/* ==========================================
   CSS VARIABLES & DESIGN SYSTEM
   ========================================== */
:root {
    /* Slot height used by calendar - keep in sync with JS calculations */
    --slot-height: 60px;
    /* Colors - Padel Theme */
    --primary-green: #10b981;
    --primary-green-dark: #059669;
    --primary-green-light: #34d399;

    --secondary-blue: #1e40af;
    --secondary-blue-dark: #1e3a8a;
    --secondary-blue-light: #3b82f6;

    /* Status Colors */
    --status-full: #22c55e;
    --status-full-light: #86efac;
    --status-partial: #f59e0b;
    --status-partial-light: #fbbf24;
    --status-empty: #e5e7eb;
    --status-danger: #ef4444;

    /* Neutral Colors */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Typography */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

/* ==========================================
   LOADING OVERLAY
   ========================================== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 99999;
    transition: opacity var(--transition-slow);
}

.loading-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--gray-200);
    border-top-color: var(--primary-green);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-text {
    margin-top: var(--spacing-lg);
    color: var(--gray-700);
    font-size: var(--font-size-lg);
    font-weight: 500;
}

.btn.saving {
    opacity: 0.6;
    pointer-events: none;
    position: relative;
}

.btn.saving::after {
    content: '...';
    position: absolute;
    right: 10px;
}


/* ==========================================
   RESET & BASE STYLES
   ========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--gray-900);
    background: linear-gradient(135deg, var(--gray-50) 0%, #e0f2fe 100%);
    min-height: 100vh;
}

/* ==========================================
   HEADER
   ========================================== */
.header {
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--primary-green-dark) 100%);
    color: white;
    padding: var(--spacing-lg) var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
}

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

.logo-icon {
    font-size: 2.5rem;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-5px);
    }
}

.app-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    letter-spacing: -0.5px;
}

/* ==========================================
   BUTTONS
   ========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

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

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

.btn-primary {
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--primary-green-dark) 100%);
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-green-dark) 0%, #047857 100%);
}

.btn-secondary {
    background: white;
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

.btn-secondary:hover {
    background: var(--gray-50);
    border-color: var(--gray-400);
}

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

.btn-danger:hover {
    background: #dc2626;
}

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

.btn-success:hover {
    background: var(--primary-green-dark);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.btn-icon {
    font-size: var(--font-size-lg);
}

.btn-icon-only {
    background: transparent;
    border: none;
    font-size: var(--font-size-2xl);
    cursor: pointer;
    color: var(--gray-600);
    transition: color var(--transition-fast);
    padding: var(--spacing-xs);
}

.btn-icon-only:hover {
    color: var(--gray-900);
}

.btn-close {
    background: transparent;
    border: none;
    font-size: var(--font-size-2xl);
    cursor: pointer;
    color: var(--gray-500);
    transition: color var(--transition-fast);
    padding: 0;
    line-height: 1;
}

.btn-close:hover {
    color: var(--gray-900);
}

/* ==========================================
   MAIN LAYOUT
   ========================================== */
.main-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: var(--spacing-xl);
    display: flex;
    gap: var(--spacing-xl);
    position: relative;
}

/* ==========================================
   SIDEBAR
   ========================================== */
.sidebar {
    width: 300px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-lg);
    height: fit-content;
    position: sticky;
    top: calc(80px + var(--spacing-xl));
    transition: transform var(--transition-normal);
}

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

.sidebar-header h2 {
    font-size: var(--font-size-xl);
    color: var(--gray-900);
}

.search-box {
    margin-bottom: var(--spacing-md);
}

.search-box input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    transition: border-color var(--transition-fast);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-green);
}

.students-list {
    max-height: 500px;
    overflow-y: auto;
}

.student-card {
    padding: var(--spacing-md);
    background: var(--gray-50);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
}

.student-card:hover {
    background: var(--primary-green-light);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(16, 185, 129, 0.05) 100%);
    border-color: var(--primary-green-light);
    transform: translateX(5px);
}

.student-card h4 {
    font-size: var(--font-size-base);
    color: var(--gray-900);
    margin-bottom: var(--spacing-xs);
}

.student-card p {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
}

.student-card .student-stats {
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-xs);
    color: var(--primary-green-dark);
    font-weight: 600;
}

