/* ============================================
   UltraByte / UltraProject — Application Styles
   Same visual language as the other Ultra apps: navy chrome, #4a90d9 accent,
   UltraByte amber for the brand glyph. Dark mode via Bootstrap's data-bs-theme.
   ============================================ */

:root {
    --nav-bg: linear-gradient(90deg, #1a1a2e 0%, #16213e 100%);
    --brand: #FFC107;
    --accent: #4a90d9;
    --accent-hover: #3a7bc8;
    --accent-light: rgba(74, 144, 217, 0.1);

    --body-bg: #f4f6f9;
    --content-bg: #ffffff;
    --text-primary: #2d3436;
    --text-secondary: #636e72;
    --border-color: #e3e5ec;

    --success: #27ae60;
    --warning: #f39c12;
    --danger: #e74c3c;

    --border-radius: 8px;
    --border-radius-lg: 12px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);

    --bs-primary: #4a90d9;
    --bs-primary-rgb: 74, 144, 217;
    --bs-link-color: #3a7bc8;
    --bs-link-color-rgb: 58, 123, 200;
    --bs-link-hover-color: #2b65a8;
    --bs-body-bg: var(--body-bg);
    --bs-body-color: var(--text-primary);
    --bs-border-color: var(--border-color);
}

[data-bs-theme="dark"] {
    --body-bg: #1a1a2e;
    --content-bg: #242440;
    --text-primary: #e4e4ec;
    --text-secondary: #a8a8b8;
    --border-color: #3a3a52;
    --accent-light: rgba(74, 144, 217, 0.16);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.25);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);

    --bs-body-bg: var(--body-bg);
    --bs-body-color: var(--text-primary);
    --bs-secondary-color: var(--text-secondary);
    --bs-border-color: var(--border-color);
    --bs-tertiary-bg: #2a2a48;
    --bs-secondary-bg: #2a2a48;
    --bs-link-color: #7fb3ea;
    --bs-link-color-rgb: 127, 179, 234;
    --bs-link-hover-color: #a5caf1;
}

[data-bs-theme="dark"] .form-control,
[data-bs-theme="dark"] .form-select,
[data-bs-theme="dark"] .input-group-text {
    background-color: #2a2a48;
    border-color: var(--border-color);
    color: var(--text-primary);
}
[data-bs-theme="dark"] .dropdown-menu { --bs-dropdown-bg: #2a2a48; --bs-dropdown-border-color: var(--border-color); }
[data-bs-theme="dark"] .list-group { --bs-list-group-bg: transparent; --bs-list-group-border-color: var(--border-color); }
[data-bs-theme="dark"] .text-secondary { color: var(--text-secondary) !important; }

html, body {
    background: var(--body-bg);
    color: var(--text-primary);
}

body {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
}

.btn-primary {
    --bs-btn-bg: var(--accent);
    --bs-btn-border-color: var(--accent);
    --bs-btn-hover-bg: var(--accent-hover);
    --bs-btn-hover-border-color: var(--accent-hover);
    --bs-btn-active-bg: var(--accent-hover);
    --bs-btn-active-border-color: var(--accent-hover);
    --bs-btn-disabled-bg: var(--accent);
    --bs-btn-disabled-border-color: var(--accent);
}
.btn-outline-primary {
    --bs-btn-color: var(--accent);
    --bs-btn-border-color: var(--accent);
    --bs-btn-hover-bg: var(--accent);
    --bs-btn-hover-border-color: var(--accent);
    --bs-btn-active-bg: var(--accent);
}
.nav-pills { --bs-nav-pills-link-active-bg: var(--accent); }

.min-w-0 { min-width: 0; }

/* --- Boot screen (before Blazor starts) --- */
.boot-screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: .6rem;
    font-size: 1.4rem;
    color: var(--text-secondary);
}
.boot-screen i { color: var(--brand); font-size: 2rem; animation: pulse 1.4s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .35; } }

