/* 
 * base.css - Core styles and variables
 * This file provides the foundation for the entire UI
 */

 :root {
    /* Color Variables */
    --color-primary: #3498db;
    --color-secondary: #2ecc71;
    --color-danger: #e74c3c;
    --color-warning: #f39c12;
    --color-info: #17a2b8;
    --color-dark: #2c3e50;
    --color-light: #f8f9fa;
    --color-gray: #6c757d;
    
    /* Status colors for attendance */
    --color-statusPresent: #28a745;
    --color-statusAbsent: #dc3545;
    --color-statusTardy: #ffc107;
    --color-statusEarly: #6c757d;
    --color-statusSick: #17a2b8;
    
    /* UI colors */
    --color-background: #f8f9fa;
    --color-cardBg: #ffffff;
    --color-textPrimary: #333333;
    --color-textSecondary: #6c757d;
    --color-border: #dee2e6;
    --color-shadow: rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    --font-size-small: 0.875rem;
    --font-size-base: 1rem;
    --font-size-large: 1.25rem;
    --font-size-heading: 1.5rem;
    --font-size-title: 2rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Border radius */
    --radius-small: 4px;
    --radius-medium: 8px;
    --radius-large: 12px;
    --radius-circle: 50%;
    
    /* Box shadow */
    --shadow-small: 0 2px 4px var(--color-shadow);
    --shadow-medium: 0 4px 8px var(--color-shadow);
    --shadow-large: 0 8px 16px var(--color-shadow);
    
    /* Transitions */
    --transition-fast: all 0.2s ease;
    --transition-medium: all 0.3s ease;
    --transition-slow: all 0.5s ease;
}

/* Dark mode theme overrides */
body.dark-mode {
    --color-primary: #3498db;
    --color-secondary: #2ecc71;
    --color-danger: #e74c3c;
    --color-warning: #f39c12;
    --color-info: #17a2b8;
    --color-dark: #1a1a1a;
    --color-light: #343a40;
    --color-gray: #6c757d;
    
    /* Status colors - slightly less saturated for dark mode */
    --color-statusPresent: #2a9d47;
    --color-statusAbsent: #c82333;
    --color-statusTardy: #e0a800;
    --color-statusEarly: #5a6268;
    --color-statusSick: #138496;
    
    /* UI colors */
    --color-background: #121212;
    --color-cardBg: #2a2a2a;
    --color-textPrimary: #f8f9fa;
    --color-textSecondary: #adb5bd;
    --color-border: #444444;
    --color-shadow: rgba(0, 0, 0, 0.3);
}

/* Reset & Base Styles */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    height: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-textPrimary);
    background-color: var(--color-background);
    min-height: 100%;
    position: relative;
    overflow-x: hidden;
    transition: var(--transition-medium);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    margin-bottom: var(--spacing-md);
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-textPrimary);
}

h1 {
    font-size: var(--font-size-title);
}

h2 {
    font-size: var(--font-size-heading);
}

h3 {
    font-size: var(--font-size-large);
}

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition-fast);
}

a:hover {
    color: var(--color-primary);
    opacity: 0.8;
}

/* Layout */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 calc(-1 * var(--spacing-sm));
}

.col {
    flex: 1 0 0%;
    padding: 0 var(--spacing-sm);
}

/* For specific column widths */
.col-auto {
    flex: 0 0 auto;
    width: auto;
}

.col-12 {
    flex: 0 0 auto;
    width: 100%;
}

.col-6 {
    flex: 0 0 auto;
    width: 50%;
}

.col-4 {
    flex: 0 0 auto;
    width: 33.333333%;
}

.col-3 {
    flex: 0 0 auto;
    width: 25%;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .col-md-12 {
        flex: 0 0 auto;
        width: 100%;
    }
    
    .col-md-6 {
        flex: 0 0 auto;
        width: 50%;
    }
}

@media (max-width: 576px) {
    .col-sm-12 {
        flex: 0 0 auto;
        width: 100%;
    }
}

/* Card Component */
.card {
    background-color: var(--color-cardBg);
    border-radius: var(--radius-medium);
    box-shadow: var(--shadow-small);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    transition: var(--transition-medium);
}