/* ==========================================
   CALENDAR SECTION
   ========================================== */
.calendar-section {
    flex: 1;
}

.week-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.week-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.week-info h2 {
    font-size: var(--font-size-xl);
    color: var(--gray-900);
}

.quick-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    position: relative;
}

/* Students dropdown */
.students-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    width: 340px;
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 5000;
    overflow: hidden;
}

.students-dropdown .dropdown-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--gray-100);
}

.students-dropdown .dropdown-header h3 {
    margin: 0;
    font-size: var(--font-size-base);
    color: var(--gray-900);
}

.students-dropdown .dropdown-search {
    padding: var(--spacing-sm);
    border-bottom: 1px solid var(--gray-200);
}

.students-dropdown .dropdown-search input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
}

.students-dropdown-list {
    max-height: 320px;
    overflow-y: auto;
}

.students-dropdown-item {
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--gray-100);
    cursor: pointer;
}

.students-dropdown-item:hover {
    background: var(--gray-50);
}

.students-dropdown-item .meta { font-size: 0.85rem; color: var(--gray-600); }

/* Make quick-actions a positioning context for the dropdown */
/* small layout tweak for quick-actions */
.quick-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

/* ==========================================
   CALENDAR GRID
   ========================================== */
.calendar-container {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-lg);
    overflow-x: auto;
}

.calendar-grid {
    display: grid;
    grid-template-columns: 80px repeat(7, 1fr);
    gap: 1px;
    background: var(--gray-200);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    overflow: hidden;
    min-width: 900px;
}

.time-column {
    display: flex;
    flex-direction: column;
    background: var(--gray-50);
}

.time-header {
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--gray-700) 0%, var(--gray-800) 100%);
    color: white;
    font-weight: 600;
    text-align: center;
    font-size: var(--font-size-sm);
}

.time-slot {
    padding: var(--spacing-sm);
    background: var(--gray-50);
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    height: var(--slot-height);
    font-weight: 500;
}

.day-column {
    display: flex;
    flex-direction: column;
}

.day-header {
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--primary-green-dark) 100%);
    color: white;
    font-weight: 600;
    text-align: center;
}

.day-header-name {
    font-size: var(--font-size-base);
    display: block;
}

.day-header-date {
    font-size: var(--font-size-xs);
    opacity: 0.9;
    display: block;
    margin-top: var(--spacing-xs);
}

.calendar-cell {
    background: white;
    height: var(--slot-height);
    position: relative;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.calendar-cell:hover {
    background: var(--gray-50);
}

.calendar-cell.has-class {
    cursor: pointer;
    position: relative;
}

/* ==========================================
   CLASS CARDS IN CALENDAR
   ========================================== */
.class-card {
    padding: 0.35rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    overflow: hidden;
    transition: all var(--transition-normal);
    z-index: 1;
}

.class-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0.1;
    background: linear-gradient(135deg, transparent 0%, rgba(0, 0, 0, 0.1) 100%);
}

.class-card:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-md);
}

/* Resize handle for adjusting class duration */
.class-card .resize-handle {
    position: absolute;
    left: 0;
    right: 0;
    height: 10px;
    bottom: 0;
    cursor: ns-resize;
    background: linear-gradient(90deg, rgba(255,255,255,0.12), rgba(255,255,255,0.02));
    opacity: 0;
    transition: opacity var(--transition-fast);
    z-index: 3;
}

.class-card:hover .resize-handle {
    opacity: 1;
}

/* Floating small panel shown after dragging with Save/Cancel actions */
.drag-save-panel {
    position: fixed;
    right: 20px;
    bottom: 20px;
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow-xl);
    padding: 0.75rem;
    display: flex;
    gap: 0.5rem;
    align-items: center;
    z-index: 20000;
    min-width: 220px;
}
.drag-save-panel .label {
    flex: 1;
    font-size: 0.95rem;
    color: var(--gray-800);
}
.drag-save-panel .actions { display: flex; gap: 0.5rem; }

/* Class Status Colors */
.class-full {
    background: linear-gradient(135deg, var(--status-full) 0%, var(--status-full-light) 100%);
    color: white;
}

.class-partial {
    background: linear-gradient(135deg, var(--status-partial) 0%, var(--status-partial-light) 100%);
    color: white;
}

.class-empty {
    background: var(--status-empty);
    color: var(--gray-700);
}