/* --- Layout --- */
.site { min-height: 100vh; display: flex; flex-direction: column; }
.site-main { flex: 1 0 auto; }

.site-nav {
    background: var(--nav-bg);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1020;
}
.site-nav .navbar-brand { font-weight: 400; letter-spacing: .02em; }
.site-nav .nav-link { color: #c8c8d4; }
.site-nav .nav-link:hover, .site-nav .nav-link.active { color: #fff; }
.site-nav .theme-toggle { text-decoration: none; }
.brand-glyph { color: var(--brand); }

.site-footer {
    border-top: 1px solid var(--border-color);
    padding: 1.25rem 0;
    font-size: .875rem;
    color: var(--text-secondary);
}
.site-footer a { color: inherit; }

/* --- Page header --- */
.page-header {
    padding: 2rem 0 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background: radial-gradient(900px 260px at 0% -20%, rgba(74, 144, 217, .14), transparent 60%);
}
.page-title { font-size: 1.75rem; font-weight: 700; margin-bottom: .25rem; }
.page-lead { color: var(--text-secondary); }

.panel {
    background: var(--content-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
}
.panel-highlight { border-color: var(--warning); }
.code-block, .template-source {
    background: #1a1a2e;
    color: #e4e4ec;
    border-radius: var(--border-radius);
    padding: 1rem;
    white-space: pre-wrap;
    word-break: break-word;
}
.template-source { font-size: .85rem; max-height: none; }

/* --- Filters --- */
.filter-bar {
    background: var(--content-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 1rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
}
.cat-filter { display: flex; flex-wrap: wrap; gap: .4rem; }
.cat-filter-btn {
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-primary);
    border-radius: 999px;
    padding: .3rem .8rem;
    font-size: .85rem;
}
.cat-filter-btn:hover:not(:disabled) { border-color: var(--accent); }
.cat-filter-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.cat-filter-btn:disabled { opacity: .4; }
.cat-count { opacity: .7; margin-left: .2rem; font-size: .8em; }

.empty-state { text-align: center; padding: 3rem 1rem; color: var(--text-secondary); }
.empty-state i { font-size: 2.5rem; display: block; margin-bottom: .5rem; }

/* --- Project card --- */
.project-card {
    display: flex;
    flex-direction: column;
    background: var(--content-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    text-decoration: none;
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
    transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.project-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--accent); color: var(--text-primary); }
.project-card-cover { position: relative; aspect-ratio: 16 / 10; background: var(--accent-light); overflow: hidden; }
.project-card-cover img { width: 100%; height: 100%; object-fit: cover; transition: transform .3s ease; }
.project-card:hover .project-card-cover img { transform: scale(1.04); }
.project-card-placeholder { width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; font-size: 3rem; color: var(--accent); }
.project-card-status { position: absolute; top: .6rem; left: .6rem; }
.project-card-body { padding: 1rem 1rem .5rem; flex: 1; }
.project-card-title { font-size: 1.05rem; font-weight: 650; margin-bottom: .35rem; }
.project-card-summary {
    font-size: .875rem;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: .6rem;
}
.project-card-cats { display: flex; flex-wrap: wrap; gap: .3rem; }
.project-card-footer {
    display: flex;
    justify-content: space-between;
    padding: .65rem 1rem;
    border-top: 1px solid var(--border-color);
    font-size: .8rem;
    color: var(--text-secondary);
}

.cat-chip {
    display: inline-flex;
    align-items: center;
    gap: .3rem;
    font-size: .75rem;
    padding: .15rem .55rem;
    border-radius: 999px;
    background: var(--accent-light);
    color: var(--accent);
    text-decoration: none;
    white-space: nowrap;
}
[data-bs-theme="dark"] .cat-chip { color: #8fbdee; }
a.cat-chip:hover { background: var(--accent); color: #fff; }

.difficulty { font-weight: 600; }
.difficulty-beginner { color: var(--success); }
.difficulty-intermediate { color: var(--warning); }
.difficulty-advanced { color: var(--danger); }

