:root {
    /* Color Palette - Premium Dark Theme */
    --bg-app: #0b0f19;
    --bg-sidebar: #0f1524;
    --bg-card: #141c2f;
    --border-color: rgba(255, 255, 255, 0.08);
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --accent-color: #3b82f6;
    --accent-glow: rgba(59, 130, 246, 0.15);
    --code-bg: #1e293b;
    --code-text: #38bdf8;
    
    /* Alerts */
    --note-bg: rgba(59, 130, 246, 0.1);
    --note-border: #3b82f6;
    --tip-bg: rgba(16, 185, 129, 0.1);
    --tip-border: #10b981;
    --warning-bg: rgba(245, 158, 11, 0.1);
    --warning-border: #f59e0b;
    --danger-bg: rgba(239, 68, 68, 0.1);
    --danger-border: #ef4444;

    /* Spacing & Borders */
    --sidebar-width: 280px;
    --toc-width: 240px;
    --border-radius: 12px;
    --transition-speed: 0.25s;
    --font-family: 'Plus Jakarta Sans', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

.light-theme {
    /* Color Palette - Premium Light Theme */
    --bg-app: #f9fafb;
    --bg-sidebar: #f3f4f6;
    --bg-card: #ffffff;
    --border-color: rgba(0, 0, 0, 0.08);
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-muted: #9ca3af;
    --accent-color: #2563eb;
    --accent-glow: rgba(37, 99, 235, 0.1);
    --code-bg: #f3f4f6;
    --code-text: #0969da;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    background: radial-gradient(circle at 85% 10%, rgba(59, 130, 246, 0.06), transparent 35%),
                radial-gradient(circle at 15% 85%, rgba(139, 92, 246, 0.04), transparent 35%),
                var(--bg-app);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* Sidebar Styling */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: background-color var(--transition-speed);
}

.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    font-size: 28px;
    animation: pulse-glow 3s infinite ease-in-out;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-weight: 700;
    font-size: 16px;
    letter-spacing: 0.5px;
}

.logo-subtitle {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    font-weight: 600;
}

@keyframes pulse-glow {
    0%, 100% { transform: scale(1); filter: drop-shadow(0 0 2px rgba(59, 130, 246, 0)); }
    50% { transform: scale(1.05); filter: drop-shadow(0 0 10px rgba(59, 130, 246, 0.6)); }
}

.search-container {
    padding: 16px 24px;
    position: relative;
}

.search-container input {
    width: 100%;
    padding: 10px 16px 10px 36px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 13px;
    outline: none;
    transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
}

.search-container input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.search-icon {
    position: absolute;
    left: 36px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 14px;
    color: var(--text-muted);
}

.sidebar-nav {
    flex-grow: 1;
    overflow-y: auto;
    padding: 0 16px 24px 16px;
}

.nav-loading {
    padding: 16px;
    color: var(--text-muted);
    font-size: 13px;
    text-align: center;
}

.nav-group {
    margin-bottom: 20px;
}

.nav-group-title {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    padding: 8px 12px;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 13px;
    text-decoration: none;
    cursor: pointer;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    margin-bottom: 2px;
}

.nav-item:hover {
    background-color: var(--accent-glow);
    color: var(--accent-color);
}

.nav-item.active {
    background-color: var(--accent-color);
    color: #ffffff;
    font-weight: 600;
}

/* Main Content Styling */
.main-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.top-header {
    height: 64px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    flex-shrink: 0;
}

.breadcrumb {
    font-size: 14px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.breadcrumb span {
    display: flex;
    align-items: center;
    gap: 8px;
}

.breadcrumb span::after {
    content: "/";
    color: var(--text-muted);
    font-size: 12px;
}

.breadcrumb span:last-child::after {
    display: none;
}

.theme-toggle-btn {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-speed);
}

.theme-toggle-btn:hover {
    background-color: var(--border-color);
}

.content-body {
    display: flex;
    flex-grow: 1;
    overflow: hidden;
}

.markdown-body {
    flex-grow: 1;
    overflow-y: auto;
    padding: 48px 64px;
    max-width: 860px;
    line-height: 1.625;
    font-size: 15px;
}

.welcome-screen {
    display: flex;
    flex-direction: column;
    padding: 12px 0 24px 0;
    gap: 28px;
    color: var(--text-secondary);
}

.welcome-header {
    text-align: center;
    max-width: 680px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
}

.welcome-badge {
    background-color: var(--accent-glow);
    color: var(--accent-color);
    font-size: 11px;
    font-weight: 700;
    padding: 6px 12px;
    border-radius: 20px;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.welcome-header h1 {
    font-size: 32px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--text-primary) 30%, var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 8px;
}

.welcome-header p {
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-secondary);
}

.portal-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-top: 12px;
    width: 100%;
}

