/* ── Doc content — Markdig-generated HTML, Tailwind can't reach these elements ── */
.doc-content {
    line-height: 1.75;
    color: var(--md-sys-color-on-surface);
    font-size: 1rem;
}
.doc-content h1 { font-size: 1.875rem; font-weight: 700; margin: 2rem 0 .75rem; }
.doc-content h2 { font-size: 1.375rem; font-weight: 600; margin: 1.75rem 0 .6rem; }
.doc-content h3 { font-size: 1.125rem; font-weight: 600; margin: 1.5rem 0 .5rem; }
.doc-content h4, .doc-content h5, .doc-content h6 { font-weight: 600; margin: 1.25rem 0 .5rem; }
.doc-content p  { margin: .75rem 0; }
.doc-content a  { color: var(--md-sys-color-primary); text-decoration: none; }
.doc-content a:hover { text-decoration: underline; }
.doc-content ul, .doc-content ol { padding-left: 1.5rem; margin: .75rem 0; }
.doc-content li { margin: .25rem 0; }
.doc-content pre {
    background: #1e1e2e;
    border: 1px solid var(--md-sys-color-outline-variant);
    border-radius: 12px;
    padding: 1.25rem;
    overflow-x: auto;
    margin: 1.25rem 0;
}
.doc-content :not(pre) > code {
    font-size: .875em;
    background: var(--md-sys-color-surface-container);
    border-radius: 4px;
    padding: .15em .4em;
    color: var(--md-sys-color-primary);
}
.doc-content table { border-collapse: collapse; width: 100%; margin: 1.25rem 0; }
.doc-content th, .doc-content td {
    border: 1px solid var(--md-sys-color-outline-variant);
    padding: .5rem .875rem;
    text-align: left;
}
.doc-content th {
    background: var(--md-sys-color-surface-container);
    font-weight: 600;
    font-size: .875rem;
    color: var(--md-sys-color-on-surface-variant);
}
.doc-content blockquote {
    border-left: 4px solid var(--md-sys-color-primary);
    margin: 1.25rem 0;
    padding: .75rem 1.25rem;
    background: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    border-radius: 0 8px 8px 0;
}
.doc-content hr {
    border: none;
    border-top: 1px solid var(--md-sys-color-outline-variant);
    margin: 2rem 0;
}
.doc-content img { max-width: 100%; border-radius: 8px; cursor: pointer; transition: opacity 0.2s; }
.doc-content img:hover { opacity: 0.9; }

/* ── Lightbox ── */
#lightbox-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: 10000;
    align-items: center;
    justify-content: center;
}
#lightbox-overlay.active {
    display: flex;
}
.lightbox-backdrop {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(4px);
}
.lightbox-image {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    object-fit: contain;
    border-radius: 4px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    z-index: 1;
}
.lightbox-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(255, 255, 255, 0.15);
    border: none;
    color: white;
    font-size: 1.5rem;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
    z-index: 2;
}
.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* ── Breadcrumb ── */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: .35rem;
    font-size: .8125rem;
    color: var(--md-sys-color-on-surface-variant);
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
}
.breadcrumb-sep { color: var(--md-sys-color-outline-variant); user-select: none; }
.breadcrumb-folder { color: var(--md-sys-color-on-surface-variant); }

/* ── Status messages ── */
.msg-ok  { color: var(--md-sys-color-secondary); font-size: .875rem; }
.msg-err { color: var(--md-sys-color-error);     font-size: .875rem; }

/* ── Blazor error UI ── */
#blazor-error-ui {
    display: none;
    position: fixed;
    bottom: 0; left: 0; right: 0;
    padding: .75rem 1.5rem;
    background: var(--md-sys-color-error-container);
    color: var(--md-sys-color-on-error-container);
    border-top: 1px solid var(--md-sys-color-error);
    z-index: 9999;
    font-size: .875rem;
}
#blazor-error-ui .dismiss { cursor: pointer; float: right; }

/* ── Sidebar folder toggle ── */
.folder-header {
    cursor: pointer;
    user-select: none;
}
.folder-toggle {
    display: inline-block;
    font-size: 10px;
    transition: transform 0.15s;
}
.folder-toggle.collapsed {
    transform: rotate(-90deg);
}

