/* ============================================================
   VLYX Briefing – Application Styles
   Design-System 1:1 abgestimmt auf den VLYX-Navigator
   (Bootstrap 5.3.3 + Bootstrap Icons + --dva-* Tokens, 4 Themes)
   ============================================================ */

/* ===== CSS Custom Properties: THEME 1 – CLASSIC (Default) ===== */
:root,
.theme-classic {
    --dva-primary: #2563eb;
    --dva-primary-dark: #1d4ed8;
    --dva-primary-light: #dbeafe;
    --dva-primary-rgb: 37, 99, 235;
    --dva-sidebar-bg: #1e293b;
    --dva-sidebar-hover: #334155;
    --dva-sidebar-text: #cbd5e1;
    --dva-sidebar-text-active: #ffffff;
    --dva-sidebar-width: 260px;
    --dva-sidebar-border: rgba(255, 255, 255, 0.1);
    --dva-sidebar-brand: #ffffff;
    --dva-topbar-height: 56px;
    --dva-topbar-bg: #ffffff;
    --dva-content-bg: #f1f5f9;
    --dva-card-bg: #ffffff;
    --dva-card-radius: 0.5rem;
    --dva-card-shadow: none;
    --dva-border: #e2e8f0;
    --dva-text: #1e293b;
    --dva-text-muted: #64748b;
    --dva-table-header-bg: #f8fafc;
    --dva-table-hover-bg: #f8fafc;
    --dva-input-bg: #ffffff;
    --dva-input-border: #dee2e6;
    --dva-input-text: #1e293b;
    --dva-mobile-nav-bg: #ffffff;
    --dva-overlay-bg: rgba(0, 0, 0, 0.5);
    --dva-success: #16a34a;
    --dva-warning: #d97706;
    --dva-danger: #dc2626;
    --dva-info: #0891b2;
    --dva-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --dva-font-heading: var(--dva-font-family);
    --dva-heading-weight: 600;
    --dva-body-size: 0.9rem;
    --dva-badge-bg: #475569;
    --dva-badge-text: #ffffff;
    --dva-badge-outline-bg: transparent;
    --dva-badge-outline-text: #475569;
    --dva-badge-outline-border: #94a3b8;
    --dva-login-bg: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    --dva-login-card-bg: #ffffff;
    --dva-login-text: #1e293b;
}

/* ===== Reset / Base ===== */
body.app-body {
    font-family: var(--dva-font-family);
    background: var(--dva-content-bg);
    color: var(--dva-text);
    margin: 0;
    font-size: var(--dva-body-size);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--dva-font-heading);
    font-weight: var(--dva-heading-weight);
    color: var(--dva-text);
}

/* ===== App Layout ===== */
.app-wrapper {
    display: flex;
    min-height: 100vh;
}

.app-main {
    margin-left: var(--dva-sidebar-width);
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.app-content {
    padding: 1.5rem;
    flex: 1;
}

/* ===== Sidebar ===== */
.app-sidebar {
    width: var(--dva-sidebar-width);
    background: var(--dva-sidebar-bg);
    color: var(--dva-sidebar-text);
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    overflow-y: auto;
    z-index: 1040;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--dva-sidebar-border);
}

.sidebar-brand {
    color: var(--dva-sidebar-brand);
    text-decoration: none;
    font-size: 1.15rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar-brand:hover {
    color: var(--dva-sidebar-brand);
}

.sidebar-brand i {
    font-size: 1.4rem;
}

.sidebar-close {
    background: none;
    border: none;
    color: var(--dva-sidebar-text);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.25rem;
}

.sidebar-nav {
    flex: 1;
    padding: 0.75rem 0;
}

.sidebar-nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.65rem 1.25rem;
    color: var(--dva-sidebar-text);
    text-decoration: none;
    font-size: 0.9rem;
    transition: background-color 0.15s, color 0.15s;
    border-left: 3px solid transparent;
}

.sidebar-nav-item:hover {
    background: var(--dva-sidebar-hover);
    color: var(--dva-sidebar-text-active);
}

.sidebar-nav-item.active {
    background: var(--dva-sidebar-hover);
    color: var(--dva-sidebar-text-active);
    border-left-color: var(--dva-primary);
    font-weight: 500;
}

.sidebar-nav-item i {
    font-size: 1.15rem;
    width: 1.25rem;
    text-align: center;
}

.sidebar-divider {
    border-top: 1px solid var(--dva-sidebar-border);
    margin: 0.5rem 1.25rem;
}

.sidebar-section-label {
    padding: 0.4rem 1.25rem 0.2rem;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--dva-sidebar-text);
    opacity: 0.5;
    user-select: none;
}

.sidebar-footer {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--dva-sidebar-border);
}

.sidebar-user {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--dva-sidebar-text);
    font-size: 0.85rem;
}

