/* ============================================
   CSS Variables & Design Tokens
   ============================================ */
:root {
    /* Color Palette - Windows-inspired */
    --color-primary: #0078d4;
    --color-primary-dark: #106ebe;
    --color-primary-light: #40e0ff;
    --color-secondary: #5c2d91;
    --color-accent: #0078d4;
    --color-success: #107c10;
    --color-warning: #ffb900;
    --color-danger: #d13438;
    
    /* Background Colors - Windows style */
    --bg-primary: #f0f0f0;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e1e1e1;
    --bg-card: #ffffff;
    --bg-hover: #e5f1fb;
    --bg-selected: #cce8ff;
    
    /* Text Colors */
    --text-primary: #323130;
    --text-secondary: #605e5c;
    --text-muted: #8a8886;
    --text-inverse: #ffffff;
    
    /* Border & Dividers */
    --border-color: #d1d1d1;
    --border-radius: 2px;
    --border-radius-sm: 1px;
    --border-radius-lg: 3px;
    
    /* Spacing - More compact */
    --spacing-xs: 2px;
    --spacing-sm: 4px;
    --spacing-md: 8px;
    --spacing-lg: 12px;
    --spacing-xl: 16px;
    --spacing-2xl: 20px;
    
    /* Shadows - Subtle Windows style */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 8px 16px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 0.1s ease;
    --transition-base: 0.2s ease;
    
    /* Typography - Compact */
    --font-family: 'Segoe UI', Tahoma, Arial, sans-serif;
    --font-size-xs: 10px;
    --font-size-sm: 11px;
    --font-size-base: 12px;
    --font-size-lg: 13px;
    --font-size-xl: 14px;
    --font-size-2xl: 16px;
    --font-size-3xl: 18px;
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-modal: 2000;
    --z-tooltip: 3000;
}

/* ============================================
   Global Styles & Reset
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.4;
    font-size: var(--font-size-base);
    overflow-x: hidden;
}

/* Windows-style scrollbar */
::-webkit-scrollbar {
    width: 16px;
    height: 16px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border: 1px solid #a6a6a6;
    border-radius: 0;
}

::-webkit-scrollbar-thumb:hover {
    background: #a6a6a6;
}

::-webkit-scrollbar-corner {
    background: var(--bg-tertiary);
}

/* ============================================
   Layout
   ============================================ */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.app-header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo-icon {
    width: 20px;
    height: 20px;
    color: var(--color-primary);
}

.logo h1 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
}

.status-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
}

.status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-success);
}

.status-text {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 400;
}

.app-main {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-md);
    height: calc(100vh - 60px);
    overflow: hidden;
}

.left-panel,
.right-panel {
    min-height: 0;
    overflow: hidden;
}

.right-panel-scroll {
    height: 100%;
    overflow-y: auto;
    overflow-x: hidden;
}

/* ============================================
   Cards
   ============================================ */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
}

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

.card-header {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: var(--bg-tertiary);
    min-height: 32px;
}

.card-header h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    flex: 1;
    margin: 0;
}

.step-badge {
    background: var(--color-primary);
    color: var(--text-inverse);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-xs);
    font-weight: 600;
    min-width: 50px;
    text-align: center;
}

.optional-badge {
    background: var(--bg-hover);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

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

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

.section-description {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

/* ============================================
   Upload Area (Made Smaller and Compact)
   ============================================ */
.upload-area {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    text-align: center;
    transition: var(--transition-base);
    cursor: pointer;
    background: var(--bg-secondary);
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.upload-area:hover {
    border-color: var(--color-primary);
    background: var(--bg-hover);
}

.upload-area.drag-over {
    border-color: var(--color-primary);
    background: var(--bg-hover);
}

.upload-icon {
    width: 16px;
    height: 16px;
    color: var(--color-primary);
    margin: 0;
    flex-shrink: 0;
}

.upload-text {
    color: var(--text-primary);
    margin: 0;
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* ============================================
   Buttons (Windows Desktop Style)
   ============================================ */
.btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-base);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    font-family: var(--font-family);
    min-height: 28px;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

