/* Schedulae - Main Stylesheet */

/* ==========================================================================
   1. CSS Variables
   ========================================================================== */

:root {
    /* Colors - Text */
    --color-heading: #2c3e50;
    --color-text: #333;
    --color-text-muted: #666;
    --color-text-light: #888;
    --color-placeholder: #999;

    /* Colors - Primary */
    --color-primary: #3498db;
    --color-primary-hover: #2980b9;
    --color-primary-active: #2471a3;

    /* Colors - Status */
    --color-success: #27ae60;
    --color-error: #e74c3c;
    --color-warning: #FF9800;

    /* Colors - Borders */
    --color-border: #ddd;
    --color-border-light: #ccc;
    --color-border-medium: #e0e0e0;

    /* Colors - Backgrounds */
    --color-bg: #f5f5f5;
    --color-bg-subtle: #f9f9f9;
    --color-bg-alt: #fafafa;
    --color-bg-card: #fff;
    --color-bg-corner: #eaeaea;

    /* Spacing */
    --spacing-2xs: 4px;
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 15px;
    --spacing-lg: 20px;
    --spacing-xl: 25px;

    /* Border Radius */
    --radius-xs: 3px;
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;

    /* Shadows */
    --shadow-card: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-focus: 0 0 0 2px rgba(52, 152, 219, 0.2);
    --shadow-tooltip: 0 2px 8px rgba(0, 0, 0, 0.25);

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --line-height: 1.5;
}

/* ==========================================================================
   2. Reset & Base
   ========================================================================== */

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

body {
    font-family: var(--font-family);
    line-height: var(--line-height);
    color: var(--color-text);
    background-color: var(--color-bg);
    padding: var(--spacing-lg);
}

#app {
    max-width: 1200px;
    margin: 0 auto;
}

h1 {
    margin-bottom: var(--spacing-lg);
    color: var(--color-heading);
}

/* Base link styles */
a {
    color: var(--color-primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* ==========================================================================
   3. Utilities
   ========================================================================== */

.text-truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Page visibility */
.page-hidden {
    display: none;
}

.page-visible {
    display: block;
}

/* ==========================================================================
   4. Layout
   ========================================================================== */

/* Global Header and Navigation */
.global-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-border-medium);
}

.app-title {
    margin-bottom: 0;
    color: var(--color-heading);
}

.global-nav {
    display: flex;
    gap: var(--spacing-lg);
}

.global-nav a {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: background-color 0.2s, color 0.2s;
}

.global-nav a:hover {
    background-color: var(--color-bg-subtle);
    text-decoration: none;
}

.global-nav a.nav-active {
    color: var(--color-heading);
    font-weight: 600;
    background-color: var(--color-bg-subtle);
    cursor: default;
    pointer-events: none;
}

/* Legacy page header (can be removed once pages are migrated) */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-border-medium);
}

.page-header h1 {
    margin-bottom: 0;
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
}

.nav-links a.nav-active {
    color: var(--color-heading);
    font-weight: 600;
    cursor: default;
    pointer-events: none;
}

.nav-separator {
    color: var(--color-border-light);
    margin: 0 5px;
}

/* ==========================================================================
   5. Components
   ========================================================================== */

/* 5.1 Content Cards */
.content-card {
    background: var(--color-bg-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
}

.content-card h2 {
    margin-bottom: 10px;
    color: var(--color-heading);
}

/* 5.2 Buttons */
.btn {
    padding: 10px var(--spacing-lg);
    font-size: 15px;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-bg-card);
}

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

.btn-secondary {
    background-color: #95a5a6;
    color: var(--color-bg-card);
}

.btn-secondary:hover {
    background-color: #7f8c8d;
}

/* 5.3 Forms */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--color-heading);
}

.form-group input[type="number"] {
    width: 100px;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 16px;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-sm);
}

.form-group input[type="number"]:disabled {
    background-color: #f0f0f0;
    color: var(--color-text-light);
    cursor: not-allowed;
}

