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

:root {
    --primary: #667eea;
    --primary-dark: #764ba2;
    --success: #4caf50;
    --error: #f44336;
    --warning: #ff9800;
    --light: #f5f5f5;
    --dark: #333;
    --border: #ddd;
}

html {
    font-size: 16px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--dark);
    background: #fafafa;
}

body {
    line-height: 1.6;
}

#app {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 250px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 20px;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar h1 {
    font-size: 20px;
    margin-bottom: 30px;
}

.sidebar nav a {
    display: block;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    padding: 12px 15px;
    margin-bottom: 8px;
    border-radius: 6px;
    transition: all 0.3s;
}

.sidebar nav a:hover,
.sidebar nav a.active {
    background: rgba(255,255,255,0.2);
    color: white;
}

/* Main Content */
.main-content {
    margin-left: 250px;
    flex: 1;
    padding: 30px;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.header h1 {
    font-size: 28px;
    color: var(--dark);
}

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

.card h2 {
    font-size: 18px;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--light);
}

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

table th {
    background: var(--light);
    padding: 12px;
    text-align: left;
    font-weight: 600;
    border-bottom: 2px solid var(--border);
}

table td {
    padding: 12px;
    border-bottom: 1px solid var(--border);
}

table tr:hover {
    background: #fafafa;
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark);
}

input,
select,
textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
}

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

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

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

.btn-danger {
    background: var(--error);
    color: white;
}

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

/* Alerts */
.alert {
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 6px;
    border-left: 4px solid;
}

.alert-success {
    background: #f1f8f5;
    color: var(--success);
    border-color: var(--success);
}

.alert-error {
    background: #fdf5f5;
    color: var(--error);
    border-color: var(--error);
}

.alert-info {
    background: #e3f2fd;
    color: #1565c0;
    border-color: #1565c0;
}

/* Status Badges */
.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success {
    background: rgba(76, 175, 80, 0.2);
    color: var(--success);
}

.badge-warning {
    background: rgba(255, 152, 0, 0.2);
    color: var(--warning);
}

.badge-error {
    background: rgba(244, 67, 54, 0.2);
    color: var(--error);
}

/* Loading */
.loading {
    text-align: center;
    padding: 40px;
}

.spinner {
    border: 4px solid var(--light);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        padding: 15px;
    }
    
    .main-content {
        margin-left: 0;
        padding: 15px;
    }
    
    .header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    table {
        font-size: 12px;
    }
    
    input, select, textarea {
        font-size: 16px; /* Para evitar zoom en iPhone */
    }
}