.class-card-time {
    font-weight: 700;
    font-size: 0.78rem;
    position: absolute;
    top: 6px;
    left: 8px;
    line-height: 1;
}

.class-card-occupancy {
    font-weight: 800;
    font-size: 0.95rem;
    position: absolute;
    top: 70%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 4px 8px;
    border-radius: 10px;
    background: rgba(255,255,255,0.12);
    color: white;
    text-align: center;
    line-height: 1;
    box-shadow: 0 2px 6px rgba(0,0,0,0.12);
}

.class-card-students {
    font-size: 0.82rem;
    opacity: 0.95;
    position: absolute;
    bottom: 6px;
    left: 8px;
    right: 8px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ==========================================
   LEGEND
   ========================================== */
.legend {
    display: flex;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
}

.legend-color {
    width: 30px;
    height: 20px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
}

/* ==========================================
   MODALS
   ========================================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 10000;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    animation: fadeIn var(--transition-fast);
}

.modal.active {
    display: flex;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.modal-content {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp var(--transition-normal);
    animation-fill-mode: forwards;
}

@keyframes slideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-200);
}

.modal-header h3 {
    font-size: var(--font-size-xl);
    color: var(--gray-900);
}

.modal-actions {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--gray-200);
    justify-content: flex-end;
}

/* ==========================================
   FORMS
   ========================================== */
form {
    padding: var(--spacing-lg);
}

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

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--gray-700);
    font-size: var(--font-size-sm);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    transition: all var(--transition-fast);
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-green);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.students-selector {
    max-height: 200px;
    overflow-y: auto;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.student-checkbox {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

.student-checkbox:hover {
    background: var(--gray-50);
}

.student-checkbox input[type="checkbox"] {
    width: auto;
    cursor: pointer;
}

.student-checkbox label {
    margin: 0;
    cursor: pointer;
    flex: 1;
    font-weight: 400;
}

/* Selected students area in class modal */
.selected-students {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 0.5rem;
}

.student-pill {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    padding: 0.35rem 0.6rem;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.student-search-item button.btn {
    white-space: nowrap;
}

/* ==========================================
   CLASS DETAILS
   ========================================== */
.class-details-content {
    padding: var(--spacing-lg);
}

.detail-row {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--gray-100);
}

.detail-label {
    font-weight: 600;
    color: var(--gray-700);
}

.detail-value {
    color: var(--gray-900);
}

.students-in-class {
    margin-top: var(--spacing-lg);
}

.students-in-class h4 {
    margin-bottom: var(--spacing-md);
    color: var(--gray-900);
}

.student-item {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--gray-50);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.student-item::before {
    content: '👤';
}

/* ==========================================
   TOAST NOTIFICATIONS
   ========================================== */
.toast-container {
    position: fixed;
    top: 100px;
    right: var(--spacing-xl);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.toast {
    background: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    min-width: 300px;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    animation: slideInRight var(--transition-normal);
}

@keyframes slideInRight {
    from {
        transform: translateX(400px);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast-success {
    border-left: 4px solid var(--status-full);
}

.toast-error {
    border-left: 4px solid var(--status-danger);
}

.toast-icon {
    font-size: var(--font-size-xl);
}

.toast-message {
    flex: 1;
    font-size: var(--font-size-sm);
    color: var(--gray-900);
}

/* ==========================================
   RESPONSIVE DESIGN
   ========================================== */
@media (max-width: 1024px) {
    .sidebar {
        position: fixed;
        left: -350px;
        top: 0;
        height: 100vh;
        z-index: 500;
        box-shadow: var(--shadow-xl);
    }

    .sidebar.active {
        transform: translateX(350px);
    }

    .main-container {
        padding: var(--spacing-md);
    }

    .week-navigation {
        flex-direction: column;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }

    .app-title {
        font-size: var(--font-size-xl);
    }

    .quick-actions {
        flex-direction: column;
    }

    .quick-actions .btn {
        width: 100%;
        justify-content: center;
    }

    .calendar-grid {
        font-size: var(--font-size-xs);
    }

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

    .toast-container {
        right: var(--spacing-md);
        left: var(--spacing-md);
    }

    .toast {
        min-width: auto;
    }
}

/* ==========================================
   UTILITY CLASSES
   ========================================== */
.hidden {
    display: none !important;
}