.form-group textarea {
    width: 100%;
    padding: 10px var(--spacing-sm);
    font-size: 14px;
    font-family: inherit;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-sm);
    resize: vertical;
    min-height: 120px;
}

.form-group textarea::placeholder {
    color: var(--color-placeholder);
}

/* Shared focus styles */
.form-group input[type="number"]:focus,
.form-group textarea:focus,
.dropdown:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: var(--shadow-focus);
}

.form-description {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xl);
}

.form-actions {
    margin-top: var(--spacing-xl);
    display: flex;
    gap: var(--spacing-sm);
}

/* Error Messages */
.field-error {
    display: block;
    color: var(--color-error);
    font-size: 13px;
    margin-top: 5px;
    min-height: 18px;
}

/* 5.4 Dropdowns */
.dropdown {
    width: 100%;
    padding: var(--spacing-2xs) 6px;
    font-family: inherit;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xs);
    background: var(--color-bg-card);
    color: var(--color-text);
    cursor: pointer;
    appearance: menulist;
}

.dropdown:hover {
    border-color: #bbb;
}

.cell-dropdown {
    font-size: 12px;
    text-overflow: ellipsis;
    overflow: hidden;
}

.defaults-dropdown {
    font-size: 11px;
}

/* ==========================================================================
   6. Grid System
   ========================================================================== */

/* Grid Wrapper - Scrollable Viewport */
.grid-wrapper {
    border: 1px solid var(--color-border-medium);
    border-radius: var(--radius-sm);
    max-height: 70vh;
    overflow: auto;
}

/* Timetable Grid */
.timetable-grid {
    display: grid;
    min-width: max-content;
}

/* Grid Cell Base */
.grid-cell {
    border: 1px solid var(--color-border-medium);
    padding: var(--spacing-xs);
    box-sizing: border-box;
    background: var(--color-bg-card);
    min-height: 80px;
}

/* Top Header Row (Teacher names) */
.grid-header {
    position: sticky;
    top: 0;
    z-index: 3;
    background: var(--color-bg);
    font-weight: 600;
    text-align: center;
    min-height: auto;
    padding: var(--spacing-sm) var(--spacing-xs);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 200px;
}

/* Left Header Column (Day/Period labels) */
.grid-row-header {
    position: sticky;
    left: 0;
    z-index: 2;
    background: var(--color-bg-subtle);
    font-weight: 600;
    min-height: auto;
    padding: var(--spacing-sm) var(--spacing-xs);
    display: flex;
    align-items: center;
}

/* Top-Left Corner Cell */
.grid-corner {
    position: sticky;
    top: 0;
    left: 0;
    z-index: 4;
    background: var(--color-bg-corner);
    min-height: auto;
    padding: var(--spacing-sm) var(--spacing-xs);
}

/* Day grouping in row headers */
.row-header-day {
    font-weight: 700;
    color: var(--color-heading);
}

.row-header-period {
    font-weight: 400;
    color: var(--color-text-muted);
    margin-left: var(--spacing-2xs);
}

/* Data cell background and hover */
.grid-data-cell {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xs);
    padding: 6px;
    background: var(--color-bg-card);
}

.grid-data-cell:hover {
    background: #f8f9fa;
}

/* Day group shading - alternating background for each day's periods */
.grid-data-cell[data-day="Tuesday"],
.grid-data-cell[data-day="Thursday"] {
    background-color: var(--color-bg-alt);
}

.grid-data-cell[data-day="Tuesday"]:hover,
.grid-data-cell[data-day="Thursday"]:hover {
    background-color: var(--color-bg);
}

.grid-row-header[data-day="Tuesday"],
.grid-row-header[data-day="Thursday"] {
    background-color: var(--color-bg);
}

/* ==========================================================================
   7. Page-Specific Styles
   ========================================================================== */

/* 7.1 Data Entry */
.data-entry-form {
    max-width: 600px;
}

/* File Operations Section */
.file-operations {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--color-bg-subtle);
    border: 1px solid var(--color-border-medium);
    border-radius: var(--radius-md);
}

