:root {
    /* MODO CLARO */
    --bg-color: #f4f6f8;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --primary-color: #0f172a;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --danger-color: #ef4444;
    --success-color: #10b981;
    --border-color: #e2e8f0;
    --sidebar-bg: #ffffff;
    --sidebar-item-active: #f1f5f9;
}

[data-theme="dark"] {
    /* MODO OSCURO */
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --primary-color: #f8fafc;
    --accent-color: #3b82f6;
    --accent-hover: #60a5fa;
    --danger-color: #ef4444;
    --success-color: #34d399;
    --border-color: #334155;
    --sidebar-bg: #1e293b;
    --sidebar-item-active: #334155;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    transition: background-color 0.3s, color 0.3s;
}

/* UTILIDADES ESTRUCTURALES */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.auth-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    padding: 40px;
    width: 100%;
    max-width: 400px;
}

.auth-card h1 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
    text-align: center;
}

.auth-card p.subtitle {
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 24px;
    font-size: 14px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.form-control {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-size: 14px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.btn {
    display: inline-block;
    width: 100%;
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 500;
    text-align: center;
    border-radius: 6px;
    cursor: pointer;
    border: none;
    transition: background-color 0.2s;
}

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

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

.alert {
    padding: 10px 14px;
    border-radius: 6px;
    margin-bottom: 16px;
    font-size: 14px;
}

.alert-danger {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.alert-success {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.auth-footer {
    margin-top: 24px;
    text-align: center;
    font-size: 14px;
    color: var(--text-secondary);
}

.auth-footer a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
}

.auth-footer a:hover {
    text-decoration: underline;
}

.theme-toggle-btn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    color: var(--text-primary);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}