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

.mt-1 {
    margin-top: var(--spacing-md);
}

.mb-1 {
    margin-bottom: var(--spacing-md);
}

/* ==========================================
   LOGIN SCREEN
   ========================================== */
.login-screen {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--primary-green-dark) 100%);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    animation: fadeIn var(--transition-normal);
}

.login-container {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-2xl);
    max-width: 600px;
    width: 90%;
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.login-logo {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    animation: bounce 2s ease-in-out infinite;
}

.login-header h1 {
    font-size: var(--font-size-3xl);
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.login-header p {
    color: var(--gray-600);
    font-size: var(--font-size-lg);
}

.login-roles {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.role-card {
    background: linear-gradient(135deg, var(--gray-50) 0%, white 100%);
    border: 3px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.role-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-green);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.05) 0%, white 100%);
}

.role-icon {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
}

.role-card h2 {
    font-size: var(--font-size-xl);
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.role-card p {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
}

/* ==========================================
   HEADER MULTI-USER
   ========================================== */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.user-display {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
}

/* ==========================================
   COORDINATOR DASHBOARD
   ========================================== */
.coordinator-dashboard {
    flex: 1;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.dashboard-header h2 {
    font-size: var(--font-size-2xl);
    color: var(--gray-900);
}

.monitors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

/* ==========================================
   MONITOR CARDS
   ========================================== */
.monitor-card {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: all var(--transition-normal);
    border: 2px solid transparent;
}

.monitor-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-green-light);
}

.monitor-card-header {
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--primary-green-dark) 100%);
    padding: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.monitor-card-header h3 {
    color: white;
    font-size: var(--font-size-xl);
    margin: 0;
}

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

.btn-icon-sm {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: var(--font-size-lg);
}

.btn-icon-sm:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.btn-danger-sm {
    background: rgba(239, 68, 68, 0.3);
}

.btn-danger-sm:hover {
    background: rgba(239, 68, 68, 0.5);
}

.monitor-card-info {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-200);
}

.monitor-card-info p {
    margin: var(--spacing-sm) 0;
    color: var(--gray-700);
    font-size: var(--font-size-sm);
}

.monitor-card-stats {
    padding: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-lg);
    background: var(--gray-50);
}

.stat-item {
    flex: 1;
    text-align: center;
}

.stat-value {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--primary-green);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ==========================================
   CLASS CARD MONITOR NAME
   ========================================== */
.class-card-monitor {
    font-size: var(--font-size-xs);
    opacity: 0.9;
    font-weight: 500;
    margin-top: var(--spacing-xs);
}

/* ==========================================
   RESPONSIVE - MULTI-USER
   ========================================== */
@media (max-width: 768px) {
    .login-roles {
        grid-template-columns: 1fr;
    }

    .monitors-grid {
        grid-template-columns: 1fr;
    }

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

    .dashboard-header {
        flex-direction: column;
        gap: var(--spacing-md);
    }
}

/* ==========================================
   STUDENT LEVEL BADGE
   ========================================== */
.level-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-green), var(--primary-green-light));
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: var(--font-size-xs);
    font-weight: 600;
    margin-left: 0.5rem;
    box-shadow: 0 2px 4px rgba(16, 185, 129, 0.2);
}

/* Responsive styles for mobile devices */
@media (max-width: 768px) {
  body {
    font-size: 14px;
    padding: 10px;
  }

  .contenedor {
    flex-direction: column;
    padding: 5px;
  }

  nav {
    display: flex;
    flex-direction: column;
  }
}

/* Ensure images are responsive */
img {
  max-width: 100%;
  height: auto;
}

/* Improve touch targets for buttons and links */
button, a {
  padding: 10px 20px;
  font-size: 16px;
}

/* Estilos para pantallas grandes */
.sidebar {
    display: block;
    width: 300px;
    position: fixed;
    left: 0;
    top: 0;
    height: 100%;
    background-color: #f8f9fa;
    overflow-y: auto;
    z-index: 1000;
}

/* Estilos para pantallas pequeñas */
@media (max-width: 768px) {
    .sidebar {
        display: none; /* Oculta el panel en pantallas pequeñas */
    }

    .sidebar.open {
        display: block; /* Muestra el panel cuando está abierto */
        position: absolute;
        width: 100%;
        height: auto;
        z-index: 1000;
    }
}