.sidebar-user i {
    font-size: 1.25rem;
}

/* ===== Topbar ===== */
.app-topbar {
    height: var(--dva-topbar-height);
    background: var(--dva-topbar-bg);
    border-bottom: 1px solid var(--dva-border);
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
    position: sticky;
    top: 0;
    z-index: 1020;
}

.topbar-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--dva-text);
    cursor: pointer;
    padding: 0.25rem;
    margin-right: 0.75rem;
}

.topbar-title {
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--dva-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
}

.topbar-back-desktop {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--dva-primary);
    font-size: 1.1rem;
    width: 32px;
    height: 32px;
    border-radius: 6px;
    text-decoration: none;
    flex-shrink: 0;
    margin-right: 0.5rem;
    transition: background-color 0.15s, color 0.15s;
}

.topbar-back-desktop:hover {
    background-color: var(--dva-primary);
    color: #fff;
}

.topbar-breadcrumb {
    align-items: center;
    gap: 0;
    min-width: 0;
    overflow: hidden;
}

.topbar-breadcrumb-link {
    color: var(--dva-primary);
    text-decoration: none;
    font-size: 0.9rem;
    white-space: nowrap;
    flex-shrink: 0;
}

.topbar-breadcrumb-link:hover {
    color: var(--dva-primary-dark);
    text-decoration: underline;
}

.topbar-breadcrumb-sep {
    color: var(--dva-text-muted);
    font-size: 0.7rem;
    margin: 0 0.4rem;
    flex-shrink: 0;
}

.topbar-breadcrumb-current {
    color: var(--dva-text);
    font-size: 0.9rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
}

.topbar-actions .btn-link {
    text-decoration: none;
    font-size: 0.9rem;
}

/* ===== Mobile Navigation ===== */
.app-mobile-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--dva-mobile-nav-bg);
    border-top: 1px solid var(--dva-border);
    display: flex;
    justify-content: space-around;
    padding: 0.4rem 0 calc(0.4rem + env(safe-area-inset-bottom, 0px));
    z-index: 1040;
}

.mobile-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.15rem;
    color: var(--dva-text-muted);
    text-decoration: none;
    font-size: 0.7rem;
    padding: 0.25rem 0.5rem;
    transition: color 0.15s;
}

.mobile-nav-item i {
    font-size: 1.25rem;
}

.mobile-nav-item.active,
.mobile-nav-item:hover {
    color: var(--dva-primary);
}

/* ===== Sidebar Overlay (Mobile) ===== */
.sidebar-overlay {
    position: fixed;
    inset: 0;
    background: var(--dva-overlay-bg);
    z-index: 1035;
    display: none;
}

.sidebar-overlay.show {
    display: block;
}

/* ===== Responsive ===== */
@media (max-width: 767.98px) {
    .app-sidebar {
        transform: translateX(-100%);
    }
    .app-sidebar.show {
        transform: translateX(0);
    }
    .app-main {
        margin-left: 0;
    }
    .app-content {
        padding: 1rem;
        padding-bottom: 5rem;
    }
}

@media (min-width: 768px) {
    .app-mobile-nav {
        display: none !important;
    }
}

@media (max-width: 575.98px) {
    .page-header .d-flex {
        flex-direction: column;
        align-items: stretch !important;
        gap: 0.75rem;
    }
    .page-header .btn {
        width: 100%;
        text-align: center;
    }
    .page-header h1 {
        font-size: 1.4rem;
    }
}

@media (max-width: 767.98px) {
    .form-control-sm,
    .form-select-sm {
        font-size: 16px;
        min-height: 44px;
        padding: 0.5rem 0.75rem;
    }
    .btn-sm {
        min-height: 44px;
        min-width: 44px;
        padding: 0.5rem 0.75rem;
    }
}

/* ===== Guest Layout (Login) ===== */
.app-content-guest {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    background: var(--dva-login-bg);
}

.login-card {
    background: var(--dva-login-card-bg);
    border-radius: 0.75rem;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    padding: 2.5rem;
    width: 100%;
    max-width: 420px;
}

.login-card .login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-card .login-header img {
    width: 56px;
    height: 56px;
    border-radius: 12px;
}

.login-card .login-header i {
    font-size: 2.5rem;
    color: var(--dva-primary);
}

.login-card .login-header h1 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-top: 0.75rem;
    color: var(--dva-login-text);
}

.login-card .login-header p {
    color: var(--dva-text-muted);
    font-size: 0.9rem;
    margin: 0;
}

/* ===== Page Header ===== */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.page-header h1 {
    font-size: 1.5rem;
    font-weight: var(--dva-heading-weight);
    font-family: var(--dva-font-heading);
    margin: 0;
}

