
}

#quarto-sidebar .sidebar-item a {
    color: var(--text-secondary);
    font-size: 0.84rem;
    font-weight: 400;
    padding: 6px 12px;
    border-radius: 6px;
    transition: all var(--transition);
    text-decoration: none;
    display: block;
}

#quarto-sidebar .sidebar-item a:hover {
    color: var(--text-primary);
    background: rgba(0, 0, 0, 0.04);
}

#quarto-sidebar .sidebar-item a.active,
#quarto-sidebar .sidebar-item .active > a {
    color: var(--accent);
    font-weight: 600;
    background: rgba(0, 113, 227, 0.06);
}

/* Section headers in sidebar */
.sidebar .sidebar-section .sidebar-section-item {
    font-weight: 600;
    font-size: 0.88rem;
    color: var(--text-primary);
    padding: 8px 12px 4px;
}

/* ── Page Transitions ────────────────────────────────────────────────── */
@keyframes page-slide-in {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

#quarto-content {
    animation: page-slide-in 0.35s ease-out;
}

/* ── Code blocks ─────────────────────────────────────────────────────── */
pre {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1rem;
    font-size: 0.88rem;
    overflow-x: auto;
}

code {
    font-family: 'SF Mono', 'Fira Code', 'JetBrains Mono', monospace;
    font-size: 0.88rem;
}

:not(pre) > code {
    background: var(--bg-secondary);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 0.88em;
}

/* ── Blockquotes ─────────────────────────────────────────────────────── */
blockquote {
    border-left: 3px solid var(--border-strong);
    padding: 0.5rem 1.2rem;
    margin: 1.5rem 0;
    color: var(--text-secondary);
    font-style: normal;
}

/* ── Strong / Bold ───────────────────────────────────────────────────── */
#quarto-content strong {
    font-weight: 600;
    color: var(--text-primary);
}

/* ── Images — Rounded, subtle shadow ─────────────────────────────────── */
#quarto-content img {
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
    max-width: 100%;
}

/* ── Video containers ────────────────────────────────────────────────── */
#quarto-content video {
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    max-width: 100%;
}

/* ── MCQ styling ─────────────────────────────────────────────────────── */
.mcq {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.2rem 1.5rem;
    margin: 2rem 0;
    box-shadow: var(--shadow-sm);
}

/* ── Horizontal rules — subtle ───────────────────────────────────────── */
hr {
    border: none;
    height: 1px;
    background: var(--border);
    margin: 2rem 0;
}

/* ── Lists — Clean spacing ───────────────────────────────────────────── */
#quarto-content ul, #quarto-content ol {
    padding-left: 1.4rem;
}

#quarto-content li {
    margin-bottom: 0.35rem;
}

#quarto-content li::marker {
    color: var(--text-tertiary);
}

/* ── Navbar override — clean top bar ─────────────────────────────────── */
.navbar {
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    background: rgba(255, 255, 255, 0.72) !important;
    border-bottom: 1px solid var(--border);
    box-shadow: none;
}

.navbar .navbar-nav .nav-link,
.navbar .navbar-brand,
.navbar .navbar-title {
    color: var(--accent) !important;
    font-weight: 500;
}

.navbar .navbar-nav .nav-link:hover {
    color: var(--accent-hover) !important;
}

/* ── Print ────────────────────────────────────────────────────────────── */
@media print {
    body { background: white; }
    #quarto-content { box-shadow: none; border: none; max-width: 100%; margin: 0; }
    #quarto-sidebar { display: none; }
}

/* ── Mobile ──────────────────────────────────────────────────────────── */
@media (max-width: 991px) {
    #quarto-content, .quarto-container {
        padding: 1.2rem 1rem;
        max-width: 100%;
    }

    #quarto-content h1 { font-size: 1.8rem; }
    #quarto-content h2 { font-size: 1.3rem; margin-top: 2rem; padding-top: 1.5rem; }

    /* Sidebar — hidden off-screen, slides in on toggle */
    #quarto-sidebar {
        position: fixed !important;
        top: 0;
        left: -300px;
        width: 280px;
        height: 100vh;
        z-index: 9998;
        background: rgba(255, 255, 255, 0.96);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.08);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        transition: left 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
        padding-top: 60px;
    }

    #quarto-sidebar.visible {
        left: 0 !important;
    }

    /* Floating TOC button styling */
    #toc-toggle {
        position: fixed !important;
        bottom: 20px !important;
        right: 20px !important;
        left: auto !important;
        top: auto !important;
        z-index: 9999 !important;
        background: var(--accent) !important;
        color: white !important;
        border: none !important;
        width: 52px !important;
        height: 52px !important;
        border-radius: 50% !important;
        font-size: 1.3rem !important;
        padding: 0 !important;
        box-shadow: 0 4px 16px rgba(0, 113, 227, 0.35) !important;
        cursor: pointer;
        display: flex !important;
        align-items: center;
        justify-content: center;
    }

    /* Overlay behind sidebar when open */
    #quarto-sidebar.visible::before {
        content: '';
        position: fixed;
        top: 0;
        left: 280px;
        width: calc(100vw - 280px);
        height: 100vh;
        background: rgba(0, 0, 0, 0.2);
        z-index: -1;
    }

    /* Better touch targets */
    #quarto-sidebar .sidebar-item a {
        padding: 10px 14px;
        font-size: 0.9rem;
    }
}

/* ── Tablet ──────────────────────────────────────────────────────────── */
@media (min-width: 992px) and (max-width: 1200px) {
    #quarto-content, .quarto-container {
        padding: 2rem 2.2rem;
    }
}