/* ============================================
   LEAVE MANAGEMENT SYSTEM - ENHANCED STYLES
   ============================================ */

/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
    /* Primary Colors */
    --primary-color: #007bff;
    --primary-hover: #0056b3;
    --primary-light: #e7f1ff;
    
    /* Secondary Colors */
    --secondary-color: #6c757d;
    --secondary-hover: #5a6268;
    
    /* Status Colors */
    --success-color: #28a745;
    --success-light: #d4edda;
    --error-color: #dc3545;
    --error-light: #f8d7da;
    --warning-color: #ffc107;
    --warning-light: #fff3cd;
    --info-color: #17a2b8;
    --info-light: #d1ecf1;
    
    /* Background Colors */
    --card-bg: #ffffff;
    --page-bg: #f4f7f6;
    --hover-bg: #f8f9fa;
    
    /* Text Colors */
    --text-color: #333;
    --text-muted: #6c757d;
    --text-light: #999;
    
    /* Border Colors */
    --border-color: #ddd;
    --border-light: #e9ecef;
    
    /* Shadow */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 20px rgba(0,0,0,0.15);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

/* ============================================
   BASIC SETUP
   ============================================ */
* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--page-bg);
    margin: 0;
    padding: 0;
    color: var(--text-color);
    line-height: 1.6;
}

main {
    padding: 20px;
    max-width: 1200px;
    margin: 20px auto;
}

/* ============================================
   HEADER AND NAVIGATION
   ============================================ */
header {
    background-color: var(--card-bg);
    border-bottom: 2px solid var(--border-light);
    padding: 0 20px;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

nav h1 {
    color: var(--primary-color);
    margin: 15px 0;
    font-size: 1.5em;
    cursor: pointer;
    transition: color var(--transition-fast);
}

nav h1:hover {
    color: var(--primary-hover);
}

.nav-links {
    display: flex;
    gap: 10px;
    align-items: center;
}

.nav-button {
    background: none;
    border: none;
    padding: 15px 10px;
    cursor: pointer;
    font-size: 16px;
    color: var(--text-muted);
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-button:hover {
    color: var(--primary-color);
}

.nav-button::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width var(--transition-normal);
}

.nav-button:hover::after {
    width: 80%;
}

/* ============================================
   DROPDOWN MENU
   ============================================ */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: var(--card-bg);
    min-width: 180px;
    box-shadow: var(--shadow-md);
    z-index: 1001;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-light);
    animation: fadeIn 0.2s ease;
}

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

.dropdown-content a {
    color: var(--text-color);
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    transition: background-color var(--transition-fast);
}

.dropdown-content a:hover { 
    background-color: var(--hover-bg);
    color: var(--primary-color);
}

.dropdown:hover .dropdown-content { 
    display: block; 
}

/* ============================================
   CARD AND VIEW STYLING
   ============================================ */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow-md);
    max-width: 600px;
    margin: 0 auto;
}

.view {
    margin-top: 20px;
    animation: slideIn 0.3s ease;
}

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

/* ============================================
   FORM STYLING
   ============================================ */
form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

form label {
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 5px;
    display: block;
}

form input[type="text"],
form input[type="email"],
form input[type="password"],
form input[type="tel"],
form input[type="number"],
form input[type="date"],
form input[type="month"],
form select,
form textarea {
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    width: 100%;
    background-color: var(--card-bg);
    transition: all var(--transition-fast);
    font-family: inherit;
}

form select {
    cursor: pointer;
}

form textarea {
    min-height: 100px;
    resize: vertical;
}

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

form select option {
    padding: 10px;
}

/* Button Styles */
form button,
.btn,
.secondary-btn,
.btn-approve,
.btn-reject,
.btn-delete {
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
    display: inline-block;
    text-decoration: none;
}

form button,
.btn {
    background-color: var(--primary-color);
    color: white;
}

form button:hover,
.btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

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

.btn-approve {
    background-color: var(--success-color);
    color: white;
}

.btn-approve:hover {
    background-color: #218838;
}

.btn-reject {
    background-color: var(--error-color);
    color: white;
}

.btn-reject:hover {
    background-color: #c82333;
}

.btn-delete {
    background-color: var(--error-color);
    color: white;
}

.btn-delete:hover {
    background-color: #c82333;
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* ============================================
   MESSAGE STYLES
   ============================================ */
.message {
    padding: 12px 20px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95em;
    margin: 15px 0;
    display: none;
    animation: slideIn 0.3s ease;
}

.message.success { 
    background-color: var(--success-light);
    color: var(--success-color);
    border-left: 4px solid var(--success-color);
}

.message.error { 
    background-color: var(--error-light);
    color: var(--error-color);
    border-left: 4px solid var(--error-color);
}