/* ===== KPI Cards ===== */
a.color-inherit { color: inherit; }
a.color-inherit:hover .kpi-card {
    border-color: var(--dva-primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.kpi-card {
    background: var(--dva-card-bg);
    border-radius: var(--dva-card-radius);
    border: 1px solid var(--dva-border);
    box-shadow: var(--dva-card-shadow);
    padding: 1.25rem;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    height: 100%;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.kpi-card .kpi-icon {
    width: 48px;
    height: 48px;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.kpi-card .kpi-icon.bg-primary-light { background: var(--dva-primary-light); color: var(--dva-primary); }
.kpi-card .kpi-icon.bg-success-light { background: #dcfce7; color: var(--dva-success); }
.kpi-card .kpi-icon.bg-warning-light { background: #fef3c7; color: var(--dva-warning); }
.kpi-card .kpi-icon.bg-danger-light  { background: #fee2e2; color: var(--dva-danger); }
.kpi-card .kpi-icon.bg-info-light    { background: #cffafe; color: var(--dva-info); }

.kpi-card .kpi-value {
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1;
    color: var(--dva-text);
}

.kpi-card .kpi-label {
    font-size: 0.8rem;
    color: var(--dva-text-muted);
    margin-top: 0.25rem;
}

.kpi-card.kpi-card-danger { border-color: var(--dva-danger); }
.kpi-card.kpi-card-danger .kpi-value { color: var(--dva-danger); }

/* ===== Bootstrap Card Override ===== */
.card {
    background-color: var(--dva-card-bg);
    border-color: var(--dva-border);
    border-radius: var(--dva-card-radius);
    box-shadow: var(--dva-card-shadow);
    color: var(--dva-text);
}
.card-header {
    background-color: var(--dva-table-header-bg);
    border-color: var(--dva-border);
    font-weight: 600;
}

/* ===== Content Cards ===== */
.content-card {
    background: var(--dva-card-bg);
    border-radius: var(--dva-card-radius);
    border: 1px solid var(--dva-border);
    box-shadow: var(--dva-card-shadow);
    margin-bottom: 1.5rem;
}

.content-card .card-header-custom {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--dva-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-weight: 600;
    font-size: 0.95rem;
}

.content-card .card-body-custom {
    padding: 1.25rem;
}

/* ===== Tables ===== */
.table-container {
    background: var(--dva-card-bg);
    border-radius: var(--dva-card-radius);
    border: 1px solid var(--dva-border);
    box-shadow: var(--dva-card-shadow);
    overflow: hidden;
}

.table-container .table {
    margin-bottom: 0;
    color: var(--dva-text);
}

.table-container .table th {
    background: var(--dva-table-header-bg);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.025em;
    color: var(--dva-text-muted);
    border-bottom-width: 1px;
    border-color: var(--dva-border);
    padding: 0.75rem 1rem;
    white-space: nowrap;
}

.table-container .table td {
    padding: 0.75rem 1rem;
    vertical-align: middle;
    font-size: 0.9rem;
    border-color: var(--dva-border);
}

.table-container .table tbody tr:hover {
    background: var(--dva-table-hover-bg);
}

/* ===== Status Badges ===== */
.badge.bg-secondary {
    background-color: var(--dva-badge-bg) !important;
    color: var(--dva-badge-text) !important;
}
.badge.bg-outline-secondary {
    background-color: var(--dva-badge-outline-bg) !important;
    color: var(--dva-badge-outline-text) !important;
    border: 1px solid var(--dva-badge-outline-border) !important;
}
.badge-status {
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.35em 0.65em;
    white-space: nowrap;
}
@media (max-width: 575.98px) {
    .badge-status {
        font-size: 0.65rem;
        padding: 0.25em 0.5em;
    }
}

/* ===== Filter Bar ===== */
.filter-bar {
    background: var(--dva-card-bg);
    border-radius: var(--dva-card-radius);
    border: 1px solid var(--dva-border);
    box-shadow: var(--dva-card-shadow);
    padding: 1rem 1.25rem;
    margin-bottom: 1rem;
}
.filter-bar .form-label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--dva-text-muted);
    margin-bottom: 0.25rem;
}
.filter-bar .form-select,
.filter-bar .form-control {
    font-size: 0.875rem;
}

/* ===== Detail Page ===== */
.detail-header {
    background: var(--dva-card-bg);
    border-radius: var(--dva-card-radius);
    border: 1px solid var(--dva-border);
    box-shadow: var(--dva-card-shadow);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}
.detail-header h1 {
    font-size: 1.35rem;
    font-weight: var(--dva-heading-weight);
    font-family: var(--dva-font-heading);
    margin: 0 0 0.5rem;
}
.detail-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    color: var(--dva-text-muted);
    font-size: 0.875rem;
}
.detail-meta-item {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}
.detail-section {
    background: var(--dva-card-bg);
    border-radius: var(--dva-card-radius);
    border: 1px solid var(--dva-border);
    box-shadow: var(--dva-card-shadow);
    padding: 1.25rem;
    margin-bottom: 1rem;
}
.detail-section h3 {
    font-size: 1rem;
    font-weight: var(--dva-heading-weight);
    font-family: var(--dva-font-heading);
    margin: 0 0 1rem;
}

