:root {
    --primary: #0066cc;
    --primary-dark: #004a99;
    --background: #f5f6fa;
    --text: #2d3436;
    --border: #dfe6e9;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #eef2ff 0%, #f8fbff 100%);
    color: var(--text);
}

.app-header {
    background: var(--primary);
    color: #fff;
    padding: 1.5rem;
}

.app-header h1 {
    margin: 0 0 1rem 0;
    font-size: 1.6rem;
}

.app-header nav {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    align-items: center;
}

.app-header nav a {
    color: #fff;
    text-decoration: none;
    font-weight: 600;
    padding: 0.4rem 0.8rem;
    border-radius: 0.4rem;
    transition: background 0.2s ease;
    background: rgba(255, 255, 255, 0.15);
}

.app-header nav a:hover {
    background: rgba(0, 0, 0, 0.2);
}

.nav-user {
    font-weight: 600;
    background: rgba(255, 255, 255, 0.12);
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
}

.app-content {
    padding: 2rem;
    max-width: 1100px;
    margin: 0 auto;
}

.card {
    background: #fff;
    border-radius: 0.8rem;
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.08);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.card h2 {
    margin-top: 0;
}

.hero-card {
    background: linear-gradient(135deg, #0066cc, #003d82);
    color: #fff;
    padding: 2.2rem;
    display: grid;
    gap: 1rem;
}

.hero-card h2 {
    font-size: 2rem;
    margin: 0;
}

.hero-card p {
    margin: 0;
    color: rgba(255, 255, 255, 0.85);
}

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-actions .btn {
    background: rgba(255, 255, 255, 0.18);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: #fff;
}

.hero-actions .btn:hover {
    background: rgba(255, 255, 255, 0.28);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
    gap: 1rem;
}

.stat-card {
    background: #f7f9ff;
    border-radius: 0.8rem;
    padding: 1.2rem;
    border: 1px solid rgba(0, 102, 204, 0.12);
    display: flex;
    gap: 1rem;
    align-items: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 102, 204, 0.12);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 16px;
    background: rgba(0, 102, 204, 0.12);
    display: grid;
    place-items: center;
    font-size: 1.6rem;
    color: var(--primary);
}

.stat-label {
    margin: 0;
    font-size: 0.9rem;
    color: #6c7a89;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    margin: 0.3rem 0 0 0;
    font-size: 2rem;
    font-weight: 700;
    color: #1f2d3d;
}

.stat-sub {
    margin: 0.2rem 0 0 0;
    font-size: 0.85rem;
    color: #95a5a6;
}

form {
    display: grid;
    gap: 1rem;
}

form label {
    font-weight: 600;
}

input[type="text"], select, textarea {
    padding: 0.6rem 0.8rem;
    border-radius: 0.4rem;
    border: 1px solid var(--border);
    font-size: 1rem;
    width: 100%;
}

button, .btn {
    display: inline-block;
    border: none;
    background: var(--primary);
    color: #fff;
    padding: 0.6rem 1.2rem;
    font-size: 1rem;
    border-radius: 0.4rem;
    cursor: pointer;
    transition: background 0.2s ease;
}

button:hover, .btn:hover {
    background: var(--primary-dark);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

th, td {
    padding: 0.8rem;
    border-bottom: 1px solid var(--border);
    text-align: left;
}

th {
    background: #ecf0f1;
}

tbody tr:hover {
    background: rgba(0, 102, 204, 0.06);
}

.status-badge {
    display: inline-block;
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: capitalize;
}

.status-present {
    background: #d4efdf;
    color: #1d8348;
}

.status-late {
    background: #fdebd0;
    color: #af601a;
}

.qr-image {
    width: 160px;
    height: 160px;
    object-fit: contain;
    border: 1px solid var(--border);
    border-radius: 0.4rem;
    padding: 0.4rem;
    background: #fff;
}

.table-actions {
    display: flex;
    gap: 0.5rem;
}

.alert {
    padding: 0.75rem 1rem;
    border-radius: 0.4rem;
    margin-bottom: 1rem;
}

.alert-success {
    background: #d1f2eb;
    color: #0e6655;
}

.alert-error {
    background: #fadbd8;
    color: #922b21;
}

.app-footer {
    text-align: center;
    padding: 1rem;
    background: #fff;
    border-top: 1px solid var(--border);
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.filter-form {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.filter-form input[type="date"] {
    width: auto;
}

.filter-actions {
    display: flex;
    gap: 0.6rem;
    align-items: flex-end;
}

.stacked-form {
    margin-bottom: 1rem;
}

.quick-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 1rem;
}

.quick-action {
    border: 1px dashed rgba(0, 102, 204, 0.15);
    border-radius: 0.8rem;
    padding: 1.1rem;
    display: grid;
    gap: 0.45rem;
    transition: border 0.2s ease, transform 0.2s ease;
    background: #fff;
    text-decoration: none;
    color: inherit;
}

.quick-action:hover {
    border: 1px solid rgba(0, 102, 204, 0.4);
    transform: translateY(-3px);
}

.quick-action span {
    font-size: 1.5rem;
}

.quick-action strong {
    font-size: 1rem;
    color: #1f2d3d;
}

.quick-action p {
    margin: 0;
    font-size: 0.9rem;
    color: #6c7a89;
}

.role-badge {
    display: inline-block;
    padding: 0.3rem 0.7rem;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
}

.role-admin {
    background: rgba(0, 102, 204, 0.15);
    color: var(--primary);
}

.role-homeroom {
    background: rgba(46, 204, 113, 0.18);
    color: #1d8348;
}

.role-monitor {
    background: rgba(241, 196, 15, 0.2);
    color: #af601a;
}

.role-info {
    background: rgba(127, 140, 141, 0.2);
    color: #34495e;
}

.notification-list {
    display: grid;
    gap: 0.75rem;
    margin-top: 1rem;
}

.notification-item {
    background: #fff7f2;
    border: 1px solid rgba(255, 145, 0, 0.2);
    border-radius: 0.6rem;
    padding: 0.9rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.notification-item strong {
    color: #af601a;
}

.notification-meta {
    display: flex;
    gap: 1.5rem;
    font-size: 0.9rem;
    color: #7f8c8d;
}

.login-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background: linear-gradient(135deg, #eef2ff 0%, #f8fbff 100%);
}

.login-card {
    width: min(360px, 100%);
    background: #fff;
    border-radius: 1rem;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.12);
    padding: 2rem;
    display: grid;
    gap: 1.2rem;
}

.login-card h1 {
    margin: 0;
    font-size: 1.6rem;
    text-align: center;
}

.login-card p {
    margin: 0;
    text-align: center;
    color: #6c7a89;
}

.login-card form {
    display: grid;
    gap: 1rem;
}

.login-card button {
    width: 100%;
}

.login-footer {
    text-align: center;
    font-size: 0.9rem;
    color: #7f8c8d;
}

@media (max-width: 768px) {
    .app-content {
        padding: 1.5rem;
    }

    .app-header nav {
        flex-direction: column;
        align-items: flex-start;
    }

    .filter-form {
        flex-direction: column;
        align-items: flex-start;
    }
}