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

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

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-hover);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

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

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
    min-height: 22px;
}

.btn-large {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    width: 100%;
    min-height: 32px;
}

.button-group {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

/* ============================================
   Forms (Windows Desktop Style)
   ============================================ */
.form-input,
.form-select {
    width: 100%;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 2px;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    font-family: var(--font-family);
    transition: var(--transition-base);
    height: 22px;
    line-height: 1.2;
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.1);
}

.form-input::placeholder {
    color: var(--text-muted);
}

.form-input-sm {
    width: auto;
    min-width: 60px;
}

.form-group {
    margin-bottom: var(--spacing-sm);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

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

.checkbox-label,
.radio-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    user-select: none;
}

.checkbox-label:hover,
.radio-label:hover {
    color: var(--text-primary);
}

input[type="checkbox"],
input[type="radio"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--color-primary);
}

/* ============================================
   Tables (Compact Windows Style)
   ============================================ */
.table-container {
    overflow-x: auto;
    margin: var(--spacing-sm) 0;
    border-radius: 2px;
    border: 1px solid var(--border-color);
    max-height: 300px;
    overflow-y: auto;
    background: white;
}

.course-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-xs);
}

.course-table thead {
    position: sticky;
    top: 0;
    z-index: 10;
}

.course-table th {
    background: var(--bg-tertiary);
    padding: var(--spacing-xs) var(--spacing-sm);
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
    font-size: var(--font-size-xs);
    height: 24px;
}

.course-table td {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-bottom: 1px solid #e0e0e0;
    color: var(--text-primary);
    height: 20px;
    line-height: 1.2;
}

.course-table tbody tr {
    transition: var(--transition-fast);
    cursor: pointer;
}

.course-table tbody tr:hover {
    background: #f0f0f0;
}

.course-table tbody tr.selected {
    background: #e6f3ff;
}

.no-data-row td {
    text-align: center;
    padding: var(--spacing-md);
    color: var(--text-muted);
    font-style: italic;
}

.results-table {
    font-size: var(--font-size-sm);
}

.results-table tbody tr {
    cursor: default;
}

/* ============================================
   Lists (Compact Style)
   ============================================ */
.list-container {
    max-height: 150px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 2px;
    margin: var(--spacing-sm) 0;
    background: white;
}

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

.course-list li {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-bottom: 1px solid #e0e0e0;
    transition: var(--transition-fast);
    cursor: pointer;
    color: var(--text-primary);
    font-size: var(--font-size-xs);
    line-height: 1.2;
    min-height: 18px;
    display: flex;
    align-items: center;
}

.course-list li:last-child {
    border-bottom: none;
}

.course-list li:hover:not(.empty-state) {
    background: #f0f0f0;
}

.course-list li.selected {
    background: #e6f3ff;
}

.empty-state {
    color: var(--text-muted);
    font-style: italic;
    text-align: center;
    padding: var(--spacing-md) !important;
    cursor: default !important;
    min-height: 40px;
}

.empty-state:hover {
    background: transparent !important;
}

/* ============================================
   Status Info (Compact Style)
   ============================================ */
.data-status {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--bg-secondary);
    border-radius: 2px;
    margin: var(--spacing-sm) 0;
    border: 1px solid var(--border-color);
}

.status-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.status-label {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-value {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-primary);
}

.status-info {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-secondary);
    border-radius: 2px;
    color: var(--text-primary);
    font-size: var(--font-size-xs);
    border: 1px solid var(--border-color);
}

/* ============================================
   Time Preferences Grid (Compact Style)
   ============================================ */
.time-prefs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-sm);
    margin: var(--spacing-sm) 0;
}

.time-pref-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 2px;
    padding: var(--spacing-sm);
    transition: var(--transition-base);
}