/* --- Project page --- */
.project-hero { position: relative; padding: 1.5rem 0 2rem; border-bottom: 1px solid var(--border-color); overflow: hidden; }
.project-hero-bg {
    position: absolute;
    inset: -40px;
    background-size: cover;
    background-position: center;
    filter: blur(40px) saturate(1.2);
    opacity: .18;
}
.project-title { font-size: clamp(1.75rem, 4vw, 2.5rem); font-weight: 700; letter-spacing: -.01em; }
.project-summary { font-size: 1.1rem; color: var(--text-secondary); }
.project-meta { display: flex; flex-wrap: wrap; gap: .5rem 1.25rem; font-size: .9rem; color: var(--text-secondary); }
.project-tags { display: flex; flex-wrap: wrap; gap: .25rem .75rem; font-size: .85rem; }
.project-tags a { text-decoration: none; }
.project-cover {
    width: 100%;
    max-height: 340px;
    object-fit: cover;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    cursor: zoom-in;
}

.section-nav-wrap { position: sticky; top: 72px; }
.section-nav {
    display: flex;
    flex-direction: column;
    gap: 2px;
    background: var(--content-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: .5rem;
    box-shadow: var(--shadow-sm);
}
.section-nav-link {
    display: flex;
    align-items: center;
    gap: .6rem;
    padding: .45rem .7rem;
    border-radius: var(--border-radius);
    color: var(--text-primary);
    text-decoration: none;
    font-size: .9rem;
}
.section-nav-link i { color: var(--text-secondary); width: 1rem; }
.section-nav-link:hover { background: var(--accent-light); color: var(--text-primary); }
.section-nav-link.active { background: var(--accent); color: #fff; }
.section-nav-link.active i { color: #fff; }

.downloads-box {
    margin-top: 1rem;
    background: var(--content-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 1rem;
    font-size: .875rem;
}
.downloads-title { font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; color: var(--text-secondary); margin-bottom: .5rem; }
.downloads-box li { display: flex; justify-content: space-between; gap: .5rem; padding: .2rem 0; word-break: break-all; }

.content-heading { font-size: 1.5rem; font-weight: 700; margin-bottom: 1rem; }

.section-pager {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 2.5rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border-color);
}
.section-pager-link {
    display: flex;
    align-items: center;
    gap: .75rem;
    text-decoration: none;
    padding: .6rem .9rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    max-width: 48%;
}
.section-pager-link:hover { border-color: var(--accent); color: var(--text-primary); }
.section-pager-link span { display: flex; flex-direction: column; }
.section-pager-link small { color: var(--text-secondary); font-size: .75rem; }

/* --- Rendered Markdown --- */
.md-content { font-size: 1rem; line-height: 1.7; }
.md-content > *:first-child { margin-top: 0; }
.md-content h3 { font-size: 1.2rem; font-weight: 650; margin-top: 1.75rem; }
.md-content h4 { font-size: 1.05rem; font-weight: 650; margin-top: 1.5rem; }
.md-content img.md-img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    margin: .5rem 0;
    cursor: zoom-in;
}
.md-content ol > li, .md-content ul > li { margin-bottom: .4rem; }
.md-content ol > li > p:first-child { margin-bottom: .4rem; }
.md-content code {
    background: var(--accent-light);
    color: inherit;
    padding: .1rem .35rem;
    border-radius: 4px;
    font-size: .875em;
}
.md-content pre {
    background: #1a1a2e;
    color: #e4e4ec;
    padding: 1rem;
    border-radius: var(--border-radius);
    overflow-x: auto;
}
.md-content pre code { background: none; padding: 0; font-size: .85rem; }
.md-content blockquote {
    border-left: 4px solid var(--border-color);
    padding: .6rem 1rem;
    margin: 1rem 0;
    color: var(--text-secondary);
}
.md-content blockquote > *:last-child { margin-bottom: 0; }
.md-content .callout { border-radius: 0 var(--border-radius) var(--border-radius) 0; color: var(--text-primary); }
.md-content .callout-warning { border-left-color: var(--warning); background: rgba(243, 156, 18, .1); }
.md-content .callout-info { border-left-color: var(--accent); background: var(--accent-light); }
.md-content .callout-tip { border-left-color: var(--brand); background: rgba(255, 193, 7, .1); }
.md-content .callout-success { border-left-color: var(--success); background: rgba(39, 174, 96, .1); }