/* ===== Empty State ===== */
.empty-state {
    text-align: center;
    padding: 3.5rem 1.5rem;
    color: var(--dva-text-muted);
}
.empty-state i {
    font-size: 2.5rem;
    opacity: 0.4;
    display: block;
    margin-bottom: 0.75rem;
}
.empty-state h3 {
    color: var(--dva-text-muted);
    font-size: 1.05rem;
    margin-bottom: 0.5rem;
}

/* ============================================================
   BRIEFING-DOMAIN-KOMPONENTEN
   ============================================================ */

/* ===== Sticky Progress (Kapitel-Ansicht) ===== */
.sticky-progress {
    position: sticky;
    top: var(--dva-topbar-height);
    background: var(--dva-card-bg);
    border: 1px solid var(--dva-border);
    border-radius: var(--dva-card-radius);
    padding: 0.75rem 1.25rem;
    z-index: 10;
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--dva-card-shadow);
}
.sticky-progress .progress {
    flex: 1;
    height: 8px;
}
.sticky-progress-text {
    font-size: 0.8125rem;
    color: var(--dva-text-muted);
    white-space: nowrap;
}

/* ===== Kapitel-Liste (Briefing-Übersicht) ===== */
.chapter-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.chapter-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    background: var(--dva-card-bg);
    border: 1px solid var(--dva-border);
    border-radius: var(--dva-card-radius);
    box-shadow: var(--dva-card-shadow);
    text-decoration: none;
    color: var(--dva-text);
    transition: border-color 0.15s, box-shadow 0.15s;
}
a.chapter-item:hover {
    border-color: var(--dva-primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}
.chapter-item.is-locked {
    opacity: 0.6;
    pointer-events: none;
}
.chapter-number {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    border-radius: 50%;
    background: var(--dva-primary-light);
    color: var(--dva-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
}
.chapter-item.is-done .chapter-number {
    background: #dcfce7;
    color: var(--dva-success);
}
.chapter-item.is-locked .chapter-number {
    background: var(--dva-table-header-bg);
    color: var(--dva-text-muted);
}
.chapter-title {
    flex: 1;
    font-weight: 500;
}

/* ===== Prose (Rich-Text-Inhalte) ===== */
.prose {
    color: var(--dva-text);
    line-height: 1.7;
    font-size: 1rem;
    max-width: 72ch;
}
.prose h2 {
    font-size: 1.4rem;
    margin: 1.75rem 0 0.75rem;
}
.prose h3 {
    font-size: 1.15rem;
    margin: 1.5rem 0 0.5rem;
}
.prose p { margin: 0 0 1rem; }
.prose ul, .prose ol { margin: 0 0 1rem 1.25rem; padding-left: 0.75rem; }
.prose li { margin-bottom: 0.35rem; }
.prose a { color: var(--dva-primary); }
.prose img { max-width: 100%; height: auto; border-radius: var(--dva-card-radius); }
.prose blockquote {
    border-left: 4px solid var(--dva-primary);
    background: var(--dva-table-header-bg);
    margin: 1rem 0;
    padding: 0.75rem 1rem;
    color: var(--dva-text-muted);
}
.prose table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}
.prose th, .prose td {
    border: 1px solid var(--dva-border);
    padding: 0.5rem 0.75rem;
    text-align: left;
}
.prose th { background: var(--dva-table-header-bg); }
.prose code {
    background: var(--dva-table-header-bg);
    padding: 0.15em 0.4em;
    border-radius: 4px;
    font-size: 0.875em;
}
.prose pre {
    background: #1e293b;
    color: #e2e8f0;
    padding: 1rem;
    border-radius: var(--dva-card-radius);
    overflow-x: auto;
}
.prose pre code { background: transparent; padding: 0; color: inherit; }

/* Media-Blöcke */
.content-media video,
.content-media audio,
.content-media iframe {
    max-width: 100%;
    border-radius: var(--dva-card-radius);
}
.content-media iframe {
    width: 100%;
    aspect-ratio: 16 / 9;
    border: 0;
}

/* ===== Quiz ===== */
.quiz-question {
    background: var(--dva-card-bg);
    border: 1px solid var(--dva-border);
    border-radius: var(--dva-card-radius);
    box-shadow: var(--dva-card-shadow);
    padding: 1.5rem;
    margin-bottom: 1.25rem;
}
.quiz-question-title {
    font-weight: 600;
    margin-bottom: 1rem;
}
.quiz-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1rem;
    border: 1px solid var(--dva-border);
    border-radius: var(--dva-card-radius);
    margin-bottom: 0.6rem;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
}
.quiz-option:hover {
    border-color: var(--dva-primary);
}
.quiz-option input { accent-color: var(--dva-primary); }
.quiz-option:has(input:checked) {
    border-color: var(--dva-primary);
    background: var(--dva-primary-light);
}
.quiz-option.is-correct {
    border-color: var(--dva-success);
    background: #dcfce7;
}
.quiz-option.is-wrong {
    border-color: var(--dva-danger);
    background: #fee2e2;
}