.time-pref-card:hover {
    border-color: var(--color-primary);
}

.day-header {
    margin-bottom: var(--spacing-sm);
}

.day-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
}

.time-controls {
    opacity: 0.5;
    transition: var(--transition-base);
    pointer-events: none;
}

.time-pref-card:has(.day-enabled:checked) .time-controls {
    opacity: 1;
pointer-events: auto;
}

.time-row {
    display: grid;
    grid-template-columns: auto 1fr auto 1fr;
    gap: var(--spacing-xs);
    align-items: center;
    margin-bottom: var(--spacing-xs);
}

.time-row label {
    color: var(--text-primary);
    font-size: var(--font-size-xs);
}

.time-input {
    padding: 2px var(--spacing-xs);
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 2px;
    color: var(--text-primary);
    font-size: var(--font-size-xs);
    height: 20px;
}

.pref-type {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

/* ============================================
   Groups (Compact Style)
   ============================================ */
.groups-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
    margin: var(--spacing-sm) 0;
}

.groups-list {
    border: 1px solid var(--border-color);
    border-radius: 2px;
    padding: var(--spacing-xs);
    max-height: 200px;
    overflow-y: auto;
    background: white;
}

.group-item {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-secondary);
    border-radius: 2px;
    margin-bottom: var(--spacing-xs);
    cursor: pointer;
    transition: var(--transition-fast);
    border: 1px solid transparent;
}

.group-item:hover {
    background: #f0f0f0;
}

.group-item.active {
    border-color: var(--color-primary);
    background: #e6f3ff;
}

.group-item h4 {
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    margin-bottom: 2px;
    font-weight: 600;
}

.group-item p {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    margin: 0;
    line-height: 1.2;
}

.group-courses-panel h4 {
    font-size: var(--font-size-xs);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

/* ============================================
   Preferences Display (Compact Style)
   ============================================ */
.preferences-display {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--bg-secondary);
    border-radius: 2px;
    border: 1px solid var(--border-color);
}

.preferences-display h4 {
    font-size: var(--font-size-xs);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

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

.preferences-list li {
    padding: var(--spacing-xs);
    margin-bottom: 2px;
    background: white;
    border-radius: 2px;
    color: var(--text-primary);
    font-size: var(--font-size-xs);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid #e0e0e0;
}

.preferences-list li strong {
    color: var(--color-primary);
}

/* ============================================
   Subsections (Compact Style)  
   ============================================ */
.subsection {
    margin: var(--spacing-md) 0;
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border-color);
}

.subsection:first-child {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.subsection h3 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.credit-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}

/* ============================================
   Checklist (Compact Style)
   ============================================ */
.checklist {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 2px;
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.checklist h4 {
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
    font-weight: 600;
}

.checklist ul {
    list-style: none;
}

.checklist li {
    padding: 2px 0;
    color: var(--text-primary);
    font-size: var(--font-size-xs);
    line-height: 1.3;
}

.checklist li.complete {
    color: var(--color-success);
}

.checklist li.incomplete {
    color: var(--color-danger);
}

/* ============================================
   Progress Bar
   ============================================ */
.progress-container {
    margin-top: var(--spacing-md);
}

.progress-bar {
    height: 8px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    width: 0%;
    transition: width 0.3s ease;
    border-radius: var(--border-radius);
}

.progress-text {
    text-align: center;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* ============================================
   Results Summary
   ============================================ */
.results-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.summary-card {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    text-align: center;
    border: 1px solid var(--border-color);
}

.summary-card h4 {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-xs);
}

.summary-card p {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-primary);
}

/* ============================================
   Modal
   ============================================ */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(5px);
    z-index: var(--z-modal);
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-xl);
    max-width: 90vw;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.modal-large {
    width: 1200px;
}

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

.modal-header h2 {
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--font-size-3xl);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
    line-height: 1;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    color: var(--text-primary);
}

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

/* ============================================
   Schedule Grid
   ============================================ */
.schedule-grid {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    min-height: 600px;
}

/* ============================================
   Context Menu
   ============================================ */
.context-menu {
    position: fixed;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    z-index: var(--z-dropdown);
    min-width: 200px;
    display: none;
}

