/* ==========================================================================
   AI Timetable Generator - Stylesheet
   Modern, sleek design for the AI-powered timetable generation wizard
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables
   -------------------------------------------------------------------------- */
:root {
    --ai-primary: var(--sf-primary-color, #0d6efd);
    --ai-primary-dark: #0b5ed7;
    --ai-primary-light: rgba(13, 110, 253, 0.1);
    --ai-secondary: #0a58ca;
    --ai-success: #27ae60;
    --ai-success-dark: #229954;
    --ai-success-light: #e8f5e9;
    --ai-danger: #e74c3c;
    --ai-danger-light: #ffebee;
    --ai-warning: #f39c12;
    --ai-warning-light: #fff3e0;
    --ai-info: #3498db;
    --ai-info-light: #e3f2fd;
    --ai-gray-50: #f9fafb;
    --ai-gray-100: #f3f4f6;
    --ai-gray-200: #e5e7eb;
    --ai-gray-300: #d1d5db;
    --ai-gray-500: #6b7280;
    --ai-gray-700: #374151;
    --ai-gray-900: #111827;
    --ai-radius: 8px;
    --ai-radius-sm: 4px;
    --ai-radius-lg: 12px;
    --ai-shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --ai-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --ai-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --ai-transition: all 0.2s ease;
}

/* --------------------------------------------------------------------------
   Wizard Container
   -------------------------------------------------------------------------- */
.ai-wizard-container {
    max-width: 960px;
    margin: 20px auto;
    background: #fff;
    border-radius: var(--ai-radius-lg);
    box-shadow: var(--ai-shadow-lg);
    overflow: hidden;
}

.ai-wizard-header {
    background: var(--ai-primary);
    color: white;
    padding: 32px 24px;
    text-align: center;
}

.ai-wizard-header h1 {
    margin: 0;
    font-size: 26px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    letter-spacing: -0.3px;
}

.ai-wizard-header p {
    margin: 8px 0 0 0;
    font-size: 14px;
    opacity: 0.9;
    font-weight: 400;
}

/* --------------------------------------------------------------------------
   Progress Steps
   -------------------------------------------------------------------------- */
.ai-wizard-progress {
    background: white;
    border-bottom: 1px solid var(--ai-gray-200);
    padding: 20px 24px;
}

.progress-steps {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    max-width: 100%;
    position: relative;
}

.progress-step {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    color: var(--ai-gray-500);
    transition: var(--ai-transition);
    position: relative;
}

.progress-step::after {
    content: '';
    position: absolute;
    top: 50%;
    right: -4px;
    width: 8px;
    height: 1px;
    background: var(--ai-gray-300);
}

.progress-step:last-child::after {
    display: none;
}

.progress-step.active {
    color: var(--ai-primary);
    font-weight: 600;
}

.progress-step.completed {
    color: var(--ai-success);
}

.progress-step-number {
    width: 34px;
    height: 34px;
    min-width: 34px;
    border-radius: 50%;
    background: var(--ai-gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
    transition: var(--ai-transition);
    border: 2px solid transparent;
}

.progress-step.active .progress-step-number {
    background: var(--ai-primary);
    color: white;
    border-color: var(--ai-primary);
    box-shadow: 0 0 0 4px var(--ai-primary-light);
}

.progress-step.completed .progress-step-number {
    background: var(--ai-success);
    color: white;
    border-color: var(--ai-success);
}

.progress-step-label {
    flex: 1;
    white-space: nowrap;
}

/* --------------------------------------------------------------------------
   Wizard Body & Footer
   -------------------------------------------------------------------------- */
.ai-wizard-body {
    padding: 36px 40px;
    min-height: 400px;
}

.ai-wizard-footer {
    border-top: 1px solid var(--ai-gray-200);
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    gap: 12px;
    background: var(--ai-gray-50);
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn-ai {
    padding: 10px 22px;
    border: none;
    border-radius: var(--ai-radius);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--ai-transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    line-height: 1.4;
}