.md-content .table-responsive { margin: 1rem 0; border: 1px solid var(--border-color); border-radius: var(--border-radius); }
.md-content table.md-table { margin-bottom: 0; font-size: .9rem; --bs-table-bg: transparent; }
.md-content table.md-table thead th {
    background: var(--accent-light);
    font-weight: 650;
    white-space: nowrap;
    border-bottom-width: 1px;
}
.md-content table.md-table td, .md-content table.md-table th { padding: .5rem .75rem; vertical-align: top; }
.md-content table.md-table tbody tr:last-child td { border-bottom: 0; }
.md-content tr.md-total td { border-top: 2px solid var(--text-secondary); border-bottom: 0; font-weight: 700; }
.md-content .md-total-amount { white-space: nowrap; }

.md-content a.md-file { font-weight: 600; text-decoration: none; }
.md-content .md-file-size { color: var(--text-secondary); font-size: .85em; }
.md-content .md-missing-image, .md-content .md-missing-file {
    display: inline-block;
    padding: .2rem .5rem;
    border: 1px dashed var(--danger);
    color: var(--danger);
    border-radius: 4px;
    font-size: .85rem;
}

.md-gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: .75rem; margin: 1rem 0; }
.md-gallery-item { margin: 0; }
.md-gallery-item img.md-img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; margin: 0; }
.md-gallery-item figcaption { font-size: .8rem; color: var(--text-secondary); margin-top: .3rem; line-height: 1.35; }

/* --- Lightbox --- */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(10, 10, 20, .94);
    display: none;
    align-items: center;
    justify-content: center;
}
.lightbox.open { display: flex; }
body.lightbox-open { overflow: hidden; }
.lightbox figure { margin: 0; max-width: 92vw; max-height: 88vh; display: flex; flex-direction: column; align-items: center; }
.lightbox img { max-width: 92vw; max-height: 80vh; object-fit: contain; border-radius: 6px; }
.lightbox figcaption { color: #c8c8d4; margin-top: .75rem; text-align: center; font-size: .95rem; }
.lightbox button {
    position: absolute;
    background: rgba(255, 255, 255, .1);
    border: 0;
    color: #fff;
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    font-size: 1.3rem;
}
.lightbox button:hover { background: rgba(255, 255, 255, .22); }
.lightbox-close { top: 1rem; right: 1rem; }
.lightbox-prev { left: 1rem; top: 50%; transform: translateY(-50%); }
.lightbox-next { right: 1rem; top: 50%; transform: translateY(-50%); }
.lightbox-count { position: absolute; top: 1.4rem; left: 1.4rem; color: #c8c8d4; font-size: .9rem; }

/* --- Login --- */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    background:
        radial-gradient(900px 400px at 20% 0%, rgba(74, 144, 217, .25), transparent 60%),
        var(--nav-bg);
}
.login-card {
    width: 100%;
    max-width: 400px;
    background: var(--content-bg);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
}
.login-brand { display: inline-flex; align-items: center; gap: .5rem; font-size: 1.25rem; color: var(--text-primary); text-decoration: none; margin-bottom: 1.5rem; }

