/**
 * Smart RFID Attendance System — Design System & Custom CSS
 * Theme: White & Blue Modern Premium Dashboard
 */

:root {
    --bg-page: #f8fafc;
    --bg-card: #ffffff;
    --bg-card-hover: #f1f5f9;
    --border-subtle: #e2e8f0;
    --border-strong: #cbd5e1;
    
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --primary-border: #bfdbfe;
    --primary-dark: #1e40af;
    
    --navy-900: #0f172a;
    --navy-800: #1e293b;
    --navy-700: #334155;
    --navy-600: #475569;
    --text-muted: #64748b;
    
    --success: #10b981;
    --success-light: #ecfdf5;
    --success-border: #a7f3d0;
    --success-text: #065f46;
    
    --warning: #f59e0b;
    --warning-light: #fffbeb;
    --warning-border: #fde68a;
    --warning-text: #92400e;
    
    --danger: #ef4444;
    --danger-light: #fef2f2;
    --danger-border: #fecaca;
    --danger-text: #991b1b;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    background-color: var(--bg-page);
    color: var(--navy-800);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background: #ffffff;
    border-right: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    position: sticky;
    top: 0;
    height: 100vh;
    z-index: 40;
}

.brand {
    padding: 24px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border-subtle);
}

.brand-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    font-weight: 700;
    font-size: 1.25rem;
    box-shadow: 0 4px 10px rgba(37, 99, 235, 0.35);
}

.brand-text h1 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--navy-900);
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.brand-text span {
    font-size: 0.72rem;
    text-transform: uppercase;
    font-weight: 600;
    color: var(--primary);
    letter-spacing: 0.05em;
}

.nav-menu {
    padding: 16px 12px;
    list-style: none;
    flex: 1;
    overflow-y: auto;
}

.nav-label {
    font-size: 0.68rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 12px 12px 6px 12px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    border-radius: var(--radius-md);
    color: var(--navy-700);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.92rem;
    transition: all 0.15s ease-in-out;
    margin-bottom: 3px;
}

.nav-link:hover {
    background-color: var(--primary-light);
    color: var(--primary);
}

.nav-link.active {
    background-color: var(--primary-light);
    color: var(--primary);
    font-weight: 600;
    box-shadow: inset 3px 0 0 var(--primary);
}

.nav-link svg {
    width: 20px;
    height: 20px;
    stroke-width: 1.8;
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #fafafa;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 10px;
}

.avatar {
    width: 36px;
    height: 36px;
    background: #e2e8f0;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: var(--navy-800);
    font-size: 0.85rem;
}

.user-info .user-name {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--navy-900);
    line-height: 1.2;
}

.user-info .user-role {
    font-size: 0.72rem;
    color: var(--text-muted);
}

/* Main Content Area */
.main-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.top-bar {
    height: 70px;
    background: #ffffff;
    border-bottom: 1px solid var(--border-subtle);
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 30;
}

.page-title h2 {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--navy-900);
    letter-spacing: -0.02em;
}

.top-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.live-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: var(--success-light);
    border: 1px solid var(--success-border);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--success-text);
}

.live-dot {
    width: 8px;
    height: 8px;
    background-color: var(--success);
    border-radius: 50%;
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
    }
    70% {
        transform: scale(1);
        box-shadow: 0 0 0 6px rgba(16, 185, 129, 0);
    }
    100% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
    }
}

.content-body {
    padding: 32px;
    flex: 1;
}

/* KPI Cards Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 28px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 22px;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s, box-shadow 0.2s;
}

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

.stat-label {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 6px;
}

.stat-val {
    font-size: 2rem;
    font-weight: 800;
    color: var(--navy-900);
    line-height: 1.1;
}

.stat-subtext {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 6px;
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-blue { background: var(--primary-light); color: var(--primary); }
.icon-green { background: var(--success-light); color: var(--success); }
.icon-amber { background: var(--warning-light); color: var(--warning); }
.icon-purple { background: #f3e8ff; color: #7e22ce; }