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

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

.btn-ai-back {
    background: var(--ai-gray-100);
    color: var(--ai-gray-700);
}

.btn-ai-back:hover {
    background: var(--ai-gray-200);
    color: var(--ai-gray-700);
    text-decoration: none;
}

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

.btn-ai-next:hover {
    background: var(--ai-primary-dark);
    color: white;
    text-decoration: none;
}

.btn-ai-generate {
    background: var(--ai-success);
    color: white;
    padding: 12px 28px;
    font-size: 15px;
}

.btn-ai-generate:hover {
    background: var(--ai-success-dark);
    color: white;
    text-decoration: none;
}

.btn-ai-danger {
    background: var(--ai-danger-light);
    color: var(--ai-danger);
}

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

.btn-ai-sm {
    padding: 6px 14px;
    font-size: 12px;
}

.btn-ai:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* --------------------------------------------------------------------------
   Form Section & Inputs
   -------------------------------------------------------------------------- */
.ai-form-section {
    margin-bottom: 32px;
}

.ai-form-section h3 {
    font-size: 16px;
    font-weight: 700;
    margin: 0 0 16px 0;
    color: var(--ai-gray-900);
    border-bottom: 2px solid var(--ai-primary);
    padding-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.ai-form-section h3 i {
    color: var(--ai-primary);
}

.ai-form-group {
    margin-bottom: 20px;
}

.ai-form-group > label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--ai-gray-700);
    font-size: 14px;
}

.ai-input,
.ai-select {
    width: 100%;
    padding: 10px 14px;
    border: 1.5px solid var(--ai-gray-300);
    border-radius: var(--ai-radius);
    font-size: 14px;
    font-family: inherit;
    transition: var(--ai-transition);
    background: white;
    color: var(--ai-gray-900);
    box-sizing: border-box;
}

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

.ai-input::placeholder {
    color: var(--ai-gray-500);
}

.ai-input-sm {
    max-width: 120px;
}

.ai-hint {
    display: block;
    margin-top: 6px;
    font-size: 12px;
    color: var(--ai-gray-500);
}

/* --------------------------------------------------------------------------
   Radio & Checkbox Groups
   -------------------------------------------------------------------------- */
.ai-radio-group,
.ai-checkbox-group {
    display: grid;
    gap: 10px;
}

.ai-radio-group.cols-2 { grid-template-columns: 1fr 1fr; }
.ai-radio-group.cols-3 { grid-template-columns: 1fr 1fr 1fr; }
.ai-radio-group.cols-4 { grid-template-columns: repeat(4, 1fr); }

.ai-checkbox-group.cols-auto {
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
}

.ai-radio-label,
.ai-checkbox-label {
    display: flex;
    align-items: center;
    font-weight: 400 !important;
    gap: 8px;
    padding: 10px 14px;
    border: 1.5px solid var(--ai-gray-200);
    border-radius: var(--ai-radius);
    cursor: pointer;
    transition: var(--ai-transition);
    font-size: 14px;
}

.ai-radio-label:hover,
.ai-checkbox-label:hover {
    border-color: var(--ai-primary);
    background: var(--ai-primary-light);
}

.ai-radio-label input:checked + span,
.ai-checkbox-label input:checked + span {
    font-weight: 600;
    color: var(--ai-primary);
}

.ai-radio-label:has(input:checked),
.ai-checkbox-label:has(input:checked) {
    border-color: var(--ai-primary);
    background: var(--ai-primary-light);
}

/* --------------------------------------------------------------------------
   School Hours Grid
   -------------------------------------------------------------------------- */
.ai-hours-row {
    display: grid;
    grid-template-columns: 140px 1fr 1fr;
    gap: 16px;
    margin-bottom: 12px;
    align-items: center;
    padding: 10px 14px;
    background: var(--ai-gray-50);
    border-radius: var(--ai-radius);
    border: 1px solid var(--ai-gray-200);
}

