:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --secondary: #64748b;
    --secondary-hover: #475569;
    --success: #10b981;
    --success-hover: #059669;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --background: #f8fafc;
    --surface: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.05), 0 4px 6px -2px rgba(0,0,0,0.025);
    --transition: all 0.2s ease-in-out;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--background);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: var(--surface);
    color: var(--text-main);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid var(--border);
}

.header h1 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-main);
}

.container {
    margin: 2rem auto;
    padding: 2rem;
    max-width: 1200px;
    background-color: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-main);
}

h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-main);
}

.header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin-bottom: 2rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

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

th {
    background-color: #f1f5f9;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

td {
    background-color: var(--surface);
    font-size: 0.875rem;
}

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

tr:hover td {
    background-color: #f8fafc;
}

.btn {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 500;
    font-size: 0.875rem;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    gap: 0.5rem;
}

.btn:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}
.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: var(--shadow-sm);
}

.btn-success {
    background-color: var(--success);
    color: white;
}
.btn-success:hover {
    background-color: var(--success-hover);
    box-shadow: var(--shadow-sm);
}

.btn-danger {
    background-color: var(--danger);
    color: white;
}
.btn-danger:hover {
    background-color: var(--danger-hover);
    box-shadow: var(--shadow-sm);
}

.btn-secondary {
    background-color: var(--secondary);
    color: white;
}
.btn-secondary:hover {
    background-color: var(--secondary-hover);
    box-shadow: var(--shadow-sm);
}

input[type="text"],
input[type="number"],
input[type="date"],
select,
textarea,
.input-search {
    padding: 0.625rem 0.875rem;
    margin-bottom: 1rem;
    width: 100%;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: var(--text-main);
    background-color: var(--surface);
    transition: var(--transition);
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.input-search {
    max-width: 300px;
    margin: 0;
}

.footer {
    text-align: center;
    padding: 2rem 0;
    background-color: var(--surface);
    color: var(--text-muted);
    border-top: 1px solid var(--border);
    margin-top: 3rem;
    font-size: 0.875rem;
}

.footer-developer {
    color: var(--primary);
    font-weight: 600;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1050;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(4px);
    padding-top: 4rem;
}

.modal-content {
    background-color: var(--surface);
    margin: auto;
    padding: 2rem;
    border: none;
    width: 90%;
    max-width: 500px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    animation: modalSlideIn 0.3s ease-out;
}

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

.form-group {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}
.form-group input,
.form-group select {
    margin-bottom: 0;
    flex: 1 1 calc(50% - 0.5rem);
}

.btn-group {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    width: 100%;
    margin-top: 1rem;
}

.mt-20 {
    margin-top: 2rem;
}

#site-pagination, #material-pagination, #pagination-controls, #attendance-pagination-controls, #payment-pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin: 1.5rem 0;
}

#site-pagination button, #material-pagination button, #pagination-controls button, #attendance-pagination-controls button, #payment-pagination button {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    border-radius: var(--radius-sm);
    background-color: var(--surface);
    color: var(--text-main);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: var(--transition);
}

#site-pagination button:hover, #material-pagination button:hover, #pagination-controls button:hover, #attendance-pagination-controls button:hover, #payment-pagination button:hover {
    background-color: #f1f5f9;
    border-color: #cbd5e1;
}

/* Dashboard specific cards */
.card-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    padding: 1rem 0;
}

.card {
    background-color: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.card:hover, .card:focus-visible {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.card:focus-visible {
    outline: 3px solid rgba(79, 70, 229, 0.5);
    outline-offset: 2px;
}

.card img {
    width: 100%;
    height: 160px;
    border-radius: var(--radius-md);
    object-fit: cover;
    margin-bottom: 1.5rem;
}

.card h3 {
    margin: 0 0 0.5rem 0;
    color: var(--text-main);
}

.card p {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 0;
    flex-grow: 1;
}

.welcome-message {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--text-main);
    margin: 1rem 0 2rem;
    text-align: left;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.username {
    font-weight: 500;
    color: var(--text-main);
}

/* Additional Custom Gradient and UI Details for Dashboard */
.header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
    color: white;
    border-bottom: none;
}
.header h1, .header .username {
    color: white;
}

.welcome-message {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-main);
    text-align: center;
    margin-bottom: 3rem;
}

/* Give buttons in header an outline style */
.header .btn-danger {
    background: transparent;
    border: 1px solid rgba(255,255,255,0.5);
    color: white;
}
.header .btn-danger:hover {
    background: rgba(255,255,255,0.1);
    border-color: white;
}