/* ========================================
   CRx Foundations - Styles
   ======================================== */

:root {
    /* Draw.io Color Palette */
    --primary: #6C8EBF;           /* Blue stroke */
    --primary-light: #DAE8FC;     /* Blue fill */
    --primary-dark: #5A7AA8;      /* Blue darker */
    --accent: #9673A6;            /* Purple stroke */
    --accent-light: #E1D5E7;      /* Purple fill */
    --surface: #ffffff;
    --background: #F5F5F5;        /* Grey fill */
    --text-main: #000000;         /* Black text */
    --text-sub: #666666;          /* Grey stroke */
    --border: #e2e8f0;            /* Light grey */
    
    /* Level Colors */
    --level-novice: #82B366;      /* Green stroke */
    --level-novice-bg: #D5E8D4;   /* Green fill */
    --level-intermediate: #6C8EBF; /* Blue stroke */
    --level-intermediate-bg: #DAE8FC; /* Blue fill */
    --level-advanced: #9673A6;    /* Purple stroke */
    --level-advanced-bg: #E1D5E7; /* Purple fill */
    
    /* Domain Colors */
    --domain-history: #D6B656;    /* Yellow stroke */
    --domain-history-bg: #FFF2CC; /* Yellow fill */
    --domain-investigations: #D6B656;
    --domain-investigations-bg: #FFF2CC;
    --domain-pathophysiology: #82B366;
    --domain-pathophysiology-bg: #D5E8D4;
    --domain-pharmacology: #6C8EBF;
    --domain-pharmacology-bg: #DAE8FC;
    --domain-physiology: #82B366;
    --domain-physiology-bg: #D5E8D4;
    
    /* Semantic Colors */
    --danger: #B85450;            /* Pink stroke (red flags) */
    --danger-bg: #F8CECC;         /* Pink fill */
    --warning: #D79B00;           /* Amber stroke */
    --warning-bg: #FFE6CC;        /* Amber fill */
    --success: #82B366;           /* Green */
    --reasoning: #9673A6;         /* Purple (reasoning) */
    
    /* Typography */
    --font-stack: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'Courier New', monospace;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Layout */
    --header-height: 80px;
    --filters-height: 60px;
    --sidebar-width: 300px;
    --detail-drawer-width: 600px;
    --overlay-bg: rgba(0, 0, 0, 0.5); /* Dimmed overlay */
}

/* ========================================
   Reset & Base
   ======================================== */

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

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-stack);
    background-color: var(--background);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

mark {
    background-color: #FFE6CC; /* Amber fill from Draw.io palette */
    color: var(--text-main);
    padding: 0.1em 0.2em;
    border-radius: 2px;
    font-weight: 600;
}

/* Screen reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ========================================
   Header
   ======================================== */

.app-header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    height: var(--header-height);
    display: flex;
    align-items: center;
    padding: 0 var(--spacing-lg);
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    width: 100%;
}

.logo-section {
    display: flex;
    flex-direction: column;
    min-width: 180px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-dark);
    line-height: 1.2;
}

.tagline {
    font-size: 0.75rem;
    color: var(--text-sub);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nav-controls {
    display: flex;
    gap: var(--spacing-sm);
}

.nav-btn {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: 6px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-main);
}

.nav-btn:hover:not(:disabled) {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
}

.nav-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.search-container {
    flex: 1;
    position: relative;
    max-width: 500px;
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-sub);
    pointer-events: none;
}

#searchInput {
    width: 100%;
    padding: 0.6rem 1rem 0.6rem 2.5rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--background);
    font-size: 0.95rem;
    transition: all 0.2s;
}

#searchInput:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-light);
}

.pack-selector-container {
    min-width: 200px;
}

.pack-selector {
    width: 100%;
    padding: 0.6rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--primary-light);
    color: var(--primary-dark);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
}