.ai-hours-row label {
    font-weight: 600;
    color: var(--ai-gray-700);
    font-size: 14px;
    margin: 0;
}

.ai-hours-row .ai-time-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.ai-hours-row .ai-time-group small {
    font-size: 11px;
    color: var(--ai-gray-500);
    font-weight: 500;
}

.ai-hours-row input[type="time"] {
    padding: 8px 12px;
    border: 1.5px solid var(--ai-gray-300);
    border-radius: var(--ai-radius);
    font-size: 14px;
    transition: var(--ai-transition);
    background: white;
}

.ai-hours-row input[type="time"]:focus {
    outline: none;
    border-color: var(--ai-primary);
    box-shadow: 0 0 0 3px var(--ai-primary-light);
}

/* --------------------------------------------------------------------------
   Alert Boxes
   -------------------------------------------------------------------------- */
.ai-alert {
    padding: 14px 18px;
    border-radius: var(--ai-radius);
    margin-bottom: 20px;
    font-size: 14px;
    display: flex;
    gap: 10px;
    align-items: flex-start;
    line-height: 1.5;
}

.ai-alert i {
    margin-top: 2px;
}

.ai-alert-info {
    background: var(--ai-info-light);
    border: 1px solid #90caf9;
    color: #0d47a1;
}

.ai-alert-warning {
    background: var(--ai-warning-light);
    border: 1px solid #ffe0b2;
    color: #e65100;
}

.ai-alert-danger {
    background: var(--ai-danger-light);
    border: 1px solid #ef9a9a;
    color: #b71c1c;
}

.ai-alert-success {
    background: var(--ai-success-light);
    border: 1px solid #a5d6a7;
    color: #1b5e20;
}

/* --------------------------------------------------------------------------
   Blocked Slots Table
   -------------------------------------------------------------------------- */
.ai-table {
    width: 100%;
    border-collapse: collapse;
}

.ai-table thead th {
    padding: 12px 14px;
    text-align: left;
    border-bottom: 2px solid var(--ai-gray-200);
    font-weight: 600;
    font-size: 13px;
    color: var(--ai-gray-700);
    background: var(--ai-gray-50);
}

.ai-table tbody td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--ai-gray-200);
    font-size: 14px;
    vertical-align: middle;
}

.ai-table tbody tr:hover {
    background: var(--ai-gray-50);
}

.ai-table tbody tr.clash-row {
    background: var(--ai-danger-light) !important;
}

.ai-table tbody tr.clash-row td {
    border-bottom-color: #ef9a9a;
}

.ai-table .text-center {
    text-align: center;
}

/* --------------------------------------------------------------------------
   Quick-Add Chips
   -------------------------------------------------------------------------- */
.ai-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.ai-chip {
    padding: 6px 14px;
    background: var(--ai-gray-100);
    border: 1.5px solid var(--ai-gray-300);
    border-radius: 20px;
    font-size: 13px;
    cursor: pointer;
    transition: var(--ai-transition);
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 500;
}

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

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

/* --------------------------------------------------------------------------
   Progress / Generation
   -------------------------------------------------------------------------- */
.ai-progress-bar-track {
    background: var(--ai-gray-200);
    height: 8px;
    border-radius: 4px;
    overflow: hidden;
    margin: 16px 0;
}

.ai-progress-bar-fill {
    height: 100%;
    background: var(--ai-primary);
    border-radius: 4px;
    transition: width 0.5s ease;
    width: 0%;
}

.ai-progress-bar-fill.success {
    background: var(--ai-success);
}

.ai-generation-log {
    background: var(--ai-gray-900);
    color: #a5d6a7;
    padding: 16px 20px;
    border-radius: var(--ai-radius);
    font-family: 'Courier New', Courier, monospace;
    font-size: 12px;
    max-height: 300px;
    overflow-y: auto;
    line-height: 1.6;
}