.card:hover {
    box-shadow: var(--shadow-medium);
}

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

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

.card-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

/* Form Elements */
.form-group {
    margin-bottom: var(--spacing-md);
}

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

.form-control {
    display: block;
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--color-textPrimary);
    background-color: var(--color-cardBg);
    background-clip: padding-box;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-small);
    transition: var(--transition-fast);
}

.form-control:focus {
    border-color: var(--color-primary);
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.25);
}

select.form-control {
    padding-right: 2.5rem;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%233498db' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 16px 12px;
}

.form-check {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.form-check-input {
    margin-right: var(--spacing-sm);
    width: 1rem;
    height: 1rem;
}

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

/* Buttons */
.btn {
    display: inline-block;
    font-weight: 500;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    user-select: none;
    border: 1px solid transparent;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    line-height: 1.5;
    border-radius: var(--radius-small);
    transition: var(--transition-fast);
    cursor: pointer;
}

.btn:disabled {
    opacity: 0.65;
    cursor: not-allowed;
}

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

.btn-primary:hover {
    filter: brightness(90%);
}

.btn-secondary {
    color: #fff;
    background-color: var(--color-secondary);
    border-color: var(--color-secondary);
}

.btn-secondary:hover {
    filter: brightness(90%);
}

.btn-danger {
    color: #fff;
    background-color: var(--color-danger);
    border-color: var(--color-danger);
}

.btn-danger:hover {
    filter: brightness(90%);
}

.btn-warning {
    color: #fff;
    background-color: var(--color-warning);
    border-color: var(--color-warning);
}

.btn-warning:hover {
    filter: brightness(90%);
}

.btn-info {
    color: #fff;
    background-color: var(--color-info);
    border-color: var(--color-info);
}

.btn-info:hover {
    filter: brightness(90%);
}

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

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

.btn-sm {
    padding: calc(var(--spacing-xs) * 1.5) var(--spacing-sm);
    font-size: var(--font-size-small);
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-large);
}

/* Tables */
.table {
    width: 100%;
    margin-bottom: var(--spacing-md);
    color: var(--color-textPrimary);
    border-collapse: collapse;
}

.table th,
.table td {
    padding: var(--spacing-sm) var(--spacing-md);
    vertical-align: top;
    border-top: 1px solid var(--color-border);
    text-align: left;
}

.table thead th {
    vertical-align: bottom;
    border-bottom: 2px solid var(--color-border);
    background-color: var(--color-light);
    font-weight: 600;
}

.table-striped tbody tr:nth-of-type(odd) {
    background-color: rgba(0, 0, 0, 0.03);
}

.table-hover tbody tr:hover {
    background-color: rgba(0, 0, 0, 0.075);
}

/* Message Box */
.message-container {
    margin-bottom: var(--spacing-md);
}

.message {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border-radius: var(--radius-medium);
    position: relative;
    animation: messageAppear 0.3s ease;
}

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

.message.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.message.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.message.warning {
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeeba;
}

.message.info {
    background-color: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

.message.fade-out {
    animation: messageFadeOut 0.5s ease forwards;
}

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

/* Spinners */
.spinner {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s linear infinite;
    vertical-align: middle;
}

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

/* Utilities */
.text-primary { color: var(--color-primary) !important; }
.text-secondary { color: var(--color-secondary) !important; }
.text-danger { color: var(--color-danger) !important; }
.text-warning { color: var(--color-warning) !important; }
.text-info { color: var(--color-info) !important; }
.text-light { color: var(--color-light) !important; }
.text-dark { color: var(--color-textPrimary) !important; }
.text-muted { color: var(--color-textSecondary) !important; }

.bg-primary { background-color: var(--color-primary) !important; }
.bg-secondary { background-color: var(--color-secondary) !important; }
.bg-danger { background-color: var(--color-danger) !important; }
.bg-warning { background-color: var(--color-warning) !important; }
.bg-info { background-color: var(--color-info) !important; }
.bg-light { background-color: var(--color-light) !important; }
.bg-dark { background-color: var(--color-dark) !important; }

