/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f5f5f5;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.container-small {
    max-width: 500px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: #2c3e50;
    color: white;
    padding: 1rem 0;
    margin-bottom: 2rem;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    font-size: 1.5rem;
}

header nav a {
    color: white;
    text-decoration: none;
    margin-left: 1.5rem;
}

header nav a:hover {
    text-decoration: underline;
}

/* Cards */
.card {
    background: white;
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.card h2 {
    margin-bottom: 1rem;
    color: #2c3e50;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #555;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="url"],
.form-group input[type="number"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3498db;
}

.form-group.error input,
.form-group.error select,
.form-group.error textarea {
    border-color: #e74c3c;
}

.form-error {
    color: #e74c3c;
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.form-group small {
    display: block;
    margin-top: 0.25rem;
    color: #777;
    font-size: 0.875rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: #3498db;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    font-size: 1rem;
    transition: background 0.2s;
}

.btn:hover {
    background: #2980b9;
}

.btn-secondary {
    background: #95a5a6;
}

.btn-secondary:hover {
    background: #7f8c8d;
}

.btn-danger {
    background: #e74c3c;
}

.btn-danger:hover {
    background: #c0392b;
}

.btn-success {
    background: #27ae60;
}

.btn-success:hover {
    background: #229954;
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 1.5rem;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

/* Table */
table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

table th,
table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

table th {
    background: #f8f9fa;
    font-weight: 600;
    color: #555;
}

table tr:hover {
    background: #f8f9fa;
}

/* Status badges */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-success {
    background: #d4edda;
    color: #155724;
}

.badge-danger {
    background: #f8d7da;
    color: #721c24;
}

.badge-warning {
    background: #fff3cd;
    color: #856404;
}

.badge-info {
    background: #d1ecf1;
    color: #0c5460;
}

.badge-secondary {
    background: #e9ecef;
    color: #6c757d;
}

/* Utility */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }

.d-flex {
    display: flex;
}

.justify-between {
    justify-content: space-between;
}

.align-center {
    align-items: center;
}

.gap-1 {
    gap: 1rem;
}

/* Responsive Design - Mobile */
@media (max-width: 768px) {
    /* Container */
    .container {
        padding: 0 15px;
    }

    /* Header */
    header .container {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    header h1 {
        font-size: 1.25rem;
    }

    header nav {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.5rem;
    }

    header nav a {
        margin-left: 0;
        font-size: 0.875rem;
    }

    header nav form {
        width: 100%;
        margin-top: 0.5rem;
    }

    /* Cards */
    .card {
        padding: 1rem;
        margin-bottom: 1rem;
    }

    .card h2 {
        font-size: 1.25rem;
    }

    /* Stats cards - stack on mobile */
    .d-flex.gap-1 {
        flex-direction: column;
        gap: 0.5rem;
    }

    .d-flex.gap-1 .card {
        margin-bottom: 0;
    }

    /* Buttons */
    .btn {
        padding: 0.625rem 1rem;
        font-size: 0.875rem;
        display: block;
        width: 100%;
        text-align: center;
    }

    .btn-small {
        padding: 0.5rem 0.75rem;
        font-size: 0.75rem;
        display: inline-block;
        width: auto;
    }

    /* Tables - make scrollable */
    .card {
        overflow-x: auto;
    }

    table {
        min-width: 800px;
        font-size: 0.875rem;
    }

    table th,
    table td {
        padding: 0.5rem;
        white-space: nowrap;
    }

    /* Forms */
    .form-group input[type="text"],
    .form-group input[type="email"],
    .form-group input[type="password"],
    .form-group input[type="url"],
    .form-group input[type="number"],
    .form-group select,
    .form-group textarea {
        font-size: 16px; /* Prevents zoom on iOS */
    }

    /* Flex utilities on mobile */
    .d-flex.justify-between {
        flex-direction: column;
        gap: 1rem;
    }

    .d-flex.justify-between.align-center {
        align-items: flex-start;
    }

    /* Checkboxes and labels */
    .form-group label {
        font-size: 0.9rem;
    }

    /* Headings */
    h1 {
        font-size: 1.5rem;
    }

    h2 {
        font-size: 1.25rem;
    }

    h3 {
        font-size: 1.1rem;
    }
}

@media (max-width: 480px) {
    /* Extra small screens */
    .container {
        padding: 0 10px;
    }

    .card {
        padding: 0.75rem;
        border-radius: 4px;
    }

    header nav a {
        font-size: 0.8rem;
    }

    table {
        min-width: 600px;
        font-size: 0.75rem;
    }

    .badge {
        font-size: 0.7rem;
        padding: 0.2rem 0.5rem;
    }
}