.pack-selector:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.1);
}

.header-actions {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

/* Toggle Switch */
.toggle-switch {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    user-select: none;
}

.toggle-switch input {
    position: absolute;
    opacity: 0;
}

.toggle-slider {
    position: relative;
    width: 44px;
    height: 24px;
    background: var(--border);
    border-radius: 12px;
    transition: background 0.3s;
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: white;
    top: 3px;
    left: 3px;
    transition: transform 0.3s;
}

.toggle-switch input:checked + .toggle-slider {
    background: var(--primary);
}

.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(20px);
}

.toggle-label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-main);
}

/* ========================================
   Filters Bar
   ======================================== */

.filters-bar {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    height: var(--filters-height);
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    overflow-x: auto;
    z-index: 90;
}

.breadcrumbs {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.85rem;
    color: var(--text-sub);
    min-width: 200px;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
}

.breadcrumb-item:not(:last-child)::after {
    content: '›';
    margin-left: var(--spacing-sm);
    color: var(--border);
}

.filter-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.filter-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-sub);
    font-weight: 700;
    white-space: nowrap;
}

.chip-group {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.filter-chip {
    padding: 0.3rem 0.8rem;
    border-radius: 999px;
    font-size: 0.85rem;
    cursor: pointer;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-sub);
    transition: all 0.2s;
    user-select: none;
    white-space: nowrap;
}

.filter-chip:hover {
    background: var(--background);
    border-color: var(--primary);
}

.filter-chip.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.filter-divider {
    width: 1px;
    height: 24px;
    background: var(--border);
}

.clear-filters-btn {
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-sub);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
    margin-left: auto;
}

.clear-filters-btn:hover {
    background: var(--danger);
    color: white;
    border-color: var(--danger);
}

/* ========================================
   Main Layout
   ======================================== */

.app-main {
    height: calc(100vh - var(--header-height) - var(--filters-height));
    display: flex;
    overflow: hidden;
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-right {
    position: fixed;
    top: 0;
    right: 0;
    width: var(--detail-drawer-width);
    height: 100vh;
    background: var(--surface);
    border-left: 1px solid var(--border);
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), width 0.3s;
    z-index: 3000; /* Above overlay */
    box-shadow: var(--shadow-lg);
}

.sidebar-right.full-width {
    width: 100vw;
}

/* Detail Overlay */
.detail-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--overlay-bg);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
    z-index: 2000; /* Above content, below sidebar */
}

.detail-overlay.active {
    opacity: 1;
    visibility: visible;
}

@media (max-width: 768px) {
    .sidebar-right {
        position: fixed;
        top: 0;
        right: 0;
        width: 100vw;
        height: 100vh;
        z-index: 2000;
        transform: translateX(100%);
    }
    
    .sidebar-right.open {
        transform: translateX(0);
    }
}

.sidebar-right.open {
    transform: translateX(0);
}

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

.sidebar-header-actions {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.sidebar-header h2 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary-dark);
}

.close-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-sub);
    padding: var(--spacing-xs);
    border-radius: 4px;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-btn:hover {
    background: var(--background);
    color: var(--danger);
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    width: 100%; /* Full width when detail panel closed */
}

.content-header {
    padding: var(--spacing-lg);
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.content-header h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-dark);
}

.card-count {
    font-size: 0.85rem;
    color: var(--text-sub);
}

/* ========================================
   Card Grid
   ======================================== */

.card-grid {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-md);
    align-content: start;
}

.concept-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.concept-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    border-color: var(--accent);
}

.card-header-row {
    display: flex;
    justify-content: space-between;
    align-items: start;
}

.card-meta {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--primary);
    font-weight: 600;
}

.card-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1.3;
    margin: 0;
}

.card-oneliner {
    font-size: 0.9rem;
    color: var(--text-sub);
    line-height: 1.5;
    flex: 1;
}

.card-footer {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.badge {
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-novice {
    background: var(--level-novice);
    color: #ffffff;
    border: 1px solid var(--level-novice);
}