.ai-generation-log .log-entry {
    margin-bottom: 4px;
}

.ai-generation-log .log-time {
    color: var(--ai-gray-500);
}

.ai-generation-log .log-error {
    color: #ef9a9a;
}

.ai-generation-log .log-success {
    color: #a5d6a7;
}

.ai-generation-steps {
    list-style: none;
    padding: 0;
    margin: 20px 0;
}

.ai-generation-steps li {
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: var(--ai-gray-500);
    border-left: 3px solid var(--ai-gray-200);
    margin-bottom: 4px;
    transition: var(--ai-transition);
}

.ai-generation-steps li.active {
    color: var(--ai-primary);
    font-weight: 600;
    border-left-color: var(--ai-primary);
    background: var(--ai-primary-light);
}

.ai-generation-steps li.completed {
    color: var(--ai-success);
    border-left-color: var(--ai-success);
}

.ai-generation-steps li.error {
    color: var(--ai-danger);
    border-left-color: var(--ai-danger);
    background: var(--ai-danger-light);
}

/* --------------------------------------------------------------------------
   Timetable Preview Grid
   -------------------------------------------------------------------------- */
.ai-timetable-grid {
    width: 100%;
    border-collapse: collapse;
    table-layout: fixed;
    font-size: 12px;
}

.ai-timetable-grid th {
    padding: 10px 8px;
    background: var(--ai-primary);
    color: white;
    font-weight: 600;
    font-size: 13px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.2);
    position: sticky;
    top: 0;
    z-index: 10;
}

.ai-timetable-grid th.time-col {
    width: 90px;
    background: var(--ai-gray-700);
}

.ai-timetable-grid td {
    padding: 6px 8px;
    border: 1px solid var(--ai-gray-200);
    vertical-align: top;
    min-height: 60px;
    height: 60px;
    position: relative;
}

.ai-timetable-grid td.time-cell {
    background: var(--ai-gray-50);
    text-align: center;
    font-weight: 600;
    font-size: 11px;
    color: var(--ai-gray-700);
    vertical-align: middle;
}

.ai-timetable-entry {
    padding: 6px 8px;
    border-radius: var(--ai-radius-sm);
    font-size: 11px;
    line-height: 1.3;
    min-height: 44px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    cursor: pointer;
    transition: var(--ai-transition);
    border-left: 3px solid transparent;
}

.ai-timetable-entry:hover {
    box-shadow: var(--ai-shadow);
    transform: scale(1.02);
}

.ai-timetable-entry.teaching {
    background: #e3f2fd;
    border-left-color: var(--ai-info);
}

.ai-timetable-entry.blocked {
    background: var(--ai-gray-100);
    border-left-color: var(--ai-gray-500);
    cursor: default;
    opacity: 0.8;
}

.ai-timetable-entry.clash {
    background: var(--ai-danger-light);
    border-left-color: var(--ai-danger);
    animation: pulse-red 2s infinite;
}

.ai-timetable-entry.accepted {
    background: var(--ai-success-light);
    border-left-color: var(--ai-success);
}

.ai-timetable-entry.rejected {
    background: var(--ai-gray-100);
    border-left-color: var(--ai-gray-300);
    opacity: 0.5;
    text-decoration: line-through;
}

@keyframes pulse-red {
    0%, 100% { box-shadow: 0 0 0 0 rgba(231, 76, 60, 0.3); }
    50% { box-shadow: 0 0 0 4px rgba(231, 76, 60, 0); }
}

.ai-entry-subject {
    font-weight: 700;
    color: var(--ai-gray-900);
    font-size: 12px;
}

.ai-entry-teacher {
    color: var(--ai-gray-500);
    font-size: 10px;
}

.ai-entry-actions {
    position: absolute;
    top: 4px;
    right: 4px;
    display: flex;
    gap: 2px;
    opacity: 0;
    transition: var(--ai-transition);
}

.ai-timetable-entry:hover .ai-entry-actions {
    opacity: 1;
}

.ai-entry-action-btn {
    width: 20px;
    height: 20px;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    transition: var(--ai-transition);
}

.ai-entry-action-btn.accept {
    background: var(--ai-success);
    color: white;
}