/* ===== Signature Pad ===== */
.signature-pad-wrapper {
    border: 1px dashed var(--dva-input-border);
    border-radius: var(--dva-card-radius);
    background: var(--dva-input-bg);
    overflow: hidden;
}
.signature-pad-wrapper canvas,
#signatureCanvas {
    display: block;
    width: 100%;
    height: 200px;
    touch-action: none;
    cursor: crosshair;
    background: #fff;
}
.quiz-feedback {
    padding: 0.5rem 0.85rem;
    border-radius: var(--dva-card-radius);
    font-weight: 500;
    margin-top: 0.75rem;
}
.matching-container select { flex: 1; }

/* ===== Theme-Vorschau (Einstellungen) ===== */
.setting-option { cursor: pointer; }
.setting-option:has(input:checked) .content-card {
    border-color: var(--dva-primary);
    border-width: 2px;
    box-shadow: 0 2px 12px rgba(var(--dva-primary-rgb), 0.18);
    background: var(--dva-primary-light);
}
.theme-preview-card {
    border-radius: 8px;
    overflow: hidden;
    height: 80px;
    margin-bottom: 0.75rem;
    position: relative;
}
.theme-preview-sidebar {
    position: absolute;
    left: 0; top: 0; bottom: 0;
    width: 30%;
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 8px 6px;
}
.theme-preview-sidebar span {
    display: block;
    height: 4px;
    border-radius: 2px;
    opacity: 0.6;
}
.theme-preview-main {
    position: absolute;
    left: 30%; top: 0; right: 0; bottom: 0;
    display: flex;
    flex-direction: column;
}
.theme-preview-topbar {
    height: 16px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}
.theme-preview-content {
    flex: 1;
    padding: 6px;
    display: flex;
    gap: 4px;
}
.theme-preview-content span {
    flex: 1;
    border-radius: 3px;
    opacity: 0.5;
}