.portal-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px;
    cursor: pointer;
    transition: transform var(--transition-speed) cubic-bezier(0.16, 1, 0.3, 1),
                border-color var(--transition-speed),
                box-shadow var(--transition-speed);
    display: flex;
    flex-direction: column;
    gap: 10px;
    position: relative;
    overflow: hidden;
}

.portal-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-color), transparent);
    opacity: 0;
    transition: opacity var(--transition-speed);
}

.portal-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-color);
    box-shadow: 0 12px 24px -10px var(--accent-glow);
}

.portal-card:hover::before {
    opacity: 1;
}

.card-icon {
    font-size: 28px;
}

.card-title {
    font-weight: 700;
    font-size: 15px;
    color: var(--text-primary);
}

.card-desc {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.4;
}

/* Right Sidebar TOC */
.toc-sidebar {
    width: var(--toc-width);
    border-left: 1px solid var(--border-color);
    padding: 48px 24px;
    overflow-y: auto;
    flex-shrink: 0;
}

.toc-title {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.8px;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 16px;
}

.toc-nav {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toc-link {
    font-size: 13px;
    color: var(--text-secondary);
    text-decoration: none;
    cursor: pointer;
    transition: color var(--transition-speed);
    line-height: 1.4;
}

.toc-link:hover {
    color: var(--accent-color);
}

.toc-link.h3 {
    padding-left: 12px;
    font-size: 12px;
}

.toc-empty {
    font-size: 12px;
    color: var(--text-muted);
    font-style: italic;
}

/* Markdown Elements Styling */
.markdown-body h1 {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
}

.markdown-body h2 {
    font-size: 22px;
    font-weight: 700;
    margin-top: 36px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.markdown-body h3 {
    font-size: 18px;
    font-weight: 600;
    margin-top: 24px;
    margin-bottom: 12px;
}

.markdown-body p {
    margin-bottom: 16px;
    color: var(--text-secondary);
}

.markdown-body ul, .markdown-body ol {
    margin-bottom: 16px;
    padding-left: 24px;
    color: var(--text-secondary);
}

.markdown-body li {
    margin-bottom: 6px;
}

.markdown-body code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background-color: var(--code-bg);
    color: var(--code-text);
    padding: 3px 6px;
    border-radius: 4px;
}

.markdown-body pre {
    background-color: var(--code-bg);
    padding: 16px;
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}

.markdown-body pre code {
    background-color: transparent;
    padding: 0;
    color: #f3f4f6;
    border-radius: 0;
}

.markdown-body blockquote {
    border-left: 4px solid var(--accent-color);
    padding: 12px 20px;
    background-color: rgba(59, 130, 246, 0.05);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    margin-bottom: 20px;
}

.markdown-body hr {
    height: 1px;
    background-color: var(--border-color);
    border: none;
    margin: 32px 0;
}

/* Alert Boxes (GitHub / Custom style) */
.alert-box {
    padding: 16px;
    margin-bottom: 20px;
    border-radius: var(--border-radius);
    border-left: 4px solid transparent;
}

.alert-box.note {
    background-color: var(--note-bg);
    border-color: var(--note-border);
}

.alert-box.tip {
    background-color: var(--tip-bg);
    border-color: var(--tip-border);
}

.alert-box.warning {
    background-color: var(--warning-bg);
    border-color: var(--warning-border);
}

.alert-box.danger {
    background-color: var(--danger-bg);
    border-color: var(--danger-border);
}

.alert-title {
    font-weight: 700;
    font-size: 13px;
    margin-bottom: 6px;
    text-transform: uppercase;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background-color: var(--text-muted);
}

/* Markdown Specific Enhancements */
.markdown-body a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color var(--transition-speed);
}

.markdown-body a:hover {
    text-decoration: underline;
}

.markdown-body img {
    max-width: 100%;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    margin: 16px 0;
}

.markdown-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 14px;
    text-align: left;
}

.markdown-body th {
    font-weight: 600;
    padding: 12px 16px;
    background-color: var(--bg-card);
    border-bottom: 2px solid var(--border-color);
    color: var(--text-primary);
}

.markdown-body td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.markdown-body tr:hover td {
    background-color: rgba(255, 255, 255, 0.015);
}

.light-theme .markdown-body tr:hover td {
    background-color: rgba(0, 0, 0, 0.015);
}

/* Sidebar Glassmorphic Feel */
.sidebar {
    background-color: rgba(15, 21, 36, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.light-theme .sidebar {
    background-color: rgba(243, 244, 246, 0.85);
}

.top-header {
    background-color: rgba(11, 15, 25, 0.8);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.light-theme .top-header {
    background-color: rgba(249, 250, 251, 0.8);
}