.ai-entry-action-btn.reject {
    background: var(--ai-danger);
    color: white;
}

/* --------------------------------------------------------------------------
   Section Tab Navigator
   -------------------------------------------------------------------------- */
.ai-section-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 20px;
    padding: 12px;
    background: var(--ai-gray-50);
    border-radius: var(--ai-radius);
    border: 1px solid var(--ai-gray-200);
}

.ai-section-tab {
    padding: 8px 16px;
    background: white;
    border: 1.5px solid var(--ai-gray-300);
    border-radius: var(--ai-radius);
    font-size: 13px;
    cursor: pointer;
    transition: var(--ai-transition);
    font-weight: 500;
}

.ai-section-tab:hover {
    border-color: var(--ai-primary);
    color: var(--ai-primary);
}

.ai-section-tab.active {
    background: var(--ai-primary);
    color: white;
    border-color: var(--ai-primary);
}

/* --------------------------------------------------------------------------
   Summary Stats Card
   -------------------------------------------------------------------------- */
.ai-stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.ai-stat-card {
    padding: 16px 20px;
    border-radius: var(--ai-radius);
    border: 1px solid var(--ai-gray-200);
    background: white;
    text-align: center;
}

.ai-stat-card .stat-value {
    font-size: 28px;
    font-weight: 800;
    color: var(--ai-gray-900);
    line-height: 1;
}

.ai-stat-card .stat-label {
    font-size: 12px;
    color: var(--ai-gray-500);
    font-weight: 500;
    margin-top: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.ai-stat-card.success .stat-value { color: var(--ai-success); }
.ai-stat-card.danger .stat-value { color: var(--ai-danger); }
.ai-stat-card.info .stat-value { color: var(--ai-info); }

/* --------------------------------------------------------------------------
   Preset Card
   -------------------------------------------------------------------------- */
.ai-preset-card {
    padding: 16px 20px;
    border: 1.5px solid var(--ai-gray-200);
    border-radius: var(--ai-radius);
    background: white;
    transition: var(--ai-transition);
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.ai-preset-card:hover {
    border-color: var(--ai-primary);
    box-shadow: var(--ai-shadow);
}

.ai-preset-card .preset-name {
    font-weight: 600;
    font-size: 15px;
    color: var(--ai-gray-900);
}

.ai-preset-card .preset-meta {
    font-size: 12px;
    color: var(--ai-gray-500);
    margin-top: 4px;
}

/* --------------------------------------------------------------------------
   Loading Spinner
   -------------------------------------------------------------------------- */
.ai-spinner {
    border: 3px solid var(--ai-gray-200);
    border-top: 3px solid var(--ai-primary);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    animation: ai-spin 0.8s linear infinite;
    margin: 0 auto;
}

@keyframes ai-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.ai-loading {
    text-align: center;
    padding: 40px 20px;
    color: var(--ai-gray-500);
}

.ai-loading p {
    margin-top: 14px;
    font-size: 14px;
}

/* --------------------------------------------------------------------------
   AI Badge
   -------------------------------------------------------------------------- */
.ai-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.ai-badge-primary {
    background: var(--ai-primary);
    color: white;
}

.ai-badge-success {
    background: var(--ai-success);
    color: white;
}

.ai-badge-danger {
    background: var(--ai-danger);
    color: white;
}

.ai-badge-warning {
    background: var(--ai-warning);
    color: white;
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
    .ai-wizard-body {
        padding: 20px 16px;
    }

    .ai-wizard-footer {
        padding: 16px;
        flex-direction: column;
    }

    .progress-steps {
        flex-direction: column;
        gap: 8px;
    }

    .progress-step::after {
        display: none;
    }

    .ai-radio-group.cols-2,
    .ai-radio-group.cols-3,
    .ai-radio-group.cols-4 {
        grid-template-columns: 1fr;
    }

    .ai-hours-row {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .ai-stats-row {
        grid-template-columns: 1fr 1fr;
    }
}