/* ============================================================
   THEME 2: MITTERNACHT (Dark Mode)
   ============================================================ */
.theme-dark {
    --dva-primary: #818cf8;
    --dva-primary-dark: #6366f1;
    --dva-primary-light: rgba(129, 140, 248, 0.15);
    --dva-primary-rgb: 129, 140, 248;
    --dva-sidebar-bg: #0f172a;
    --dva-sidebar-hover: #1e293b;
    --dva-sidebar-text: #94a3b8;
    --dva-sidebar-text-active: #e2e8f0;
    --dva-sidebar-width: 260px;
    --dva-sidebar-border: rgba(255, 255, 255, 0.06);
    --dva-sidebar-brand: #e2e8f0;
    --dva-topbar-height: 56px;
    --dva-topbar-bg: #1e293b;
    --dva-content-bg: #0f172a;
    --dva-card-bg: #1e293b;
    --dva-card-radius: 0.75rem;
    --dva-card-shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(255, 255, 255, 0.03);
    --dva-border: #334155;
    --dva-text: #e2e8f0;
    --dva-text-muted: #94a3b8;
    --dva-table-header-bg: #1a2332;
    --dva-table-hover-bg: #263345;
    --dva-input-bg: #1e293b;
    --dva-input-border: #475569;
    --dva-input-text: #e2e8f0;
    --dva-mobile-nav-bg: #1e293b;
    --dva-overlay-bg: rgba(0, 0, 0, 0.7);
    --dva-success: #4ade80;
    --dva-warning: #fbbf24;
    --dva-danger: #f87171;
    --dva-info: #22d3ee;
    --dva-font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --dva-font-heading: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --dva-heading-weight: 700;
    --dva-login-bg: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #0f172a 100%);
    --dva-badge-bg: #64748b;
    --dva-badge-text: #ffffff;
    --dva-badge-outline-text: #94a3b8;
    --dva-badge-outline-border: #475569;
    --dva-login-card-bg: #1e293b;
    --dva-login-text: #e2e8f0;
    color-scheme: dark;
}
.theme-dark .form-control,
.theme-dark .form-select {
    background-color: var(--dva-input-bg);
    border-color: var(--dva-input-border);
    color: var(--dva-input-text);
}
.theme-dark .form-control:focus,
.theme-dark .form-select:focus {
    background-color: var(--dva-input-bg);
    border-color: var(--dva-primary);
    color: var(--dva-input-text);
    box-shadow: 0 0 0 0.2rem rgba(var(--dva-primary-rgb), 0.25);
}
.theme-dark .form-control::placeholder { color: #64748b; }
.theme-dark .form-label { color: var(--dva-text); }
.theme-dark .btn-primary {
    background-color: var(--dva-primary);
    border-color: var(--dva-primary);
    color: #0f172a;
}
.theme-dark .btn-primary:hover {
    background-color: var(--dva-primary-dark);
    border-color: var(--dva-primary-dark);
    color: #0f172a;
}
.theme-dark .btn-outline-primary { color: var(--dva-primary); border-color: var(--dva-primary); }
.theme-dark .btn-outline-primary:hover { background-color: var(--dva-primary); border-color: var(--dva-primary); color: #0f172a; }
.theme-dark .btn-outline-secondary { color: #94a3b8; border-color: #475569; }
.theme-dark .btn-outline-secondary:hover { background-color: #475569; border-color: #475569; color: #e2e8f0; }
.theme-dark .btn-outline-danger { color: #f87171; border-color: #f87171; }
.theme-dark .btn-outline-danger:hover { background-color: #f87171; border-color: #f87171; color: #0f172a; }
.theme-dark .btn-success { background-color: #4ade80; border-color: #4ade80; color: #0f172a; }
.theme-dark .btn-success:hover { background-color: #22c55e; border-color: #22c55e; color: #0f172a; }
.theme-dark .btn-outline-success { color: #4ade80; border-color: #4ade80; }
.theme-dark .btn-outline-success:hover { background-color: #4ade80; border-color: #4ade80; color: #0f172a; }
.theme-dark .dropdown-menu { background-color: #1e293b; border-color: #334155; }
.theme-dark .dropdown-item { color: #e2e8f0; }
.theme-dark .dropdown-item:hover { background-color: #334155; color: #f1f5f9; }
.theme-dark .dropdown-item-text { color: #94a3b8 !important; }
.theme-dark .dropdown-divider { border-color: #334155; }
.theme-dark .btn-link.text-dark { color: var(--dva-text) !important; }
.theme-dark .table {
    color: var(--dva-text);
    --bs-table-bg: transparent;
    --bs-table-color: var(--dva-text);
    --bs-table-hover-bg: var(--dva-table-hover-bg);
    --bs-table-hover-color: var(--dva-text);
}
.theme-dark .table td,
.theme-dark .table th { border-color: var(--dva-border); color: var(--dva-text); }
.theme-dark .table thead th { color: var(--dva-text-muted); }
.theme-dark .card-header { background-color: #1a2332; }
.theme-dark .modal-content { background-color: var(--dva-card-bg); border-color: var(--dva-border); color: var(--dva-text); }
.theme-dark .modal-header,
.theme-dark .modal-footer { border-color: var(--dva-border); }
.theme-dark .btn-close { filter: invert(1) grayscale(100%) brightness(200%); }
.theme-dark hr { border-color: var(--dva-border); }
.theme-dark a { color: var(--dva-primary); }
.theme-dark .text-dark { color: var(--dva-text) !important; }
.theme-dark .text-muted { color: var(--dva-text-muted) !important; }
.theme-dark .text-danger { color: #f87171 !important; }
.theme-dark .text-warning { color: #fbbf24 !important; }
.theme-dark .text-primary { color: #818cf8 !important; }
.theme-dark .text-success { color: #4ade80 !important; }
.theme-dark .text-info { color: #22d3ee !important; }
.theme-dark .kpi-card .kpi-icon.bg-primary-light { background: rgba(129, 140, 248, 0.15); color: #818cf8; }
.theme-dark .kpi-card .kpi-icon.bg-success-light { background: rgba(74, 222, 128, 0.15); color: #4ade80; }
.theme-dark .kpi-card .kpi-icon.bg-warning-light { background: rgba(251, 191, 36, 0.15); color: #fbbf24; }
.theme-dark .kpi-card .kpi-icon.bg-danger-light { background: rgba(248, 113, 113, 0.15); color: #f87171; }
.theme-dark .kpi-card .kpi-icon.bg-info-light { background: rgba(34, 211, 238, 0.15); color: #22d3ee; }
.theme-dark .chapter-item.is-done .chapter-number { background: rgba(74, 222, 128, 0.15); color: #4ade80; }
.theme-dark .quiz-option.is-correct { background: rgba(74, 222, 128, 0.12); }
.theme-dark .quiz-option.is-wrong { background: rgba(248, 113, 113, 0.12); }
.theme-dark .login-card { box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5); }
.theme-dark .login-card .login-header p { color: #94a3b8; }
.theme-dark .pagination .page-link { background-color: var(--dva-card-bg); border-color: var(--dva-border); color: var(--dva-primary); }
.theme-dark .pagination .page-item.active .page-link { background-color: var(--dva-primary); border-color: var(--dva-primary); color: #0f172a; }
.theme-dark .pagination .page-item.disabled .page-link { background-color: #1a2332; border-color: var(--dva-border); color: #475569; }
.theme-dark .alert { border-color: var(--dva-border); }
.theme-dark .alert-success { background-color: rgba(74, 222, 128, 0.1); color: #4ade80; }
.theme-dark .alert-danger { background-color: rgba(248, 113, 113, 0.1); color: #f87171; }
.theme-dark .alert-warning { background-color: rgba(251, 191, 36, 0.1); color: #fbbf24; }
.theme-dark .alert-info { background-color: rgba(34, 211, 238, 0.1); color: #22d3ee; }
.theme-dark .prose blockquote,
.theme-dark .prose code,
.theme-dark .prose th { background: var(--dva-table-header-bg); }