.message.warning { 
    background-color: var(--warning-light);
    color: #856404;
    border-left: 4px solid var(--warning-color);
}

.message.info { 
    background-color: var(--info-light);
    color: #0c5460;
    border-left: 4px solid var(--info-color);
}

/* ============================================
   CALENDAR STYLES
   ============================================ */
#leave-calendar,
#update-leave-calendar,
#calendar {
    margin-bottom: 20px;
}

.flatpickr-calendar {
    width: 100%;
    box-shadow: var(--shadow-md);
    border-radius: 12px;
}

/* Base style for all days */
.flatpickr-day {
    position: relative;
    border-radius: 6px !important;
}

/* Slot information indicator */
.slot-info,
.slots-indicator {
    position: absolute;
    bottom: 2px;
    right: 2px;
    font-size: 9px;
    font-weight: bold;
    color: #333;
    background: rgba(255, 255, 255, 0.9);
    padding: 2px 4px;
    border-radius: 3px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* Partially available days (light green) */
.day-partial,
.flatpickr-day.almost-full {
    background: #fff8dc !important;
    border-color: #ffd700 !important;
    color: #333 !important;
}

.day-partial:hover,
.flatpickr-day.almost-full:hover {
    background: #ffeb99 !important;
}

/* Special dates with custom limits (yellow) */
.day-special {
    background: var(--warning-light) !important;
    border: 2px solid var(--warning-color) !important;
    color: #333 !important;
}

.day-special:hover {
    background: #ffe69c !important;
}

/* Fully booked days (red/grey) */
.day-unavailable,
.flatpickr-day.fully-booked {
    background: #ffe0e0 !important;
    border-color: #ff9999 !important;
    color: #999 !important;
    text-decoration: line-through;
    cursor: not-allowed !important;
}

.flatpickr-day.flatpickr-disabled {
    cursor: not-allowed !important;
}

/* Already applied dates (GREEN) */
.flatpickr-day.flatpickr-disabled.day-already-applied {
    background-color: var(--success-light) !important;
    border: 2px solid var(--success-color) !important;
    color: #155724 !important;
    cursor: not-allowed !important;
    font-weight: 600;
}

.flatpickr-day.flatpickr-disabled.day-already-applied:hover {
    background-color: #c3e6cb !important;
    border-color: #218838 !important;
}

.flatpickr-day.day-already-applied .slot-info {
    display: none;
}

/* Selected dates (RED) */
.flatpickr-day.selected,
.flatpickr-day.selected.day-partial {
    background: var(--error-color) !important;
    border-color: var(--error-color) !important;
    color: #fff !important;
}

.flatpickr-day.selected:hover,
.flatpickr-day.selected.day-partial:hover {
    background: #c82333 !important;
    border-color: #c82333 !important;
}

.flatpickr-day.selected .slot-info {
    background: rgba(255, 255, 255, 0.95);
    color: #333;
}

/* ============================================
   DASHBOARD STYLES
   ============================================ */
#dashboard-view {
    max-width: 1200px;
}

.dashboard-section {
    margin-bottom: 40px;
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.dashboard-section h2 {
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: 20px;
    font-size: 1.8em;
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 10px;
}

.dashboard-section h3 {
    color: var(--text-color);
    margin-top: 25px;
    margin-bottom: 15px;
    font-size: 1.3em;
}

/* Dashboard Stats Cards */
.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: transform var(--transition-fast);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-card h3 {
    margin: 0 0 10px 0;
    font-size: 1em;
    opacity: 0.9;
    color: white;
}

.stat-card p {
    margin: 0;
    font-size: 2.5em;
    font-weight: bold;
}

.stat-card.success {
    background: linear-gradient(135deg, var(--success-color), #218838);
}

.stat-card.warning {
    background: linear-gradient(135deg, var(--warning-color), #e0a800);
}

.stat-card.info {
    background: linear-gradient(135deg, var(--info-color), #138496);
}

/* Settings Display */
.settings-info {
    background-color: var(--hover-bg);
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
    margin: 20px 0;
}

.settings-info p {
    margin: 10px 0;
    font-size: 1em;
}

.settings-info strong {
    color: var(--primary-color);
}

.settings-info ul {
    margin: 10px 0;
    padding-left: 25px;
}

.settings-info li {
    margin: 8px 0;
}

/* Settings History Table */
.settings-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    box-shadow: var(--shadow-sm);
    border-radius: 8px;
    overflow: hidden;
}

.settings-table thead {
    background-color: var(--primary-color);
    color: white;
}

.settings-table th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
}

.settings-table td {
    padding: 12px 15px;
    border-bottom: 1px solid var(--border-light);
}