/* Dashboard Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: 24px;
    overflow: hidden;
}

.card-header {
    padding: 18px 24px;
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--navy-900);
}

.card-body {
    padding: 24px;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    text-align: left;
}

.data-table th {
    background: #f8fafc;
    color: var(--navy-600);
    font-weight: 600;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 12px 18px;
    border-bottom: 1px solid var(--border-subtle);
}

.data-table td {
    padding: 14px 18px;
    border-bottom: 1px solid var(--border-subtle);
    color: var(--navy-800);
    vertical-align: middle;
}

.data-table tbody tr:hover {
    background-color: #f8fafc;
}

/* Status Badges */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 10px;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.badge-present, .badge-success {
    background: var(--success-light);
    color: var(--success-text);
    border: 1px solid var(--success-border);
}

.badge-duplicate, .badge-warning {
    background: var(--warning-light);
    color: var(--warning-text);
    border: 1px solid var(--warning-border);
}

.badge-unknown, .badge-danger, .badge-error {
    background: var(--danger-light);
    color: var(--danger-text);
    border: 1px solid var(--danger-border);
}

.badge-info, .badge-blue {
    background: var(--primary-light);
    color: var(--primary-dark);
    border: 1px solid var(--primary-border);
}

.badge-muted {
    background: #f1f5f9;
    color: var(--navy-600);
    border: 1px solid var(--border-subtle);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 18px;
    font-size: 0.88rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    text-decoration: none;
    transition: all 0.15s ease-in-out;
    border: 1px solid transparent;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.btn-secondary {
    background-color: #ffffff;
    border-color: var(--border-strong);
    color: var(--navy-700);
}

.btn-secondary:hover {
    background-color: #f8fafc;
    border-color: var(--text-muted);
}

.btn-success {
    background-color: var(--success);
    color: #ffffff;
}

.btn-success:hover {
    background-color: #059669;
}

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

.btn-sm {
    padding: 5px 12px;
    font-size: 0.8rem;
}

/* Form Controls */
.form-group {
    margin-bottom: 18px;
}

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--navy-700);
    margin-bottom: 6px;
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    font-size: 0.92rem;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    background: #ffffff;
    color: var(--navy-800);
    transition: border-color 0.15s, box-shadow 0.15s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

/* Code UID chip */
.uid-chip {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    background: #f1f5f9;
    padding: 3px 8px;
    border-radius: 4px;
    border: 1px solid var(--border-subtle);
    color: var(--navy-800);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.05em;
}

/* Modal */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(4px);
    z-index: 100;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: #ffffff;
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 520px;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    animation: modalSlide 0.25s ease-out;
}

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

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--navy-900);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 16px 24px;
    background: #f8fafc;
    border-top: 1px solid var(--border-subtle);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* Card Tap Scanner Animation */
.tap-sensor-box {
    text-align: center;
    padding: 32px 20px;
    background: linear-gradient(180deg, #f8fafc 0%, #eff6ff 100%);
    border: 2px dashed var(--primary-border);
    border-radius: var(--radius-lg);
    margin: 20px 0;
}

.sensor-wave {
    width: 80px;
    height: 80px;
    margin: 0 auto 16px;
    background: var(--primary-light);
    border: 2px solid var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    animation: wavePulse 1.8s infinite;
}

@keyframes wavePulse {
    0% { transform: scale(0.9); box-shadow: 0 0 0 0 rgba(37, 99, 235, 0.4); }
    70% { transform: scale(1.05); box-shadow: 0 0 0 16px rgba(37, 99, 235, 0); }
    100% { transform: scale(0.9); box-shadow: 0 0 0 0 rgba(37, 99, 235, 0); }
}

/* Responsive */
@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
    }
    .top-bar {
        padding: 0 16px;
    }
    .content-body {
        padding: 16px;
    }
}