.file-operations h3 {
    margin: 0 0 var(--spacing-md) 0;
    font-size: 16px;
    color: var(--color-heading);
}

.file-operations-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

.file-operations-buttons .btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.file-status {
    margin-top: var(--spacing-sm);
    font-size: 14px;
    min-height: 20px;
}

.file-status.success {
    color: var(--color-success);
}

.file-status.error {
    color: var(--color-error);
}

/* Field save buttons */
.field-with-save {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.form-group-inline .field-with-save {
    display: inline-flex;
}

.save-field-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 13px;
    font-weight: 500;
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-sm);
    background: var(--color-bg-card);
    color: var(--color-primary);
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
}

.save-field-btn:hover {
    background-color: var(--color-primary);
    color: var(--color-bg-card);
}

.save-field-btn.save-success {
    background-color: var(--color-success);
    border-color: var(--color-success);
    color: var(--color-bg-card);
}

/* First-time setup */
#first-time-setup {
    max-width: 400px;
}

#first-time-setup h2 {
    margin-bottom: var(--spacing-sm);
}

/* 7.3 Main View */
.empty-state {
    text-align: center;
    padding: 60px var(--spacing-lg);
    color: var(--color-text-muted);
}

.empty-state p {
    margin-bottom: 10px;
    font-size: 16px;
}

.empty-state a {
    font-weight: 600;
}

/* 7.3 Derived Views */
.breadcrumb {
    margin-bottom: var(--spacing-md);
    font-size: 14px;
}

.coming-soon {
    color: var(--color-text-muted);
    font-style: italic;
    padding: 40px 0;
    text-align: center;
}

/* Entity List */
.entity-list {
    list-style: none;
    padding: 0;
    margin: 0;
    max-height: 60vh;
    overflow-y: auto;
    border: 1px solid var(--color-border-medium);
    border-radius: var(--radius-sm);
}

.entity-list li {
    padding: 0;
    margin: 0;
}

.entity-list .entity-link {
    display: block;
    padding: var(--spacing-sm) 16px;
    color: var(--color-text);
    text-decoration: none;
    border-bottom: 1px solid #eee;
    transition: background-color 0.15s;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.entity-list .entity-link:hover {
    background-color: #f5f9fc;
    color: var(--color-primary);
}

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

.no-entities {
    color: var(--color-text-muted);
    padding: var(--spacing-lg) 0;
}

/* Individual Timetable Grid */
.individual-grid-wrapper {
    border: 1px solid var(--color-border-medium);
    border-radius: var(--radius-sm);
    margin-top: var(--spacing-md);
    overflow: auto;
}

.individual-timetable-grid {
    display: grid;
    min-width: max-content;
}

/* Individual Grid Cells */
.individual-grid-corner {
    min-height: auto;
    padding: 10px;
}

.individual-grid-header {
    text-align: center;
    font-weight: 600;
    padding: 10px var(--spacing-xs);
    min-height: auto;
    max-width: none;
}

.individual-grid-row-header {
    font-weight: 600;
    text-align: center;
    padding: 10px var(--spacing-xs);
    min-height: auto;
}

.individual-grid-cell {
    min-height: 70px;
    padding: var(--spacing-xs) 10px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 2px;
}

.individual-cell-line {
    font-size: 13px;
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.cell-label {
    color: var(--color-text-light);
    font-size: 11px;
}

.cell-value {
    color: var(--color-text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    display: inline-block;
    max-width: 120px;
    vertical-align: bottom;
}

.cell-value.empty {
    color: var(--color-border-light);
}

.empty-cell {
    color: var(--color-border-light);
    text-align: center;
    display: block;
}

/* Alternate row shading for individual grid (even periods) */
.individual-grid-cell[data-period="2"],
.individual-grid-cell[data-period="4"],
.individual-grid-cell[data-period="6"],
.individual-grid-cell[data-period="8"],
.individual-grid-cell[data-period="10"],
.individual-grid-cell[data-period="12"],
.individual-grid-cell[data-period="14"],
.individual-grid-cell[data-period="16"],
.individual-grid-cell[data-period="18"],
.individual-grid-cell[data-period="20"] {
    background-color: var(--color-bg-alt);
}

