/* Pompillo - Premium Attendance Management System */
/* Design System & Global Styles - PREMIUM LIGHT THEME */

:root {
    /* Color Palette - Vibrant Light Theme */
    --primary-hue: 250;
    --primary: hsl(var(--primary-hue), 85%, 60%);
    --primary-light: hsl(var(--primary-hue), 85%, 70%);
    --primary-dark: hsl(var(--primary-hue), 85%, 50%);
    --primary-glow: hsl(var(--primary-hue), 100%, 65%);

    --accent: hsl(165, 80%, 45%);
    --accent-light: hsl(165, 80%, 55%);

    --danger: hsl(0, 75%, 55%);
    --danger-dark: hsl(0, 75%, 45%);
    --warning: hsl(40, 95%, 50%);
    --success: hsl(150, 75%, 40%);

    /* Background Layers - Clean White/Light */
    --bg-base: hsl(220, 30%, 97%);
    --bg-surface: hsl(0, 0%, 100%);
    --bg-elevated: hsl(220, 25%, 95%);
    --bg-card: hsl(0, 0%, 100%);
    --bg-hover: hsl(220, 30%, 93%);

    /* Glass Effect - Light Glass */
    --glass-bg: hsla(0, 0%, 100%, 0.85);
    --glass-border: hsla(220, 30%, 80%, 0.5);

    /* Text Colors */
    --text-primary: hsl(220, 30%, 20%);
    --text-secondary: hsl(220, 20%, 45%);
    --text-muted: hsl(220, 15%, 60%);

    /* Borders & Shadows */
    --border-subtle: hsla(220, 20%, 85%, 0.8);
    --border-focus: var(--primary);
    --shadow-sm: 0 2px 8px hsla(220, 30%, 50%, 0.08);
    --shadow-md: 0 4px 20px hsla(220, 30%, 50%, 0.12);
    --shadow-lg: 0 8px 40px hsla(220, 30%, 50%, 0.15);
    --shadow-glow: 0 0 30px hsla(var(--primary-hue), 80%, 50%, 0.2);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

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

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Subtle gradient background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 20% 20%, hsla(var(--primary-hue), 70%, 85%, 0.3) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, hsla(165, 70%, 85%, 0.25) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 100%, hsla(280, 60%, 90%, 0.2) 0%, transparent 40%);
    pointer-events: none;
    z-index: 0;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-primary);
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

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

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

/* Forms */
input,
select,
textarea {
    font-family: inherit;
    font-size: 1rem;
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    transition: all var(--transition-fast);
    width: 100%;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px hsla(var(--primary-hue), 80%, 50%, 0.2);
}

input::placeholder {
    color: var(--text-muted);
}

label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-sm), 0 0 20px hsla(var(--primary-hue), 80%, 50%, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), 0 0 30px hsla(var(--primary-hue), 80%, 50%, 0.4);
}

.btn-secondary {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-subtle);
}

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

.btn-success {
    background: linear-gradient(135deg, var(--success), hsl(145, 80%, 40%));
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger), var(--danger-dark));
    color: white;
}

.btn-sm {
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.85rem;
}

.btn-lg {
    padding: var(--space-md) var(--space-xl);
    font-size: 1.1rem;
}

.btn-xs {
    padding: 0.2rem 0.4rem;
    font-size: 0.75rem;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Cards */
.card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-md);
}

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

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Toggle / Switch */
.toggle {
    position: relative;
    width: 52px;
    height: 28px;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.toggle-slider::before {
    position: absolute;
    content: '';
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background: var(--text-muted);
    border-radius: 50%;
    transition: all var(--transition-base);
}

.toggle input:checked+.toggle-slider {
    background: var(--success);
    border-color: var(--success);
}

.toggle input:checked+.toggle-slider::before {
    transform: translateX(24px);
    background: white;
}

/* Absent toggle - red when checked */
.toggle-absent input:checked+.toggle-slider {
    background: var(--danger);
}