.badge-intermediate {
    background: var(--level-intermediate);
    color: #ffffff;
    border: 1px solid var(--level-intermediate);
}

.badge-advanced {
    background: var(--level-advanced);
    color: #ffffff;
    border: 1px solid var(--level-advanced);
}

.mini-tag {
    background: var(--background);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.7rem;
    color: var(--text-sub);
    border: 1px solid var(--border);
}

/* ========================================
   Learning Paths
   ======================================== */

.learning-path {
    margin-bottom: var(--spacing-lg);
}

.learning-path-title {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--primary-dark);
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--primary);
}

.learning-path-list {
    list-style: none;
}

.learning-path-item {
    padding: var(--spacing-sm);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.9rem;
    color: var(--text-main);
}

.learning-path-item:hover {
    background: var(--primary-light);
    color: var(--primary-dark);
}

/* ========================================
   Detail View
   ======================================== */

.detail-card {
    background: var(--surface);
    border-radius: 10px;
    overflow: hidden;
}

.detail-header {
    background: var(--primary-light);
    padding: var(--spacing-xl);
    border-bottom: 3px solid var(--primary);
}

.detail-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: var(--spacing-sm);
}

.detail-meta {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
}

.detail-oneliner {
    font-size: 1.05rem;
    color: var(--text-main);
    line-height: 1.6;
}

.detail-body {
    padding: var(--spacing-xl);
}

.detail-section {
    margin-bottom: var(--spacing-xl);
}

.detail-section h3 {
    font-size: 0.85rem;
    text-transform: uppercase;
    color: var(--text-sub);
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
    border-left: 3px solid var(--primary);
    padding-left: var(--spacing-sm);
}

.detail-section.collapsible h3 {
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
    margin-left: calc(-1 * var(--spacing-sm));
    border-radius: 6px;
    transition: background 0.2s;
}

.detail-section.collapsible h3:hover {
    background: var(--background);
}

.collapse-icon {
    transition: transform 0.3s;
}

.detail-section.collapsed .collapse-icon {
    transform: rotate(-90deg);
}

.detail-section.collapsed .section-content {
    display: none;
}

.detail-list {
    list-style: none;
}

.detail-list li {
    position: relative;
    padding-left: 1.25rem;
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
    color: var(--text-main);
}

.detail-list li::before {
    content: "•";
    color: var(--primary);
    font-weight: bold;
    position: absolute;
    left: 0;
}

.ai-prompts {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.ai-prompt-item {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: var(--spacing-md);
}

.ai-prompt-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.ai-prompt-text {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.5;
    color: var(--text-main);
    background: var(--surface);
    resize: vertical;
    margin-bottom: var(--spacing-sm);
}

.ai-prompt-text:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.ai-prompt-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

.ai-btn {
    padding: 0.5rem 1rem;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-main);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.ai-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.ai-btn-google:hover {
    background: #4285f4;
    color: white;
    border-color: #4285f4;
}

.ai-btn-perplexity:hover {
    background: #20808d;
    color: white;
    border-color: #20808d;
}

.linked-cards {
    margin-top: var(--spacing-lg);
}

.linked-cards h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: var(--spacing-md);
}

.linked-card-group {
    margin-bottom: var(--spacing-lg);
}

.linked-card-group h4 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-sub);
    margin-bottom: var(--spacing-sm);
}

.linked-card {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    cursor: pointer;
    transition: all 0.2s;
}

.linked-card:hover {
    background: var(--primary-light);
    border-color: var(--primary);
}

.linked-card-title {
    font-weight: 600;
    color: var(--text-main);
    font-size: 0.9rem;
}

/* ========================================
   Loading Overlay
   ======================================== */

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

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

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-overlay p {
    margin-top: var(--spacing-md);
    color: var(--text-sub);
    font-size: 0.95rem;
}