/* ==========================================================================
   8. Teacher Defaults Panel
   ========================================================================== */

.teacher-header {
    display: flex;
    flex-direction: column;
    width: 100%;
}

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

.teacher-header-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
    text-align: center;
}

.defaults-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 2px var(--spacing-2xs);
    font-size: 12px;
    color: var(--color-text-muted);
    transition: transform 0.2s, color 0.2s;
    flex-shrink: 0;
}

.defaults-toggle:hover {
    color: var(--color-primary);
}

.defaults-toggle.expanded {
    transform: rotate(180deg);
}

.defaults-panel {
    display: none;
    flex-direction: column;
    gap: 6px;
    margin-top: var(--spacing-xs);
    padding-top: var(--spacing-xs);
    border-top: 1px solid var(--color-border-medium);
}

.defaults-panel.expanded {
    display: flex;
}

.defaults-apply-btn {
    padding: 5px 10px;
    font-size: 11px;
    font-weight: 500;
    background-color: var(--color-primary);
    color: var(--color-bg-card);
    border: none;
    border-radius: var(--radius-xs);
    cursor: pointer;
    transition: background-color 0.2s;
    margin-top: 2px;
}

.defaults-apply-btn:hover {
    background-color: var(--color-primary-hover);
}

.defaults-apply-btn:active {
    background-color: var(--color-primary-active);
}

/* Adjust header cell for expanded panel */
.grid-header.has-defaults {
    flex-direction: column;
    align-items: stretch;
    min-height: auto;
    padding: 10px var(--spacing-xs);
}

/* Shared inline label editing hint */
.inline-editable-label {
    cursor: text;
}

.inline-editable-label:hover {
    background-color: var(--color-bg-corner);
    border-radius: var(--radius-xs);
}

/* Inline Teacher Editing */

.teacher-header-row--editing {
    display: flex;
    align-items: center;
    gap: 4px;
    width: 100%;
}

.teacher-edit-input {
    flex: 1;
    min-width: 0;
    padding: 2px 4px;
    font-size: 13px;
    font-weight: 600;
    font-family: inherit;
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-xs);
    outline: none;
    box-shadow: var(--shadow-focus);
    text-align: center;
}

.teacher-edit-trash,
.teacher-edit-add {
    background: none;
    border: none;
    cursor: pointer;
    padding: 2px 4px;
    font-size: 14px;
    color: var(--color-text-muted);
    flex-shrink: 0;
    line-height: 1;
    border-radius: var(--radius-xs);
    transition: color 0.15s, background-color 0.15s;
}

.teacher-edit-trash:hover {
    color: var(--color-error);
    background-color: #fdeaea;
}

.teacher-edit-add:hover {
    color: var(--color-primary);
    background-color: #e8f4fd;
}

/* Inline Period Label Editing */
.period-edit-input {
    width: 5em;
    padding: 1px 3px;
    font-size: inherit;
    font-family: inherit;
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-xs);
    background: var(--color-bg-page);
}

/* ==========================================================================
   8.5 Setup Page Sections
   ========================================================================== */

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

.setup-section h2 {
    margin-bottom: var(--spacing-xs);
    color: var(--color-heading);
}

.setup-section .form-description {
    margin-bottom: var(--spacing-lg);
}

/* ==========================================================================
   8.6 Timetables Page (Collapsible Sections)
   ========================================================================== */

.timetables-content h2 {
    margin-bottom: var(--spacing-xs);
}

.timetables-sections {
    margin-top: var(--spacing-lg);
}

.timetable-section {
    margin-bottom: var(--spacing-sm);
    border: 1px solid var(--color-border-medium);
    border-radius: var(--radius-sm);
    background: var(--color-bg-card);
}

.timetable-section-header {
    padding: var(--spacing-sm) 16px;
    font-weight: 600;
    font-size: 16px;
    color: var(--color-heading);
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: background-color 0.15s;
}