.text-center { text-align: center !important; }
.text-right { text-align: right !important; }
.text-left { text-align: left !important; }

.d-flex { display: flex !important; }
.d-block { display: block !important; }
.d-none { display: none !important; }
.d-inline-block { display: inline-block !important; }

.flex-column { flex-direction: column !important; }
.flex-row { flex-direction: row !important; }
.justify-content-between { justify-content: space-between !important; }
.justify-content-center { justify-content: center !important; }
.justify-content-start { justify-content: flex-start !important; }
.justify-content-end { justify-content: flex-end !important; }
.align-items-center { align-items: center !important; }
.align-items-start { align-items: flex-start !important; }
.align-items-end { align-items: flex-end !important; }
.flex-wrap { flex-wrap: wrap !important; }
.flex-grow-1 { flex-grow: 1 !important; }

.w-100 { width: 100% !important; }
.h-100 { height: 100% !important; }

.m-0 { margin: 0 !important; }
.mt-1 { margin-top: var(--spacing-xs) !important; }
.mt-2 { margin-top: var(--spacing-sm) !important; }
.mt-3 { margin-top: var(--spacing-md) !important; }
.mt-4 { margin-top: var(--spacing-lg) !important; }
.mb-1 { margin-bottom: var(--spacing-xs) !important; }
.mb-2 { margin-bottom: var(--spacing-sm) !important; }
.mb-3 { margin-bottom: var(--spacing-md) !important; }
.mb-4 { margin-bottom: var(--spacing-lg) !important; }
.ml-1 { margin-left: var(--spacing-xs) !important; }
.ml-2 { margin-left: var(--spacing-sm) !important; }
.ml-3 { margin-left: var(--spacing-md) !important; }
.ml-4 { margin-left: var(--spacing-lg) !important; }
.mr-1 { margin-right: var(--spacing-xs) !important; }
.mr-2 { margin-right: var(--spacing-sm) !important; }
.mr-3 { margin-right: var(--spacing-md) !important; }
.mr-4 { margin-right: var(--spacing-lg) !important; }

.p-0 { padding: 0 !important; }
.p-1 { padding: var(--spacing-xs) !important; }
.p-2 { padding: var(--spacing-sm) !important; }
.p-3 { padding: var(--spacing-md) !important; }
.p-4 { padding: var(--spacing-lg) !important; }
.pt-1 { padding-top: var(--spacing-xs) !important; }
.pt-2 { padding-top: var(--spacing-sm) !important; }
.pt-3 { padding-top: var(--spacing-md) !important; }
.pt-4 { padding-top: var(--spacing-lg) !important; }
.pb-1 { padding-bottom: var(--spacing-xs) !important; }
.pb-2 { padding-bottom: var(--spacing-sm) !important; }
.pb-3 { padding-bottom: var(--spacing-md) !important; }
.pb-4 { padding-bottom: var(--spacing-lg) !important; }

.rounded { border-radius: var(--radius-small) !important; }
.rounded-circle { border-radius: 50% !important; }
.rounded-lg { border-radius: var(--radius-medium) !important; }

.shadow-sm { box-shadow: var(--shadow-small) !important; }
.shadow { box-shadow: var(--shadow-medium) !important; }
.shadow-lg { box-shadow: var(--shadow-large) !important; }

/* Responsive utilities */
@media (min-width: 576px) {
    .d-sm-none { display: none !important; }
    .d-sm-block { display: block !important; }
    .d-sm-flex { display: flex !important; }
}

@media (min-width: 768px) {
    .d-md-none { display: none !important; }
    .d-md-block { display: block !important; }
    .d-md-flex { display: flex !important; }
}

@media (min-width: 992px) {
    .d-lg-none { display: none !important; }
    .d-lg-block { display: block !important; }
    .d-lg-flex { display: flex !important; }
}

/* Mobile optimizations */
@media (max-width: 576px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .card-header,
    .card-body,
    .card-footer {
        padding: var(--spacing-sm);
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .form-actions .btn {
        width: 100%;
        margin-bottom: var(--spacing-xs);
    }
    
    .table-responsive {
        display: block;
        width: 100%;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
}