.attendance-label.absent {
    color: var(--danger);
    font-weight: 600;
}

/* Alert styles */
.alert {
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 0.5rem;
}

.alert-success {
    background: rgba(46, 204, 113, 0.2);
    color: #27ae60;
    border: 1px solid rgba(46, 204, 113, 0.3);
}

.alert-warning {
    background: rgba(241, 196, 15, 0.2);
    color: #f39c12;
    border: 1px solid rgba(241, 196, 15, 0.3);
}

.alert ul {
    padding-left: 1.5rem;
    margin: 0;
}

/* Tables */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--glass-border);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

th,
td {
    padding: var(--space-md);
    text-align: left;
    border-bottom: 1px solid var(--border-subtle);
}

th {
    background: var(--bg-elevated);
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
}

tr:hover td {
    background: var(--bg-hover);
}

tr:last-child td {
    border-bottom: none;
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.badge-success {
    background: hsla(145, 80%, 50%, 0.2);
    color: var(--success);
}

.badge-danger {
    background: hsla(0, 84%, 60%, 0.2);
    color: var(--danger);
}

.badge-warning {
    background: hsla(45, 100%, 55%, 0.2);
    color: var(--warning);
}

.badge-info {
    background: hsla(var(--primary-hue), 80%, 50%, 0.2);
    color: var(--primary-light);
}

/* Progress Bar */
.progress {
    height: 8px;
    background: var(--bg-elevated);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

.progress-bar.success {
    background: linear-gradient(90deg, var(--success), hsl(145, 80%, 60%));
}

.progress-bar.warning {
    background: linear-gradient(90deg, var(--warning), hsl(30, 100%, 55%));
}

.progress-bar.danger {
    background: linear-gradient(90deg, var(--danger), hsl(0, 84%, 50%));
}

/* Percentage Display */
.percentage {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: var(--font-mono);
}

.percentage.high {
    color: var(--success);
}

.percentage.medium {
    color: var(--warning);
}

.percentage.low {
    color: var(--danger);
}

/* Select Dropdown */
.select-wrapper {
    position: relative;
}

.select-wrapper::after {
    content: '▼';
    position: absolute;
    right: var(--space-md);
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.7rem;
    color: var(--text-muted);
    pointer-events: none;
}

select {
    appearance: none;
    padding-right: 2.5rem;
    cursor: pointer;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: hsla(0, 0%, 0%, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--bg-surface);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    transform: scale(0.9) translateY(20px);
    transition: transform var(--transition-base);
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
}

/* Notifications */
.toast {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-surface);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 2000;
    transform: translateX(120%);
    transition: transform var(--transition-base);
}

.toast.show {
    transform: translateX(0);
}

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

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

/* Loading Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-subtle);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Utility Classes */
.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

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

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-sm {
    gap: var(--space-sm);
}

.gap-md {
    gap: var(--space-md);
}

.gap-lg {
    gap: var(--space-lg);
}

.w-full {
    width: 100%;
}

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

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

.text-muted {
    color: var(--text-muted);
}

.text-sm {
    font-size: 0.875rem;
}

.font-mono {
    font-family: var(--font-mono);
}

.mt-sm {
    margin-top: var(--space-sm);
}

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

.mt-lg {
    margin-top: var(--space-lg);
}

.mb-sm {
    margin-bottom: var(--space-sm);
}

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

.mb-lg {
    margin-bottom: var(--space-lg);
}

.hidden {
    display: none !important;
}

/* Sessions History Grid */
.sessions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--space-sm);
}

.session-card {
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: var(--space-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    text-align: center;
}

.session-card:hover {
    background: var(--bg-hover);
    border-color: var(--primary);
    transform: translateY(-2px);
}

.session-card-date {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.session-card-hours {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.session-delete-btn {
    position: absolute;
    top: 2px;
    right: 2px;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.session-card:hover .session-delete-btn {
    opacity: 1;
}

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

/* Responsive */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

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