:root {
    --primary-color: #00B4D8;
    /* Celeste Vibrante */
    --secondary-color: #90E0EF;
    --background-color: #CAF0F8;
    /* Celeste muy suave para fondo */
    --card-bg: #ffffff;
    --text-color: #03045E;
    /* Azul oscuro para texto */
    --danger: #FF6B6B;
    --success: #4ECDC4;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--background-color);
    color: var(--text-color);
}

.tab-nav {
    display: flex;
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    padding: 0 10px;
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
}

.tab-nav::-webkit-scrollbar {
    display: none; /* Hide scrollbar for cleaner look on mobile */
}

.tab-btn {
    padding: 15px 20px;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    color: #666;
    border-bottom: 3px solid transparent;
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom: 3px solid var(--primary-color);
}

.tab-content {
    display: none;
    padding: 20px;
    max-width: 800px;
    margin: 0 auto;
}

.tab-content.active {
    display: block;
    flex: 1;
    /* Causes the content to grow and push footer down */
}

.card {
    background: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    padding: 20px;
    margin-bottom: 20px;
}

.input-field {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    width: 100%;
    font-size: 16px;
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    width: 100%;
    font-size: 16px;
}

.btn-small {
    padding: 5px 10px;
    font-size: 12px;
    cursor: pointer;
    border-radius: 4px;
    border: none;
}

.scanner-container {
    padding: 20px;
    text-align: center;
}

#reader {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    border-radius: 8px;
    overflow: hidden;
}

.history-item {
    padding: 10px;
    border-bottom: 1px solid #eee;
    font-size: 14px;
}

.row {
    display: flex;
    gap: 15px;
    /* Adds nice spacing between columns */
    align-items: flex-end;
    /* Aligns buttons with inputs nicely */
}

.form-group {
    flex: 1;
    /* Ensures they take equal space in a row */
    margin-bottom: 15px;
}


/* Toast Notification */
#toast {
    visibility: hidden;
    min-width: 250px;
    background-color: #333;
    color: #fff;
    text-align: center;
    border-radius: 2px;
    padding: 16px;
    position: fixed;
    z-index: 100;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 17px;
}

#toast.show {
    visibility: visible;
    -webkit-animation: fadein 0.5s, fadeout 0.5s 2.5s;
    animation: fadein 0.5s, fadeout 0.5s 2.5s;
}

/* Toast Types */
#toast.success {
    background-color: var(--success);
}

#toast.error {
    background-color: var(--danger);
}

#toast.info {
    background-color: #0288D1;
}

.school-logo {
    height: 60px;
    margin-right: 15px;
}

header {
    background: #fff;
    padding: 15px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* FIX: Sticky Footer & Full Height */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

footer {
    margin-top: auto;
    /* Pushes footer to bottom */
}

@keyframes fadein {
    from {
        bottom: 0;
        opacity: 0;
    }

    to {
        bottom: 30px;
        opacity: 1;
    }
}

@keyframes fadeout {
    from {
        bottom: 30px;
        opacity: 1;
    }

    to {
        bottom: 0;
        opacity: 0;
    }
}

/* WELCOME ANIMATION */
.animate-welcome {
    animation: popIn 0.8s cubic-bezier(0.68, -0.55, 0.27, 1.55) both;
}

@keyframes popIn {
    0% {
        opacity: 0;
        transform: scale(0.5) translateY(20px);
    }

    100% {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

/* PRINT STYLES */
/* History Table Styling */
/* History Table Styling (Shared) */
#attendanceTable,
#generatedTable {
    width: 100%;
    border-collapse: collapse;
    /* Ensure clean shared borders */
    font-size: 14px;
    margin-top: 10px;
}

#attendanceTable th,
#attendanceTable td,
#generatedTable th,
#generatedTable td {
    border: 1px solid #bbb;
    /* The "Squares" look */
    padding: 12px;
    /* Cells */
    text-align: left;
}

#attendanceTable th,
#generatedTable th {
    background-color: #f0f0f0;
    font-weight: 600;
    color: #333;
    border-bottom: 2px solid #aaa;
}

#attendanceTable tbody tr:nth-child(even),
#generatedTable tbody tr:nth-child(even) {
    background-color: #f9f9f9;
}

#attendanceTable tbody tr:hover,
#generatedTable tbody tr:hover {
    background-color: #e3f2fd;
}

/* PRINT STYLES */
@media print {
    body * {
        visibility: hidden;
    }

    #printableReport,
    #printableReport * {
        visibility: visible;
    }

    #printableReport {
        display: block !important;
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
    }

    /* Hide everything else explicitly if needed, but 'body * visibility: hidden' helps */
    #app-container,
    .no-print,
    #login-overlay {
        display: none !important;
    }
}