/* ========================================
   Empty States
   ======================================== */

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--spacing-xl) * 2;
    color: var(--text-sub);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.empty-state-icon {
    font-size: 4rem;
    opacity: 0.3;
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-main);
}

.empty-state p {
    max-width: 400px;
    margin-bottom: var(--spacing-md);
}

.empty-state button {
    margin: var(--spacing-xs);
}

.btn-primary {
    padding: 0.6rem 1.5rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    padding: 0.6rem 1.5rem;
    background: var(--background);
    color: var(--text-main);
    border: 1px solid var(--border);
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-secondary:hover {
    background: var(--surface);
    border-color: var(--primary);
    transform: translateY(-1px);
}

/* ========================================
   New Features Styles
   ======================================== */

/* Card Indicators */
.card-indicators {
    display: flex;
    gap: var(--spacing-xs);
}

.card-indicator {
    font-size: 1rem;
    opacity: 0.8;
}

.bookmark-indicator {
    color: #f59e0b;
}

.studied-indicator {
    color: var(--success);
    font-weight: bold;
}

/* Detail Header Actions */
.detail-header-top {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: var(--spacing-md);
}

.detail-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.action-btn {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.25rem;
    transition: all 0.2s;
}

.action-btn:hover {
    background: var(--primary-light);
    border-color: var(--primary);
    transform: scale(1.1);
}

.action-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* Progress Section */
.progress-section {
    padding: var(--spacing-lg);
    background: var(--primary-light);
    border-radius: 8px;
    margin-bottom: var(--spacing-lg);
}

.progress-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.progress-label {
    font-weight: 700;
    color: var(--primary-dark);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

.progress-count {
    font-weight: 600;
    color: var(--primary);
}

.progress-bar {
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transition: width 0.5s ease;
    border-radius: 4px;
}

/* Smooth Animations */
.concept-card {
    animation: fadeIn 0.3s ease;
}

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

.sidebar-right {
    animation: slideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
    }
    to {
        transform: translateX(0);
    }
}

/* ========================================
   Modal Styles
   ======================================== */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 3000;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--surface);
    border-radius: 12px;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border);
}

.modal-header h2 {
    margin: 0;
    font-size: 1.5rem;
    color: var(--primary-dark);
}

.modal-body {
    padding: var(--spacing-lg);
}

.shortcuts-grid {
    display: grid;
    gap: var(--spacing-md);
}

.shortcut-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--background);
    border-radius: 6px;
}

.shortcut-item kbd {
    display: inline-block;
    padding: 0.4rem 0.8rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-dark);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    min-width: 40px;
    text-align: center;
}

.shortcut-item span {
    flex: 1;
    color: var(--text-main);
}

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 1200px) {
    .sidebar-left {
        display: none;
    }
}

@media (max-width: 768px) {
    .app-header {
        height: auto;
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .header-content {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }
    
    .logo-section {
        min-width: auto;
        flex: 1;
    }
    
    .logo {
        font-size: 1.25rem;
    }
    
    .tagline {
        font-size: 0.7rem;
    }
    
    .nav-controls {
        order: 2;
    }
    
    .pack-selector-container {
        order: 3;
        min-width: 120px;
        flex: 1;
    }
    
    .header-actions {
        order: 4;
    }
    
    .toggle-label {
        display: none;
    }
    
    .search-container {
        order: 5;
        flex-basis: 100%;
        max-width: none;
        margin-top: var(--spacing-sm);
    }
    
    /* Hide expand button on mobile (detail panel is already full-width) */
    #expandDetailBtn {
        display: none !important;
    }
    
    .sidebar-header {
        padding: var(--spacing-md);
    }
    
    .sidebar-content {
        padding: var(--spacing-md);
    }
    
    .detail-header {
        padding: var(--spacing-lg);
    }
    
    .detail-body {
        padding: var(--spacing-lg);
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
}