/* --- Editor --- */
.editor-page { max-width: 1800px; }
.editor-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: .75rem;
    margin-bottom: 1rem;
}
.editor-card {
    background: var(--content-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}
.editor-card-header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: .75rem 1rem;
    background: transparent;
    border: 0;
    color: var(--text-primary);
    font-weight: 600;
}
.editor-card-body { padding: 0 1rem 1rem; }
.editor-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: .35rem;
    padding: .5rem;
    border-bottom: 1px solid var(--border-color);
}
.editor-section-menu { max-height: 60vh; overflow-y: auto; }
textarea.editor-textarea {
    border: 0;
    border-radius: 0;
    min-height: 70vh;
    font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
    font-size: .875rem;
    line-height: 1.55;
    resize: vertical;
    tab-size: 4;
}
textarea.editor-textarea:focus { box-shadow: none; }
.editor-right-tabs .nav-link { color: var(--text-secondary); }
.editor-right-tabs .nav-link.active { color: var(--text-primary); }
.editor-right { border-top-left-radius: 0; }
.editor-preview { padding: 1.25rem; max-height: calc(100vh - 170px); overflow-y: auto; }
@media (min-width: 1200px) {
    .editor-right { position: sticky; top: 72px; }
}

.upload-drop {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem;
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    text-align: center;
    transition: border-color .15s ease, background .15s ease;
}
.upload-drop:hover { border-color: var(--accent); background: var(--accent-light); }
.upload-drop i { font-size: 1.5rem; color: var(--accent); }
.upload-drop small { color: var(--text-secondary); }
.upload-drop input[type=file] { position: absolute; inset: 0; opacity: 0; cursor: pointer; }

.asset-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: .6rem; }
.asset-tile { border: 1px solid var(--border-color); border-radius: var(--border-radius); overflow: hidden; font-size: .78rem; }
.asset-tile img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; display: block; }
.asset-name { padding: .35rem .5rem 0; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.asset-meta { padding: 0 .5rem; color: var(--text-secondary); }
.asset-actions { display: flex; gap: .25rem; padding: .4rem .5rem .5rem; }

.issue-list { list-style: none; padding: 0; }
.issue { padding: .45rem .7rem; border-radius: var(--border-radius); margin-bottom: .35rem; font-size: .875rem; }
.issue-error { background: rgba(231, 76, 60, .1); border-left: 3px solid var(--danger); }
.issue-warning { background: rgba(243, 156, 18, .1); border-left: 3px solid var(--warning); }

/* --- Blazor error UI --- */
#blazor-error-ui {
    background: lightyellow;
    color: #2d3436;
    bottom: 0;
    box-shadow: 0 -1px 2px rgba(0, 0, 0, 0.2);
    display: none;
    left: 0;
    padding: 0.6rem 1.25rem 0.7rem 1.25rem;
    position: fixed;
    width: 100%;
    z-index: 3000;
}
#blazor-error-ui .dismiss { cursor: pointer; position: absolute; right: 0.75rem; top: 0.5rem; }

/* --- Mobile --- */
@media (max-width: 991.98px) {
    /* Project sub-menu becomes a horizontally scrolling pill bar */
    .section-nav-wrap { position: sticky; top: 56px; z-index: 10; margin: 0 -12px; }
    .section-nav {
        flex-direction: row;
        overflow-x: auto;
        flex-wrap: nowrap;
        border-radius: 0;
        border-left: 0;
        border-right: 0;
        scrollbar-width: none;
        -ms-overflow-style: none;
    }
    .section-nav::-webkit-scrollbar { display: none; }
    .section-nav-link { white-space: nowrap; flex: 0 0 auto; }
}

@media (max-width: 768px) {
    .mobile-hide { display: none; }
    .project-cover { max-height: 240px; }
    textarea.editor-textarea { min-height: 60vh; }
    .section-pager-link { max-width: 50%; }
    .editor-tabs { overflow-x: auto; flex-wrap: nowrap; scrollbar-width: none; }
    .editor-tabs::-webkit-scrollbar { display: none; }
    .editor-tabs .nav-link { white-space: nowrap; }
}

@media (max-width: 576px) {
    .page-title { font-size: 1.4rem; }
    .md-gallery { grid-template-columns: repeat(2, 1fr); gap: .5rem; }
    .md-content { font-size: .95rem; }
    .lightbox-prev, .lightbox-next { top: auto; bottom: 1rem; transform: none; }
}