/* ============================================================
   THEME 3: NATUR (Waldgrün / Erdtöne)
   ============================================================ */
.theme-nature {
    --dva-primary: #059669;
    --dva-primary-dark: #047857;
    --dva-primary-light: #d1fae5;
    --dva-primary-rgb: 5, 150, 105;
    --dva-sidebar-bg: #1a2e1a;
    --dva-sidebar-hover: #2d4a2d;
    --dva-sidebar-text: #a7c4a0;
    --dva-sidebar-text-active: #ecfdf5;
    --dva-sidebar-width: 260px;
    --dva-sidebar-border: rgba(167, 196, 160, 0.15);
    --dva-sidebar-brand: #ecfdf5;
    --dva-topbar-height: 56px;
    --dva-topbar-bg: #fefdf8;
    --dva-content-bg: #f5f0e8;
    --dva-card-bg: #fefdf8;
    --dva-card-radius: 0.75rem;
    --dva-card-shadow: 0 1px 4px rgba(120, 100, 60, 0.08);
    --dva-border: #d6cbb2;
    --dva-text: #3d3322;
    --dva-text-muted: #7c6f5a;
    --dva-table-header-bg: #f5f0e8;
    --dva-table-hover-bg: #f0ead9;
    --dva-input-bg: #fefdf8;
    --dva-input-border: #d6cbb2;
    --dva-input-text: #3d3322;
    --dva-mobile-nav-bg: #fefdf8;
    --dva-overlay-bg: rgba(61, 51, 34, 0.5);
    --dva-success: #16a34a;
    --dva-warning: #ca8a04;
    --dva-danger: #dc2626;
    --dva-info: #0e7490;
    --dva-font-family: "Source Sans 3", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --dva-font-heading: Georgia, "Times New Roman", serif;
    --dva-heading-weight: 700;
    --dva-login-bg: linear-gradient(135deg, #1a2e1a 0%, #2d4a2d 50%, #1a2e1a 100%);
    --dva-badge-bg: #6b5e48;
    --dva-badge-text: #ffffff;
    --dva-badge-outline-text: #6b5e48;
    --dva-badge-outline-border: #b8a88e;
    --dva-login-card-bg: #fefdf8;
    --dva-login-text: #3d3322;
}
.theme-nature .form-control,
.theme-nature .form-select { border-color: var(--dva-input-border); background-color: var(--dva-input-bg); }
.theme-nature .form-control:focus,
.theme-nature .form-select:focus { border-color: var(--dva-primary); box-shadow: 0 0 0 0.2rem rgba(var(--dva-primary-rgb), 0.2); }
.theme-nature .btn-primary { background-color: var(--dva-primary); border-color: var(--dva-primary); }
.theme-nature .btn-primary:hover { background-color: var(--dva-primary-dark); border-color: var(--dva-primary-dark); }
.theme-nature .btn-outline-primary { color: var(--dva-primary); border-color: var(--dva-primary); }
.theme-nature .btn-outline-primary:hover { background-color: var(--dva-primary); border-color: var(--dva-primary); color: #fff; }
.theme-nature .btn-outline-secondary { color: #5c5242; border-color: #a89a80; }
.theme-nature .btn-outline-secondary:hover { background-color: #5c5242; border-color: #5c5242; color: #fefdf8; }
.theme-nature .sidebar-nav-item.active { border-left-color: #4ade80; }
.theme-nature .sidebar-brand i { color: #4ade80; }
.theme-nature .kpi-card .kpi-icon.bg-primary-light { background: #d1fae5; color: #059669; }
.theme-nature .table { --bs-table-hover-bg: var(--dva-table-hover-bg); }
.theme-nature a:not(.btn):not(.sidebar-nav-item):not(.sidebar-brand):not(.topbar-breadcrumb-link):not(.mobile-nav-item):not(.chapter-item) { color: var(--dva-primary); }