.timetable-section-header:hover {
    background-color: var(--color-bg-subtle);
}

.timetable-section-header::before {
    content: '\25B6';
    font-size: 10px;
    color: var(--color-text-muted);
    transition: transform 0.2s;
}

.timetable-section[open] .timetable-section-header::before {
    transform: rotate(90deg);
}

/* Hide default marker */
.timetable-section-header::-webkit-details-marker {
    display: none;
}

.timetable-section-content {
    padding: 0 16px 16px 16px;
}

.timetable-entity-list {
    list-style: none;
    padding: 0;
    margin: 0;
    border: 1px solid var(--color-border-medium);
    border-radius: var(--radius-sm);
    max-height: 300px;
    overflow-y: auto;
}

.timetable-entity-list li {
    margin: 0;
    padding: 0;
}

.timetable-entity-link {
    display: block;
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--color-text);
    text-decoration: none;
    border-bottom: 1px solid #eee;
    transition: background-color 0.15s;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.timetable-entity-link:hover {
    background-color: #f5f9fc;
    color: var(--color-primary);
    text-decoration: none;
}

.timetable-entity-list li:last-child .timetable-entity-link {
    border-bottom: none;
}

/* ==========================================================================
   8.7 Individual Timetable Page
   ========================================================================== */

.individual-timetable-content {
    padding: var(--spacing-xl);
}

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

.individual-timetable-header h2 {
    margin-bottom: 0;
}

.individual-timetable-actions {
    flex-shrink: 0;
}

/* ==========================================================================
   9. States & Modifiers
   ========================================================================== */

/* Conflict Highlighting */
.cell-conflict {
    background-color: #FFF3E0 !important;
}

.cell-conflict:hover {
    background-color: #FFE0B2 !important;
}

.dropdown-conflict {
    border-color: var(--color-warning) !important;
    border-width: 2px !important;
}

/* Conflict Tooltip */
.conflict-tooltip {
    position: fixed;
    background: #424242;
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 12px;
    max-width: 280px;
    z-index: 1000;
    pointer-events: none;
    box-shadow: var(--shadow-tooltip);
    line-height: 1.4;
}

.conflict-tooltip-item {
    margin-bottom: var(--spacing-2xs);
}

.conflict-tooltip-item:last-child {
    margin-bottom: 0;
}

.conflict-tooltip-type {
    font-weight: 600;
    color: #FFB74D;
}

/* ==========================================================================
   10. Print Styles
   ========================================================================== */

@media print {
  /* Page setup */
  @page {
    size: landscape;
    margin: 1cm;
  }

  /* Hide non-essential UI */
  .global-header,
  .page-header,
  .nav-links,
  .global-nav,
  .breadcrumb,
  .defaults-toggle,
  .defaults-panel,
  .file-operations,
  .empty-state,
  .individual-timetable-actions,
  #print-timetable-btn {
    display: none !important;
  }

  /* Show the timetable title prominently */
  .individual-timetable-header {
    margin-bottom: var(--spacing-lg);
  }

  .individual-timetable-header h2 {
    font-size: 18pt;
  }

  /* Remove scroll constraints from grid wrapper */
  .individual-grid-wrapper {
    max-height: none;
    overflow: visible;
    border: none;
  }

  /* Ensure backgrounds print (user must enable in browser) */
  .individual-timetable-grid,
  .individual-grid-cell {
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  /* Optimize text for print */
  body {
    font-size: 11pt;
    color: #000;
    padding: 0;
  }

  /* Remove shadows and unnecessary styling */
  .content-card {
    box-shadow: none;
    border: none;
    padding: 0;
  }

  /* Ensure grid borders are visible */
  .individual-grid-cell,
  .individual-grid-header,
  .individual-grid-row-header,
  .individual-grid-corner {
    border: 1px solid #333;
  }

  /* Improve cell readability in print */
  .individual-cell-line {
    font-size: 10pt;
  }

  .cell-label {
    font-size: 8pt;
  }
}