.context-menu.active {
    display: block;
}

.context-menu ul {
    list-style: none;
    padding: var(--spacing-xs);
}

.context-menu li {
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    transition: var(--transition-fast);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.context-menu li:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

/* ============================================
   Help Text (Compact Style)
   ============================================ */
.help-text {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: #f0f8ff;
    border-left: 2px solid var(--color-primary);
    border-radius: 2px;
    color: var(--text-primary);
    font-size: var(--font-size-xs);
    line-height: 1.3;
}

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

@keyframes slideIn {
    from {
        transform: translateX(-100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.fade-in {
    animation: fadeIn var(--transition-base);
}

.slide-in {
    animation: slideIn var(--transition-base);
}

/* ============================================
   Responsive Design (Compact Adjustments)
   ============================================ */
@media (max-width: 1200px) {
    .app-main {
        grid-template-columns: 1fr;
    }
    
    .right-panel-scroll {
        height: auto;
    }
    
    .groups-container {
        grid-template-columns: 1fr;
    }
    
    .time-prefs-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .app-header {
        padding: var(--spacing-sm);
    }
    
    .header-content {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .app-main {
        padding: var(--spacing-sm);
        gap: var(--spacing-sm);
    }
    
    .logo h1 {
        font-size: var(--font-size-lg);
    }
    
    .card-header {
        flex-wrap: wrap;
    }
    
    .credit-controls {
        grid-template-columns: 1fr;
    }
    
    .results-summary {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Filter Section (Compact Style)
   ============================================ */
.filter-section {
    margin: var(--spacing-sm) 0;
}

/* ============================================
   Run Section (Compact Style)
   ============================================ */
.run-section {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border-color);
}

/* ============================================
   Toast Notifications
   ============================================ */
.toast-container {
    position: fixed;
    bottom: 20px;
    left: 20px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    pointer-events: none;
}

.toast {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-sm) var(--spacing-md);
    min-width: 280px;
    max-width: 400px;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    opacity: 0;
    transform: translateX(-100%);
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    pointer-events: auto;
    border-left: 4px solid var(--border-color);
}

.toast.show {
    opacity: 1;
    transform: translateX(0);
}

.toast.success {
    border-left-color: var(--color-success);
}

.toast.info {
    border-left-color: var(--color-primary);
}

.toast.error {
    border-left-color: var(--color-error);
}

.toast-icon {
    font-size: var(--font-size-lg);
    flex-shrink: 0;
}

.toast-content {
    flex: 1;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    line-height: 1.4;
}

.toast-close {
    background: none;
    border: none;
    font-size: var(--font-size-lg);
    color: var(--text-muted);
    cursor: pointer;
    padding: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 2px;
    transition: var(--transition-fast);
    flex-shrink: 0;
}

.toast-close:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideOutLeft {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(-100%);
    }
}

/* ============================================
   Visualization Controls
   ============================================ */
.visualization-controls {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-sm);
    margin: var(--spacing-sm) 0;
}

.speed-control {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.speed-control input[type="range"] {
    width: 100%;
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.speed-control input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--color-primary);
    border-radius: 50%;
    cursor: pointer;
}

.speed-control input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--color-primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

/* ============================================
   File Options
   ============================================ */
.file-options {
    margin: var(--spacing-md) 0;
}

.option-divider {
    text-align: center;
    margin: var(--spacing-md) 0;
    position: relative;
    color: var(--text-muted);
    font-size: var(--font-size-xs);
    font-weight: 600;
}

.option-divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--border-color);
    z-index: 1;
}

.option-divider span {
    background: var(--bg-secondary);
    padding: 0 var(--spacing-sm);
    position: relative;
    z-index: 2;
}

.file-selection {
    display: flex;
    gap: var(--spacing-sm);
    align-items: end;
}

.file-selection .form-select {
    flex: 1;
}

.file-selection .btn {
    flex-shrink: 0;
}