/* ============================================================
   THEME 4: OZEAN (Marine / Blauweiß)
   ============================================================ */
.theme-ocean {
    --dva-primary: #0369a1;
    --dva-primary-dark: #075985;
    --dva-primary-light: #e0f2fe;
    --dva-primary-rgb: 3, 105, 161;
    --dva-sidebar-bg: #ffffff;
    --dva-sidebar-hover: #f0f9ff;
    --dva-sidebar-text: #64748b;
    --dva-sidebar-text-active: #0369a1;
    --dva-sidebar-width: 250px;
    --dva-sidebar-border: #e0f2fe;
    --dva-sidebar-brand: #0369a1;
    --dva-topbar-height: 60px;
    --dva-topbar-bg: linear-gradient(135deg, #0369a1 0%, #0284c7 100%);
    --dva-content-bg: #f0f9ff;
    --dva-card-bg: #ffffff;
    --dva-card-radius: 0.75rem;
    --dva-card-shadow: 0 1px 3px rgba(3, 105, 161, 0.06), 0 4px 12px rgba(3, 105, 161, 0.04);
    --dva-border: #bae6fd;
    --dva-text: #0c4a6e;
    --dva-text-muted: #64748b;
    --dva-table-header-bg: #f0f9ff;
    --dva-table-hover-bg: #e0f2fe;
    --dva-input-bg: #ffffff;
    --dva-input-border: #bae6fd;
    --dva-input-text: #0c4a6e;
    --dva-mobile-nav-bg: #ffffff;
    --dva-overlay-bg: rgba(12, 74, 110, 0.4);
    --dva-success: #059669;
    --dva-warning: #d97706;
    --dva-danger: #dc2626;
    --dva-info: #0891b2;
    --dva-font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --dva-font-heading: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --dva-heading-weight: 700;
    --dva-login-bg: linear-gradient(135deg, #0369a1 0%, #0ea5e9 50%, #0369a1 100%);
    --dva-badge-bg: #475569;
    --dva-badge-text: #ffffff;
    --dva-badge-outline-text: #475569;
    --dva-badge-outline-border: #94a3b8;
    --dva-login-card-bg: #ffffff;
    --dva-login-text: #0c4a6e;
}
.theme-ocean .app-sidebar { border-right: 1px solid #e0f2fe; box-shadow: 2px 0 8px rgba(3, 105, 161, 0.06); }
.theme-ocean .sidebar-nav-item { border-radius: 0 8px 8px 0; margin-right: 0.5rem; }
.theme-ocean .sidebar-nav-item:hover { background: #f0f9ff; color: #0369a1; }
.theme-ocean .sidebar-nav-item.active { background: #e0f2fe; color: #0369a1; border-left-color: #0369a1; font-weight: 600; }
.theme-ocean .sidebar-brand { font-weight: 700; }
.theme-ocean .sidebar-brand i { color: #0ea5e9; }
.theme-ocean .app-topbar { background: var(--dva-topbar-bg); border-bottom: none; box-shadow: 0 2px 8px rgba(3, 105, 161, 0.12); }
.theme-ocean .topbar-toggle,
.theme-ocean .topbar-title,
.theme-ocean .topbar-breadcrumb-current { color: #ffffff; }
.theme-ocean .topbar-breadcrumb-link { color: #e0f2fe; }
.theme-ocean .topbar-breadcrumb-link:hover { color: #ffffff; }
.theme-ocean .topbar-breadcrumb-sep { color: rgba(255, 255, 255, 0.5); }
.theme-ocean .topbar-back-desktop { color: #e0f2fe; }
.theme-ocean .topbar-back-desktop:hover { background-color: rgba(255, 255, 255, 0.2); color: #ffffff; }
.theme-ocean .topbar-actions .btn-link,
.theme-ocean .topbar-actions .dropdown-toggle { color: #ffffff !important; }
.theme-ocean .form-control,
.theme-ocean .form-select { border-color: var(--dva-input-border); }
.theme-ocean .form-control:focus,
.theme-ocean .form-select:focus { border-color: var(--dva-primary); box-shadow: 0 0 0 0.2rem rgba(var(--dva-primary-rgb), 0.15); }
.theme-ocean .btn-primary { background-color: var(--dva-primary); border-color: var(--dva-primary); }
.theme-ocean .btn-primary:hover { background-color: var(--dva-primary-dark); border-color: var(--dva-primary-dark); }
.theme-ocean .btn-outline-primary { color: var(--dva-primary); border-color: var(--dva-primary); }
.theme-ocean .btn-outline-primary:hover { background-color: var(--dva-primary); border-color: var(--dva-primary); color: #fff; }
.theme-ocean .btn-outline-secondary { color: #475569; border-color: #94a3b8; }
.theme-ocean .btn-outline-secondary:hover { background-color: #475569; border-color: #475569; color: #fff; }
.theme-ocean .kpi-card .kpi-icon.bg-primary-light { background: #e0f2fe; color: #0369a1; }
.theme-ocean .sidebar-footer .sidebar-user { color: #64748b; }
.theme-ocean .table { --bs-table-hover-bg: var(--dva-table-hover-bg); }
.theme-ocean a:not(.btn):not(.sidebar-nav-item):not(.sidebar-brand):not(.topbar-breadcrumb-link):not(.mobile-nav-item):not(.chapter-item) { color: var(--dva-primary); }