:root {
    --primary-color: #2196F3;
    --primary-dark: #1976D2;
    --secondary-color: #607D8B;
    --success-color: #4CAF50;
    --warning-color: #FF9800;
    --danger-color: #dc3545;
    --text-color: #333;
    --text-light: #666;
    --bg-color: #f4f4f9;
    --card-bg: #fff;
    --border-color: #ddd;
    --spacing-sm: 10px;
    --spacing-md: 20px;
    --spacing-lg: 30px;
    --radius: 8px;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Reset & Base */
* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
    margin-top: 0;
    color: var(--text-color);
}

h1 { font-size: 1.8rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.2rem; }

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

/* Layout */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* Components */
.card {
    background: var(--card-bg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: transform 0.2s ease;
}

.header-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

/* Forms */
.form-group {
    margin-bottom: 15px;
}

.form-row {
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-end;
    flex-wrap: wrap;
}

.form-row .form-group {
    flex: 1;
    min-width: 200px; /* Ensure inputs don't get too small */
}

label {
    display: block;
    margin-bottom: 5px;
    color: var(--text-light);
    font-weight: 500;
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="number"],
input[type="password"],
select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 16px; /* Prevents zoom on iOS */
    transition: border-color 0.3s;
}

input:focus, select:focus {
    border-color: var(--primary-color);
    outline: none;
}

/* Buttons */
.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    text-align: center;
    transition: background-color 0.3s;
    font-weight: 600;
}

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

.btn-secondary {
    background-color: var(--secondary-color);
}
.btn-secondary:hover { background-color: #546E7A; }

.btn-danger {
    background-color: var(--danger-color);
}
.btn-danger:hover { background-color: #c82333; }

.btn-warning {
    background-color: var(--warning-color);
    color: white;
}
.btn-warning:hover { background-color: #F57C00; }

.btn-small {
    padding: 6px 12px;
    font-size: 14px;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-top: var(--spacing-sm);
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px; /* Force scroll on small screens */
}

th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: #f8f9fa;
    font-weight: 600;
    color: var(--text-color);
    white-space: nowrap;
}

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

/* Alerts */
.alert {
    padding: 15px;
    border-radius: 4px;
    margin-bottom: var(--spacing-md);
    border-left: 5px solid transparent;
}

.alert-success {
    background-color: #e8f5e9;
    color: #2e7d32;
    border-left-color: #2e7d32;
}

.alert-error, .alert-danger {
    background-color: #ffebee;
    color: #c62828;
    border-left-color: #c62828;
}

.alert-info {
    background-color: #e3f2fd;
    color: #0d47a1;
    border-left-color: #0d47a1;
}

/* Utility */
.d-flex { display: flex; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-10 { gap: 10px; }
.mt-20 { margin-top: 20px; }
.text-center { text-align: center; }
.w-100 { width: 100%; }

/* Grid Layouts */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.stat-item {
    background: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: var(--radius);
    text-align: center;
    box-shadow: var(--shadow);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 10px 0;
}

/* Language Switcher */
.lang-switch a {
    padding: 5px 10px;
    border-radius: 20px;
    font-weight: 600;
    color: var(--text-light);
}

.lang-switch a.active {
    background-color: var(--primary-color);
    color: white;
}

/* Auth Pages */
.auth-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: var(--spacing-md);
}

.auth-container {
    width: 100%;
    max-width: 400px;
    background: var(--card-bg);
    padding: var(--spacing-lg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

/* Legend */
.legend {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--bg-color);
    border-radius: var(--radius);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9em;
}

.dot {
    width: 15px;
    height: 15px;
    border-radius: 3px;
}

.dot-manual { background-color: var(--success-color); }
.dot-auto { background-color: var(--warning-color); }
.dot-free { background-color: #fff; border: 1px solid var(--border-color); }

/* Schedule Table Specifics */
.cell-manual {
    background-color: var(--success-color);
    color: white;
    font-weight: bold;
}

.cell-auto {
    background-color: var(--warning-color);
    color: white;
    font-weight: bold;
}

.cell-empty {
    background-color: #fff;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    body {
        padding: 10px;
        background-color: #f0f2f5;
    }

    .container {
        padding: 0;
    }
    
    .card {
        border-radius: 0; /* Full width cards look better on mobile */
        box-shadow: none;
        border-bottom: 1px solid var(--border-color);
        margin-bottom: 10px;
    }
    
    /* On very small screens, round corners back if margin exists */
    .container > .card {
        border-radius: var(--radius);
        box-shadow: var(--shadow);
    }

    .header-flex {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .header-flex > div {
        width: 100%;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    .form-row {
        flex-direction: column;
        align-items: stretch;
    }

    .grid-2 {
        grid-template-columns: 1fr; /* Stack checkboxes */
    }

    h1 { font-size: 1.5rem; }
    
    .btn {
        width: 100%; /* Full width buttons on mobile */
        margin-bottom: 10px;
    }
    
    .btn-small {
        width: auto;
        margin-bottom: 0;
    }
}