.settings-table tbody tr:hover {
    background-color: var(--hover-bg);
}

.settings-table tbody tr:last-child td {
    border-bottom: none;
}

/* Special Dates Configuration */
#special-dates-container {
    margin-top: 20px;
}

.special-date-row,
.special-date-item {
    margin-bottom: 15px;
    padding: 20px;
    background-color: var(--hover-bg);
    border-radius: 8px;
    border: 1px solid var(--border-light);
    transition: all var(--transition-fast);
}

.special-date-row:hover,
.special-date-item:hover {
    box-shadow: var(--shadow-sm);
}

.special-date-fields {
    display: grid;
    grid-template-columns: 1fr 1fr auto;
    gap: 15px;
    align-items: end;
}

.special-date-fields > div {
    display: flex;
    flex-direction: column;
}

.special-date-fields label {
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-color);
}

.special-date-fields input {
    padding: 10px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    transition: border-color var(--transition-fast);
}

.special-date-fields input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.remove-date-btn,
.remove-special-date {
    background-color: var(--error-color);
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    white-space: nowrap;
    transition: all var(--transition-fast);
}

.remove-date-btn:hover,
.remove-special-date:hover {
    background-color: #c82333;
    transform: translateY(-2px);
}

/* Teachers Grid */
.teachers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.teacher-card {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

.teacher-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.teacher-card p {
    margin: 10px 0;
    font-size: 14px;
}

.teacher-card strong {
    color: var(--primary-color);
    font-size: 1.1em;
}

/* Leave Cards */
.leave-card {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    margin-bottom: 20px;
    transition: all var(--transition-fast);
}

.leave-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.leave-card h4 {
    margin: 0 0 10px 0;
    color: var(--primary-color);
}

.leave-card p {
    margin: 8px 0;
}

.action-buttons {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

.action-buttons button {
    flex: 1;
}

/* Leave History Table */
.leave-history-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    box-shadow: var(--shadow-sm);
    border-radius: 8px;
    overflow: hidden;
}

.leave-history-table thead {
    background-color: var(--primary-color);
    color: white;
}

.leave-history-table th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
}

.leave-history-table td {
    padding: 12px 15px;
    border-bottom: 1px solid var(--border-light);
}

.leave-history-table tbody tr:hover {
    background-color: var(--hover-bg);
}

.leave-history-table tbody tr:last-child td {
    border-bottom: none;
}

/* Status Badges */
.status-pending {
    background-color: var(--warning-light);
    color: #856404;
    padding: 4px 12px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 0.85em;
}

.status-approved {
    background-color: var(--success-light);
    color: var(--success-color);
    padding: 4px 12px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 0.85em;
}

.status-rejected {
    background-color: var(--error-light);
    color: var(--error-color);
    padding: 4px 12px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 0.85em;
}

/* Utility Classes */
.no-data {
    text-align: center;
    color: var(--text-muted);
    padding: 40px 20px;
    font-style: italic;
    font-size: 1.1em;
}

#selected-date-display {
    color: var(--primary-color);
    font-weight: bold;
}

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

.mb-20 {
    margin-bottom: 20px;
}

.mt-20 {
    margin-top: 20px;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .nav-links {
        flex-wrap: wrap;
        margin-top: 10px;
    }
    
    main {
        padding: 15px;
        margin: 10px auto;
    }
    
    .card {
        padding: 20px;
    }
    
    .dashboard-section {
        padding: 20px;
    }
    
    .special-date-fields {
        grid-template-columns: 1fr;
    }
    
    .teachers-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-container {
        grid-template-columns: 1fr;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .settings-table,
    .leave-history-table {
        font-size: 14px;
    }
    
    .settings-table th,
    .settings-table td,
    .leave-history-table th,
    .leave-history-table td {
        padding: 10px;
    }
}

@media (max-width: 480px) {
    nav h1 {
        font-size: 1.2em;
    }
    
    .nav-button {
        font-size: 14px;
        padding: 12px 8px;
    }
    
    .dashboard-section h2 {
        font-size: 1.4em;
    }
    
    form button,
    .btn {
        font-size: 14px;
        padding: 10px 15px;
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
    header,
    .nav-button,
    .action-buttons,
    .btn,
    button {
        display: none !important;
    }
    
    body {
        background-color: white;
    }
    
    .card,
    .dashboard-section {
        box-shadow: none;
        border: 1px solid #000;
    }
}

/* ============================================
   LOADING SPINNER
   ============================================ */
.spinner {
    border: 4px solid var(--border-light);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

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

/* ============================================
   PASSWORD TOGGLE
   ============================================ */
.password-container {
    position: relative;
}

.password-toggle {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2em;
    padding: 5px;
    color: var(--text-muted);
}

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