/* --- Mobile & Responsive Styling --- */

.header-left {
    display: flex;
    align-items: center;
}

.sidebar-toggle-btn {
    display: none; /* Hidden on desktop */
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 36px;
    height: 36px;
    border-radius: 8px;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-speed);
    margin-right: 12px;
    padding: 0;
}

.sidebar-toggle-btn:hover {
    background-color: var(--border-color);
}

.sidebar-toggle-btn .toggle-icon {
    font-size: 20px;
    line-height: 1;
}

.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(11, 15, 25, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 99;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-speed) ease;
}

.sidebar-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

@media (max-width: 1024px) {
    /* Hide TOC on smaller screens */
    .toc-sidebar {
        display: none;
    }
    
    .markdown-body {
        max-width: 100%;
        padding: 32px 48px;
    }
}

/* Monetra Validation Dashboard Styling */
.validation-dashboard-card {
    background: linear-gradient(135deg, var(--bg-card) 0%, rgba(20, 28, 47, 0.7) 100%);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 28px;
    margin-top: 40px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
    position: relative;
    overflow: hidden;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.validation-dashboard-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.03) 0%, transparent 60%);
    pointer-events: none;
}

.validation-dashboard-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
    border-color: rgba(59, 130, 246, 0.2);
}

.dashboard-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.dashboard-icon {
    font-size: 32px;
    background: rgba(59, 130, 246, 0.1);
    padding: 10px;
    border-radius: 12px;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.dashboard-title-group {
    flex-grow: 1;
}

.dashboard-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.dashboard-subtitle {
    font-size: 13px;
    color: var(--text-secondary);
}

.dashboard-action-btn {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    color: #ffffff;
    border: none;
    padding: 10px 18px;
    border-radius: var(--border-radius);
    font-family: var(--font-family);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
    transition: transform 0.2s, box-shadow 0.2s;
}

.dashboard-action-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(59, 130, 246, 0.4);
}

.dashboard-action-btn:active {
    transform: translateY(0);
}

.dashboard-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
    margin-bottom: 28px;
}

.stat-box {
    background-color: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    padding: 20px;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    position: relative;
}

.light-theme .stat-box {
    background-color: rgba(0, 0, 0, 0.01);
}

.stat-label {
    font-size: 12px;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.stat-target, .stat-desc {
    font-size: 11px;
    color: var(--text-muted);
}

.progress-bar-container {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.progress-bar-labels {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
}

.progress-bar-track {
    height: 12px;
    background-color: var(--code-bg);
    border-radius: 6px;
    overflow: hidden;
    position: relative;
    border: 1px solid var(--border-color);
}

.progress-bar-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #3b82f6 0%, #10b981 100%);
    border-radius: 6px;
    box-shadow: 0 0 8px rgba(16, 185, 129, 0.5);
    transition: width 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.validation-status-text {
    font-size: 12px;
    color: var(--text-muted);
    font-style: italic;
    margin-top: 4px;
}

.simulation-form-container {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    animation: slideDown 0.3s ease-out;
}

.simulation-form-container h3 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.form-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.form-row input {
    flex: 1;
    min-width: 150px;
    padding: 10px 14px;
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 13px;
    outline: none;
    transition: border-color 0.2s;
}

.light-theme .form-row input {
    background-color: rgba(0, 0, 0, 0.02);
}

.form-row input:focus {
    border-color: var(--accent-color);
}

.form-btn {
    background-color: #10b981;
    color: #ffffff;
    border: none;
    padding: 10px 18px;
    border-radius: var(--border-radius);
    font-family: var(--font-family);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

.form-btn:hover {
    background-color: #059669;
}

.simulation-feedback {
    font-size: 12px;
    margin-top: 8px;
    font-weight: 500;
}

.simulation-feedback.success {
    color: #10b981;
}

.simulation-feedback.error {
    color: #ef4444;
}

.hidden {
    display: none !important;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
    .sidebar-toggle-btn {
        display: flex; /* Show toggle on mobile */
    }
    
    .sidebar {
        position: fixed;
        top: 0;
        left: -var(--sidebar-width);
        height: 100vh;
        z-index: 100;
        transition: transform var(--transition-speed) cubic-bezier(0.16, 1, 0.3, 1),
                    background-color var(--transition-speed);
        box-shadow: none;
    }
    
    .sidebar.active {
        transform: translateX(var(--sidebar-width));
        box-shadow: 10px 0 30px rgba(0, 0, 0, 0.25);
    }
    
    .light-theme .sidebar.active {
        box-shadow: 10px 0 30px rgba(0, 0, 0, 0.08);
    }
    
    .top-header {
        padding: 0 16px;
    }
    
    .markdown-body {
        padding: 24px 16px;
    }
    
    .welcome-header h1 {
        font-size: 26px;
    }
    
    .welcome-header p {
        font-size: 13px;
    }
    
    .portal-grid {
        grid-template-columns: 1fr;
    }
}