/* ── Theme-aware utility classes (fallback for Tailwind config issues) ── */
.bg-md-background { background-color: var(--md-sys-color-background) !important; }
.text-md-on-background { color: var(--md-sys-color-on-background) !important; }
.bg-md-surface { background-color: var(--md-sys-color-surface) !important; }
.text-md-on-surface { color: var(--md-sys-color-on-surface) !important; }
.bg-md-surface-container { background-color: var(--md-sys-color-surface-container) !important; }
.bg-md-surface-container-low { background-color: var(--md-sys-color-surface-container-low) !important; }
.border-md-outline-variant { border-color: var(--md-sys-color-outline-variant) !important; }
.text-md-on-surface-variant { color: var(--md-sys-color-on-surface-variant) !important; }
.bg-md-primary { background-color: var(--md-sys-color-primary) !important; }
.text-md-on-primary { color: var(--md-sys-color-on-primary) !important; }
.bg-md-primary-container { background-color: var(--md-sys-color-primary-container) !important; }
.text-md-on-primary-container { color: var(--md-sys-color-on-primary-container) !important; }
.bg-md-surface-container-high { background-color: var(--md-sys-color-surface-container-high) !important; }
.bg-md-tertiary-container { background-color: var(--md-sys-color-tertiary-container) !important; }
.text-md-on-tertiary-container { color: var(--md-sys-color-on-tertiary-container) !important; }
.bg-md-error-container { background-color: var(--md-sys-color-error-container) !important; }
.text-md-on-error-container { color: var(--md-sys-color-on-error-container) !important; }
.bg-md-inverse-surface { background-color: var(--md-sys-color-inverse-surface) !important; }
.text-md-inverse-on-surface { color: var(--md-sys-color-inverse-on-surface) !important; }

/* ── EasyMDE Editor ── */
.EasyMDEContainer {
    border-radius: 12px;
    overflow: hidden;
}
.editor-toolbar {
    background: var(--md-sys-color-surface-container);
    border-color: var(--md-sys-color-outline-variant);
    border-radius: 12px 12px 0 0;
}
.editor-toolbar button {
    color: var(--md-sys-color-on-surface-variant);
}
.editor-toolbar button:hover, .editor-toolbar button.active {
    background: var(--md-sys-color-primary-container);
    border-color: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary-container);
}
.editor-toolbar i.separator {
    border-color: var(--md-sys-color-outline-variant);
}
.CodeMirror {
    background: var(--md-sys-color-surface);
    color: var(--md-sys-color-on-surface);
    border-color: var(--md-sys-color-outline-variant);
    border-radius: 0 0 12px 12px;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    font-size: 0.9375rem;
    line-height: 1.75;
    padding: 0.5rem;
}
.CodeMirror-cursor {
    border-color: var(--md-sys-color-primary);
}
.CodeMirror-selected {
    background: var(--md-sys-color-primary-container) !important;
}
.CodeMirror-gutters {
    background: var(--md-sys-color-surface-container);
    border-color: var(--md-sys-color-outline-variant);
}
.CodeMirror-linenumber {
    color: var(--md-sys-color-on-surface-variant);
}
.CodeMirror-placeholder {
    color: var(--md-sys-color-outline);
}
.editor-preview-side {
    background: var(--md-sys-color-surface);
}
.editor-preview-side .doc-content {
    padding: 1rem;
}

/* ── Quiz ── */
.quiz-container {
    background: var(--md-sys-color-surface-container);
    border: 1px solid var(--md-sys-color-outline-variant);
    border-radius: 12px;
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.quiz-question {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--md-sys-color-on-surface);
    margin-bottom: 1rem;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.quiz-option {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background: var(--md-sys-color-surface);
    border: 2px solid var(--md-sys-color-outline-variant);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    user-select: none;
}

.quiz-option:hover:not(.quiz-correct):not(.quiz-incorrect) {
    border-color: var(--md-sys-color-primary);
    background: var(--md-sys-color-primary-container);
}

.quiz-option-text {
    color: var(--md-sys-color-on-surface);
    font-size: 0.9375rem;
}

.quiz-icon {
    font-size: 1.25rem;
    font-weight: bold;
    min-width: 1.5rem;
    text-align: center;
}

.quiz-correct {
    border-color: var(--md-sys-color-secondary) !important;
    background: var(--md-sys-color-secondary-container) !important;
}

.quiz-correct .quiz-icon {
    color: var(--md-sys-color-on-secondary-container);
}

.quiz-incorrect {
    border-color: var(--md-sys-color-error) !important;
    background: var(--md-sys-color-error-container) !important;
}

.quiz-incorrect .quiz-icon {
    color: var(--md-sys-color-on-error-container);
}

.quiz-feedback {
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 0.9375rem;
    font-weight: 500;
}

.quiz-feedback-correct {
    background: var(--md-sys-color-secondary-container);
    color: var(--md-sys-color-on-secondary-container);
    display: block !important;
}

.quiz-feedback-incorrect {
    background: var(--md-sys-color-error-container);
    color: var(--md-sys-color-on-error-container);
    display: block !important;
}